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WO2012136849A1 - Élément de conversion de couleur ainsi que lampe - Google Patents

Élément de conversion de couleur ainsi que lampe Download PDF

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Publication number
WO2012136849A1
WO2012136849A1 PCT/EP2012/056463 EP2012056463W WO2012136849A1 WO 2012136849 A1 WO2012136849 A1 WO 2012136849A1 EP 2012056463 W EP2012056463 W EP 2012056463W WO 2012136849 A1 WO2012136849 A1 WO 2012136849A1
Authority
WO
WIPO (PCT)
Prior art keywords
color conversion
conversion element
light
lamp
led
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/EP2012/056463
Other languages
German (de)
English (en)
Inventor
Franz Schrank
Stefan Tasch
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.)
Lumitech Produktion und Entwicklung GmbH
Original Assignee
Lumitech Produktion und Entwicklung GmbH
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 Lumitech Produktion und Entwicklung GmbH filed Critical Lumitech Produktion und Entwicklung GmbH
Priority to EP12720116.8A priority Critical patent/EP2705544A1/fr
Publication of WO2012136849A1 publication Critical patent/WO2012136849A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8514—Wavelength conversion means characterised by their shape, e.g. plate or foil
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732—Location after the connecting process
    • H01L2224/73251—Location after the connecting process on different surfaces
    • H01L2224/73265—Layer and wire connectors

