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EP4605682A1 - Appareil d'éclairage de scène à base de phosphore laser fournissant une commande ctt - Google Patents

Appareil d'éclairage de scène à base de phosphore laser fournissant une commande ctt

Info

Publication number
EP4605682A1
EP4605682A1 EP23787135.5A EP23787135A EP4605682A1 EP 4605682 A1 EP4605682 A1 EP 4605682A1 EP 23787135 A EP23787135 A EP 23787135A EP 4605682 A1 EP4605682 A1 EP 4605682A1
Authority
EP
European Patent Office
Prior art keywords
light
polarization
pump light
pump
luminescent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23787135.5A
Other languages
German (de)
English (en)
Inventor
Ties Van Bommel
Rifat Ata Mustafa Hikmet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Signify Holding BV
Original Assignee
Signify Holding BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Signify Holding BV filed Critical Signify Holding BV
Publication of EP4605682A1 publication Critical patent/EP4605682A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising elements

Definitions

  • US2021156526A1 describes a light source device which includes a laser light source for emitting a first light, a refractive optical element disposed on a light exiting path of the laser light source and configured to guide the first light to a light conversion device.
  • the refractive optical element includes a light-exiting surface and light refracted by the lightexiting surface of the refractive optical element is deflected towards the light conversion device to exit.
  • the light conversion device is disposed at a light-exiting side of the refractive optical element and the incident surface and light-exiting surface thereof are the same surface.
  • the medium of the incident surface of the light conversion device has Brewster's angle of a and outgoing light of the refractive optical element is obliquely incident to the light conversion device at an incident angle of a-20° to a+10°.
  • the light collecting device is disposed at the light-exiting side of the light conversion device and configured to collect light emitted from the light conversion device and then emit it.
  • the present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.
  • the luminescent body may comprise a luminescent material.
  • the luminescent body may be configured to (a) transmit at least part of the pump light (comprising the first polarization and/or the second polarization) and (b) convert at least part of the pump light (comprising the first polarization and/or the second polarization) into luminescent material light.
  • the reflective polarizer may be configured downstream of the luminescent body.
  • the reflective polarizer may be transmissive for at least part of the luminescent material light. More especially, the reflective polarizer may have a higher transmission for the pump light comprising the first polarization than for the pump light comprising the second polarization.
  • high intensity white light may be provided.
  • the spectral distribution of the light provided by the light generating system may be controlled.
  • CCT correlated color temperature
  • the invention may provide in embodiments a laser-phosphor based stage-lighting fixture providing CCT control, and/or lighting for stage stadium lighting or transport infrastructure lighting.
  • the invention provides a light generating system comprising in embodiments a first light generating arrangement, a luminescent body, a reflective polarizer, and a control system.
  • a light generating system comprising in embodiments a first light generating arrangement, a luminescent body, a reflective polarizer, and a control system.
  • the first light generating arrangement may in embodiments comprise a light source, especially a solid state light source.
  • the term “light source” may in principle relate to any light source known in the art. It may be a conventional (tungsten) light bulb, a low pressure mercury lamp, a high pressure mercury lamp, a fluorescent lamp, an LED (light emissive diode).
  • the light source comprises a solid state LED light source (such as an LED or laser diode (or “diode laser”)).
  • the term “light source” may also relate to a plurality of light sources, such as 2-2000 (solid state) LED light sources. Hence, the term LED may also refer to a plurality of LEDs.
  • the term “light source” may also refer to a chip scaled package (CSP).
  • CSP chip scaled package
  • a CSP may comprise a single solid state die with provided thereon a luminescent material comprising layer.
  • the term “light source” may also refer to a midpower package.
  • a midpower package may comprise one or more solid state die(s).
  • the die(s) may be covered by a luminescent material comprising layer.
  • the die dimensions may be equal to or smaller than 2 mm, such as in the range of e.g. 0.2-2 mm.
  • the light source comprises a solid state light source.
  • the light source comprises a chip scale packaged LED.
  • a light generating device may comprise a light escape surface, such as an end window.
  • a light generating system may comprise a light escape surface, such as an end window.
  • the term “light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LEDs), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc.
  • the term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matnx (PMOLED) or an active-matrix (AMOLED).
  • the light source comprises a solid-state light source (such as an LED or laser diode).
  • the light source comprises an LED (light emitting diode).
  • the terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED).
  • the term LED may also refer to a plurality of LEDs.
  • the light source may be configured to provide primary radiation, which is used as such, such as e.g. a blue light source, like a blue LED, or a green light source, such as a green LED, and a red light source, such as a red LED.
  • a blue light source like a blue LED
  • a green light source such as a green LED
  • a red light source such as a red LED.
  • Such LEDs which may not comprise a luminescent material (“phosphor”) may be indicated as direct color LEDs.
  • the light source may be configured to provide primary radiation and part of the primary radiation is converted into secondary radiation. Secondary radiation may be based on conversion by a luminescent material. The secondary radiation may therefore also be indicated as luminescent material radiation.
  • the luminescent material may in embodiments be comprised by the light source, such as an LED with a luminescent material layer or dome comprising luminescent material. Such LEDs may be indicated as phosphor converted LEDs or PC LEDs (phosphor converted LEDs).
  • the luminescent material may be configured at some distance (“remote”) from the light source, such as an LED with a luminescent material layer not in physical contact with a die of the LED.
  • the light source may be a light source that during operation emits at least light at wavelength selected from the range of 380-470 nm. However, other wavelengths may also be possible. This light may partially be converted by the luminescent material.
  • the light generating device may comprise a luminescent material.
  • the light generating device may comprise a PC LED.
  • the light generating device may comprise a direct LED (i.e. no phosphor).
  • the light generating device may comprise a laser device, like a laser diode.
  • the light generating device may comprise a superluminescent diode.
  • the light source may be selected from the group of laser diodes and superluminescent diodes.
  • the light source may comprise an LED.
  • the light source may especially be configured to generate light source light having an optical axis (O), (a beam shape,) and a spectral power distribution.
  • the light source light may in embodiments comprise one or more bands, having band widths as known for lasers.
  • the term “light source” may (thus) refer to a light generating element as such, like e g. a solid state light source, or e g. to a package of the light generating element, such as a solid state light source, and one or more of a luminescent material comprising element and (other) optics, like a lens, a collimator.
  • a light converter element (“converter element” or “converter”) may comprise a luminescent material comprising element.
  • a solid state light source as such, like a blue LED, is a light source.
  • a combination of a solid state light source (as light generating element) and a light converter element, such as a blue LED and a light converter element, optically coupled to the solid state light source, may also be a light source (but may also be indicated as light generating device).
  • a white LED is a light source (but may e.g. also be indicated as (white) light generating device).
  • the term “light source” may (thus) in embodiments also refer to a light source that is (also) based on conversion of light, such as a light source in combination with a luminescent converter material.
  • the term “light source” may also refer to a combination of an LED with a luminescent material configured to convert at least part of the LED radiation, or to a combination of a (diode) laser with a luminescent material configured to convert at least part of the (diode) laser radiation.
  • the term “light source” may also refer to a combination of a light source, like an LED, and an optical filter, which may change the spectral power distribution of the light generated by the light source.
  • the term “light generating device” may be used to address a light source and further (optical components), like an optical filter and/or a beam shaping element, etc.
  • different light sources or “a plurality of different light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from at least two different bins.
  • solid state light source may especially refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, or a superluminescent diode.
  • LED light emitting diode
  • laser diode a laser diode
  • superluminescent diode a superluminescent diode
  • laser light source especially refers to a laser.
  • Such laser may especially be configured to generate laser light source light having one or more wavelengths in the UV, visible, or infrared, especially having a wavelength selected from the spectral wavelength range of 200-2000 nm, such as 300-1500 nm.
  • laser especially refers to a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
  • the light source comprises a laser light source.
