CA2577798A1 - Optical system using led coupled with phosphor-doped reflective materials - Google Patents

Optical system using led coupled with phosphor-doped reflective materials Download PDF

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Publication number
CA2577798A1
CA2577798A1 CA002577798A CA2577798A CA2577798A1 CA 2577798 A1 CA2577798 A1 CA 2577798A1 CA 002577798 A CA002577798 A CA 002577798A CA 2577798 A CA2577798 A CA 2577798A CA 2577798 A1 CA2577798 A1 CA 2577798A1
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CA
Canada
Prior art keywords
light
wavelength
phosphor
lighting system
radiant energy
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.)
Granted
Application number
CA002577798A
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French (fr)
Other versions
CA2577798C (en
Inventor
Jack C. Rains, Jr.
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.)
Advanced Optical Technologies LLC
Original Assignee
Advanced Optical Technologies, Llc
Jack C. Rains, Jr.
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 Advanced Optical Technologies, Llc, Jack C. Rains, Jr. filed Critical Advanced Optical Technologies, Llc
Priority to CA2686613A priority Critical patent/CA2686613A1/en
Publication of CA2577798A1 publication Critical patent/CA2577798A1/en
Application granted granted Critical
Publication of CA2577798C publication Critical patent/CA2577798C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/62—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using mixing chambers, e.g. housings with reflective walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/37—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors characterised by their material, surface treatment or coatings
    • 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
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
    • F21V7/26—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material the material comprising photoluminescent substances
    • 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
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
    • F21V7/30—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings the coatings comprising photoluminescent substances
    • 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
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • 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
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • 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
    • F21V7/0025—Combination of two or more reflectors for a single light source
    • 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]
    • 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
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • 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
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
    • H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/181—Encapsulation

Abstract

A method of producing substantially white light for an application visible by a person, the method comprising: emitting light of a first wavelength into an optical integrating cavity defined by a diffusely reflective surface; impinging at least a portion of the light of the first wavelength on a phosphor bearing material at the diffusely reflective surface; exciting a first phosphor of the phosphor bearing material with a first portion of the light of the first wavelength impinging on the diffusely reflective surface, so that the first phosphor emits visible light of a second wavelength different from the first wavelength; exciting a second phosphor of the phosphor bearing material with light energy, so that the second phosphor emits visible light of a third wavelength different from the first and second wavelengths; diffusely reflecting at least some of the light of at least the second and third wavelengths from the diffusely reflective surface of the optical integrating cavity, so as to combine light of the second and third wavelengths to form the substantially white light; and emitting the substantially white light from the optical integrating cavity toward a region intended to be illuminated for the application visible by the person.

Claims (34)

