Device of white light-emitting diode

• US 6,841,804 B1
• Filed: 10/27/2003
• Issued: 01/11/2005
• Est. Priority Date: 10/27/2003
• Status: Active Grant

• Current Assignee: Formosa Epitaxy Incorporated (Epistar Corporation), Lumens Co., Ltd.
• Original Assignee: Formosa Epitaxy Incorporated (Epistar Corporation)
• Inventors: Chien, Feng-Ku, Chien, Fen-Ren, Chen, Lung-Chien, Lan, Wen-How
• Primary Examiner(s): CRANE, SARA W
• Application Number:
  US10/695,506
• Time in Patent Office: 442 Days
• Field of Search: 257/98, 257/89, 257/99, 257/103, 313/503, 313/504
• US Class Current: 257/98
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/26 the material comprising photoluminescent substances
• CPC Class Codes: F21V 7/30 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body

Abstract

A white LED device includes a member, a plurality of LEDs, fixed on the member, the LEDS further comprising blue GaN LEDs, a reflector, in parabolic shape, to encase thed member and the plurality of LEDs, yellow phosphor, coated on the surface of the reflector facing the LEDs, and a supporting component, for connecting the member and the reflector in order to connect the LEDs, the member and the reflector together. The main feature of the present invention includes that the LEDs emit blue light when positively biased. The blue light triggers yellow phosphor to generate a yellow light, and the blue light mixed with the yellow light to become a white light. The white light is reflected by the reflector to project onto target objects.

Claims

1. A white LED device, comprising:

a member,

a plurality of LEDs, fixed on the member, the LEDs further comprising blue GaN LEDs,

a reflector, in parabolic shape, to encase the member and the plurality of LEDs,

yellow phosphor, coated on the surface of the reflector facing the LEDs, and

a supporting component, for connecting the member and the reflector in order to connect the LEDs, the member and the reflector together,

wherein the LEDs emit blue light when positively biased, the blue light stimulating the yellow phosphor to generate yellow light, the blue light mixed with the yellow light to become a white light, the white light reflected by the reflector to project onto target objects.

2. The device as claimed in claim 1, wherein the LEDs further comprises blue GaN LEDs, green GaN LEDs, and red AlGaAs LEDs.

3. The device as claimed in claim 1, wherein the yellow phosphor is coated on a transparent film attached to the reflector.

4. The device as claimed in claim 1, wherein the reflector is coated with the yellow phosphor by spin-coating, sputtering, printing, or other similar methods.