Light emitting device and manufacture method thereof

• US 20060169994A1
• Filed: 10/12/2005
• Published: 08/03/2006
• Est. Priority Date: 02/03/2005
• Status: Active Grant

• Current Assignee: Biing-Jay Lee, Epistar Corporation, United Epitaxy Company (Epistar Corporation)
• Original Assignee: United Epitaxy Company (Epistar Corporation)
• Inventors: Shieh, Yuh-Ren, Tu, Chuan-Cheng, Wu, Jen-Chau
• Granted Patent: US 7,192,797 B2
• Time in Patent Office: Days
• US Class Current: 257/89
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2933/0016 relating to electrodes
• CPC Class Codes: H01L 33/36 characterised by the electrodes
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/385 the electrode extending at least partially onto a side surface of the semiconductor body
• CPC Class Codes: H01L 33/387 with a plurality of electrode regions in direct contact with the semiconductor body and being electrically interconnected by another electrode layer
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A flip-chip LED including a light emitting structure, a first dielectric layer, a first metal layer, a second metal layer, and a second dielectric layer is provided. The light emitting structure includes a first conductive layer, an active layer, and a second conductive layer. The active layer is disposed on the first conductive layer, and the second conductive layer is disposed on the active layer. The first metal layer is disposed on the light emitting structure and is contact with the first conductive layer, and part of the first metal layer is disposed on the first dielectric layer. The second metal layer is disposed on the light emitting structure and is in contact with the second conductive layer, and part of the second metal layer is disposed on the first dielectric layer. The second dielectric layer is disposed on the first dielectric layer.

Claims

1. A method of forming a light emitting device (LED), comprising:

forming a light emitting structure, said light emitting structure comprising a first conductive layer, an active layer, and a second conductive layer, said active layer being disposed on said first conductive layer and being a light emitting layer, said second conductive layer being disposed on said active layer;

forming a first dielectric layer on said light emitting structure;

forming a second dielectric layer on said first dielectric layer;

forming a first metal layer, said first metal layer being disposed on said light emitting structure and electrically-connected to said first conductive layer, a portion of said first metal layer being disposed on said first dielectric layer; and

forming a second metal layer, said second metal layer being disposed on said light emitting structure and electrically-connected to said second conductive layer, a portion of said second metal layer being disposed on said first dielectric layer;

wherein said first dielectric layer and said second dielectric layer electrically-isolate said first metal layer from said second metal layer;

wherein a portion of said first dielectric layer is a transparent layer, and a surface of said first dielectric layer contacting said first metal layer and/or said second metal layer is provided for reflecting the light emitted from said light emitting structure.

2. The method of claim 1, wherein said first metal layer is a first electrode and said second metal layer is a second electrode;

wherein said first metal layer and/or said second metal layer are thermal conductive paths for said light emitting structure.

3. The method of claim 1, wherein a thickness of said transparent layer, D≦

20 μ

m.

4. The method of claim 1, wherein said first metal layer and/or said second metal layer are formed by using a printing technology.

5. The method of claim 1, wherein said second dielectric layer is formed by using a printing technology.

6. A method of forming a light emitting device array, comprising:

providing a substrate;

forming a plurality of light emitting devices, wherein the steps for forming each light emitting device comprise;

forming a light emitting structure on said substrate, said light emitting structure comprising a first conductive layer, an active layer, and a second conductive layer, said active layer being disposed on said first conductive layer and being a light emitting layer, said second conductive layer being disposed on said active layer;

forming a first dielectric layer on said light emitting structure;

forming a second dielectric layer on said first dielectric layer;

forming a first metal layer, said first metal layer being disposed on said light emitting structure and electrically-connected to said first conductive layer, a portion of said first metal layer being disposed on said first dielectric layer; and

forming a second metal layer, said second metal layer being disposed on said light emitting structure and electrically-connected to said second conductive layer, a portion of said second metal layer being disposed on said first dielectric layer;

wherein, for each light emitting device, said first dielectric layer and said second dielectric layer electrically-isolate said first metal layer from said second metal layer;

wherein, for each light emitting device, a portion of said first dielectric layer is a transparent layer, and a surface of said first dielectric layer contacting said first metal layer and/or said second metal layer is provided for reflecting the light emitted from said light emitting structure.

