US20170130930A1 - Nearly Index-Matched Luminescent Glass-Phosphor Composites for Photonic Applications - Google Patents
Nearly Index-Matched Luminescent Glass-Phosphor Composites for Photonic Applications Download PDFInfo
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- US20170130930A1 US20170130930A1 US15/236,127 US201615236127A US2017130930A1 US 20170130930 A1 US20170130930 A1 US 20170130930A1 US 201615236127 A US201615236127 A US 201615236127A US 2017130930 A1 US2017130930 A1 US 2017130930A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
- F21V3/08—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material comprising photoluminescent substances
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- F21V3/0463—
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/07—Glass compositions containing silica with less than 40% silica by weight containing lead
- C03C3/072—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron
- C03C3/074—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron containing zinc
- C03C3/0745—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron containing zinc containing more than 50% lead oxide, by weight
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/12—Compositions for glass with special properties for luminescent glass; for fluorescent glass
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
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- 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
- F21K9/66—Details of globes or covers forming part of the light source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
- F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
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- F21V3/0418—
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
- F21V3/061—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being glass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/10—Refractors for light sources comprising photoluminescent material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
- F21V7/05—Optical design plane
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
- H05B33/145—Arrangements of the electroluminescent material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2204/00—Glasses, glazes or enamels with special properties
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- 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
- F21Y2115/10—Light-emitting diodes [LED]
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- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
Definitions
- the present invention relates generally to the field of solid-state lighting and more specifically to high efficiency phosphor-converted LEDs.
- SSL Solid-state lighting
- a primary advantage of SSL over conventional lighting technologies is the potential energy savings as a result of its higher luminous efficiencies over conventional lighting devices.
- SSL is capable of 50% efficiency with 200 lumen per watt (lm/W) efficacy (compared to 15 lm/W for incandescents and 60-90 lm/W for fluorescents) and up to 100 khr lifetimes. This is approximately 100 times the lifetime of conventional incandescent bulbs and 10 times the lifetime of fluorescents.
- DOE Department of Energy
- the Department of Energy (DOE) has set a goal of 50% electrical-to-optical system efficiency with a spectrum accurately reproducing the solar spectrum by 2020.
- the Optoelectronic Industry Development Association (OIDA) aims for 200-hm/W luminous efficiency with a color rendering index greater than 80.
- SSL devices primarily include light emitting diodes (LEDs), which include a small chip semiconductor, i.e. the LED source, mounted in a reflector cup on a lead frame.
- the LED source generates photons of light at a first wavelength when energized.
- the reflector cup reflects photons out of the LED.
- An optic generally a silicone or epoxy encapsulation, aids in light extraction from the LED source and protects the LED components.
- High efficiency generation of white light with LEDs has conventionally been according to one of three methods: 1) color mixing; 2) wavelength conversion; or 3) a combination of methods 1 and 2.
- Color mixing is the use of multiple LEDs across the visible spectrum (e.g. blue+green+red LEDs), which combine to produce a white light.
- Wavelength conversion is the use of a single, efficient, short wavelength LED emitting light at the first wavelength, which is then at least partially absorbed by a phosphor within the LED and re-emitted at a second wavelength.
- LEDs under method 2 are generally referred to as phosphor-converted LEDs (pcLEDs).
- the phosphor can encompass the LED source of the LED.
- the phosphor is typically a YAG:Ce crystalline powder in direct contact with the blue wavelength emitting LED source. Both are positioned upon a heat sink base and surrounded by an optic.
- the other arrangement is a scattered photon extraction (SPE) pcLED, which positions a planar phosphor-layer at a distance away from the LED source.
- SPE scattered photon extraction
- the YAG:Ce phosphor in powder form, creates a diffuse, semitransparent layer upon an acrylic optic with a planar surface.
- the phosphor When the phosphor is in direct contact with the LED source, the phosphor suffers from optical losses by reflection of phosphor-emission back into the LED source rather than through the optic and out of the LED. This can account for up to 60% of the total phosphor emission.
- the SPE pcLED suffers from scattering of the phosphor emissions. Scattering is the result of substantial differences in the indices of refraction of the phosphor powder and the material that encapsulates the phosphor (air, silicon, PMMA, or glass).
- phosphor-related deficiencies are then compounded by secondary losses encountered by other package design deficiencies, such as imperfections of the reflector cup within the LED. While the reflector cup is intended to direct the phosphor-emission out of the LED, internal reflections and path randomization can trap a portion of the phosphor-emission, such as between the reflector cup and the phosphor, and decrease LED efficiency by approximately 30%.
- the light emitting composite material includes a glassy material and a plurality of phosphor particles suspended within the glassy material, wherein the refractive index of the plurality of phosphor particles is approximately equal to the refractive index of the glassy material.
- an inorganic crystalline material selected from the group consisting of Y x Gd y Al v Ga w O 12 O:M 3+
- the glassy material can be an optical glass comprising an amount from 5% to about 35% of SiO 2 ; an amount from about 55% to about 88% of PbO; optionally an amount less than 10% B 2 O 3 ; optionally a combined amount less than 8% of Na 2 O and K 2 O; and optionally a combined amount less than about 15% total of TiO 2 , ZrO 2 , La 2 O 3 , ZnO, and BaO.
- the glassy material can be an optical glass comprising an amount from about 21% to about 30% of TIO 2 ; an amount from about 30% to about 50% of BaO, NaO, BeO, CaO, SrO, CdO, Ga 2 O 3 , In 2 O 3 , or Y 2 O 3 ; an amount from about 18% to about 24% of Al 2 O 3 ; and an amount from about 1% to about 10% of SiO 2 , B 2 O 3 , PbO, GeO 2 , SnO 2 , ZrO 2 , HfO 2 , or ThO 2 .
- the light emitting composites of the present invention can be used within a phosphor-containing light emitting device (pcLED).
- pcLED phosphor-containing light emitting device
- the pcLED can be constructed as an Enhanced Light Extraction by Internal Reflection (ELIXIR) LED device.
- ELIXIR Enhanced Light Extraction by Internal Reflection
- the light emitting composite can be used with a solid-state laser.
- the light emitting composite can be used as a luminescence collector.
- FIG. 1 is a diagrammatic cross-sectional view of the ELIXIR LED device according an embodiment of the present invention.
- FIG. 2 is a sample spectrum demonstrating the LED source emission band, the phosphor absorption band, and the phosphor emission band.
- FIG. 3 is a diagrammatic cross-sectional view of the ELIXIR LED device according to another embodiment of the present invention.
- FIG. 4 is an enlarged diagrammatic cross-sectional view of a nearly-indexed matched luminescent glass crystal composite.
- FIG. 5A is a diagrammatic cross-sectional view of the total internal reflections within a conventional pcLED device.