Definitions

  • the present invention relates to a color conversion element, a lamp and a method for producing a color conversion element. More particularly, the invention relates to a color conversion element to be mounted over an LED and a lamp having a light emitting diode (LED).
  • LED light emitting diode
  • a by now typical light source is the light emitting diode (also luminescence diode), which is referred to herein for short as LED. It is a semiconductor electronic device in which light is emitted when current flows in the forward direction of the semiconductor. The wavelength of the light depends essentially on the semiconductor material and the selected doping.
  • white light is understood as meaning a mixture of light beams of different wavelengths, whereby light components from both the red, the green, and the blue spectrum are included.
  • a classical method is the additive mixture of the three basic colors red, green and blue. At least three LEDs are needed to produce such light.
  • an LED is used which emits ultraviolet radiation. The ultraviolet radiation is transformed into the visible spectrum with the help of phosphors in the colors blue, green and red.
  • the complete conversion of the UV radiation into visible light succeeds only with relatively large losses, so that such a light regularly has the disadvantage of a low efficiency.
  • Another method of producing white light is made using LEDs emitting in the blue spectral range. The LEDs are surrounded by color conversion phosphors, which convert the blue light proportionately into red and / or green light. This transfer takes place with substances that are excited by blue light, and include in their emission spectrum non-blue visible light. Color conversion in the sense used herein should therefore not be confused with the effect of absorption in which light rays of certain wavelengths are merely filtered out.
  • Fig. 1 shows a known from the prior art chip, in which on the circuit board 12, for example. Via a conductive adhesive 16, the LED 17 is applied, electrically via the pads 13 and 15 and the bonding wire 14 (respectively only numbered on the left side) is connected to the circuit board.
  • This arrangement is embedded in a potting compound 10 with dispersed color conversion phosphors.
  • the color conversion phosphors cause the partial conversion of the blue light into red and green light.
  • a color conversion element for use in an LED lamp comprising a carrier material having a first refractive index and a color conversion illuminant, wherein the color conversion element has substantially the shape of a hollow cylinder or hollow polyhedron.
  • the light-generating unit the LED
  • the LED is not embedded in a material that comprises color conversion illuminants.
  • a hollow cylinder or hollow polyhedron is placed over it.
  • color conversion and scattering in one element and at a certain distance from the LED can be performed much more effectively. It is achieved an improved light mixture.
  • the proportion of scattering agent can reduce the layer thicknesses in the element as well as the concentration of color conversion phosphors. This leads to a not insignificant reduction of costs, essentially achieved by the saving of the sometimes very expensive color conversion phosphors.
  • a color conversion element typically consists of a carrier material that is regularly transparent. Typical substances are acrylates, polycarbonates, silicones or epoxides. Furthermore, the color conversion element comprises a color conversion phosphor.
  • the term "color conversion luminescent substance” or “color conversion luminescent material” refers to a substance which completely or partially absorbs the light emitted by the LED (so-called “primary light”) and emits the supplied energy as light of a different wavelength.
  • the color conversion element contains at least one color conversion material. Typically, it contains a mixture of at least two color conversion materials.
  • the conversion materials which can be used include, in particular, silicates (for example BOSE), aluminates, nitrides and / or garnet phosphors such as, for example, yttrium aluminum garnet (YAG), terbium aluminum garnet, and lutetium aluminum garnet (LuAG).
  • silicates for example BOSE
  • aluminates nitrides and / or garnet phosphors
  • YAG yttrium aluminum garnet
  • terbium aluminum garnet terbium aluminum garnet
  • LuAG lutetium aluminum garnet
  • the color conversion element comprises light-scattering additives.
  • the light-scattering additives can be designed to break the light.
  • additives are possible, which are based primarily on the effect of total reflection, with the total reflection is only a scattering, but no refraction of the light rays.
  • To be there- Bringing of light-diffusing additives allows a high efficiency of color conversion and a uniform illumination by the LED.
  • the light-diffusing elements comprise one or more of the following materials: silica, barium sulfate, calcium carbonate, magnesium hydroxide, zinc oxide, barium titanate, and / or alumina. Preference is given to spherical silica having an average particle size of at least 0.5 ⁇ m.
  • an LED lamp having an LED chip and a color conversion element described herein, wherein the color conversion element is disposed over the LED chip.
  • An LED lamp is e.g. a set up for replacement bulbs, which can be inserted into the socket or on the holder of a lamp. This is done, for example, by simple insertion, by combined insertion and rotation, or by turning.
  • the term "luminaire” includes the socket or fixture for the lamp or bulb, and is understood to mean that the LED bulb or lamp may or may not be mounted therein or more typically
  • a luminaire has regular cables or connecting contacts for connection to the electrical network, and the luminaire also regularly contains attached electronics, for example for controlling the luminaire or for converting the mains voltage into the required voltage.
  • the LED lamp typically includes a socket portion intended to be received in the socket of a luminaire, the semiconductor required for light generation, and possibly further elements such as a mirror coating attached to the semiconductor, the so-called reflector, and / or at least one protective glass.
  • An LED chip is understood herein to be a semiconductor chip that is designed to function as a light-emitting diode. According to various embodiments, an LED chip emitting in the blue spectral range is provided (“blue LED chip”), but it is also possible for the color conversion element to have both a blue and a blue color. LED chip, or surrounds both a blue, as well as a red and green LED chip. According to other embodiments, the LED chip is an ultraviolet emitting chip.
  • a color conversion element typically a color conversion molded body
  • the lateral distance to the one or more LEDs is typically between 0.5 and 5 mm, in particular between 1 and 3 mm.
  • the shape of the body is essentially a hollow cylinder or a hollow polyhedron, in particular a hollow cube.