  • the terms “laser” or “solid state laser” or “solid state material laser” may refer to one or more of cerium doped lithium strontium (or calcium) aluminum fluoride (Ce:LiSAF, Ce:LiCAF), chromium doped chrysoberyl (alexandrite) laser, chromium ZnSe (Cr:ZnSe) laser, divalent samarium doped calcium fluoride (Sm:CaF2) laser, Er:YAG laser, erbium doped and erbium-ytterbium codoped glass lasers, F-Center laser, holmium YAG (Ho:YAG) laser, Nd:YAG laser, NdCrYAG laser, neodymium doped yttrium calcium oxoborate Nd:YCa4O(BO3)s or Nd:YCOB, neodymium doped
  • solid state light source may especially refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, or a superluminescent diode.
  • LED light emitting diode
  • semiconductor-based light source may be applied.
  • the term “semiconductor-based light source” may e.g. refer to one or more of a light emitting diode (LED), a laser diode, and a superluminescent diode.
  • the light generating device may comprise one or more of a light emitting diode (LED), a laser diode, and a superluminescent diode.
  • Superluminescent diodes are known in the art.
  • a superluminescent diode may be indicated as a semiconductor device which may be able to emit low-coherence light of a broad spectrum like an LED, while having a brightness in the order of a laser diode US2020192017 indicates for instance that “With current technology, a single SLED is capable of emitting over a bandwidth of, for example, at most 50-70 nm in the 800- 900 nm wavelength range with sufficient spectral flatness and sufficient output power. In the visible range used for display applications, i. e. in the 450-650 nm wavelength range, a single SLED is capable of emitting over bandwidth of at most 10-30 nm with current technology.
  • the superluminescent diode is an emitter, which combines the features of laser diodes and light-emitting diodes. SLD emitters utilize the stimulated emission, which means that these devices operate at current densities similar to those of laser diodes.
  • the main difference between LDs and SLDs is that in the latter case, the device waveguide may be designed in a special way preventing the formation of a standing wave and lasing.
  • the presence of the waveguide ensures the emission of a high-quality light beam with high spatial coherence of the light, but the light is characterized by low time coherence at the same time” and “Currently, the most successful designs of nitride SLD are bent, curved, or tilted waveguide geometries as well as tilted facet geometries, whereas in all cases, the front end of the waveguide meets the device facet in an inclined way, as shown in Figure 9. 10.
  • the inclined waveguide suppresses the reflection of light from the facet to the waveguide by directing it outside to the lossy unpumped area of the device chip”.
  • an SLD may especially be a semiconductor light source, where the spontaneous emission light is amplified by stimulated emission in the active region of the device. Such emission is called “super luminescence”.
  • Superluminescent diodes combine the high power and brightness of laser diodes with the low coherence of conventional lightemitting diodes.
  • the low (temporal) coherence of the source has advantages that the speckle is significantly reduced or not visible, and the spectral distribution of emission is much broader compared to laser diodes, which can be better suited for lighting applications.
  • the first light generating arrangement may comprise a first solid state light source selected from the group comprising a superluminescent diode and a laser diode.
  • lasers may provide light that may almost completely be polarized in a particular direction.
  • polarizing optical elements such as polarizing filters, may (in addition) be used to polarize light in a desired polarization direction. Further, polarizing optical elements may be used to change a polanzation.
  • the luminescent body may comprise a luminescent material.
  • the luminescent body may be configured to (a) transmit at least part of the pump light (comprising the first polarization and/or the second polarization) and (b) convert at least part of the pump light (comprising the first polarization and/or the second polarization) into luminescent material light.
  • the luminescent body may in embodiments be partially transmissive for light of certain wavelengths. Hence, a part of the pump light incident on the luminescent body may be transmitted without undergoing any conversion. Additionally, in embodiments, a part of the pump light may also undergo conversion to luminescent material light when incident on the luminescent body.
  • the luminescent body may be configured such that part of the pump light is converted and part of the pump light is transmitted (this is known to a person skilled in the art, and may comply with the Lambert-Beer law). Hence, in this way, the light provided further downstream of the luminescent body may comprise a combination of both pump light as well as luminescent material light.
  • the light generating system may comprises a reflective polarizer.
  • the reflective polarizer may especially be configured downstream of the luminescent body Especially, the reflective polarizer may be transmissive for at least part of the luminescent material light. In this way, luminescent material light generated in the luminescent body and propagating to the reflective polarized may at least partly be transmitted.
  • the reflective polarizer may have a higher transmission for the pump light comprising the first polarization than for the pump light comprising the second polarization. Further, in embodiments, the reflective polarizer may have a lower reflectivity for the pump light comprising the first polarization than for the pump light comprising the second polarization.
  • a combination of (a) higher transmissivity and lower reflectivity for the pump light comprising the first polarization, and (b) lower transmissivity and higher reflectivity for the pump light comprising the second polarization may provide the benefit of allowing to control the spectral power distribution of the system light, especially the CCT, by controlling a ratio of pump light comprising the first polarization to pump light comprising the second polarization.
  • Reflection (at the reflective polarizer) of the pump light comprising the second polarization may be beneficial as the reflected pump light may especially be propagated again through at least part of the luminescent body.
  • a part of the unconverted pump light comprising the second polarization, reflected at the reflective polarizer may undergo a conversion to luminescent material light in a second pass through the luminescent body.
  • a portion of the generated luminescent material light incident on the reflective polarizer may (also) be transmitted (as the reflective polarizer may be transmissive for luminescent material light; see also above).
  • first polarized pump light may e g. lead to (system) light having a relatively high blue content, such as especially having a high CCT.
  • second polarized pump light may e.g. lead to (system) light having a relatively low blue content, such as especially having a low CCT.
  • the (relative) amount of luminescent material light (in the system light) outcoupled from the system may be increased or decreased.
  • the reflective polarizer may (also) be configured such that the reflective polarizer may have a higher transmission for the pump light comprising the second polanzation than for the pump light comprising the first polarization. Further, in embodiments, the reflective polarizer may have a lower reflectivity for the pump light comprising the second polarization than for the pump light comprising the first polarization.
  • intensity and/or spectral composition of the light outcoupled from the system may especially be controlled by controlling the polarization of the generated pump light.
  • the former embodiment(s) are discussed, i.e.
  • the reflective polarizer may have a higher transmission for the pump light comprising the first polarization than for the pump light comprising the second polarization, and (b) the reflective polarizer may have a lower reflectivity for the pump light comprising the first polarization than for the pump light comprising the second polarization.
  • the first polarization may be p-polarization and the second polarization may be s-polarization (or vice versa).
  • the light generating system may be configured to generate system light (i.e. the light outcoupled from the system).
  • the system light may in an operational mode comprise luminescent material light and pump light.
  • the spectral power distribution of the system light may thus in embodiments be controlled by controlling the polarization of the pump light.
  • the light generating system may comprise a control system or may be functionally coupled to a control system (configured to control the system light).
  • controlling the system light may comprise controlling the polarization of the pump light and the radiant flux of the pump light.
  • the spectral power distribution of the system light may be controlled.
  • control system may be configured to control (or operate in a mode of operation), the light generating system.
  • controlling and similar terms especially refer at least to determining the behavior or supervising the running of an element.
  • controlling and similar terms may e.g. refer to imposing behavior to the element (determining the behavior or supervising the running of an element), etc., such as e g. measuring, displaying, actuating, opening, shifting, changing temperature, etc.
  • controlling and similar terms may additionally include monitoring.
  • controlling and similar terms may include imposing behavior on an element and also imposing behavior on an element and monitoring the element.
  • control system which may also be indicated as “controller”.
  • the control system and the element may thus at least temporarily, or permanently, functionally be coupled.
  • the element may comprise the control system. In embodiments, the control system and element may not be physically coupled. Control can be done via wired and/or wireless control.
  • control system may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems.
  • a control system may comprise or may be functionally coupled to a user interface.
  • the control system may also be configured to receive and execute instructions from a remote control.
  • the control system may be controlled via an App on a device, such as a portable device, like a Smartphone or I-phone, a tablet, etc.
  • the device is thus not necessarily coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system.
  • control system may (also) be configured to be controlled by an App on a remote device.
  • the control system of the lighting system may be a slave control system or control in a slave mode.
  • the lighting system may be identifiable with a code, especially a unique code for the respective lighting system.