- FIG. 5B is a diagrammatic cross-sectional view that illustrates the relation between the relative radii of first and second materials, which leads to total internal reflection.
- FIG. 6 is a diagrammatic view of a conventional pumped solid-state laser device.
- FIG. 7 is a diagrammatic view of a pumped solid-state laser device according to an embodiment of the present invention.
- FIG. 8 is a diagrammatic view of a luminescence collector according to an embodiment of the present invention.
- FIG. 9 is a diagrammatic cross-sectional view of the result of a ray trace diagram for the ELIXIR LED device according to one embodiment of the present invention.
- ⁇ pcL ⁇ LED ⁇ s ⁇ q ⁇ p Equation 1
- ⁇ pcL is the total pcLED efficiency and is dependent upon the efficiency of the particular LED source, ⁇ LED ;
- the Stokes conversion efficiency, ⁇ s is, which is the quantum ratio of the average emission wavelengths of the LED and the phosphor;
- the phosphor quantum efficiency, ⁇ q which indicates the efficiency of the quantum conversion of light from a first wavelength to a second wavelength inside the phosphor;
- the package efficiency, ⁇ p which is the efficiency of light extraction of LED- and phosphor-emitted photons from the LED device package.
- CE conversion efficiency
- Package efficiency, ⁇ p of the present invention is improved over conventional LED devices by first separating an LED source 12 from first and second non-planar layers, wherein the second layer is composed of a phosphor 14 , which will nearly eliminate the reflection of phosphor- and LED-emissions back into the LED source 12 . Secondly, a planar reflector 16 is used to reduce the number of mirror reflections over the conventional LED. The result is an Enhanced Light eXtraction by Internal Reflection (ELIXIR) LED device 10 , shown in FIG. 1 .
- ELIXIR Enhanced Light eXtraction by Internal Reflection
- the ELIXIR LED 10 more specifically includes the first non-planar layer, i.e. a glass cover 18 , surrounding and making immediate contact with the second non-planar layer, i.e. a phosphor 14 , and a LED source 12 upon a heat sink base 20 .
- the phosphor 14 and the LED source 12 are separated by a radius sufficient to substantially reduce the likelihood of phosphor-emissions reentering the LED source 12 . This distance, r, is dependent upon a specified fraction of reentry, P, and is given by:
- A is the size of the LED source 12 , i.e. the surface area of the LED chip.
- the high package efficiency is maintained as long as the proportions of the ELIXIR LED 10 , namely the r phosphor /r optic ratio, are preserved, as described below in connection with FIG. 5B .
- the ELIXIR LED 10 size is ultimately limited by the size of the LED source 12 .
- the distance to the phosphor 14 from the LED source 12 must be sufficiently long so that only a small fraction of converted light re-enters the LED source 12 , where high losses occur.
- a typical power LED chip has an area of ⁇ 1 mm 2 .
- a minimum LED source 12 to phosphor 14 separation of approximately ⁇ 1 mm 2 /(4 ⁇ (0.01)), or ⁇ 2.8 mm is obtained.
- the minimum ELIXIR LED 10 diameter would be four times this value, ⁇ 1.1 cm, which is approaching the size of the transparent lens encapsulation and smaller than the heat sink diameter on a typical power LED.
- the LED source 12 can include any conventional resonance cavity LED or laser diode source generally emitting a light having a first wavelength ranging between about 350 nm to about 500 nm. This can include, but should not be limited to, a blue power LED with a peak wavelength of 455 nm with a 1000 mA DC drive capability.
- the glass cover 18 can be any material suitable for the lens construction and for protection of the phosphor 14 and LED source 12 , such as polymethyl methacrylate (PMMA) silicones, and glasses. In an alternative embodiment described herein, the glass cover 18 and the phosphor 14 may be made integral.
- PMMA polymethyl methacrylate
- the phosphor 14 is applied to the glass cover 18 as a layer of inorganic phosphor crystalline powder.
- the phosphor 14 can be applied as a layer, for example, of about 100 ⁇ m in thickness, to an inner surface of the glass cover 18 from a solution of acetone or other solvent.
- the phosphor 14 should be selected such that the phosphor absorption band substantially overlaps with the LED-emission band, as shown in FIG. 2 . This ensures efficient transfer from the first wavelength, the LED-emission, to the second wavelength, the phosphor-emission.
- a suitable phosphor for use with the blue power LED source can be Johnson Polymer Joncryl 587 modified styrene acrylic with 0.2% BASF Lumogen F Yellow 083 fluorescent dye.
- the glass cover 18 can be eliminated and the phosphor 14 is applied as a layer upon the inside radius of a hemispherical optic 22 .
- the shape should not be considered so limited. That is, the shape can include hemispheres (see FIG. 1 ), ellipsoids, spheres 24 (see FIG. 3 ), or other similar shapes as is desired or necessary.
- the phosphor 26 , glass cover 28 , and optic 30 will include an opening 34 for electrical connections 36 and support 38 to the LED source 32 . While not necessary, the opening 34 should be small in construction to further minimize emission losses.
- the phosphor 14 and glass cover 18 are replaced with a light emitting composite material 40 of FIG. 4 .
- the light emitting composite material 40 integrates the first and second non-planar layers as an inorganic crystalline 42 suspended in a glassy material 44 matrix as illustrated in FIG. 4 .
- the inorganic crystalline 42 and glassy material 44 are selected such that, n c , the index of refraction of the inorganic crystalline 42 is approximately equal, n g , to the index of refraction of the glassy material 44 .
- the result is a nearly index-matched luminescent glass-crystal composite (NIMLGCC) 40 that maximizes the quantum efficiency of the phosphor by reducing, or eliminating, optical scattering.
- NMLGCC near index-matched luminescent glass-crystal composite
- the inorganic crystalline 42 should be a particle 46 that is larger than about 10 nm, i.e. not a nanoparticle. However, because the light-emitting composite material 40 has a finite thickness, the inorganic crystalline 42 should be smaller than the thickness of the light-emitting composite material 40 .
- the light-emitting composite material 40 may comprise a combination of different inorganic crystallines 42 to obtain a color mixing result of broadband white light emission.
- two or more UV- or violet-short wavelength inorganic crystalline materials 42 in the 350 nm to 430 nm range will absorb the first wavelength from the LED source 12 and reemit a combination of red, green, and blue light to achieve a broadband white.
- the broadband white resulting from a color-mixing light-emitting composite 40 is more highly uniform as compared to conventional phosphor color mixing because the emissions of red, green, and blue originate from the same location.
- blue or blue-green short wavelength LED sources 12 are used (430 nm to 500 nm)
- these inorganic crystalline materials 42 will reemit the first wavelength in combination with red and green light to achieve a broadband white.