7. The method of claim 6, wherein, for each light emitting device, said first metal layer is a first electrode and said second metal layer is a second electrode;

wherein said first metal layer and/or said second metal layer are thermal conductive paths for said light emitting structure.

8. The method of claim 6, wherein, for each light emitting device, said first metal layer and/or said second metal layer are formed by using a printing technology.

9. The method of claim 6, wherein, for each light emitting device, said second dielectric layer is formed by using a printing technology.

10. The method of claim 6, further comprising:

forming a third dielectric layer for isolating said plurality of light emitting devices from each other.

11. The method of claim 6, wherein said plurality of light emitting devices comprise at least a red LED, a green LED, and a blue LED.

12. A light emitting device, comprising:

a light emitting structure, said light emitting structure comprising a first conductive layer, an active layer, and a second conductive layer, said active layer being disposed on said first conductive layer and being a light emitting layer, said second conductive layer being disposed on said active layer;

a first dielectric layer on said light emitting structure;

a first metal layer, said first metal layer being disposed on said light emitting structure and electrically-connected to said first conductive layer, a portion of said first metal layer being disposed on said first dielectric layer; and

a second metal layer, said second metal layer being disposed on said light emitting structure and electrically-connected to said second conductive layer, a portion of said second metal layer being disposed on said first dielectric layer;

a second dielectric layer on said first dielectric layer, wherein said first dielectric layer and said second dielectric layer electrically-isolate said first metal layer from said second metal layer;

wherein a portion of said first dielectric layer is a transparent layer, and a surface of said first dielectric layer contacting said first metal layer and/or said second metal layer is provided for reflecting the light emitted from said light emitting structure.

13. The light emitting device of claim 12, wherein said first metal layer is a first electrode and said second metal layer is a second electrode.

14. The light emitting device of claim 13, wherein said first metal layer and/or said second metal layer are thermal conductive paths for said light emitting structure.

15. The light emitting device of claim 12, wherein said first metal layer and/or said second metal layer are thermal conductive paths for said light emitting structure.

16. The light emitting device of claim 12, wherein a thickness of said transparent layer, D≦

20 μ

m.

17. A light emitting device array, comprising:

a substrate;

a plurality of light emitting devices disposed on said substrate, each light emitting device comprising;

a light emitting structure, said light emitting structure comprising a first conductive layer, an active layer, and a second conductive layer, said active layer being disposed on said first conductive layer and being a light emitting layer, said second conductive layer being disposed on said active layer;

a first dielectric layer on said light emitting structure;

a first metal layer, said first metal layer being disposed on said light emitting structure and electrically-connected to said first conductive layer, a portion of said first metal layer being disposed on said first dielectric layer; and

a second metal layer, said second metal layer being disposed on said light emitting structure and electrically-connected to said second conductive layer, a portion of said second metal layer being disposed on said first dielectric layer;

a second dielectric layer on said first dielectric layer, wherein, for each light emitting device, said first dielectric layer and said second dielectric layer electrically-isolate said first metal layer from said second metal layer;

wherein, for each light emitting device, a portion of said first dielectric layer is a transparent layer, and a surface of said first dielectric layer contacting said first metal layer and/or said second metal layer is provided for reflecting the light emitted from said light emitting structure.

18. The light emitting device array of claim 17, wherein, for each light emitting device, said first metal layer is a first electrode and said second metal layer is a second electrode;

wherein said first metal layer and/or said second metal layer are thermal conductive paths for said light emitting structure.

19. The light emitting device array of claim 17, further comprising a third dielectric layer for isolating said plurality of light emitting devices from each other.

20. A light emitting device array of claim 17, wherein said plurality of light emitting devices comprise at least a red LED, a green LED, and a blue LED.