  • the control system of the lighting system may be configured to be controlled by an external control system which has access to the lighting system on the basis of knowledge (input by a user interface of with an optical sensor (e.g. QR code reader) of the (unique) code.
  • the lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or another wireless technology.
  • the system, or apparatus, or device may execute an action in a “mode” or “operation mode” or “mode of operation” or “operational mode”.
  • the term “operational mode may also be indicated as “controlling mode”.
  • an action or stage, or step may be executed in a “mode” or “operation mode” or “mode of operation” or “operational mode”. This does not exclude that the system, or apparatus, or device may also be adapted for providing another controlling mode, or a plurality of other controlling modes. Likewise, this may not exclude that before executing the mode and/or after executing the mode one or more other modes may be executed.
  • a control system may be available, that is adapted to provide at least the controlling mode.
  • the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme, may also be possible.
  • the operation mode may in embodiments also refer to a system, or apparatus, or device, which can only operate in a single operation mode (i.e. “on”, without further tunability).
  • control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer.
  • timer may refer to a clock and/or a predetermined time scheme.
  • the system light may be white light and may have a correlated color temperature (CCT) in a range from 1800 K to 20000 K, such as in the range 1800 K to 10000 K, especially in the range 3000 K to lOOOK.
  • the system light may be white light having a correlated color temperature selected from a range from 1800 to 6500 K.
  • the system light may have a color rendering index of at least 70, more especially at least 80, such as at least 85, especially at least 90.
  • a ratio of the radiant flux of the pump light comprising the first polarization relative to the radiant flux of the luminescent material light (in the system light) may be higher than a ratio of the radiant flux of the pump light comprising the second polarization relative to the radiation flux of the luminescent material light (in the system light) when pumping with pump light comprising the second polarization.
  • the reflective polarizer may in embodiments be (substantially) transmissive for pump light comprising the first polarization and (substantially) reflective for pump light comprising the second polarization.
  • control system may be configured to control a radiant flux of the pump light (see further also below). This may also allow controlling the radiant flux of the system light.
  • the light generating arrangement may generate pump light comprising the first polarization and/or the second polarization.
  • the first polarization and the second polarization may be selected from p-polarization and s- polarization.
  • a primary first solid state light source may generate (first) polarized pump light.
  • the light generating arrangement may comprise a secondary first solid state light source, which may be used to generate pump light of a different polarization from the first light source (especially second polarized light).
  • the primary first solid state light source and/or the secondary first solid state light source may (each) comprise a laser diode. Therefore, in embodiments, pump light of two different polarizations may be provided by using two laser diodes.
  • polarizers may be used to polarize the pump light.
  • the light generating arrangement may provide pump light of (multiple) desired polarizations. Therefore, the light generating arrangement may be used to generate pump light comprising a plurality of polarizations (for example, a combination of both p-polarized pump light and s-polarized pump light).
  • the first light generating arrangement may comprise one or more solid state light sources which provide light that is polarized light, or a polarization may be imposed on the light that is provided by the one or more solid state light sources.
  • a primary first solid state light source may be applied to generate in combination with a (first) polarizer (first) polarized pump light.
  • the light generating arrangement may comprise a secondary first solid state light source, configured to generate in combination with a (second) polarized (second) polarized light.
  • pump light of two different polarizations may be provided, either with a single light source or comprise two or more light sources.
  • the first light generating arrangement may comprise (a) a first pump light source (or “primary first (solid state) light source”) and (b) a second pump light source (or “secondary first (solid state) light source”).
  • the first light generating arrangement may comprise (a) a first pump light source (or “primary first light source”) and (b) a second pump light source (or “secondary first light source”).
  • the first pump light source optionally in combination with first optics, may be configured to generate the pump light comprising the first polarization.
  • the second pump light source may, optionally in combination with second optics, be configured to generate the pump light comprising the second polarization.
  • the first optics and/or the second optics may in embodiments be polaroid filters. Polaroid filters may especially convert unpolarized light to comprise a polarization in a specific orientation. The direction polarization may especially be controlled by controlling the orientation of the polaroid filter.
  • the pump light comprising both a first polarization and a second polarization
  • the first pump light source and the second pump light source may each comprise a laser diode.
  • the light generating arrangement may also comprise two different laser diodes of different polarizations to provide pump light comprising both the first polarization and the second polarization.
  • the first light generating arrangement comprises (a) a first pump light source and (b) a second pump light source; wherein the first pump light source, optionally in combination with first optics, is configured to generate the pump light comprising the first polarization, and wherein the second pump light source, optionally in combination with second optics, is configured to generate the pump light comprising the second polarization.
  • the first pump light source and/or the second pump light source may comprise a polarized light source i.e. the first pump light source and/or the second pump light source may provide polarized light.
  • additional polaroid filter (such as mentioned above) may be optional.
  • the total radiant flux of the system light may especially be controlled by means of the control system.
  • the control system may (also) be configured to control in an operational mode of the light generating system the correlated color temperature of the system light by controlling relative amounts of (a) the first radiant flux of the pump light comprising the first polarization and (b) the second radiant flux of the pump light comprising the second polanzation to a total radiant flux of the pump light.
  • control system may be configured to reduce in an operational mode of the light generating system a total radiant flux of the pump light (comprising the first polarization and/or the second polarization) by increasing a relative amount of a second radiant flux of the pump light comprising the second polarization to the total radiant flux of the pump light.
  • the radiant flux may be reduced. This may be a BBL dimming effect: higher radiant fluxes at higher CCTs and lower radiant fluxes at lower CCTs.
  • the system light may in embodiments comprise a combination of luminescent material light and pump light (comprising both the first polarization and the second polarization).
  • the system light in a first operational mode of the light generating system the system light comprises a first radiant flux ratio Xi/Y i of the pump light and the luminescent material light, wherein in a second operational mode of the light generating system the system light comprises a second radiant flux ratio X2/Y2 of the pump light and the luminescent material light, and wherein Xi/Y I>X2/Y 2, more especially Xi/Y i>1.2* X2/Y 2; .
  • the first radiant flux ratio being larger than the second radiant flux may be indicative of a relatively higher CCT.
  • X2/Xi ⁇ l may apply, such as X 2 /Xi ⁇ 0.8.
  • the pump light generated by the first light generating arrangement may in embodiments be incident on the luminescent body configured downstream of the light generating arrangement.
  • the luminescent material is comprised by a luminescent body.
  • the luminescent body may be a layer, like a self-supporting layer.
  • the luminescent body may also be a coating.
  • the luminescent body may also comprise a luminescent coating on a support (especially a light transmissive support in the transmissive mode, or a reflective support in the reflective mode).
  • the luminescent body may essentially be self-supporting.
  • the luminescent material may be provided as luminescent body, such as a luminescent single crystal, a luminescent glass, or a luminescent ceramic body. Such body may be indicated as “converter body” or “luminescent body”.
  • the luminescent body may be a luminescent single crystal or a luminescent ceramic body.
  • a cerium comprising garnet luminescent material may be provided as a luminescent single crystal or as a luminescent ceramic body.
  • the luminescent body may comprise a light transmissive body, wherein the luminescent material is embedded.
  • the luminescent body may comprise a glass body, with luminescent material embedded therein. Or, the glass as such may be luminescent.
  • the luminescent body may comprise a polymeric body, with luminescent material embedded therein.
  • the luminescent body may have any shape. In general, however, the luminescent body may comprise two essentially parallel faces, defining a height (of the luminescent body). Further, the luminescent body may comprise an edge face, bridging the two essentially parallel faces. The edge face may be curved in one or two dimensions. The edge face may be planar.
  • the luminescent body may have a rectangular or circular crosssection, though other cross-sections may also be possible, like e.g. hexagonal, octagonal, etc. Hence, the luminescent body may have a circular cross-section, an oval cross-section, square, or non-square rectangular.
  • the luminescent body may have an n-gonal crosssection, wherein n is at least 3, like 4 (square or rectangular cross-section), 5 (pentagonal cross-section), 6 (hexagonal cross-section), 8 (octagonal cross-section) or higher.
  • the two essentially parallel faces may also be indicated as “main faces”, as they may especially provide the largest external area of the luminescent body.