- the glassy material 44 in which the inorganic crystalline material is suspended can include an optical glass or other glass material, such as those manufactured by Schott North America (Elmsford, N.Y.) including SF-57, SF-67, LASF-9. LASRP47, SK-57. PK-51, PK-53, FK-51A, and FK-5.
- Other optical glasses can include those according to the teachings of U.S. Appl. No. 2005/0075234 or U.S. Pat. No. 3,960,579, which are hereby incorporated by reference, in their entirety.
- the glassy material 44 can comprise about 10% to about 99.9% of the light emitting composite material 40 by weight.
- the selection of an inorganic crystalline 42 and glassy material 44 should be according to index-matching. That is, the index of refraction, n c , of the inorganic crystalline 42 should be approximately equal to the index of refraction, n g , of the glassy material to provide an index of refraction, nz, for the light-emitting composite material 40 .
- Total internal reflections occur when the interface between first and second material 52 , 54 cannot be traversed by light, as illustrated with a conventional LED device 50 in FIG. 5A .
- This condition at the interface occurs when the refractive index of the first material 52 (here the phosphor) is greater than the refractive index of the second material 54 .
- the light cannot traverse the interface, but will either refract along the interface or undergo total internal reflection.
- Total internal reflection of the emission 58 continues until all of the energy in the emission is reabsorbed 60 by the phosphor.
- FIG. 5B shows a hemispherical optic 22 having an internal radius, r, and an outer radius, R.
- phosphor 14 (which includes, e.g. the light-emitting composite material 40 ) is located at the internal radius r of the optic 22 .
- the optic 22 is constructed from the same transparent material as a host material of the phosphor 14 (e.g. the host material 44 of the light-emitting composite material 40 .) In this manner, a refractive index n 2 of the optic 22 is equal to or larger than the refractive index of the phosphor 14 .
- a refractive index of the medium that surrounds the optic 22 is n 1 .
- Snell's Law can be used to calculate a configuration of the optic 22 for which total internal reflections are eliminated inside the optic 22 .
- This configuration is determinable by establishing a ratio of a radius to the phosphor 14 (which includes, e.g. the light-emitting composite material 40 ), r, to a radius to the outer diameter of the optic 22 , R.
- This ratio of radii must be less than or equal to the ratio of the index of refraction for material external to the optic 22 (and, hence, external to the ELIXIR LED device 10 ), n 1 , and n 2 :
- total internal reflection inside the optic 22 will be avoided when r/R is less than the inverse of n 2 .
- the ELIXIR LED 10 of FIG. 9 includes a planar reflector 16 , an LED source 12 protruding through the planar reflector 16 , a phosphor 14 —in this case including the light-emitting composite material 40 —and an optic 22 .
- the phosphor 14 is spaced apart from the LED source 12 , such that an enclosure formed by the phosphor 14 and the planar reflector 16 encloses the LED source 12 .
- the phosphor 14 and the optic 22 are coupled together and positioned upon the planar reflector 16 as provided by Equation 3.
- Materials for the planar reflector 16 can include aluminized Mylar attached to an acrylic sheet or a 3M Vikuiti enhanced specular reflector film. By eliminating the reflector cup of conventional, LED package design, phosphor-emission can leave the ELIXIR LED 10 without being trapped between the planar reflector 16 and the phosphor 14 .
- the optic 22 positioned externally to the light-emitting composite material 40 can be constructed of a glass material similar to the glassy material 44 of the light-emitting composite material 40 .
- Other materials can also be used so long as refractive index of the optic 22 is greater than or equal to n 2 .
- Suitable materials for the optic 22 construction can be polymethyl methacrylate (PMMA), silicones, and glasses having refractive indices of about 1.3 to about 2.2.
- the method can include polymerization of a methyl methacrylate monomer around a 25 mL round bottom flask to form an inner radius of the optic 22 with an inner diameter of approximately 3.8 cm.
- the outer diameter of the optic 22 can be shaped, for example, by an aluminum mold. However, other fabrication methods would be known and the size could be varied according to a particular need.
- the monomer for constructing the optic 22 can be purified to eliminate contaminants.
- the methyl methacrylate monomer can be washed with a solution of sodium hydroxide, rinsed with deionized water, and dried with anhydrous magnesium sulfate. Polymerization can be initiated by benzoyl peroxide and heating the solution to 90° C. The resultant viscous solution is then poured into a mold, such as the one described previously, and then cured in an oven at 35° C. for one week.
- the optic 22 could also be produced with a high quality injection molding of PMMA rather than polymerization.
- the ELIXIR LED 10 of FIG. 9 is generally shown to include an air gap 62 , it would be understood that the air gap 52 can be partially, or completely, replaced with a glass or polymer having an refractive index less than or equal to n 2 .
- the NIMLGCC can be used with visible diode-pumped solid-state lasers 84 as illustrated in FIG. 7 .
- Conventional diode-pumped solid-state lasers 64 include a light source 66 comprising a power source 68 providing energy to a diode pump 70 , such as AlGaAs laser diode.
- Photons emitted from the diode pomp 70 are directed into a laser cavity 74 by a fiber 72 .
- the photons entering the laser cavity 74 are directed to a population inversion crystal 76 , such as a YAG:Nd, which when excited by the photons will emit a light at a first wavelength (at 1064 nm).
- Light of this first wavelength can then reflect between input and output mirrors 75 , 80 and yield a coherent emission, characteristic of the solid-state loser 64 .
- a portion of the first wavelength will impact a doubling crystal 82 , such as a potassium titanium oxide phosphate (KTP) crystal, which doubles the frequency of the light (conversion of the first wavelength to a second wavelength equal to 532 nm).
- KTP potassium titanium oxide phosphate
- the YAG:Nd population inversion crystal 76 and KTP doubling crystal 82 are a highly expensive component of the conventional pumped solid-state laser 64 .
- the NIMLGCC as explained above, can provide an economical and energetically efficient alternative to the conventional pumped solid-state laser 64 .
- the YAG:Nd population inversion crystal 76 and NTP doubling crystal 82 are replaced by an NIMLGCC crystal 86 in the pumped solid-state laser 84 according to the present invention.
- the NIMLGCC crystal 86 can be constructed in a manner as described above and is generally molded and polished to a typical optics standard.
- a first wavelength such as from a 405 nm emitting Indium Gallium Nitride (InGaN) diode 88 of the light source 67 , reflects between the input and output mirrors 78 , 80 as a coherent emission within laser cavity 75 . At least a portion of this first wavelength can be absorbed by the NIMLGCC crystal 86 and a second wavelength is emitted. This second wavelength will traverse the output mirror 80 and will be emitted as the laser output.
- InGaN Indium Gallium Nitride
- the NIMLGCC can be used as a luminescence collector 90 for energy conversion, as shown in FIG. 8 .
- the NIMLGCC is molded into a sheet acting as a light tube 92 .
- the phosphor emissions 94 will be contained as total internal reflections 96 , which are directed toward first and second ends 98 , 100 of the light tube 92 .
