WO2004068600A1 - Phosphor based light sources having a non-planar long pass reflector and method of making - Google Patents

Phosphor based light sources having a non-planar long pass reflector and method of making Download PDF

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Publication number
WO2004068600A1
WO2004068600A1 PCT/US2004/002169 US2004002169W WO2004068600A1 WO 2004068600 A1 WO2004068600 A1 WO 2004068600A1 US 2004002169 W US2004002169 W US 2004002169W WO 2004068600 A1 WO2004068600 A1 WO 2004068600A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
multilayer reflector
phosphor
light source
source according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2004/002169
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English (en)
French (fr)
Inventor
Andrew J. Ouderkirk
Michael F. Weber
John A. Wheatley
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.)
3M Innovative Properties Co
Original Assignee
3M Innovative Properties Co
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 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Priority to EP04705625A priority Critical patent/EP1588431A1/en
Priority to JP2006503048A priority patent/JP2006517345A/ja
Publication of WO2004068600A1 publication Critical patent/WO2004068600A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8514—Wavelength conversion means characterised by their shape, e.g. plate or foil
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/84—Coatings, e.g. passivation layers or antireflective coatings
    • H10H20/841—Reflective coatings, e.g. dielectric Bragg reflectors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/84—Coatings, e.g. passivation layers or antireflective coatings

Definitions

  • White light sources that utilize LEDs in their construction can have two basic configurations.
  • white light is generated by direct emission of different colored LEDs. Examples include a combination of a red LED, a green LED, and a blue LED, and a combination of a blue LED and a yellow LED.
  • LED-excited phosphor-based light sources PLEDs
  • a single LED generates a beam in a narrow range of wavelengths, which beam impinges upon and excites a phosphor material to produce visible light.
  • long pass reflective filters are placed opposite the phosphor layer from the LED in order to recycle the LED excitation light back to the phosphor in order to improve system efficiency.
  • a long pass filter may be omitted if the LED emissions are in the visible spectrum and large amounts are needed to balance the phosphor color output.
  • a long pass filter that partially transmits the shortwave light such as e.g. blue light, can be used to optimize the angular performance of a blue-LED/yellow-phosphor system via the spectral angle shift that would pass more blue light at higher angles than at normal incidence.
  • the system of LED, phosphor, and multilayer optical film can be designed with light flux and temperature control taken into consideration.
  • a reflective polarizer can be disposed adjacent the multilayer reflector and/or adjacent the phosphor material. The reflective polarizer allows light of a prefened polarization to be emitted, while reflecting the other polarization.
  • the non-planar multilayer reflector 224 can be positioned to receive light from an LED 212, as discussed herein.
  • the non-planar multilayer reflector 224 can be any useable thickness.
  • the non-planar polymeric multilayer reflector 224 can be 5 to 200 micrometers thick or 10 to 100 micrometers thick.
  • the non-planar multilayer reflector 224 can optionally be substantially free of inorganic materials.
  • the non-planar multilayer reflector can be positioned in any usable configuration with the LED, as described herein.
  • the non-planar multilayer reflector is positioned between the layer of phosphor and the LED (see e.g., FIGs. 15-17).
  • the layer of phosphor is positioned between the non-planar multilayer reflector and the LED (see e.g., FIGs. 13, 14, 16-21).
  • Example 7 The total luminous flux emitted into the integrating sphere was calculated to be 0.095 lumens. This represents an increase in luminous intensity when compared to Example 6 of about 44%.
  • a sheet of MOF-PVC described in Example 11 was placed on a clean flat surface with the MOF side facing up.
  • the top surface of the MOF-PVC was wiped with a lint free cotton cloth dampened with methanol.
  • About 3 grams of the ZnS phosphor paste described in Example 9 was placed onto the MOF-PVC.
  • the phosphor paste was hand- drawn into a coating using the 2 mil gap of a square multiple clearance applicator (designated PAR-5353 by BYK-Gardner USA of Columbia, Maryland, USA).
  • the wet film was cured at a temperature of about 130 °C for 30 minutes in a gravity convection oven (designated Model 1350G by VWR International, Inc., of West Chester,

Landscapes

  • Led Device Packages (AREA)
  • Luminescent Compositions (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Filters (AREA)
PCT/US2004/002169 2003-01-27 2004-01-27 Phosphor based light sources having a non-planar long pass reflector and method of making Ceased WO2004068600A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04705625A EP1588431A1 (en) 2003-01-27 2004-01-27 Phosphor based light sources having a non-planar long pass reflector and method of making
JP2006503048A JP2006517345A (ja) 2003-01-27 2004-01-27 非平面ロングパスリフレクターを備えた蛍燐光体系光源および作製方法

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US44327403P 2003-01-27 2003-01-27
US44323503P 2003-01-27 2003-01-27
US44323203P 2003-01-27 2003-01-27
US60/443,235 2003-01-27
US60/443,274 2003-01-27
US60/443,232 2003-01-27
US10/727,026 2003-12-02
US10/727,026 US7312560B2 (en) 2003-01-27 2003-12-02 Phosphor based light sources having a non-planar long pass reflector and method of making

Publications (1)

Publication Number Publication Date
WO2004068600A1 true WO2004068600A1 (en) 2004-08-12

Family

ID=32738904

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/002169 Ceased WO2004068600A1 (en) 2003-01-27 2004-01-27 Phosphor based light sources having a non-planar long pass reflector and method of making

Country Status (6)

Country Link
US (1) US7312560B2 (https=)
EP (1) EP1588431A1 (https=)
JP (1) JP2006517345A (https=)
KR (1) KR20050103206A (https=)
TW (1) TW200503292A (https=)
WO (1) WO2004068600A1 (https=)

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