  • Perpendicular to the afore- mentioned cross-section may be another cross-section, which may in embodiments be rectangular.
  • the luminescent body may e.g.
  • the luminescent body may have a cubic shape, a (non-cubic) cuboid shape, an n-gonal prism shape with n being at least 5 (such as pentagonal pnsm, hexagonal prism), and a cylindrical shape.
  • Other shapes may also be possible.
  • the luminescent body may have a cuboid shape, a cylindrical shape, or an n-gonal prism shape wherein n is 6 or 8.
  • Hl ⁇ 10 mm such as especially Hl ⁇ 5mm, more especially Hl ⁇ 3mm, most especially Hl ⁇ 2 mm.
  • D ⁇ 10 mm such as especially D ⁇ 5mm, more especially D ⁇ 3mm, most especially D ⁇ 2 mm.
  • the body may have in embodiments a thickness in the range 50 pm - 1 mm. Further, the body may have lateral dimensions (width/diameter) in the range 100 pm - 10 mm. In yet further specific embodiments, (i) D>H1 or (ii) W1>H1 and L1>H1. Especially, the lateral dimensions like length, width, and diameter are at least 2 times, like at least 5 times, larger than the height.
  • the luminescent body has a first length LI, a first height Hl, and a first width Wl, wherein Hl ⁇ 0.5*Ll and HI ⁇ 0.5*WL
  • the luminescent body may comprises a first face, a second face, and a side face bridging the first face and the second face.
  • the first face and the second face may also be indicated as main faces.
  • the side face may be a single side face.
  • the side face may comprise four facets.
  • the side face may comprise six facets.
  • luminescent material may also refer to a plurality of different luminescent materials. Examples of possible luminescent materials are indicated below. Hence, the term “luminescent material” may in specific embodiments also refer to a luminescent material composition. Instead of the term “luminescent material” also the term “phosphor” may be applied. These terms are known to the person skilled in the art.
  • x3 is selected from the range of 0.001-0. 1.
  • xl>0 such as >0.2, like at least 0.8.
  • Garnets with Y may provide suitable spectral power distributions.
  • B-0 may be replaced by Si-N.
  • B in B-0 refers to one or more of Al, Ga, In and Sc (and O refers to oxygen); in specific embodiments B-0 may refer to Al-O.
  • x3 may be selected from the range of 0.001-0.04.
  • luminescent materials may have a suitable spectral distribution (see however below), have a relatively high efficiency, have a relatively high thermal stability, and allow a high CRI (optionally in combination with (the) light of other sources of light as described herein).
  • A may be selected from the group consisting of Lu and Gd.
  • B may comprise Ga.
  • the luminescent material comprises (Yxi-x2- x3(Lu,Gd)x2Cex3)3(Al y i- y 2Ga y 2)5Oi2, wherein Lu and/or Gd may be available.
  • x3 is selected from the range of 0.001-0.1, wherein 0 ⁇ x2+x3 ⁇ 0.1, and wherein 0 ⁇ y2 ⁇ 0.1.
  • at maximum 1% of B-0 may be replaced by Si-
  • the light generating device may only include luminescent materials selected from the type of cerium comprising garnets.
  • the light generating device includes a single type of luminescent materials, such as (Yxi-x2-x3A’x2Cex3)3(Alyi-y2B’ y 2)5Oi2.
  • the light generating device comprises luminescent material, wherein at least 85 weight%, even more especially at least about 90 wt.%, such as yet even more especially at least about 95 weight % of the luminescent material comprises (Yxi-x2-x3A’x2Ce X 3)3(Alyi-y2B’y2)5Oi2.
  • A’ comprises one or more elements selected from the group consisting of lanthanides
  • B’ comprises one or more elements selected from the group consisting of Ga, In and Sc
  • A may especially comprise at least Y, and B may especially comprise at least Al.
  • the luminescent material may comprises a luminescent material of the type A3SieNn:Ce 3+ , wherein A comprises one or more of Y, La, Gd, Tb and Lu, such as in embodiments one or more of La and Y.
  • the luminescent material may alternatively or additionally comprise one or more of MS:Eu 2+ and/or M2Si5N8:Eu 2+ and/or MAlSiNs:Eu 2+ and/or Ca2AlSi3O2Ns:Eu 2+ , etc., wherein M comprises one or more of Ba, Sr and Ca, especially in embodiments at least Sr.
  • the luminescent may comprise one or more materials selected from the group consisting of (Ba,Sr,Ca)S:Eu, (Ba,Sr,Ca)AlSiN3:Eu and (Ba,Sr,Ca)2Si5Ns:Eu.
  • europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations.
  • Eu will not be present in amounts larger than 10% of the cation; its presence will especially be in the range of about
  • Divalent europium will in general replace divalent cations, such as the above divalent alkaline earth cations, especially Ca, Sr or Ba
  • the material (Ba,Sr,Ca)S:Eu can also be indicated as MS:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calcium and strontium, more especially calcium.
  • Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca).
  • the material (Ba,Sr,Ca)2Si5Ns:Eu can also be indicated as M2SisN8:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound Sr and/or Ba.
  • M consists of Sr and/or Ba (not taking into account the presence of Eu), especially 50 to 100%, more especially 50 to 90% Ba and 50 to 0%, especially 50 to 10% Sr, such as Bai sSro sSisNsiEu (i.e. 75 % Ba; 25% Sr).
  • Eu is introduced and replaces at least part of M, i.e.
  • the material (Ba,Sr,Ca)AlSiNs:Eu can also be indicated as MAlSiNvEu.
  • M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calcium and strontium, more especially calcium.
  • Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca).
  • Eu in the above indicated luminescent materials is substantially or only in the divalent state, as is known to the person skilled in the art.
  • a red luminescent material may comprise one or more materials selected from the group consisting of (Ba,Sr,Ca)S:Eu, (Ba,Sr,Ca)AlSiN3:Eu and (Ba,Sr,Ca)2Si5Ns:Eu.
  • europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations.
  • Eu will not be present in amounts larger than 10% of the cation; its presence will especially be in the range of about 0.5 to 10%, more especially in the range of about 0.5 to 5% relative to the cation(s) it replaces.
  • the material (Ba,Sr,Ca)S:Eu can also be indicated as MS:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calcium and strontium, more especially calcium.
  • Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca).
  • the material (Ba,Sr,Ca)2SisN8:Eu can also be indicated as IVhSis Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound Sr and/or Ba.
  • M consists of Sr and/or Ba (not taking into account the presence of Eu), especially 50 to 100%, more especially 50 to 90% Ba and 50 to 0%, especially 50 to 10% Sr, such as Bai sSro.iSisNsYu (i.e. 75 % Ba; 25% Sr).
  • Eu is introduced and replaces at least part of M, i.e. one or more of Ba, Sr, and Ca).
  • the material (Ba.Sr.Ca)AlSiNvEu can also be indicated as MAlSiN3:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calcium and strontium, more especially calcium.
  • Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca).
  • Eu in the above indicated luminescent materials is substantially or only in the divalent state, as is known to the person skilled in the art.
  • luminescent material herein especially relates to inorganic luminescent materials.
  • luminescent materials may be applied.
  • quantum dots and/or organic dyes may be applied and may optionally be embedded in transmissive matrices like e.g. polymers, like PMMA, or polysiloxanes, etc. etc.
  • Quantum dots are small crystals of semiconducting material generally having a width or diameter of only a few nanometers. When excited by incident light, a quantum dot emits light of a color determined by the size and material of the crystal. Light of a particular color can therefore be produced by adapting the size of the dots.
  • Most known quantum dots with emission in the visible range are based on cadmium selenide (CdSe) with a shell such as cadmium sulfide (CdS) and zinc sulfide (ZnS).
  • Cadmium free quantum dots such as indium phosphide (InP), and copper indium sulfide (CuInS2) and/or silver indium sulfide (AgInS2) can also be used.
  • Quantum dots show very narrow emission band and thus they show saturated colors. Furthermore the emission color can easily be tuned by adapting the size of the quantum dots. Any type of quantum dot known in the art may be used in the present invention. However, it may be preferred for reasons of environmental safety and concern to use cadmium-free quantum dots or at least quantum dots having a very low cadmium content.