- Total internal reflection 96 is accomplished by the selection of an NIMLGCC material for the light tube 92 in accordance with Snell's law and as described previously.
- the NIMLGCC material should be selected so as to maximize the total internal reflections 96 from the phosphor emissions 94 while minimizing transmitted light 102 .
- a light source 104 emits a first wavelength incident 106 to the light tube 92 .
- the first wavelength is absorbed by an inorganic crystalline 42 within the NIMLGCC light tube 92 and reemitted at a second wavelength.
- This second wavelength is transmitted through the light tube 92 by total internal reflection 96 to the first or second ends 98 , 100 of the light tube 92 .
- the reflected light 108 impacts a photovoltaic cell 110 .
- the photovoltaic cell 110 collects a substantial portion of the reflected light 108 and converts the reflected light 108 into another energy, such as electrical current.
- the light tube 92 can be constructed with a small edge profile, which enables the use of a relatively small photovoltaic cell 110 .
- the first and second ends 98 , 100 of the light tube 92 are approximately similar in size to the surface area of the photovoltaic cell 110 . This allows for increased likelihood that the reflected light 108 will impact the photovoltaic cell 110 .
- Suitable materials for the photovoltaic cell are known, but can generally include Si, Ge, GaAs, AlAs, InAs, AlP, InP, GaP, ZnSe, or CdSe, or combinations thereof.
- the efficiency of the ELIXIR LED 10 according to the present invention is demonstrated with a computer simulation of a ray tracing diagram, shown in FIG. 9 .
- the ELIXIR LED 10 is constructed as described above with a phosphor radius, r, and equal to 1.9 cm.
- the ray tracing diagram illustrates the various paths the phosphor-emitting photons can take in exiting the ELIXIR LED 10 .
- Ray 1 exits the ELIXIR LED 10 without encountering any reflections and comprises approximately 35% of the phosphor-emissions.
- Ray 2 (representing approximately 35% of the phosphor-emission) demonstrates one particular benefit of the ELIXIR LED 10 .
- Ray 2 is emitted in a direction toward the planar reflector 16 , where substantial emissions loss occurs in a conventional pcLED package design.
- the phosphor emission is reflected at the phosphor-air interface 112 .
- Ray 2 can then exit the ELIXIR LED 10 and may avoid the planar reflector 16 entirely.
- Ray 3 comprising approximately 17% of the phosphor-emission, heads directly to the reflector 16 before exiting the ELIXIR LED 10 and never encounters the phosphor-air interface 112 .
- Ray 4 is transmitted across the phosphor-air interface 112 but avoids the LED source 12 and recrosses the phosphor-air interface 112 before exiting the ELIXIR LED 10 .
- the transmissions represented by Ray 4 account for approximately 13% of the total phosphor emissions.
- Ray 5 is transmitted across the phosphor-air interface 112 and enters the LED source 12 where the highest losses would occur within conventional LED package designs.
- Ray 5 comprises less than 0.1% of the total phosphor-emission.
Abstract
A light emitting device includes a light emitting diode (LED); a transparent optic having a refractive index noptic; and a phosphor layer spaced apart from the LED and positioned between the LED and the transparent optic. The phosphor layer has an effective refractive index nphosphor, where a gap between the LED and the phosphor layer has a refractive index ngap that is less than nphosphor. The transparent optic has an inner convex surface in contact with the phosphor layer. The inner convex surface has an inner radius of curvature r; and an outer convex surface facing away from the phosphor layer and being a surface through which the light emitting device emits light into a medium adjacent the outer convex surface. The medium has a refractive index nmedium. The outer convex surface has an outer radius of curvature R, such that r/R is equal to nmedium/noptic.
Description
- This application is a continuation application of U.S. patent application Ser. No. 14/792,501, filed Jul. 6, 2015, which is a continuation application of U.S. patent application Ser. No. 14/444,829, filed Jul. 28, 2014, which is a continuation of U.S. patent application Ser. No. 13/794,060, filed Mar. 11, 2013, which is a continuation application of U.S. patent application Ser. No. 12/669,579, filed Jun. 28, 2010, which is a 371 of International Application PCT/US2008/070621, filed Jul. 21, 2008, which in turn, is a non-provisional application of U.S. Provisional Application No. 60/961,185, filed Jul. 19, 2007, the disclosures of which are incorporated herein by reference.
- The present invention relates generally to the field of solid-state lighting and more specifically to high efficiency phosphor-converted LEDs.
- Solid-state lighting (SSL) is a type of lighting that does not use an electrical filament or a gas in the production of light. A primary advantage of SSL over conventional lighting technologies is the potential energy savings as a result of its higher luminous efficiencies over conventional lighting devices. For example, SSL is capable of 50% efficiency with 200 lumen per watt (lm/W) efficacy (compared to 15 lm/W for incandescents and 60-90 lm/W for fluorescents) and up to 100 khr lifetimes. This is approximately 100 times the lifetime of conventional incandescent bulbs and 10 times the lifetime of fluorescents. The Department of Energy (DOE) has set a goal of 50% electrical-to-optical system efficiency with a spectrum accurately reproducing the solar spectrum by 2020. The Optoelectronic Industry Development Association (OIDA) aims for 200-hm/W luminous efficiency with a color rendering index greater than 80.
- Each of these conventional methods and devices has deficiencies. Color mixing is hindered by the absence of an efficient LED material in the 500 nm to 580 nm (green to-yellow) range. Wavelength conversion suffers from phosphor conversion loss and package designs that do not extract phosphor-converted light efficiently.
- SSL devices primarily include light emitting diodes (LEDs), which include a small chip semiconductor, i.e. the LED source, mounted in a reflector cup on a lead frame. The LED source generates photons of light at a first wavelength when energized. The reflector cup reflects photons out of the LED. An optic, generally a silicone or epoxy encapsulation, aids in light extraction from the LED source and protects the LED components.
- High efficiency generation of white light with LEDs has conventionally been according to one of three methods: 1) color mixing; 2) wavelength conversion; or 3) a combination of
methods method 2 are generally referred to as phosphor-converted LEDs (pcLEDs). - Conventional pcLEDs have generally two structural arrangements. First, the phosphor can encompass the LED source of the LED. The phosphor is typically a YAG:Ce crystalline powder in direct contact with the blue wavelength emitting LED source. Both are positioned upon a heat sink base and surrounded by an optic. The other arrangement is a scattered photon extraction (SPE) pcLED, which positions a planar phosphor-layer at a distance away from the LED source. Herein, the YAG:Ce phosphor, in powder form, creates a diffuse, semitransparent layer upon an acrylic optic with a planar surface.
