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WO2012137126A1 - Guide de lumière à conversion de longueurs d'ondes - Google Patents

Guide de lumière à conversion de longueurs d'ondes Download PDF

Info

Publication number
WO2012137126A1
WO2012137126A1 PCT/IB2012/051601 IB2012051601W WO2012137126A1 WO 2012137126 A1 WO2012137126 A1 WO 2012137126A1 IB 2012051601 W IB2012051601 W IB 2012051601W WO 2012137126 A1 WO2012137126 A1 WO 2012137126A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
guide
wavelength converting
face
wavelength
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.)
Ceased
Application number
PCT/IB2012/051601
Other languages
English (en)
Inventor
Ties Van Bommel
Rifat Ata Mustafa Hikmet
Roy Gerardus Franciscus Antonius Verbeek
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of WO2012137126A1 publication Critical patent/WO2012137126A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer

Definitions

  • the present invention relates to a light-guide comprising a wavelength converting member and a reflector.
  • LED Light-emitting diode
  • LEDs offer advantages over traditional light sources, such as incandescent and fluorescent lamps, including long lifetime, high lumen efficacy, low operating voltage and fast modulation of lumen output.
  • Efficient high-power LEDs are often based on blue light emitting materials.
  • a wavelength converting material also known as a phosphor, may be employed to convert part of the blue light emitted by the LED into light of longer wavelengths and thereby affording a mixture of wavelengths corresponding to a desirable color output (e.g. white).
  • a desirable color output e.g. white
  • such phosphor material may be applied directly on the LED, or alternatively, in order to avoid heat conduction from the LED to the phosphor material, it may be arranged at a certain distance from the LED (so-called remote configuration).
  • WO 2010/052633 discloses a light guide wherein light is guided through total internal reflection at a front and rear surface of the light guide, and wherein the light guide comprises a plurality of outcoupling elements comprising a phosphor and arranged on the rear surface such that light is outcoupled from the front surface.
  • Light guides such as the one disclosed in WO 2010/052633, comprising a phosphor material which is visible to a viewer, have a colored appearance, even when the LEDs are not operated. In some cases this may not be desirable.
  • a light-guide configured to guide light through total internal reflection between a first face and a second face thereof, comprising a plurality of wavelength converting members distributed across the light-guide and comprising at least one wavelength converting material configured to absorb light of a first wavelength and emit converted light of a second wavelength towards the second face; and a plurality of reflectors, each being arranged on a first side of a respective one of the wavelength converting members, wherein the first side faces away from the second face of the light-guide, thus shielding the wavelength converting members from a viewer looking at the first face of the light-guide.
  • the first wavelength is typically different from the second wavelength.
  • light-guide an optical element which is at least partly transmissive to light of at least one wavelength within the wavelength range including visible, infrared and ultra-violet light, and the light-guide may thus typically be made of any suitable material known to the skilled person in the art, for example a polymer based material.
  • the light-guide may be arranged in a light-emitting device comprising a reflective member which may be arranged at an outer side of the second face of the light- guide, for example along the extent of the second face of the light-guide, such that light that is emitted from the wavelength converting member and/or reflected at the reflectors and subsequently outcoupled from the second face, is reflected at the reflective member back (through the second face) towards the first face, and thus ensuring that light exits from a desired first face of the light-guide, i.e. in the direction of a viewer.
  • the above described arrangement of a reflective member is also advantageous as it allows for further interactions between the reflected light and the wavelength converting members, which in turn may increase the amount of light of the first wavelength converted by the wavelength converting members, and consequently improving the efficacy of such device.
  • the wavelength converting members are not visible to a viewer looking at the first face of the light-guide and so the color appearance of the light-guide due to any interaction between ambient light and the wavelength converting members is reduced, whereas at the same time, by means of a reflective member as described above, light may be outcoupled from this first face towards the viewer.
  • the light-guide may comprise at least one reflective member arranged on a second side of the wavelength converting members, wherein the second side of the wavelength converting members is opposite the first side thereof.
  • the light-guide may comprise a plurality of reflective members each being arranged on the second side of a respective one of the wavelength converting members.