  • quantum confinement structures should, in the context of the present application, be understood as e g. quantum wells, quantum dots, quantum rods, tripods, tetrapods, or nano-wires, etcetera.
  • Organic phosphors can be used as well.
  • suitable organic phosphor materials are organic luminescent materials based on perylene derivatives, for example compounds sold under the name Lumogen® by BASF.
  • suitable compounds include, but are not limited to, Lumogen® Red F305, Lumogen® Orange F240, Lumogen® Yellow F083, and Lumogen® F170.
  • Different luminescent materials may have different spectral power distributions of the respective luminescent material light. Alternatively or additionally, such different luminescent materials may especially have different color points (or dominant wavelengths).
  • the luminescent material is selected from the group of divalent europium containing nitrides, divalent europium containing oxynitrides, divalent europium containing silicates, cerium comprising garnets, and quantum structures.
  • Quantum structures may e g. comprise quantum dots or quantum rods (or other quantum type particles) (see above). Quantum structures may also comprise quantum wells. Quantum structures may also comprise photonic crystals.
  • the light generating system may comprise additional optical elements that modify the quality or properties of the system light provided.
  • the light generating system may comprise an optical element downstream of the reflective polarizer.
  • Such an optical element may be referred to as a downstream optical element.
  • the downstream optical element may in embodiments comprise one or more of a depolarizer, a beam shaping element, a lens and a diffuser.
  • the depolarizer may remove the polarization of the system light such that the system light no longer has a single orientation (or direction) of polarization.
  • the downstream optical element may comprise a beam shaping element such as a hollow reflector or a collimator body, which may facilitate providing a parallel, a diverging or even a focused beam of light.
  • the downstream optical element may comprise a diffuser, which may provide diffused system light.
  • the terms “optical element” or “downstream optical element” may also refer to a plurality of such elements, respectively.
  • additional optical elements that may be reflective for luminescent material light may be configured upstream of the luminescent body. Hence, the luminescent material light reflected upstream of the luminescent body may undergo a subsequent reflection at the said optical elements and hence, be reflected back towards the luminescent body. Further, the luminescent body may especially be transmissive for luminescent material light. Hence, in this way, the amount of luminescent material light outcoupled from the light generating system (i.e. the amount of luminescent material light comprised by the system light) may be increased.
  • Such additional optical element, especially a reflector may be reflective for luminescent material light and transmissive for pump light. This may be achieved by using a dichroic mirror or a (dichroic) mirror with a (pin)hole for the pump light (see also below).
  • pump light may in embodiments be incident on the luminescent body and hence, undergo conversion to luminescent material light.
  • a part of the luminescent material light may be reflected in the upstream direction. Therefore, a part of the luminescent material light may not be outcoupled from the light generating system. This may in embodiments be mitigated by configuring a reflective element upstream of the luminescent body.
  • the light generating system may further comprise a first reflector configured downstream of the first light generating arrangement and upstream of the luminescent body.
  • the first reflector may be reflective for luminescent material light and transmissive for the pump light.
  • the pump light incident on the first reflector may be transmitted via the first reflector to the luminescent body.
  • the first reflector may be reflective for luminescent material light.
  • the luminescent material light reflected upstream may in embodiments be reflected back downstream.
  • the intensity of the luminescent material light comprised by the system light may especially be increased.
  • the first reflector may comprise a dichroic filter. Dichroic filters are filters (or reflectors) that may be transmissive for specific wavelengths of light while reflective for others.
  • the light generating system comprises a first reflector configured downstream of the first light generating arrangement and upstream of the luminescent body, wherein the first reflector is reflective for luminescent material light and transmissive for the pump light (wherein the first reflector comprises a dichroic filter).
  • the first reflector may comprise a pinhole.
  • the pinhole may be a small opening in the first reflector via which a narrow beam of pump light may be propagated without contacting the first reflector. Hence, in this way, the pump light may be incident on the luminescent body without being obstructed by the first reflector.
  • the pinhole may in embodiments be sufficiently small, such that the luminescent material light reflected upstream by luminescent body may be subsequently reflected by the first reflector (with minimal loss of luminescent material light via the pinhole).
  • the first reflector compnses a first pinhole, wherein the first light generating arrangement is configured to irradiate the luminescent body with the pump light via the first pinhole.
  • the spectral power distribution of the system light may be varied by configuring additional light generating arrangements.
  • the light generating system may further comprise a second light generating arrangement configured to generate second arrangement light having a spectral power distribution different from the pump light and different from the luminescent material light.
  • the second light generating arrangement may comprise a second solid state light source selected from the group comprising a superluminescent diode and a laser diode. Note that in embodiments, many different combinations of configuring the second light generating arrangement may be possible.
  • the second light generating arrangement may comprise two or more different second solid state light sources. In some embodiments, the second arrangement light may be directly outcoupled without an interaction with the luminescent body or the reflective polarizer.
  • the second arrangement light may especially bypass the luminescent body or the reflective polarizer.
  • the second light generating arrangement may be configured to bypass with at least part of its second arrangement light the luminescent body and the reflective polarizer.
  • This may in embodiments be achieved by means of an optical element (for example a dichroic filter) which may be transmissive for pump light (and luminescent material light) but may be reflective for second arrangement light.
  • the optical element may facilitate the transmission of pump light and luminescent material light.
  • the second light generating arrangement may especially be configured such that the second arrangement light may be reflected in the direction of the pump light and hence, bypass the luminescent body and the reflective polarizer.
  • the second light generating arrangement may be configured upstream of the luminescent body and the reflective polarizer. Furthermore, in such an embodiment, the second arrangement light may be outcoupled from the light generating system without bypassing the luminescent body and the optical reflector. Especially, the luminescent body may be transmissive for at least part of the second arrangement light. Furthermore, the reflective polarizer may especially be transmissive for at least part of the second arrangement light. This may especially be facilitated in embodiments when the second arrangement light also comprises light of the first polarization.
  • control system may especially control the operation of the first light generating arrangement.
  • control system may also control the operation of the second light generating arrangement.
  • the radiant flux of the second solid state light source may (also) be controlled by the control system.
  • one or more of the spectral power distribution, the radiant flux, and the CCT of the system light may especially by controlled further by controlling (also) the second light generating arrangement.
  • the light generating system may further comprise a second light generating arrangement, configured to generate second arrangement light having a spectral power distribution different from the pump light and different from the luminescent material light; wherein the second light generating arrangement comprises a second solid state light source selected from the group comprising a superluminescent diode and a laser diode; wherein the control system is configured to control spectral properties of the system light by controlling the polarization of the pump light and by controlling the second light generating arrangement.
  • a second light generating arrangement configured to generate second arrangement light having a spectral power distribution different from the pump light and different from the luminescent material light
  • the second light generating arrangement comprises a second solid state light source selected from the group comprising a superluminescent diode and a laser diode
  • the control system is configured to control spectral properties of the system light by controlling the polarization of the pump light and by controlling the second light generating arrangement.
  • the first reflector may comprise a second pinhole.
  • the second light generating arrangement may be configured to irradiate the luminescent body with the second arrangement light via the second pinhole. In this way, the second arrangement light may be incident on the luminescent body without contacting the first reflector (as indicated above).
  • the second arrangement light may comprise polarized light comprising the first polarization.
  • the first light generating arrangement may be configured to generate pump light having a wavelength in the blue wavelength range, alternatively or additionally, in (such) embodiments, the second arrangement light may comprise spectral intensity in one or more of the green wavelength range and the red wavelength range. Additional features in relation to the wavelength range of the pump light are discussed further below.
  • the first light generating arrangement may be configured to generate blue pump light.
  • the second light generating arrangement may be configured to generate red light.
  • the second light generating arrangement may be configured to generate green light.
  • a primary second light generating arrangement may be configured to generate green light and a secondary second light generating arrangement may be configured to generate red light.
  • the light generating system may comprise further optics.
  • the term “optics” may especially refer to (one or more) optical elements. Hence, the terms “optics” and “optical elements” may refer to the same items.