  • Typical dimensions of the color conversion selements are, for example in the case of the hollow cylinder, a height that corresponds to half to double the diameter (in the case of a round LED) or half to double the side length (in the case of a square LED) of the radiating LED's.
  • the arrangement of a plurality of LEDs can also be made rather round with a larger number of LEDs.
  • the three-dimensional shape of the hollow cylinder also results in a correspondingly large surface, which contributes to the cooling of the color conversion element and thus of the color conversion material.
  • shaped bodies in particular shaped spheres, are used as light-scattering elements.
  • the moldings in particular moldballs, are typically of a transparent, preferably inorganic material, and may for example consist of undoped yttrium-aluminum garnet, glass or amorphous silicon dioxide (silica). Preference is given to spherical silica with particle sizes of at least 0.5 ⁇ m.
  • the color conversion luminescent material and / or the light-scattering additives are distributed in the carrier material of the color conversion element, wherein the distribution is preferably made homogeneous.
  • the color conversion element is typically disposed over the LED chip.
  • the part passing through the color conversion element and partly in the color conversion element comprises converted radiation fractions from the red (herein understood as between 580 and 800 nm), the green (herein understood as between 500 and 580 nm), and the blue spectral region (herein understood as between 400 and 500 nm).
  • the use of moldings leads to low-loss scattering elements which scatter and reflect the light emitted by the LED within the color conversion element.
  • the average optical path length of light beams within the color conversion element can be increased.
  • the density of color conversion phosphors in the support material can be reduced to a corresponding extent, yet the emitted light rays have undergone the desired partial conversion.
  • the amount of color conversion phosphors could be reduced by about 10%. Since the color conversion phosphors are a significant cost driver in the production of the desired, usually white light, therefore, the material costs in the production of color conversion elements can be substantially reduced.
  • the thermal expansion coefficient and the thermal conductivity in the color conversion element can be increased.
  • An increase in the thermal conductivity is achieved by the introduction of inorganic moldings, which are also typically transparent. This admixture makes it possible to keep the temperature within the color conversion element more constant. The heat transport to the surface is also improved, local hotspots are effectively avoided. In this way, the coefficient of thermal expansion of the molded part is lowered, which in turn can reduce mechanical stresses in temperature fluctuations.
  • the shaped bodies are typically chosen such that the refractive index of the shaped body material is different from the refractive index of the surrounding material of the color conversion element.
  • the refractive index of the shaped body material is less than the refractive index of the surrounding material of the carrier material.
  • the refractive index of the material used in the moldings is less than 1.5, while the support material of the color conversion element has a refractive index of 1.5 or more.
  • the effect of total reflection occurs at the interface of two transparent media when light comes from an optically denser medium with a refractive index nl, and falls on the interface to an optically thinner medium with refractive index n2. From a certain limit angle, which can be determined via Snell's law of refraction, the light at the interface is not refracted, but completely reflected. In total reflection, the energy, the amplitude and the wavelength of the light beam remain unchanged.
  • the size of the shaped body is typically between 0.5 and 50 ⁇ , preferably between 2 and 20 ⁇ , said dimensions in the case of non-spherical rectangular shaped body on the longest side dimensions, in the case of elliptical shaped body on the large axis, and in the case of spherical shaped bodies on the diameter.
  • the volume fraction of moldings within the color conversion element is up to 35%, typically up to 20%, but at least 5%.
  • the LED illuminant is a blue light emitting diode.
  • the combination of at least one blue LED with the described color conversion elements allows a high color accuracy without binding, outstanding color rendering values and a high degree of design space of the desired emission spectrum.
  • different colored LEDs can be arranged, which, for example.
  • white light can be mixed.
  • the use of the shaped spheres as light-scattering additives in principle allows an advantageous application of the mixture of blue LEDs with red LEDs.
  • the low proportion of color conversion phosphors required by the use of the shaped bodies also leads to a reduced absorption for the red wavelength range, which improves the overall efficiency of the luminaire.
  • its surface can be structured, as in the simplest case by roughening.
  • the color conversion element may have a structured surface, in particular with microprisms or with a roughening.
  • a structured surface is understood in particular to mean that the surface of the color conversion element is provided with recesses and / or protrusions, which typically have dimensions in the microscopic range (ie smaller than 5 ⁇ m), additionally or alternatively may also have non-microscopic (ie greater than 5 ⁇ ) dimensions in the range less than 1/10 - 1/5 mm.
  • the structures can be regular or irregular.
  • the surface can z. B. be increased by the use of micro-prisms mounted on the surface by a multiple. Thus, a much improved transport of the heat to the ambient air can be ensured, whereby the operating temperature of the color conversion element can be additionally lowered.
  • a structuring of the surface does not impair the emission characteristic.
  • a lamp illustrated herein are particularly suitable for being combined with a reflector so as to produce a homogeneous white-illuminated radiation. Alternatively, this can also be realized with lenses.
  • an emission in the pole of the reflector can be achieved, whereby the color homogeneity on the solid angle of the radiation can be further improved.
  • the color conversion element regularly has a non-white, typically yellowish, body color.
  • a coating applied to the color conversion element for example in white.
  • the white appearance of the color conversion element is regularly preferred by consumers.
  • the coating may be designed so that the efficiency of the color conversion element remains virtually unimpaired, ie, that the white layer makes little absorption (ie, ⁇ 10%) of the light passing through it.
  • Typical layer thicknesses are in the range of less than 500 ⁇ , more preferably less than 100 ⁇ .
  • the efficiency (understood as emitted light power in the visible spectrum in relation to the radiation power of the blue LED used, in particular without correction of the Stoke shift) of the embodiments described, without additional white coating, in comparison to prior art solutions to 5% to 10% increased.
