White-light emitting device and the use thereof

• US 7,361,937 B2
• Filed: 06/16/2005
• Issued: 04/22/2008
• Est. Priority Date: 01/06/2005
• Status: Expired due to Fees

• Current Assignee: Genesis Photonics Inc.
• Original Assignee: Genesis Photonics Inc.
• Inventors: Chen, Cheng-Chuan
• Primary Examiner(s): SEFER, AHMED N
• Application Number:
  US11/153,414
• Publication Number:
  US 20060146563A1
• Time in Patent Office: 1,041 Days
• Field of Search: 257/88, 257/90, 257/18, 257/22, 257 14- 15, 257/103, 257/190
• US Class Current: 257/88
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: H01L 2224/48091 Arched
• 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
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence

Abstract

A white-light emitting device includes a first die and a second die. The first die has a first semiconductor light-emitting layer emitting a first primary color light. The second die has a second semiconductor light-emitting layer emitting a second primary color light, and a third semiconductor light-emitting layer mounted proximate to the second semiconductor light-emitting layer and emitting a third primary color light. The first primary color light is combined with the second and third primary color lights so as to produce white light.

Claims

1. A white-light emitting device, comprising:

a first die including a first semiconductor light-emitting layer emitting a first primary color light; and

a second die including a second semiconductor light-emitting layer emitting a second primary color light, and a third semiconductor light-emitting layer mounted proximate to said second semiconductor light-emitting layer and emitting a third primary color light;

said first primary color light being combined with said second and third primary color lights so as to produce white light,

wherein said second die further includes a p-type cladding layer and an n-type cladding layer, said second and third semiconductor light-emitting layers being disposed between said p-type and n-type cladding layers, and

wherein said second semiconductor light-emitting layer includes a first barrier film proximate to said p-type cladding layer, a second barrier film proximate to said third semiconductor light-emitting layer, and a carrier confining film between said first and second barrier films and having a plurality of alternating peaks and valleys, said carrier confining film having an energy gap smaller than those of said first and second barrier films.

2. The device as claimed in claim 1, wherein said first primary color light is red light having a wavelength ranging from 575 nm to 700 nm, said second primary color light being blue light having a wavelength ranging from 430 nm to 485 nm, said third primary color light being green light having a wavelength ranging from 510 nm to 560 nm.

3. The device as claimed in claim 1, wherein said carrier confining film is made of a material having formula Al_(1-x-y)In_yGa_xN, wherein 0≦

x<

1, 0<

y≦

1, and 0≦

1−

x−

y<

1.

4. The device as claimed in claim 1, wherein second semiconductor light-emitting layer has a valley density ranging from 5% to 75%, said valley density being defined by a ratio of a summation of the widths of said valleys to a total length of said second semiconductor light-emitting layer along a direction that said widths are measured.

5. The device as claimed in claim 1, further comprising a carrying pad carrying said first and second dies thereon, a first lead frame electrically connected to said first and second dies, and a second lead frame electrically connected to said first and second dies.

6. The device as claimed in claim 5, wherein said carrying pad includes a receiving recess for receiving said first and second dies, and a light-transmissive encapsulating material filled in said receiving recess to encapsulate said first and second dies.