- When the phosphor is in direct contact with the LED source, the phosphor suffers from optical losses by reflection of phosphor-emission back into the LED source rather than through the optic and out of the LED. This can account for up to 60% of the total phosphor emission. The SPE pcLED suffers from scattering of the phosphor emissions. Scattering is the result of substantial differences in the indices of refraction of the phosphor powder and the material that encapsulates the phosphor (air, silicon, PMMA, or glass). The index of refraction, n, is a measure of the relative speed of light in a medium as compared to in a vacuum (where n.sub.vac=1). When light passes from one medium to another medium with a substantially different index of refraction, the speed and direction of the light changes and is known as refraction. Refraction can lead to a randomization, or scattering, of the directionality of the light. Scattering then reduces efficiency by increasing the path length (a) inside the phosphor layer by trapping of the emissions by total internal reflection and (b) inside the device package because of random directionality of the phosphor emission, both of which can lead to reabsorption and optical loss.
- These phosphor-related deficiencies are then compounded by secondary losses encountered by other package design deficiencies, such as imperfections of the reflector cup within the LED. While the reflector cup is intended to direct the phosphor-emission out of the LED, internal reflections and path randomization can trap a portion of the phosphor-emission, such as between the reflector cup and the phosphor, and decrease LED efficiency by approximately 30%.
- Thus, to reach the efficiency goals set forth by the DOE, the problems associated with package design must be eliminated by designing a high efficiency LED that resolves the issues identified above.
- According to the embodiments of the present invention, a light emitting composite material is described. The light emitting composite material includes a glassy material and a plurality of phosphor particles suspended within the glassy material, wherein the refractive index of the plurality of phosphor particles is approximately equal to the refractive index of the glassy material.
- The plurality of phosphor particles can be composed of an inorganic crystalline material selected from the group consisting of YxGdyAlvGawO12O:M3+, wherein x+y=3 and v+w=5; SrGaS4:M2+; SrS:M2+; X2Si5N8:M2+; and XSi2O2N2:M2+, wherein X is selected from the group consisting of He, Mg, Ca, Sr, and Ba and wherein M is selected from a group consisting of Ce, Eu, Mn, Nd, Pr, Sm, Gd, Tb, Dy, Ho, Br, Tm, Yb, Lu, Sc, Ti, V, Cr, Pe, Co, Ni, Cu, Zn, Ir, and Pt.
- The glassy material can be an optical glass comprising an amount from 5% to about 35% of SiO2; an amount from about 55% to about 88% of PbO; optionally an amount less than 10% B2O3; optionally a combined amount less than 8% of Na2O and K2O; and optionally a combined amount less than about 15% total of TiO2, ZrO2, La2O3, ZnO, and BaO.
- In other light emitting composites, the glassy material can be an optical glass comprising an amount from about 21% to about 30% of TIO2; an amount from about 30% to about 50% of BaO, NaO, BeO, CaO, SrO, CdO, Ga2O3, In2O3, or Y2O3; an amount from about 18% to about 24% of Al2O3; and an amount from about 1% to about 10% of SiO2, B2O3, PbO, GeO2, SnO2, ZrO2, HfO2, or ThO2.
- In another aspect of the present invention, the light emitting composites of the present invention can be used within a phosphor-containing light emitting device (pcLED). The pcLED can be constructed as an Enhanced Light Extraction by Internal Reflection (ELIXIR) LED device.
- In yet another aspect of the present invention, the light emitting composite can be used with a solid-state laser.
- In yet another aspect of the present invention, the light emitting composite can be used as a luminescence collector.
-
FIG. 1 is a diagrammatic cross-sectional view of the ELIXIR LED device according an embodiment of the present invention. -
FIG. 2 is a sample spectrum demonstrating the LED source emission band, the phosphor absorption band, and the phosphor emission band. -
FIG. 3 is a diagrammatic cross-sectional view of the ELIXIR LED device according to another embodiment of the present invention. -
FIG. 4 is an enlarged diagrammatic cross-sectional view of a nearly-indexed matched luminescent glass crystal composite. -
FIG. 5A is a diagrammatic cross-sectional view of the total internal reflections within a conventional pcLED device. -
FIG. 5B is a diagrammatic cross-sectional view that illustrates the relation between the relative radii of first and second materials, which leads to total internal reflection. -
FIG. 6 is a diagrammatic view of a conventional pumped solid-state laser device. -
FIG. 7 is a diagrammatic view of a pumped solid-state laser device according to an embodiment of the present invention. -
FIG. 8 is a diagrammatic view of a luminescence collector according to an embodiment of the present invention. -
FIG. 9 is a diagrammatic cross-sectional view of the result of a ray trace diagram for the ELIXIR LED device according to one embodiment of the present invention. - Efficiency of a fully wavelength converted pcLED can be expressed as
-
ηpcL=ηLED·ηs·ηq·ηp Equation 1 - where ηpcL is the total pcLED efficiency and is dependent upon the efficiency of the particular LED source, ηLED; the Stokes conversion efficiency, ηs is, which is the quantum ratio of the average emission wavelengths of the LED and the phosphor; the phosphor quantum efficiency, ηq, which indicates the efficiency of the quantum conversion of light from a first wavelength to a second wavelength inside the phosphor; and the package efficiency, ηp, which is the efficiency of light extraction of LED- and phosphor-emitted photons from the LED device package. The product of ηq·ηp is the conversion efficiency (CE) for an LED device. The embodiments of the present invention optimize CE.