  • the surface used for heat dissipation is also in a favorable ratio compared to the material volume of the color conversion element.
  • the known in the prior art spherical color conversion elements may have advantages in the lighter production, but they have a more unfavorable heat dissipation surface to volume ratio. The reduced heat generation and better heat dissipation reduces the operating temperature compared to a prior art design, and therefore can lead to increased life.
  • a retrofit LED lamp as understood herein, has a shape identical to or similar to a glass bulb of a light bulb, as known in the art and used in homes for decades.
  • the embodiment with an additional white coating can be used favorably for the production of such lamps, because the usual white appearance of consumers is preferred.
  • the otherwise often chosen solution of a diffuser in the shape of the lamp envelope over the color conversion element is improved both in terms of complexity and in terms of efficiency.
  • Fig. 1 is a schematic longitudinal section through an LED chip known from the prior art.
  • FIGS 2-8 are schematic longitudinal sections through color conversion elements according to embodiments of the present invention.
  • FIGS 9 and 10 are schematic longitudinal sections through LED lamps according to embodiments of the present invention.
  • FIG. 2 shows schematically a longitudinal section through an embodiment of a color conversion element, in which the color conversion element 20 has the shape of a hollow cylinder which is designed with a lateral wall 21 and an upper part 22.
  • the color conversion element typically consists of a transparent carrier material and incorporated color conversion luminescent material.
  • the color conversion phosphor is normally homogeneously distributed in the carrier material, and was not separately quantified in the figures.
  • FIG. 3 shows schematically an embodiment of a color conversion element in which the color conversion element 20 has a substantially cylindrical shape.
  • the color conversion element 20 has a substantially cylindrical shape.
  • a hollow cylinder or hollow polyhedron described herein regularly has a flat upper portion 38 which allows direct radiation into the room to be illuminated.
  • the flat upper portion is arranged centrally in the lamp, provided that a reflector is present, also mostly in the center of the reflector.
  • the color conversion element may be at least partially mirrored.
  • a reflective coating can be provided in particular in the flat upper area. The mirroring improves the color homogeneity over the solid angle of the radiation.
  • the hollow cylinder-like shape has side walls 21, which typically have a maximum deviation of 20 ° compared to the pure circular cylinder.
  • Hollow cylinder-like shapes typically have a circular base area with a radius r.
  • the ratio of the surface area to the volume of the cylinder-like shape is always greater than 3 / 2r, more preferably 5 / 3r, according to one aspect of the invention.
  • the ratio of the inner diameter of the hollow cylinder to the height of the hollow cylinder is approximately 1: 1.
  • the color conversion element can also be present in a polyhedral shape, in particular a cube shape.
  • the longitudinal sections shown herein apply accordingly to the longitudinal sections of a polyhedron or a polyhedron-like shape.
  • the term "substantially polyhedron-shaped" is intended in particular to include deviations at the polyhedron corners in comparison to the mathematically defined polyhedron (see, for example, FIG. 3).
  • FIG. 4 shows schematically an embodiment of a color conversion element in which the color conversion element 20 is provided with shaped bodies 40.
  • the shaped bodies are typically shaped spheres having a lower refractive index than the refractive index of the carrier material 45.
  • FIG. 5 schematically shows an embodiment of a color conversion element in which the outside of the color conversion element 20 is provided with structurings 30 pointing outwards (for example microprisms).
  • the structuring can, in general and not only in this embodiment, in the longitudinal section in the form of polygons, in particular triangles have. In three-dimensional view, the structurings may be pyramidal in particular.
  • FIG. 6 shows schematically an embodiment of a color conversion element, in which the color conversion element 20 is provided both with moldings 40 and also has a structured surface 30.
  • FIG. 7 schematically shows an embodiment of a color conversion element, in which the color conversion element 20 essentially has the form of the hollow cylinder or hollow polyhedra already schematized in FIG. 3, and is additionally provided with shaped bodies 40. According to embodiments not shown, the embodiment shown in FIG. 7 has a structured surface. Visible is also in turn the flat upper portion 38.
  • FIG. 8 illustrates, on the basis of the shown example of the hollow cylinder or polyhedron, the possibility existing in all embodiments of providing the outer surface of the color conversion element with a coating 90.
  • the coating can be used be white and thus be perceived by consumers as more beautiful than, for example, a yellow color due to the introduced color conversion phosphors.
  • the embodiments which have a structuring may also be provided with a coating.
  • FIG. 9 shows a schematic longitudinal section through an exemplary LED lamp 100.
  • the color conversion element 20, which may correspond to a color conversion element discussed herein, is mounted over the LED chip 75. Furthermore, the optional embedding of the LED chip 75 in a nearly spherical potting compound 72 is shown, which essentially serves to protect the semiconductor and its connection wires.
  • the schematically illustrated reflector 70 surrounds the color conversion element 20, and serves to deflect laterally emitted light upward (in the illustration shown).
  • the reflector is regularly higher than the color conversion element.
  • the maximum height of the color conversion element corresponds approximately to the height of the reflector. In preferred embodiments, the height of the color conversion element is less than 50% of the height of the reflector.
  • the outer dimensions of the color conversion element are co-determined by the shape of the reflector.
  • the wall thickness of the color conversion element is a function of the color conversion luminescent material used, the content of the luminescent material, the nature of the light-scattering additives, the amount of light-scattering additives, and the desired degree of conversion (i.e., which portions of the primary radiation are to be re-emitted). Typical wall thicknesses are between 1.0 and 3.0 mm.
  • the embodiments of the present invention illustrated by FIG. 10 differ from the embodiments illustrated in FIG. 9 in that the color conversion element is provided with shaped bodies, in the present case shaped spheres.
  • the radiated spectrum does not include (ie, below 0.2%) ultraviolet radiation.
  • the proportion radiated in the infrared spectral range is very low, typically less than 0.5% based on the total emitted energy.