  • each wavelength converting member may be sandwiched between a reflector and a reflective member and thereby a partly transparent light-guide having reduced color appearance from the both a first and a second face thereof may be achieved.
  • the wavelength converting member may comprise a second wavelength converting material typically configured to absorb light of a first wavelength and emit converted light of a third wavelength.
  • the second wavelength converting material may be configured to absorb light of a wavelength different from the first wavelength and emit converted light of the second wavelength.
  • the third wavelength is typically different from the first wavelength and the second wavelength.
  • the first wavelength may be in the range of from 380 to 520 nm, such as, for example, from 440 to 480 nm.
  • the first and/or second wavelength converting material may comprise an organic luminescent molecule such as a perylene derivative.
  • the first and/or second wavelength converting material may comprise an inorganic luminescent material such as cerium doped yttrium aluminum garnet (YAG) or lutetium aluminum garnet (LuAG).
  • YAG cerium doped yttrium aluminum garnet
  • LuAG lutetium aluminum garnet
  • the first and/or second wavelength converting material may comprise quantum dots.
  • the light-guide according to the invention may be comprised in a light-emitting device further comprising at least one light-source arranged at an incoupling face of the light-guide, wherein the incoupling face is arranged to receive light from the light- source such that total internal reflection at the first and second face of the light-guide is enabled.
  • the light-guide according to the invention may be comprised in a light- emitting device, further comprising a plurality of light-sources, each being arranged between the first side of a respective one of the wavelength converting members and a respective one of the reflectors.
  • the light-emitting device may comprise a reflective member arranged on an outer side of the second face of the light-guide such that light outcoupled from the first face of the light-guide may be reflected back into the light- guide and subsequently outcoupled from the first face of the light-guide.
  • a reflective member may be arranged directly on the outer side of the second face, or alternatively, arranged at a distance therefrom.
  • the reflective member may be separated from the outer side of the second face by any medium or material, however, preferably a transparent medium or material such as, for example, air or a polymeric material, whose refraction index is lower than that of the core material of the light-guide such that light can be guided in the light-guide by means of total internal reflection at the second face.
  • a transparent medium or material such as, for example, air or a polymeric material, whose refraction index is lower than that of the core material of the light-guide such that light can be guided in the light-guide by means of total internal reflection at the second face.
  • the reflectivity of the reflective member may, for example, be at least 60%, preferably at least 80%, and more preferably at least 90%.
  • the light-source(s) may preferably comprise at least one solid state light-source such as a LED or a laser.
  • Figs la-n show a cross-sectional side view of embodiments of the light-guide according to the invention.
  • Figs 2a-d show a cross-sectional side view of embodiments of the light- emitting device according to the invention.
  • Figs, la-n show exemplary embodiments of the light-guide according to the invention.
  • Fig la shows a light-guide 10 configured to guide light emitted from a light-source (not shown) through total internal reflection between a first face 107 and a second face 108 thereof.
  • the core body 102 of the light- guide may preferably be made of any translucent or transparent material such as, for example, any suitable polymeric material such as polymethylmethacrylate (PMMA) or glass or a fluid.
  • PMMA polymethylmethacrylate
  • the light-guide 10 comprises a plurality of wavelength converting members 101 arranged on an outer side 106 of the first face 107 of the light guide, wherein each wavelength converting member 101 comprises at least one wavelength converting material configured to absorb light of a first wavelength and to emit converted light of a second wavelength.
  • the light-guide in Fig. la further comprises a plurality of reflectors 100, each being arranged on a first side 104 of a respective one of the wavelength converting members 101, wherein the first side 104 faces away from the second face 108 of the light-guide 10, thus shielding the wavelength converting members 101 from a viewer 1 looking at the first face 107 of the light-guide 10.
  • the reflectors 100 may be provided directly on the first side 104 of each wavelength converting member, for example by providing a reflective coating thereon.
  • the reflectors 100 may be arranged at a distance from the wavelength converting members 101, on the first side 104 thereof, such that at least a portion of the wavelength converting members is shielded by the reflectors 100.