1. A lighting system, for emitting visible light so as to be humanly perceptible, the lighting system comprising:
an energy source package, for emitting radiant energy of a first wavelength;
a reflector outside the energy source package, having a reflective surface arranged to receive radiant energy from the energy source package;
at least one phosphor doped within the reflector, such that radiant energy of the first wavelength from the energy source package excites the at least one phosphor to emit visible light, comprising visible light energy of at least one second wavelength different from the first wavelength, wherein at least some of visible light emitted by the at least one phosphor is reflected by the reflective surface of the reflector, and the lighting system directs at least the visible light emitted by the at least one phosphor so that it can be perceived by a person.
2. The lighting system of claim 1, wherein the energy source package comprises a semiconductor device for emitting the radiant energy of the first wavelength and an enclosure for the semiconductor device.
3. The lighting system of claim 2, wherein the semiconductor device comprises a light emitting diode for emitting at least some ultraviolet (UV) radiation.
4. The lighting system of claim 2, wherein the semiconductor device comprises at least one light emitting diode for emitting at least some blue light.
5. The lighting system of claim 1, wherein the reflective surface exhibits a diffuse reflectivity.
6. The lighting system of claim 5, wherein the reflective surface forms an optical integrating cavity with an aperture for emission of combined radiant energy.
7. The lighting system of claim 6, further comprising a deflector having an inner reflective surface coupled to the aperture of the optical integrating cavity.
8. The lighting system of claim 5, wherein:
the reflective surface forms a diffusely reflective cavity having an aperture;
and the lighting system further comprises a mask outside the cavity, having a reflective surface facing toward the aperture of the cavity and arranged to occlude a substantial portion of the aperture.
9. The lighting system of claim 1, further comprising a second reflector positioned between the energy source package and a region to be illuminated by the visible light from the system so as to mask view of the energy source package by the person.
10. The lighting system of claim 9, further comprising at least one phosphor doped within the second reflector, such that radiant energy excites the phosphor in the second reflector to emit visible light, comprising visible light energy of a wavelength different from the first wavelength.
11. The lighting system of claim 1, wherein the at least one phosphor doped within the reflector comprises:
a first phosphor of a type which is excited by radiant energy of the first wavelength to emit visible light comprising light energy of the second wavelength; and a second phosphor of a type different from the first type, which is excited to emit visible light comprising light energy of a third wavelength different from the first and second wavelengths.
12. The lighting system of claim 11, wherein the at least one phosphor doped within the reflector further comprises a third phosphor of a type which is excited to emit visible light comprising light energy of a fourth wavelength different from the first, second and third wavelengths.
13. The lighting system of claim 1, wherein:
the energy source package includes a source of blue light; and the system further comprises a source of visible red light and a source of green light arranged to emit at least some visible red light and green light for reflection from the reflective surface of the reflector.
14. The lighting system of claim 1, wherein:
the energy source package includes a source of ultraviolet (UV) radiant energy; and the system further comprises a source of visible red light, a source of green light and a source of blue light arranged to emit at least some visible red, green and blue light for reflection from the reflective surface of the reflector.
15. A lighting system, for emitting visible light, the lighting system comprising:
a structure forming an optical integrating cavity comprising a material forming a diffusely reflective inner surface of the cavity and at least one passage for emission of radiant energy integrated by diffuse reflection within the cavity;
a light emitting semiconductor device, coupled for emission of radiant energy of a first wavelength into the cavity; and at least one phosphor doped into the material forming the diffusely reflective inner surface of the cavity, the at least one phosphor being of a type excited by radiant energy of the first wavelength for emission of visible light of at least one second wavelength different from the first wavelength for reflection and integration within the cavity so as to be included in light emitted through the at least one passage.
16. The lighting system of claim 15, wherein:
the light emitting semiconductor device comprises a light emitting diode (LED) within an enclosure; and the reflective inner surface of the cavity is outside the enclosure of the semiconductor device.
17. The lighting system of claim 16, wherein the LED comprises a white, blue or ultraviolet (UV) LED.
18. The lighting system of claim 15, wherein:
the light emitting semiconductor device comprises a plurality of light emitting diodes (LEDs);
a first one of the LEDs emits radiant energy of a first character; and a second one of the LEDs emits radiant energy of a second character, different from the first character.
19. The lighting system of claim 18, wherein:
the radiant energy from the first LED comprises light of a first color; and the radiant energy from the second LED comprises light of a second color different from the first color.
20. The lighting system of claim 19, wherein a third one of the LEDs emits radiant energy comprising light of a third color different from the first and second colors.
21. The lighting system of claim 20, wherein at least two of the colors of light are visible colors.
22. The lighting system of claim 20, wherein the system forms a fixture for illuminating an area to be inhabited by a person.
23. The lighting system of claim 20, wherein the system forms a fixture for providing luminance to be observed by a person.
24. The lighting system of claim 15, further comprising a substrate for the cavity, wherein the material forming the diffusely reflective inner surface of the cavity comprises a coating formed on the substrate.
25. The lighting system of claim 15, wherein the material forming the diffusely reflective inner surface of the cavity comprises a substantially white plastic.
26. The lighting system of claim 15, wherein the structure forming the optical integrating cavity comprises a base with a diffusely reflective surface and a mask with a reflective surface facing toward the diffusely reflective surface of the base, wherein at least portions of the reflective surfaces of the base and the mask form the reflective inner surface of the optical integrating cavity.
27. The lighting system of claim 26, wherein the reflective surface of the mask is diffusely reflective.
28. The lighting system of claim 15, wherein the at least one phosphor doped into the material forming the diffusely reflective inner surface of the cavity comprises:

a first phosphor of a type which is excited by radiant energy of the first wavelength to emit visible light comprising the second wavelength; and a second phosphor of a type different from the first type, which is excited to emit visible light of a third wavelength different from the first and second wavelengths.
29. The lighting system of claim 28, wherein the at least one phosphor doped into the material forming the diffusely reflective inner surface of the cavity further comprises a third phosphor of a type which is excited to emit visible light of a fourth wavelength different from the first, second and third wavelengths.
30. A method of producing substantially white light for an application visible by a person, the method comprising:
generating light of a first wavelength;
impinging at least a portion of the light of the first wavelength on a diffusely reflective surface of a doped material;
exciting a first phosphor within the doped material with a first portion of the light of the first wavelength impinging on the diffusely reflective surface, so that the first phosphor emits visible light of a second wavelength different from the first wavelength;
exciting a second phosphor within the doped material with radiant energy, so that the second phosphor emits visible light of a third wavelength different from the first and second wavelengths;
diffusely reflecting at least some of the light of the first wavelength from the diffusely reflective surface, so as to combine light of the first wavelength with the light of the and second and third wavelengths to form the substantially white light; and emitting the substantially white light toward a region intended to be illuminated for the application visible by the person.
31. The method of claims 31, wherein the radiant energy exciting the second phosphor comprises a second portion of the light of the first wavelength impinging on the diffusely reflective surface.
32. The method of claim 31, wherein the radiant energy exciting the second phosphor comprises radiant energy of a wavelength different from the first wavelength.
33. A method of producing substantially white light for a humanly perceptible visible lighting application, the method comprising:
emitting radiant energy of a first wavelength into a space defined by a diffusely reflective surface;
impinging at least a portion of the radiant energy of the first wavelength on a phosphor doped material forming the diffusely reflective surface;
exciting a phosphor within the doped material with a portion of the radiant energy of the first wavelength impinging on the diffusely reflective surface, so that the first phosphor emits radiant energy of one or more second wavelengths different from the first wavelength into the space, wherein the radiant energy wavelengths within the space comprise at least two colors of visible light;
diffusely reflecting at least some of the radiant energy wavelengths of the visible light from the diffusely reflective surface, so as to combine the at least two colors of visible light and thereby form the substantially white light; and emitting the substantially white light toward a region intended to be illuminated for the humanly perceptible lighting application.
34. The method of claim 33, wherein the space comprises an optical integrating cavity, such that the step of diffusely reflecting substantially integrates the at least two colors of visible light to obtain the substantially white light.
CA2577798A 2004-09-29 2005-08-26 Optical system using led coupled with phosphor-doped reflective materials Expired - Fee Related CA2577798C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2686613A CA2686613A1 (en) 2004-09-29 2005-08-26 Optical system using led coupled with phosphor-doped reflective materials

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/951,630 US7144131B2 (en) 2004-09-29 2004-09-29 Optical system using LED coupled with phosphor-doped reflective materials
US10/951,630 2004-09-29
PCT/US2005/030399 WO2006039017A2 (en) 2004-09-29 2005-08-26 Optical system using led coupled with phosphor-doped reflective materials

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA2686613A Division CA2686613A1 (en) 2004-09-29 2005-08-26 Optical system using led coupled with phosphor-doped reflective materials

Publications (2)

Publication Number Publication Date
CA2577798A1 true CA2577798A1 (en) 2006-04-13
CA2577798C CA2577798C (en) 2010-11-23

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CA2577798A Expired - Fee Related CA2577798C (en) 2004-09-29 2005-08-26 Optical system using led coupled with phosphor-doped reflective materials
CA2686613A Abandoned CA2686613A1 (en) 2004-09-29 2005-08-26 Optical system using led coupled with phosphor-doped reflective materials

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CA2686613A Abandoned CA2686613A1 (en) 2004-09-29 2005-08-26 Optical system using led coupled with phosphor-doped reflective materials

Country Status (6)

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US (4) US7144131B2 (en)
EP (2) EP2196730B1 (en)
JP (1) JP2008515164A (en)
AT (2) ATE542087T1 (en)
CA (2) CA2577798C (en)
WO (1) WO2006039017A2 (en)

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US20120014089A1 (en) 2012-01-19
US7144131B2 (en) 2006-12-05

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