- Package efficiency, ηp, of the present invention is improved over conventional LED devices by first separating an
LED source 12 from first and second non-planar layers, wherein the second layer is composed of aphosphor 14, which will nearly eliminate the reflection of phosphor- and LED-emissions back into theLED source 12. Secondly, aplanar reflector 16 is used to reduce the number of mirror reflections over the conventional LED. The result is an Enhanced Light eXtraction by Internal Reflection (ELIXIR)LED device 10, shown inFIG. 1 . - The ELIXIR LED 10 more specifically includes the first non-planar layer, i.e. a
glass cover 18, surrounding and making immediate contact with the second non-planar layer, i.e. aphosphor 14, and aLED source 12 upon aheat sink base 20. Thephosphor 14 and theLED source 12 are separated by a radius sufficient to substantially reduce the likelihood of phosphor-emissions reentering theLED source 12. This distance, r, is dependent upon a specified fraction of reentry, P, and is given by: -
r≦√[A/(4·π·P)]Equation 2 - Herein, A is the size of the
LED source 12, i.e. the surface area of the LED chip. The high package efficiency is maintained as long as the proportions of theELIXIR LED 10, namely the rphosphor/roptic ratio, are preserved, as described below in connection withFIG. 5B . TheELIXIR LED 10 size is ultimately limited by the size of theLED source 12. The distance to thephosphor 14 from theLED source 12 must be sufficiently long so that only a small fraction of converted light re-enters theLED source 12, where high losses occur. For example, a typical power LED chip has an area of ˜1 mm2. If we specify that less than 1% of phosphor light emitted from any point on thephosphor 14 may reenter theLED source 12, aminimum LED source 12 tophosphor 14 separation of approximately √1 mm2/(4π(0.01)), or ˜2.8 mm is obtained. Theminimum ELIXIR LED 10 diameter would be four times this value, ˜1.1 cm, which is approaching the size of the transparent lens encapsulation and smaller than the heat sink diameter on a typical power LED. - The
LED source 12 can include any conventional resonance cavity LED or laser diode source generally emitting a light having a first wavelength ranging between about 350 nm to about 500 nm. This can include, but should not be limited to, a blue power LED with a peak wavelength of 455 nm with a 1000 mA DC drive capability. - The
glass cover 18 can be any material suitable for the lens construction and for protection of thephosphor 14 andLED source 12, such as polymethyl methacrylate (PMMA) silicones, and glasses. In an alternative embodiment described herein, theglass cover 18 and thephosphor 14 may be made integral. - The
phosphor 14 is applied to theglass cover 18 as a layer of inorganic phosphor crystalline powder. Thephosphor 14 can be applied as a layer, for example, of about 100 μm in thickness, to an inner surface of theglass cover 18 from a solution of acetone or other solvent. Thephosphor 14 should be selected such that the phosphor absorption band substantially overlaps with the LED-emission band, as shown inFIG. 2 . This ensures efficient transfer from the first wavelength, the LED-emission, to the second wavelength, the phosphor-emission. Thus, a suitable phosphor for use with the blue power LED source can be Johnson Polymer Joncryl 587 modified styrene acrylic with 0.2% BASF Lumogen F Yellow 083 fluorescent dye. - Though not specifically shown, the
glass cover 18 can be eliminated and thephosphor 14 is applied as a layer upon the inside radius of ahemispherical optic 22. - While the
phosphor 14,glass cover 18, and optic 22 are generally illustrated and explained with a hemispherical shape, the shape should not be considered so limited. That is, the shape can include hemispheres (seeFIG. 1 ), ellipsoids, spheres 24 (seeFIG. 3 ), or other similar shapes as is desired or necessary. In this way, thephosphor 26,glass cover 28, and optic 30 will include anopening 34 forelectrical connections 36 and support 38 to theLED source 32. While not necessary, theopening 34 should be small in construction to further minimize emission losses. - In optimizing TN of
Equation 1 and theELIXIR LED 10 ofFIG. 1 , thephosphor 14 andglass cover 18 are replaced with a light emittingcomposite material 40 ofFIG. 4 . The light emittingcomposite material 40 integrates the first and second non-planar layers as aninorganic crystalline 42 suspended in aglassy material 44 matrix as illustrated inFIG. 4 . Theinorganic crystalline 42 andglassy material 44 are selected such that, nc, the index of refraction of theinorganic crystalline 42 is approximately equal, ng, to the index of refraction of theglassy material 44. The result is a nearly index-matched luminescent glass-crystal composite (NIMLGCC) 40 that maximizes the quantum efficiency of the phosphor by reducing, or eliminating, optical scattering. - Because of their large surface-to-volume ratio, nanoparticles have low quantum efficiencies. Thus, the
inorganic crystalline 42 should be aparticle 46 that is larger than about 10 nm, i.e. not a nanoparticle. However, because the light-emittingcomposite material 40 has a finite thickness, theinorganic crystalline 42 should be smaller than the thickness of the light-emittingcomposite material 40. Suitable inorganic crystalline 42 can include YxGdyAlvGawO12:M3+, wherein x+y=3 and v+w=5; SrGa2S4:M2+; SrS:M+; X2Si5N8:M2+; and XSi2O2N:M2+, wherein X is selected from a group consisting of Be, Mg, Ca, Sr, and Ba and wherein M is selected from a group consisting of Ce, Eu, Mn, Nd, Pr, Sm, Gd, Ib, Dy, Ho, Er, Tm, Yb, Lu, Sc, Ti, V, Cr, Fe, Co, Ni, Cu, Zn, Ir, and Pt. - It would be permissible for the light-emitting
composite material 40 to comprise a combination of differentinorganic crystallines 42 to obtain a color mixing result of broadband white light emission. For example, two or more UV- or violet-short wavelength inorganiccrystalline materials 42 in the 350 nm to 430 nm range will absorb the first wavelength from theLED source 12 and reemit a combination of red, green, and blue light to achieve a broadband white. The broadband white resulting from a color-mixing light-emittingcomposite 40 is more highly uniform as compared to conventional phosphor color mixing because the emissions of red, green, and blue originate from the same location. In another example, where blue or blue-green shortwavelength LED sources 12 are used (430 nm to 500 nm), these inorganiccrystalline materials 42 will reemit the first wavelength in combination with red and green light to achieve a broadband white. - The
glassy material 44 in which the inorganic crystalline material is suspended can include an optical glass or other glass material, such as those manufactured by Schott North America (Elmsford, N.Y.) including SF-57, SF-67, LASF-9. LASRP47, SK-57. PK-51, PK-53, FK-51A, and FK-5. Other optical glasses can include those according to the teachings of U.S. Appl. No. 2005/0075234 or U.S. Pat. No. 3,960,579, which are hereby incorporated by reference, in their entirety. - The
glassy material 44 can comprise about 10% to about 99.9% of the light emittingcomposite material 40 by weight. - As indicated above, the selection of an
inorganic crystalline 42 andglassy material 44 should be according to index-matching. That is, the index of refraction, nc, of theinorganic crystalline 42 should be approximately equal to the index of refraction, ng, of the glassy material to provide an index of refraction, nz, for the light-emittingcomposite material 40. - By nearly index-matching the inorganic crystalline 42 to the
glassy material 44, scattering induced loss is nearly eliminated. That is, by establishing no ng that is approximately equal to nc, the phosphor-emission will travel at a speed within the inorganic crystalline 42 that is approximately equal to the travel speed within theglassy material 44 and thus reduce refraction, or a change in the direction of the emission. As a result scattering is reduced and ηp increased. - Total internal reflections occur when the interface between first and
second material conventional LED device 50 inFIG. 5A . This condition at the interface occurs when the refractive index of the first material 52 (here the phosphor) is greater than the refractive index of thesecond material 54. According to Snell's Law, the light cannot traverse the interface, but will either refract along the interface or undergo total internal reflection. Total internal reflection of the emission 58 continues until all of the energy in the emission is reabsorbed 60 by the phosphor. -