  • the wavelength converting member 101 is arranged on the outer side 106 of the first face 107 of the light guide 12, 13 and the reflector 112, 113 is arranged to cover the first side 104 of the wavelength converting member 101 as well as at least one of a vertical side 118 thereof, whereas in the light-guides 14, 15 shown in Figs, ld-e, the first side 104 and both vertical sides 118 are coated with the reflector 114, 115.
  • two wavelength converting members 101 can be enclosed by a reflector 115.
  • Figs, lf-i show further exemplary embodiments of various possible arrangements of the wavelength converting members 101 and reflectors 100 in the light-guides 16-19.
  • the reflector 100 is arranged on the outer side 106 of the first face 107 of the light-guide 16, whereas a respective wavelength converting member 101 is arranged on a corresponding inner side 109 of the first face 107 of the light-guide 16.
  • the reflector 100 is arranged on a first side 104 of the wavelength converting member 101, both of which are arranged in between the first 107 and second 108 face of the light-guide 17, 18, 19.
  • the reflector 100 is arranged on an inner side 109 of the first face 107, and in Fig li the wavelength converting member is arranged on an inner side 110 of the second face 108 of the light-guide 19. Also, as shown in Fig lh, the reflector 100 and the wavelength converting member 101 arranged thereon may be disposed in the core body 102 of the light-guide.
  • the light-guide may comprise a plurality of reflective members 117 as shown Figs, lj-n, having a similar size as that of the reflectors 100 and wherein each reflective member 117 is arranged on a second side 103 of a respective wavelength converting member 101 such that each respective wavelength converting member 101 is at least partly arranged in between the reflector 100 and reflective member 117.
  • the reflective member 117 may be arranged in between the first face 107 and second face 108 of the light guide 20-24, for example, arranged on the inner side 110 thereof (Figs, lj-1), or arranged on the outer side 111 thereof (Fig.
  • each respective wavelength converting member 101 is sandwiched in between and in direct contact with the reflector 101 and reflective member 117, respectively, which arrangement is embedded within the core body 102 of the light-guide 24 (Fig In).
  • the arrangement of the reflector 100 and wavelength converting member 101 may vary as exemplified in the Figs. f-i).
  • the reflector may be arranged on the first side 104 of the wavelength converting member 101 such that a second side 105 thereof, opposite the first side 104, faces the reflective member 117 (Fig. lj), or the wavelength converting
  • a first wavelength converting member 101 may be arranged on the reflector 101 and a second wavelength converting member 101 may be arranged on the second reflectorl l7, such that the two wavelength converting members 101 face each other (Fig. 11).
  • each wavelength converting member may comprise a plurality of different wavelength converting materials of which each one may be configured to absorb and emit light, respectively, of any desirable wavelengths.
  • Fig. 2a shows a light-emitting device 200 according to one embodiment of the invention.
  • the light-emitting device 200 comprises the light-guide according to the invention and a light-source 201 arranged at an incoupling face 204 of the light-guide such that the received light may be guided in the light-guide by means of total internal reflection at the first 107 and second 108 face thereof.
  • the light-emitting device may advantageously comprise a reflective member 205 arranged along the longitudinal extend of the light-guide to reflect light that is outcoupled from the second face 108 of the light-guide.
  • light of a first wavelength which is emitted from the light- source 201 and guided in the light-guide, may be absorbed by the wavelength converting members 101 and emitted therefrom in such directions that at least a portion of the converted light is refracted through the second face 108 of the light-guide, that is, at least a portion of the light emitted directly from the wavelength converting member 101, or via a first reflection at the reflector 100, corresponds to an angle of incident at the second face 108 of the light-guide at which total internal reflection is not allowed (and so light is refracted through).
  • the refracted light is then reflected at the reflective member 205 back into the core body 102 of the light-guide such that light finally exits through the first face 107 thereof, i.e. in the direction of a viewer 1.
  • a viewer 1 looking at the first face 107 of the light- guide, which light-guide is comprised in the light-emitting device 200, can, on the one hand, observe the outcoupled light from the first face 107, but cannot, on the other hand, discern the light converting members 101 of the light-guide, and so from the viewer's point of view, i.e. from the first face 107, the light-guide will appear to have less color in ambient light, i.e. when light-source 201 is not operated.
  • Fig. 2b shows a light-emitting device 202 comprising the light-guide according to the invention and a plurality of light-sources 201 each being arranged between the first side 104 of a respective one of the wavelength converting members 101 and a respective one of the reflectors 100.