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  • Led Device Packages (AREA)

Abstract

L'invention concerne un élément de conversion de couleur (20) à utiliser dans une lampe à DEL ou un éclairage à DEL, comprenant un matériau de support ayant un premier indice de réfraction, un moyen d'éclairage à conversion de couleur et une pluralité de corps moulés (40), l'élément de conversion de couleur présentant pratiquement la forme d'un cylindre creux ou d'un polyèdre creux. L'invention concerne également une lampe et un éclairage qui présentent un tel élément de conversion de couleur.
PCT/EP2012/056463 2011-04-08 2012-04-10 Élément de conversion de couleur ainsi que lampe Ceased WO2012136849A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12720116.8A EP2705544A1 (fr) 2011-04-08 2012-04-10 Élément de conversion de couleur ainsi que lampe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011001928.6 2011-04-08
DE102011001928A DE102011001928A1 (de) 2011-04-08 2011-04-08 Farbkonversionselement sowie Lampe

Publications (1)

Publication Number Publication Date
WO2012136849A1 true WO2012136849A1 (fr) 2012-10-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/056463 Ceased WO2012136849A1 (fr) 2011-04-08 2012-04-10 Élément de conversion de couleur ainsi que lampe

Country Status (3)

Country Link
EP (1) EP2705544A1 (fr)
DE (1) DE102011001928A1 (fr)
WO (1) WO2012136849A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2629006A1 (fr) * 2012-02-17 2013-08-21 Mattel Inc. Diode électroluminescente et jouet
DE102015208462A1 (de) * 2015-05-07 2016-11-10 Osram Gmbh Beleuchtungsvorrichtung

Citations (4)

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US20030141563A1 (en) * 2002-01-28 2003-07-31 Bily Wang Light emitting diode package with fluorescent cover
US20070194709A1 (en) * 2003-01-10 2007-08-23 Toyoda Gosei Co., Ltd. Light emitting device
EP1988583A1 (fr) * 2007-04-30 2008-11-05 TridonicAtco Optoelectronics GMBH Module DEL doté d'une couche de conversion de couleur conçue pour une distribution homogène des couleurs
WO2009119034A1 (fr) * 2008-03-26 2009-10-01 Panasonic Corporation Dispositif émetteur de lumière à semiconducteur

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DE19625622A1 (de) * 1996-06-26 1998-01-02 Siemens Ag Lichtabstrahlendes Halbleiterbauelement mit Lumineszenzkonversionselement
DE102004004947A1 (de) * 2004-01-31 2005-08-18 Signal-Construct Elektro-Optische Anzeigen Und Systeme Gmbh LED-Leuchtkörper
DE102008022830A1 (de) * 2007-11-30 2009-06-04 Osram Opto Semiconductors Gmbh Strahlungsemittierendes Bauelement
DE102008012407A1 (de) * 2008-01-31 2009-08-06 Osram Opto Semiconductors Gmbh Strahlungsemittierende Vorrichtung
DE102008061032A1 (de) * 2008-12-08 2010-06-10 Osram Opto Semiconductors Gmbh Beleuchtungseinrichtung
EP2378575A1 (fr) * 2010-04-19 2011-10-19 EMPA Eidgenössische Materialprüfungs- und Forschungsanstalt Elément optique, notamment destiné à la modification de la lumière émise par une source lumineuse à DEL et son procédé de fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030141563A1 (en) * 2002-01-28 2003-07-31 Bily Wang Light emitting diode package with fluorescent cover
US20070194709A1 (en) * 2003-01-10 2007-08-23 Toyoda Gosei Co., Ltd. Light emitting device
EP1988583A1 (fr) * 2007-04-30 2008-11-05 TridonicAtco Optoelectronics GMBH Module DEL doté d'une couche de conversion de couleur conçue pour une distribution homogène des couleurs
WO2009119034A1 (fr) * 2008-03-26 2009-10-01 Panasonic Corporation Dispositif émetteur de lumière à semiconducteur

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EP2705544A1 (fr) 2014-03-12
DE102011001928A1 (de) 2012-10-11

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