  • the optics may include one or more or mirrors, reflectors, collimators, lenses, prisms, diffusers, phase plates, polarizers, diffractive elements, gratings, dichroics, arrays of one or more of the afore-mentioned, etc.
  • the term “optics” may refer to a holographic element or a mixing rod.
  • the optics may include one or more of beam expander optics and zoom lens optics. See further above for examples of optics.
  • the optics may comprise an integrator, like a “Koehler integrator” (or “Kohler integrator”).
  • the optics may comprise beam shaping elements, such as optical elements selected from a group of a lens, a lens arrangement, a collimator, and a hollow reflector.
  • a lens for example a biconvex lens, plano-convex lens, biconcave lens, etc.
  • a lens arrangement may especially be a combination of one or more lenses.
  • the collimator and/or the hollow reflector may especially beam shape light to provide a parallel beam of light.
  • the first optics and/or the second optics may facilitate beam shaping the pump light.
  • the optics may be configured to shape a beam of system light. Yet, optics may also be used to shape a beam of light from the first light generating device.
  • violet light or “violet emission” especially relates to light having a wavelength in the range of about 380-440 nm.
  • blue light or “blue emission” especially relates to light having a wavelength in the range of about 440-495 nm (including some violet and cyan hues).
  • green light or “green emission” especially relate to light having a wavelength in the range of about 495-570 nm.
  • yellow light or “yellow emission” especially relate to light having a wavelength in the range of about 570- 590 nm.
  • range light or “orange emission” especially relate to light having a wavelength in the range of about 590-620 nm.
  • red light or “red emission” especially relate to light having a wavelength in the range of about 620-780 nm.
  • cyan may refer to one or more wavelengths selected from the range of about 490-520 nm.
  • the term “amber” may refer to one or more wavelengths selected from the range of about 585-605 nm, such as about 590-600 nm.
  • visible light especially relates to light having a wavelength selected from the range of 380-780 nm.
  • the light generating system may be part of or may be applied in e.g.
  • the light generating system may be part of or may be applied in e.g. optical communication systems or disinfection systems.
  • a projection device or “projector” or “image projector” may be an optical device that projects an image (or moving images) onto a surface, such as e.g. a projection screen.
  • the projection device may include one or more lighting generating systems such as described herein.
  • the invention also provides a lighting device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the lighting generating system as defined herein.
  • the lighting device may comprise a housing or a carrier, configured to house or support, one or more elements of the lighting generating system.
  • the lighting device may comprise a housing or a carrier, configured to house or support light generating arrangement.
  • Fig. 1 schematically depicts an embodiment of the light generating system 1000 comprising a first light generating arrangement 2100, a luminescent body 210, a reflective polarizer 500, and a control system 300.
  • the first light generating arrangement 2100 may be configured to generate pump light 2101 having a controllable polarization. Especially, the polarization of the generated pump light 2101 may be varied and the extent of this variation may be controlled (especially by a control system 300). In embodiments, the polarization may be controllable between a first polarization and a second polarization. Further, in embodiments, the first light generating arrangement 2100 may comprise a first solid state light source 10. Especially, the solid state light source 10 may be selected from the group comprising a superluminescent diode and a laser diode. Hence, in this way, these light sources may in embodiments provide a narrow beam of light. In embodiments, the solid state light source 10 may generate light source light 11.
  • a luminescent body 210 may be configured downstream of the solid state light source 10. Hence, in this way, the generated pump light 2101 escaping the light generating arrangement 2100 (comprising the solid state light source 10) may be incident upon the luminescent body 210.
  • the luminescent body 210 may comprise a luminescent material 200. Features of the luminescent material 200 used in embodiments are discussed further above. Essentially, the luminescent body 210 may convert a part of the generated pump light 2101 into luminescent material light 201.
  • the luminescent body 210 may be configured to (a) transmit at least part of the pump light 2101 (comprising the first polarization and/or the second polarization) and (b) convert at least part of the pump light 2101 (comprising the first polarization and/or the second polarization) into luminescent material light 201.
  • the light generating arrangement 2100 may generate pump light 2101, which may subsequently be incident upon the luminescent body 210 and undergo partial conversion such that the light provided downstream of the luminescent body 210 may comprise both pump light 2101 and luminescent material light 201.
  • the luminescent body may comprises a first face, a second face, and a side face bridging the first face and the second face.
  • the first face may be configured upstream from the second face.
  • the first face may be directed to the first light generating arrangement 2100.
  • the second face may thus be configured downstream of the first face.
  • the second face may be directed to the reflective polarizer 500.
  • light for example: pump light 2101
  • transmitted through the luminescent body 210 may especially escape via the second face.
  • light reflected by the luminescent body 210 may especially escape from the first face. In some embodiments, some of the luminescent light may escape via the side face of the luminescent body 210.
  • the light provided downstream of the reflective polarizer 500 may comprise a combination of both pump light 2101 and luminescent material light 201. Consequently, the light generating system 1000 may be configured to generate system light 1001, wherein the system light 1001 may comprise the pump light 2101 and the luminescent material light 201.
  • control system 300 may be configured to control spectral properties of the system light 1001 by controlling the polarization of the pump light 2101. Further, the control system 300 may be configured to control the system light 1001 in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. In embodiments, the control system 300 may be configured to control the system light 1001 by controlling the light generating arrangement 2100, such as by controlling one or more of the polarization of the pump light 2101 and the radiant flux of the pump light 2101.
  • control system 300 may be configured to reduce in an operational mode of the light generating system 1000 a total radiant flux of the pump light 2101 (comprising the first polarization and/or the second polarization) when (also) increasing a relative amount of a second radiant flux of the pump light 2101 comprising the second polarization to the total radiant flux of the pump light 2101.
  • a total radiant flux of the pump light 2101 comprising the first polarization and/or the second polarization
  • the total radiant flux of the pump light 2101 may be reduced.
  • the light generating system 1000 may provide the feature of dimming the system light 1001.
  • the total radiant flux of the pump light 2101 may be reduced such that the ratio of the second radiant flux (of the pump light 2101) to the first radiant flux (of the pump light 2101) is increased.
  • the spectral power distribution of the light generating system 1000 may be controlled.
  • a part of the light incident upon the luminescent body 210 may in embodiments be absorbed.
  • a part of the incident light may especially (also) undergo scattering by the luminescent body 210 and a part of the incident light may especially be transmitted.
  • the luminescent body 210 may at least be partially transmissive for pump light 2101.
  • the luminescent body 210 may at least be (partially) transparent.
  • the luminescent body 210 may comprise a ceramic body or a single crystalline body.
  • the light generating system 1000 may further comprise a downstream optical element 580 comprising one or more of a depolarizer, a beam shaping element, a lens, and a diffuser.
  • the downstream optical element 580 may be configured downstream of the reflective polarizer 500.
  • the light incident on the depolarizer may scramble the polarization of light and may hence no longer be polarized.
  • the beam shaping element may especially comprise a hollow reflector or a collimator which may especially facilitate the beam shaping the light incident upon it (i.e. the pump light 2101 and/or the luminescent material light 201).
  • the luminescent body 210 may be configured such that (under perpendicular radiation with the pump light 2101) in the range of 30-80% of a total radiant flux of the pump light 2101 may be absorbed by the luminescent body 210 in a single pass through the luminescent body 210.
  • the luminescent body 210 may especially absorb a part of the total radiant flux of the pump light 2101, wherein the extent of absorption may depend on the thickness of the luminescent body 210. That is, in embodiments, a thicker luminescent body 210 may absorb a larger amount of the total radiant flux of the pump light 2101.
  • the extent of absorption of the total radiant flux of the pump light 2101 may be dependent on the luminescent material 200 comprised by the luminescent body 210.
  • the luminescent material 200 may comprise a luminescent material of the type AsBsOn Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.
  • the luminescent body 210 may especially convert light having a wavelength in the blue wavelength range.
  • the first light generating arrangement 2100 may especially be configured to generate pump light 2101 having a wavelength in the blue wavelength range.
  • FIG. 2a depicts the functioning of an embodiment of the light generating system 1000 especially with respect to the configuration of the reflective polarizer 500.
  • pump light 2101 comprising both the first polarization and the second polarization may be incident on the luminescent body 210.