FIG. 5B shows ahemispherical optic 22 having an internal radius, r, and an outer radius, R. Here, phosphor 14 (which includes, e.g. the light-emitting composite material 40) is located at the internal radius r of the optic 22. Ideally, the optic 22 is constructed from the same transparent material as a host material of the phosphor 14 (e.g. thehost material 44 of the light-emittingcomposite material 40.) In this manner, a refractive index n2 of the optic 22 is equal to or larger than the refractive index of thephosphor 14. A refractive index of the medium that surrounds the optic 22 is n1. Snell's Law can be used to calculate a configuration of the optic 22 for which total internal reflections are eliminated inside the optic 22. This configuration is determinable by establishing a ratio of a radius to the phosphor 14 (which includes, e.g. the light-emitting composite material 40), r, to a radius to the outer diameter of the optic 22, R. This ratio of radii must be less than or equal to the ratio of the index of refraction for material external to the optic 22 (and, hence, external to the ELIXIR LED device 10), n1, and n2: -
r/R≦n 1 /n 2 Equation 3 - Often, this material external to the
ELIXIR LED 10 will be air, or vacuum, having n1=1. Thus, total internal reflection inside the optic 22 will be avoided when r/R is less than the inverse of n2. - The ELIXIR LED 10 of
FIG. 9 includes aplanar reflector 16, anLED source 12 protruding through theplanar reflector 16, aphosphor 14—in this case including the light-emittingcomposite material 40—and an optic 22. Thephosphor 14 is spaced apart from theLED source 12, such that an enclosure formed by thephosphor 14 and theplanar reflector 16 encloses theLED source 12. In this case, a medium inside the enclosure is air, with refractive index n=1. Thephosphor 14 and the optic 22 are coupled together and positioned upon theplanar reflector 16 as provided byEquation 3. Materials for theplanar reflector 16 can include aluminized Mylar attached to an acrylic sheet or a 3M Vikuiti enhanced specular reflector film. By eliminating the reflector cup of conventional, LED package design, phosphor-emission can leave theELIXIR LED 10 without being trapped between theplanar reflector 16 and thephosphor 14. - Finally, the optic 22 positioned externally to the light-emitting
composite material 40 can be constructed of a glass material similar to theglassy material 44 of the light-emittingcomposite material 40. Other materials can also be used so long as refractive index of the optic 22 is greater than or equal to n2. Suitable materials for the optic 22 construction can be polymethyl methacrylate (PMMA), silicones, and glasses having refractive indices of about 1.3 to about 2.2. - When PMMA is used in constructing the optic 22, the method can include polymerization of a methyl methacrylate monomer around a 25 mL round bottom flask to form an inner radius of the optic 22 with an inner diameter of approximately 3.8 cm. The outer diameter of the optic 22 can be shaped, for example, by an aluminum mold. However, other fabrication methods would be known and the size could be varied according to a particular need.
- The monomer for constructing the optic 22 can be purified to eliminate contaminants. For PMMA, the methyl methacrylate monomer can be washed with a solution of sodium hydroxide, rinsed with deionized water, and dried with anhydrous magnesium sulfate. Polymerization can be initiated by benzoyl peroxide and heating the solution to 90° C. The resultant viscous solution is then poured into a mold, such as the one described previously, and then cured in an oven at 35° C. for one week.
- The optic 22 could also be produced with a high quality injection molding of PMMA rather than polymerization.
- While the
ELIXIR LED 10 ofFIG. 9 is generally shown to include anair gap 62, it would be understood that theair gap 52 can be partially, or completely, replaced with a glass or polymer having an refractive index less than or equal to n2. - In other embodiments, the NIMLGCC can be used with visible diode-pumped solid-
state lasers 84 as illustrated inFIG. 7 . Conventional diode-pumped solid-state lasers 64 (seeFIG. 6 ) include alight source 66 comprising apower source 68 providing energy to adiode pump 70, such as AlGaAs laser diode. Photons emitted from thediode pomp 70 are directed into alaser cavity 74 by afiber 72. The photons entering thelaser cavity 74 are directed to apopulation inversion crystal 76, such as a YAG:Nd, which when excited by the photons will emit a light at a first wavelength (at 1064 nm). Light of this first wavelength can then reflect between input and output mirrors 75, 80 and yield a coherent emission, characteristic of the solid-state loser 64. A portion of the first wavelength will impact a doublingcrystal 82, such as a potassium titanium oxide phosphate (KTP) crystal, which doubles the frequency of the light (conversion of the first wavelength to a second wavelength equal to 532 nm). Light of the second wavelength is not reflected by theoutput mirror 80, but rather passes through theoutput mirror 80 as the laser output. - However, the YAG:Nd
population inversion crystal 76 andKTP doubling crystal 82 are a highly expensive component of the conventional pumped solid-state laser 64. The NIMLGCC, as explained above, can provide an economical and energetically efficient alternative to the conventional pumped solid-state laser 64. - For example, as in
FIG. 7 , the YAG:Ndpopulation inversion crystal 76 andNTP doubling crystal 82 are replaced by anNIMLGCC crystal 86 in the pumped solid-state laser 84 according to the present invention. TheNIMLGCC crystal 86 can be constructed in a manner as described above and is generally molded and polished to a typical optics standard. In this way, a first wavelength, such as from a 405 nm emitting Indium Gallium Nitride (InGaN)diode 88 of thelight source 67, reflects between the input and output mirrors 78, 80 as a coherent emission withinlaser cavity 75. At least a portion of this first wavelength can be absorbed by theNIMLGCC crystal 86 and a second wavelength is emitted. This second wavelength will traverse theoutput mirror 80 and will be emitted as the laser output. - In yet another embodiment, the NIMLGCC can be used as a
luminescence collector 90 for energy conversion, as shown inFIG. 8 . Therein, the NIMLGCC is molded into a sheet acting as a light tube 92. As a light tube 92, thephosphor emissions 94 will be contained as totalinternal reflections 96, which are directed toward first and second ends 98, 100 of the light tube 92. Totalinternal reflection 96 is accomplished by the selection of an NIMLGCC material for the light tube 92 in accordance with Snell's law and as described previously. Thus, the NIMLGCC material should be selected so as to maximize the totalinternal reflections 96 from thephosphor emissions 94 while minimizing transmittedlight 102. - In operation of the light tube 92, a
light source 104 emits afirst wavelength incident 106 to the light tube 92. The first wavelength is absorbed by aninorganic crystalline 42 within the NIMLGCC light tube 92 and reemitted at a second wavelength. This second wavelength is transmitted through the light tube 92 by totalinternal reflection 96 to the first or second ends 98, 100 of the light tube 92. As the second wavelength leaves the light tube 92 at the first or second ends 98, 100 as reflected light 108, the reflected light 108 impacts aphotovoltaic cell 110. Thephotovoltaic cell 110 collects a substantial portion of the reflectedlight 108 and converts the reflected light 108 into another energy, such as electrical current. - The light tube 92 can be constructed with a small edge profile, which enables the use of a relatively small
photovoltaic cell 110. Thus, the first and second ends 98, 100 of the light tube 92 are approximately similar in size to the surface area of thephotovoltaic cell 110. This allows for increased likelihood that the reflected light 108 will impact thephotovoltaic cell 110. - Suitable materials for the photovoltaic cell are known, but can generally include Si, Ge, GaAs, AlAs, InAs, AlP, InP, GaP, ZnSe, or CdSe, or combinations thereof.