  • light of a first wavelength may be emitted by a plurality of light- sources 201 embedded in the core body 102 of the light- guide and configured such that a least a portion of the emitted light therefrom is either directly, or via a first reflection at the reflector 100, absorbed by the respective one of the wavelength converting members 101, which in turn emits light such that at least a portion is directly, or via a reflection at the reflective member 205, outcoupled from the first face 107 of the light-guide.
  • the plurality of light-sources 201 are arranged across the longitudinal extent of the light-guide, an even outcoupling of light from first face thereof may be achieved (without the need of guiding light therein through total internal reflection).
  • the light-source emits light of a first wavelength in the range of from 380 to 520 nm.
  • the light- sources of the light-emitting device may typically comprise at least one solid light source such as a LED or a laser, emitting light in the ultraviolet, violet and/or blue part of the spectrum.
  • the reflector 100 and the respective light-source 201 may either be arranged on the outer side 106 (Fig. 2b) or the inner side 109 (Fig. 2c) of the first face 107 of the light-guide.
  • the reflector 100 may be shaped as a dome 208, which may be arranged on the first side 104 of a respective one of the wavelength converting members 101 such that all light emitted from a respective one of the light- sources 201 enclosed therein must pass through the wavelength converting member 101 before being outcoupled from the light-guide. Thereby, increasing the amount of light of a first wavelength which is converted to a second wavelength by the wavelength converting members.
  • the reflective member 205 may be arranged directly on the outer surface 111 of the second face 108 of the light-guide as shown in Fig 2d, or as depicted in Figs. 2a-c, arranged at a distance therefrom.
  • a material 206 such as a polymeric material
  • the space between the second face 108 and the second reflector 205 may comprise of a gaseous atmosphere, for example, filled with air.
  • such material or medium 206 should have a lower refraction index compared to the core material 102 of the light-guide.
  • reflective member 205 may exhibit specular reflection or diffuse reflection, such as exhibiting Lambertian reflectance.
  • the first and the second wavelength converting material comprised in the wavelength converting members may be of any suitable luminescent materials comprising, for example, organic luminescent molecules such as perylene derivates including commercially available "Red F305", “Yellow F083” or “Yellow F170", “Orange F240", “Blue F650” and “Violet F570”, and/or inorganic luminescent materials such as YAG, LuAG, ECAS, BSSN, and/or quantum dots such as InP, CdSe, or any combinations thereof.
  • organic luminescent molecules such as perylene derivates including commercially available "Red F305", “Yellow F083” or “Yellow F170", “Orange F240", “Blue F650” and “Violet F570”
  • inorganic luminescent materials such as YAG, LuAG, ECAS, BSSN, and/or quantum dots such as InP, CdSe, or any combinations thereof.
  • the reflective member(s)/ reflector(s) may be of any suitable reflective material(s) including, for example, scattering materials comprising Ti0 2 and A1 2 0 3 particles, aluminum and silver reflective layers, and/or white polyethylene terephtalate (PET) in form of so-called microcellular reflective sheet (MCPET).
  • suitable reflective material(s) including, for example, scattering materials comprising Ti0 2 and A1 2 0 3 particles, aluminum and silver reflective layers, and/or white polyethylene terephtalate (PET) in form of so-called microcellular reflective sheet (MCPET).
  • the reflectivity of the reflective member(s)/ reflector(s) may be at least 60%, more preferably at least 80%, and most preferably at least 90%. However, it should be noted that a small amount of light may be transmitted through the reflective member(s)/ reflector(s).
  • the reflective member(s)/ reflector(s) may have a size in the range of from 1 ⁇ to 1 mm.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne un guide de lumière (10, 12-24) configuré de façon à guider la lumière par réflexion interne totale entre une première face (107) et une seconde face (108) du guide de lumière. Ce guide de lumière comprend une pluralité d'éléments convertisseurs de longueurs d'ondes (101), qui sont répartis sur l'ensemble dudit guide de lumière, et qui comprennent au moins une substance convertissant les longueurs d'ondes et configurée pour absorber la lumière d'une première longueur d'ondes et émettre vers la seconde face la lumière convertie en une seconde longueur d'ondes. Le guide de lumière comprend également une pluralité de réflecteurs (100, 112, 113, 114, 115) dont chacun est disposé d'un premier côté (104) de l'un desdits éléments convertisseurs de longueurs d'ondes (101) correspondant. Ladite première face tourne le dos à ladite seconde face (108) dudit guide de lumière, masquant ainsi lesdits éléments convertisseurs de longueurs d'ondes au regard d'un observateur (1) regardant vers ladite première face (107) dudit guide de lumière.
PCT/IB2012/051601 2011-04-07 2012-04-02 Guide de lumière à conversion de longueurs d'ondes Ceased WO2012137126A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11161513.4 2011-04-07
EP11161513 2011-04-07