  • the first polarization and the second polarization may be selected from p-polarization 2101p and s-polarization 2101s.
  • the luminescent body 210 may in embodiments be (at least partially) transparent (for the pump light 2101).
  • a part of the pump light 2101 may undergo conversion to the luminescent material light 201 and the part of the pump light 2101 may remain unconverted.
  • the p-polarized pump light 2101p and the luminescent material light 201 may subsequently be incident on the reflective polarizer 500.
  • the reflective polarizer 500 may be reflective for s- polarized light and transmissive for p-polarized light. Therefore, the spectral power distribution of the system light 1001 may comprise peak intensities for p-polarized pump light 2101p and luminescent material light 201 as indicated in the spectral distribution in Fig. 2a (right).
  • the pump light 2101 may (also) comprise s- polarized pump light 2101s.
  • the s-polarized pump light 2101s may be incident on the luminescent body 210 and a part of the s-polarized pump light 2101s may undergo conversion to luminescent material light 201 and part of the s-polarized pump light 2101s may remain unconverted. Further, in embodiments, s-polarized pump light 2101s may undergo partial depolarization due to scattering of light within the luminescent body 210. The light outcoupled from the luminescent body 210 may especially be incident on the reflective polarizer 500 configured further downstream (of the luminescent body 210). As mentioned above, the reflective polarizer 500 may in embodiments be reflective for s-polarized light.
  • the s-polarized pump light 2101s may be reflected upstream (back) towards the luminescent body 210.
  • This reflected s-polarized pump light 2101s may in embodiments undergo a subsequent conversion to luminescent material light 201 and may be scattered in the direction of the reflective polarizer 500.
  • the s-polarized pump light 2101s may undergo conversion to luminescent material light 201.
  • the part of the pump light 2101 not comprising s-polarization may in embodiments (at least partly) be transmitted via the reflective polarizer 500.
  • the spectral power distribution in such a scenario may comprise pump-light 2101 having zero or minimal intensity of p-polarized pump light 2101p (due to partial scattering and depolarization of the s-polarized pump light 2101s) and the spectral distribution may only show peak intensity for luminescent material light 201 (see Fig. 2a (right)).
  • the intensity of luminescent material light 201 converted from s-polanzed pump light 2101s may be higher than the intensity of luminescent material light 201 converted from p-polarized pump light 2101p; since s-polarized pump light 2101s may undergo conversion multiple times (as described above).
  • Fig. 2b depicts embodiments of a light generating arrangement 2100 configured to generate pump light 2101.
  • embodiment I depicts an embodiment comprising two different light sources 10, herein also indicated with references 2110,2120, configured to generate p-polarized pump light 2101p and s-polarized pump light 2101s, respectively.
  • the p-polarized pump light 2101p may comprise p-polarized light source light lip and the s-polarized pump light 2101s may comprise the s-polarized light source light Ils.
  • pump light 2101 of two different polarizations may be generated. This may also facilitate controlling a ratio of the pump light 2101p,2101s with the respective different polarizations.
  • the first light generating arrangement 2100 may comprise (different) light sources 10, which may not provide the already desired polarized light. These light sources are herein also indicated with reference 2110,2120.
  • the first pump light source 2110 optionally in combination with first optics 591, may be configured to generate the pump light 2101 comprising the first polarization, i.e. p-polarized pump light 2101p.
  • the second pump light source 2120 may optionally in combination with second optics 592 be configured to generate the pump light 2101 comprising the second polarization, i.e. s-polarized pump light 2101s.
  • pump light 2101 of two different polarizations may be generated.
  • embodiment III depicts the first light generating arrangement 2100 comprising light source 10.
  • the light source 10 generates light source light 11.
  • the light source light 11 may be incident on third optics 593, wherein the light source light 11 may be polarized by the third optics to provide pump light 2101.
  • the third optics 593 may be able to control the polarization of the pump light 2101 into one or more of the first polarization and the second polarization.
  • Fig. 2c schematically depicts embodiments of the light generating system 1000 comprising the first reflector 530.
  • the first reflector 530 may be configured downstream of the first light generating arrangement 2100 (not depicted) and upstream of the luminescent body 210.
  • the first reflector 530 may be reflective for luminescent material light 211 and transmissive for the pump light 2101.
  • the first reflector 530 may comprise a dichroic filter. The operation of such embodiments is illustrated in two embodiments.
  • the first reflector 530 may be transmissive for pump light 2101.
  • pump light 2101 may be transmitted via the first reflector 530 and be incident on the luminescent body 210.
  • a part of the pump light 2101 may remain unconverted and may be incident on the reflective polarizer 500 (which may be configured to be transmissive for a specific polarization angle (for example p-polarization or s-polarization)).
  • pump light 2101 may be outcoupled.
  • a part of the pump light 2101 incident on the luminescent body 210 may undergo conversion to luminescent material light 201, some of which may be transmitted (through the luminescent body) and be outcoupled via the reflective polarizer 500, while a part of the luminescent material light 201 may be reflected upstream onto the first reflector 530.
  • the luminescent material light 201 incident on the first reflector 530 may be reflected (back) downstream in the direction of the luminescent body 210, wherein at least a part of the luminescent material light 201 may be outcoupled via the reflective polarizer 500.
  • the luminescent material light 201 outcoupled may be increased by using the first reflector 530 (which may be reflective for luminescent material light 530).
  • the reflector 530 may e.g. be a dichroic filter, transmissive for the pump light 2101 but reflective for the luminescent material light 201.
  • the first reflector 530 may (also) comprise a first pinhole 531.
  • the first pinhole 531 in embodiments may provide the benefit of not obstructing the path of the pump light 2101.
  • the first light generating arrangement 2100 may be configured to irradiate the luminescent body 210 with the pump light 2101 via the first pinhole 531.
  • the pump light 2101 may be incident on the luminescent body 210 without an interaction with other elements comprised by the light generating system 1000.
  • the pump light 2101 may undergo partial conversion to luminescent material light 201, and both pump light 2101 and luminescent material light 201 may be provided.
  • the first reflector 530 may be a dichroic filter, but may especially be a simple reflector, such as having a metallic coating, like an Al coating.
  • Fig. 2d schematically depicts embodiments of the light generating system 1000 further comprising a second light generating arrangement 2200.
  • the second light generating arrangement 2200 may be configured to generate second arrangement light 2201 having a spectral power distribution different from the pump light 2101 and different from the luminescent material light 201.
  • the spectral power distribution of the system light 1001 may in embodiments be further controlled (or varied).
  • the second light generating arrangement 2200 may comprise a second solid state light source 20 selected from the group comprising a superluminescent diode and a laser diode.
  • the control system 300 may be configured to control spectral properties of the system light 1001 by controlling the polarization of the pump light 2101 and by controlling the second light generating arrangement 2200 (as shown in embodiments I-V).
  • the second arrangement light 2201 may comprise spectral intensity in one or more of the green wavelength range and the red wavelength range.
  • the control system 300 may control the intensity of the one or more light generating arrangements 2100, 2200. Hence, in this way, the control system 300 may vary or control the spectral power distribution of the system light 1001 outcoupled
  • the second light generating system 2200 is configured upstream of the luminescent body 210.
  • the luminescent body 210 may be transmissive for at least part of the second arrangement light 2201.
  • the reflective polarizer 500 may (also) be transmissive for at least part of the second arrangement light 2201.
  • the second arrangement light 2201 may comprise polarized light comprising the first polarization.
  • the second arrangement light 2201 may (also) comprise polarized light comprising the second polarization as depicted in embodiment I.
  • the second light generating arrangement 2200 may be configured in a different spatial location than the first light generating arrangement 2100.
  • the pump light 2101 may (also) be directed in a different direction than the second arrangement light 2201.
  • a partially transmissive optical element 550 (for example a dichroic mirror) may be configured upstream of the luminescent body 210.
  • the optical element 550 may in embodiments be transmissive for pump light 2101. Therefore, in this way, the pump light 2101 incident on the optical element 550 may be transmitted through the optical element 550 and may be incident on the luminescent body 210 (and subsequently on the reflective polarizer 500).
  • the second arrangement light 2201 may also be incident upon the optical element 550.