- The efficiency of the
ELIXIR LED 10 according to the present invention is demonstrated with a computer simulation of a ray tracing diagram, shown inFIG. 9 . Herein, theELIXIR LED 10 is constructed as described above with a phosphor radius, r, and equal to 1.9 cm. - The ray tracing diagram illustrates the various paths the phosphor-emitting photons can take in exiting the
ELIXIR LED 10.Ray 1 exits theELIXIR LED 10 without encountering any reflections and comprises approximately 35% of the phosphor-emissions. Ray 2 (representing approximately 35% of the phosphor-emission) demonstrates one particular benefit of theELIXIR LED 10.Ray 2 is emitted in a direction toward theplanar reflector 16, where substantial emissions loss occurs in a conventional pcLED package design. However, in theELIXIR LED 10, the phosphor emission is reflected at the phosphor-air interface 112.Ray 2 can then exit theELIXIR LED 10 and may avoid theplanar reflector 16 entirely.Ray 3, comprising approximately 17% of the phosphor-emission, heads directly to thereflector 16 before exiting theELIXIR LED 10 and never encounters the phosphor-air interface 112.Ray 4 is transmitted across the phosphor-air interface 112 but avoids theLED source 12 and recrosses the phosphor-air interface 112 before exiting theELIXIR LED 10. The transmissions represented byRay 4 account for approximately 13% of the total phosphor emissions. Finally,Ray 5 is transmitted across the phosphor-air interface 112 and enters theLED source 12 where the highest losses would occur within conventional LED package designs. In theELIXIR LED 10 constructed with a radius of thephosphor 14,Ray 5 comprises less than 0.1% of the total phosphor-emission. - While the invention has been illustrated by a description of various embodiments and while these embodiments have been described in considerable detail, it is not the intention of the applicants to restrict or in any way limit the scope of the appended claims to such detail. Additional advantages and modifications will readily appear to those skilled in the art. Thus, the invention in its broader aspects is therefore not limited to the specific details, representative apparatus and method, and illustrative example shown and described. Accordingly, departures may be made from such details without departing from the spirit or scope of applicants' general inventive concept.
Claims (17)
1-22. (canceled)
23. A light emitting device comprising:
a light source configured to emit light comprising a first wavelength;
a light emitting composite material separated from the light source by an air gap and comprising:
a transparent material; and
a plurality of phosphor particles suspended within the transparent material, wherein a refractive index of the phosphor particles is approximately equal to a refractive index of the transparent material and the phosphor particles are configured to absorb the light comprising the first wavelength and emit light comprising a second wavelength; and
an optic in contact with the light emitting composite material and having a refractive index greater than 90% of an effective refractive index of the light emitting composite material, the optic having a non-planar surface facing away from the light emitting composite material and being a surface through which the light emitting device outputs, during operation, the light comprising the second wavelength into a medium adjacent the non-planar surface.
24. The light emitting device of claim 23 , wherein the plurality of phosphor particles are composed of an inorganic crystalline material selected from the group consisting of:
YxGdyAlvGawO12:M3+, wherein x+y=3 and v+w=5;
SrGa2S4:M2+;
SrS:M2+;
X2Si5N8M2+; and
XSi2O2N2:M2+, wherein X is selected from the group consisting of Be, Mg, Ca, Sr, and Ba and wherein M is selected from a group consisting of Ce, Eu, Mn, Nd, Pr, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Ti, V, Cr, Fe, Co, Ni, Cu, Zn, Ir, and Pt.
25. The light emitting device of claim 23 , wherein the transparent material is an optical glass comprising:
an amount from about 5% to about 35% of SiO2;
an amount from about 55% to about 88% of PbO;
optionally an amount less than about 10% of B2O3;
optionally a combined amount less than about 8% of Na2O and K2O; and
optionally a combined amount less than about 15% total of TiO2, ZrO2, La2O3, ZnO, and BaO.
26. The light emitting device of claim 23 , wherein the transparent material is an optical glass comprising:
an amount from about 21% to about 30% of TiO2;
an amount from about 30% to about 50% of BaO, NaO, BeO, CaO, SrO, CdO, Ga2O3, In2O3, or Y2O3;
an amount from about 18% to about 24% of Al2O3; and
an amount from about 1% to about 10% of SiO2, B2O3, PbO, GeO2, SnO2, ZrO2, HfO2, or ThO2.
27. The light emitting device of claim 23 , wherein the transparent material is a Schott glass.
28. The light emitting device of claim 23 , wherein the refractive index of the plurality of phosphor particles is within five percent of the refractive index of the transparent material.
29. The light emitting device of claim 23 , wherein the plurality of phosphor particles are composed of Y3Al5O12:Ce3+ and the transparent material is a Schott glass.
30. The light emitting device of claim 23 , wherein the plurality of phosphor particles have a size ranging from about 100 nm to about 1 μm.
31. The light emitting device of claim 23 , wherein the plurality of phosphor particles are composed of an inorganic crystalline material having a refractive index of about 1.5 to about 2.8 and the transparent material has a refractive index of about 1.5 to about 2.8.
32. The light emitting device of claim 23 , wherein the first wavelength ranges from about 350 nm to about 500 nm.
33. The light emitting device of claim 23 , wherein the light source is selected from the group consisting of a laser, and a diode.
34. The light emitting device of claim 23 , wherein the light source, the light emitting composite material and the optic are positioned on a planar reflector.
35. The light emitting device of claim 23 , wherein the light emitting composite material and the optic are integral.
36. The light emitting device of claim 23 , wherein the light emitting composite material and the optic are hemispherical.
37. The light emitting device of claim 23 , wherein the light emitting composite material and the optic are spherical.
38. The light emitting device of claim 23 , wherein the second wavelength ranges from about 500 nm to about 700 nm.
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US15/965,793 US10746374B2 (en) | 2007-07-19 | 2018-04-27 | Nearly index-matched luminescent glass-phosphor composites for photonic applications |
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US20140333198A1 (en) | 2014-11-13 |
US8791631B2 (en) | 2014-07-29 |
US20190101261A1 (en) | 2019-04-04 |
US10746374B2 (en) | 2020-08-18 |
US9420664B2 (en) | 2016-08-16 |
US20130214677A1 (en) | 2013-08-22 |
US8598778B2 (en) | 2013-12-03 |
US20160066389A1 (en) | 2016-03-03 |
US9078332B2 (en) | 2015-07-07 |
US20130293099A1 (en) | 2013-11-07 |
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