Publications (1)

Publication Number Publication Date
WO2012137126A1 true WO2012137126A1 (fr) 2012-10-11

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Family Applications (1)

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PCT/IB2012/051601 Ceased WO2012137126A1 (fr) 2011-04-07 2012-04-02 Guide de lumière à conversion de longueurs d'ondes

Country Status (1)

Country Link
WO (1) WO2012137126A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3232240A1 (fr) * 2016-04-15 2017-10-18 LG Innotek Co., Ltd. Appareil électroluminescent et appareil d'éclairage le comprenant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100002414A1 (en) * 2005-06-07 2010-01-07 Noam Meir Illumination Apparatus and Methods of Forming the Same
WO2010052633A1 (fr) 2008-11-05 2010-05-14 Koninklijke Philips Electronics N.V. Guide de lumière avec éléments de couplage en sortie
EP2219056A1 (fr) * 2009-01-30 2010-08-18 Saint-Gobain Glass France Plaque dotée d'au moins un champ lumineux intégré

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100002414A1 (en) * 2005-06-07 2010-01-07 Noam Meir Illumination Apparatus and Methods of Forming the Same
WO2010052633A1 (fr) 2008-11-05 2010-05-14 Koninklijke Philips Electronics N.V. Guide de lumière avec éléments de couplage en sortie
EP2219056A1 (fr) * 2009-01-30 2010-08-18 Saint-Gobain Glass France Plaque dotée d'au moins un champ lumineux intégré

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3232240A1 (fr) * 2016-04-15 2017-10-18 LG Innotek Co., Ltd. Appareil électroluminescent et appareil d'éclairage le comprenant
US20170299798A1 (en) * 2016-04-15 2017-10-19 Lg Innotek Co., Ltd. Light-Emitting Apparatus and Illumination Apparatus Including the Same
KR20170118327A (ko) * 2016-04-15 2017-10-25 엘지이노텍 주식회사 발광 장치 및 이를 포함하는 조명 장치
CN107435834A (zh) * 2016-04-15 2017-12-05 Lg伊诺特有限公司 发光装置以及包含该发光装置的照明装置
US10551552B2 (en) 2016-04-15 2020-02-04 Lg Innotek Co., Ltd. Light-emitting apparatus and illumination apparatus including the same
KR102566497B1 (ko) * 2016-04-15 2023-08-16 엘지이노텍 주식회사 발광 장치 및 이를 포함하는 조명 장치

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