  • the optical element 550 may in embodiments be reflective for the second arrangement light 2201.
  • the second arrangement light 2201 may be reflected by the optical element 550 in the direction of the luminescent body 210 (and subsequently the reflective polarizer 500).
  • Embodiment III depicted in Fig. 2d may comprise similar features as described in embodiment II. For the sake of brevity, these features are not repeated.
  • Embodiment III differs from embodiment II in that the first reflector 530 may be configured upstream of the luminescent body 210 and the reflective polarizer 500. Furthermore, in embodiments, the first reflector 530 may comprise the pinhole 531.
  • the pump light 2101 and the second arrangement light 2201 may be incident on the luminescent body 210 without contacting the first reflector 530.
  • the converted luminescent material light 201 may be reflected by the first reflector 530 in the downstream direction.
  • the intensity of luminescent material light 201 comprised by the system light 1001 may be increased.
  • Embodiment IV depicted in Fig. 2d depicts an embodiment comprising the first reflector 530 further comprising the first pinhole 531 and an additional second pinhole 532.
  • the light generating system 1000 may comprise the first light generating arrangement 2100 and the second light generating arrangement 2200, wherein the pump light 2101 may be incident on the luminescent body 210 via the first pinhole 531.
  • the second arrangement light 2201 may be incident on the luminescent body 210 via the second pinhole 532.
  • the first reflector 530 may provide the advantage of reflecting the luminescent material light 201, and thus, increasing the intensity of the luminescent material light 201 comprised by the system light 1001.
  • the second light generating arrangement 2200 may be configured to bypass with at least part of its second arrangement light 2201 the luminescent body 210 and the reflective polarizer 500.
  • the light generating arrangement 2100 may generate pump light 2101 which may be incident on the luminescent body 210 (and subsequently on the reflective polarizer 500).
  • the optical element 550 may be configured further downstream of the reflective polarizer 500, wherein the reflective polarizer 500 may be transmissive for pump light 2101 Hence, in this way, system light 1001 comprising pump light 2101 may especially be provided.
  • the light generating system 100 may further comprise the second light generating arrangement 2200 which may provide second arrangement light 2201.
  • the second arrangement light 2201 may be incident on the optical element 550.
  • the optical element 550 may be reflective for the second arrangement light 2201, and hence, the second arrangement light 2201 may be reflected in the direction of the pump light 2101.
  • system light 1001 comprising a combination of pump light 2101, second arrangement light 2201 and luminescent material light 201 may be provided.
  • the optical element 550 may be configured downstream of the reflective polarizer 500 and hence, the second arrangement light 2201 may be provided such that it may bypass the luminescent body 210 and the reflective polarizer 500.
  • Fig. 3 schematically depicts an embodiment of a lighting device 1200.
  • a lighting device 1200 may be selected from the group of a lamp 1, a luminaire 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the lighting system 1000 as described herein.
  • Reference 301 indicates a user interface which may be functionally coupled with the control system 300 comprised by or functionally coupled to the lighting system 1000.
  • the figure also schematically depicts an embodiment of lamp 1 comprising the lighting system 1000.
  • Reference 3 indicates a projector device or projector system, which may be used to project images, such as at a wall, which may also comprise the lighting system 1000.
  • such a lighting device may be a lamp 1, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device.
  • Lighting device light escaping from the lighting device 1200 is indicated with reference 1201.
  • Lighting device light 1201 may essentially consist of system light 1001, and may in specific embodiments thus be system light 1001.
  • Reference 1300 indicates a space, such as an office or a living room, wherein the reference 1307 corresponds to the walls of the living room and reference 1305 corresponds to the floor.
  • the term “plurality” refers to two or more.
  • the terms “substantially” or “essentially” herein, and similar terms, will be understood by the person skilled in the art.
  • the terms “substantially” or “essentially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed.
  • the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%.
  • the term “comprise” also includes embodiments wherein the term “comprises” means “consists of’.
  • the term “and/or” especially relates to one or more of the items mentioned before and after “and/or”.
  • a phrase “item 1 and/or item 2” and similar phrases may relate to one or more of item 1 and item 2.
  • the term “comprising” may in an embodiment refer to “consisting of' but may in another embodiment also refer to "containing at least the defined species and optionally one or more other species”.
  • first, second, third and the like in the description and in the claims are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. Use of the verb "to comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim.
  • the invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer.
  • a device claim, or an apparatus claim, or a system claim enumerating several means, several of these means may be embodied by one and the same item of hardware.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
  • the invention (thus) provides a software product, which, when running on a computer is capable of bringing about (one or more embodiments of) the method as described herein.
  • the invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process.
  • the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system.
  • the invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.
  • the invention further pertains to a method or process comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Semiconductor Lasers (AREA)

Abstract

L'invention concerne un système de génération de lumière (1000) comprenant un premier agencement de génération de lumière (2100), un corps luminescent (210), un polariseur réfléchissant (500) et un système de commande (300) ; le premier agencement de génération de lumière (2100) étant configuré pour générer une lumière de pompage (2101) ayant une polarisation pouvant être commandée, la polarisation pouvant être commandée entre une première polarisation et une seconde polarisation ; le premier agencement de génération de lumière (2100) comprenant une première source de lumière à semi-conducteurs (10) sélectionnée dans le groupe comprenant une diode superluminescente et une diode laser ; le corps luminescent (210) comprenant un matériau luminescent (200) ; le corps luminescent (210) étant configuré pour (a) transmettre au moins une partie de la lumière de pompage (2101) (comprenant la première polarisation et/ou la seconde polarisation) et (b) convertir au moins une partie de la lumière de pompage (2101) (comprenant la première polarisation et/ou la seconde polarisation) en une lumière de matériau luminescent (201) ; le polariseur réfléchissant (500) étant configuré en aval du corps luminescent (210) ; le polariseur réfléchissant (500) transmettant au moins une partie de la lumière de matériau luminescent (201) ; le polariseur réfléchissant (500) ayant une transmission supérieure pour la lumière de pompage (2101) comprenant la première polarisation que pour la lumière de pompage (2101) comprenant la seconde polarisation, le polariseur réfléchissant (500) ayant une réflectivité inférieure pour la lumière de pompage (2101) comprenant la première polarisation que pour la lumière de pompage (2101) comprenant la seconde polarisation ; le système de génération de lumière (1000) étant configuré pour générer une lumière de système (1001) ; et le système de commande (300) étant configuré pour commander des propriétés spectrales de la lumière de système (1001) par commande de la polarisation de la lumière de pompage (2101).
EP23787135.5A 2022-10-21 2023-10-16 Appareil d'éclairage de scène à base de phosphore laser fournissant une commande ctt Pending EP4605682A1 (fr)

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EP22202939 2022-10-21
PCT/EP2023/078678 WO2024083743A1 (fr) 2022-10-21 2023-10-16 Appareil d'éclairage de scène à base de phosphore laser fournissant une commande ctt

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Publication number Priority date Publication date Assignee Title
US20100032695A1 (en) * 2008-08-05 2010-02-11 The Regents Of The University Of California Tunable white light based on polarization sensitive light-emitting diodes
JP5874058B2 (ja) * 2010-12-06 2016-03-01 パナソニックＩｐマネジメント株式会社 光源装置および投写型表示装置
CN103913936B (zh) * 2012-12-28 2016-12-07 深圳市绎立锐光科技开发有限公司 发光装置及投影系统
RU2648080C1 (ru) 2014-09-11 2018-03-22 Филипс Лайтинг Холдинг Б.В. Сид-модуль с преобразованием люминофором с улучшенными передачей белого цвета и эффективностью преобразования
CN107272312A (zh) 2016-04-06 2017-10-20 上海蓝湖照明科技有限公司 发光装置及相关投影系统与照明系统
CN110658669A (zh) 2018-06-29 2020-01-07 深圳市绎立锐光科技开发有限公司 光源装置
GB2579801B (en) 2018-12-13 2021-04-14 Exalos Ag Superluminescent diode module
US11920744B2 (en) 2020-08-13 2024-03-05 Signify Holding B.V. Eye safe laser lighting system using built in safety

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