Light emitting diode and flip-chip light emitting diode package

• US 8,829,549 B2
• Filed: 11/28/2012
• Issued: 09/09/2014
• Est. Priority Date: 12/13/2011
• Status: Active Grant

• Current Assignee: Genesis Photonics Inc., Lite-On Technology Corporation
• Original Assignee: Genesis Photonics Inc.
• Inventors: Huang, Yi-Ru, Wu, Chih-Ling, Lo, Yu-Yun, Su, Po-Jen
• Primary Examiner(s): DANG, PHUC T
• Application Number:
  US13/687,120
• Publication Number:
  US 20130146915A1
• Time in Patent Office: 650 Days
• Field of Search: 257/98, 257/99
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/16 of an individual bump connector
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/382 the electrode extending partially in or entirely through 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 33/405 Reflective materials
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/60 Reflective elements
• 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
• CPC Class Codes: H01L 33/641 characterized by the materials

Abstract

A light emitting diode including a first doped layer, a light emitting layer, a second doped layer and a substrate is provided. A plurality of first grooves penetrate through the second doped layer and the light emitting layer. Thus, a partial surface of the first doped layer is exposed. At least one of the plurality of first grooves extends to edges of the second dope layer and the light emitting layer. An insulating layer is disposed over a part of second doped layer and extends to sidewalls of the first grooves. A first contact is set in the first grooves and electrically connected to the first doped layer. A second contact is set on the second doped layer and electrically connected to the second doped layer. By the first grooves, the first contact can be electrically connected to the first doped layer for improving current spreading.

Claims

1. A light emitting diode, comprising:

a substrate;

a first doped layer, disposed on the substrate;

a light emitting layer, disposed on the first doped layer;

a second doped layer, disposed on the light emitting layer;

a plurality of first grooves, penetrating through the second doped layer and the light emitting layer, and thus a partial surface of the first doped layer is exposed;

an insulating layer, disposed over a part of the second doped layer and extending to the sidewalls of the plurality of first grooves;

a first contact, set in the plurality of first grooves and electrically connected to the first doped layer; and

a second contact, set on the second doped layer and electrically connected to the second doped layer;

wherein from a top view of the light emitting diode, one end of at least one of the plurality of first grooves extends to the edge of the first doped layer.

2. The light emitting diode as claimed in claim 1, wherein the light emitting diode further includes a reflection layer disposed on the second doped layer.

3. The light emitting diode as claimed in claim 2, wherein the area of the reflection layer is at least half of the area of the second doped layer.

4. The light emitting diode as claimed in claim 1, wherein the total area of the plurality of first grooves ranges from 5% to 15% of the area of the first doped layer.

5. The light emitting diode as claimed in claim 1, wherein the plurality of first grooves are linear grooves.

6. The light emitting diode as claimed in claim 1, wherein the plurality of first grooves are curved grooves.

7. The light emitting diode as claimed in claim 1, wherein at least two of the plurality of first grooves are arranged parallel to each other.

8. The light emitting diode as claimed in claim 1, wherein the shortest distance between two ends of each first groove ranges from 0.5 L_L to L_L, where L_L is the length of the longer side of the substrate.

9. The light emitting diode as claimed in claim 1, wherein the width of each first groove ranges from 10 micrometers to 100 micrometers.

10. The light emitting diode as claimed in claim 1, wherein the light emitting diode further includes a plurality of second grooves connected to the plurality of first grooves, respectively, and the extended direction of the plurality of second grooves is different from that of the plurality of first grooves.

11. The light emitting diode as claimed in claim 10, wherein the length of each second groove ranges from L_L/5n to L_L/n, where L_L is the length of the longer side of the substrate and n is the number of the plurality of first grooves.

12. The light emitting diode as claimed in claim 10, wherein the number of the plurality of second grooves is xn, where x is a positive integer and n is the number of the plurality of first grooves.

13. The light emitting diode as claimed in claim 10, wherein the number of the plurality of first grooves is equal to the number of the plurality of second grooves.

14. The light emitting diode as claimed in claim 10, wherein the other end of each first groove extends to the center of the light emitting diode and is connected to each second groove.

15. The light emitting diode as claimed in claim 10, wherein the center of the plurality of second grooves is connected to the plurality of first grooves, respectively.

16. The light emitting diode as claimed in claim 10, wherein the plurality of first grooves and the plurality of second grooves are all linear grooves.

17. The light emitting diode as claimed in claim 16, wherein the plurality of first grooves and the plurality of second grooves are connected perpendicularly to each other.

18. A flip-chip light emitting diode package, comprising:

a package substrate;

a light emitting diode, flipped on and electrically connected to the package substrate;

the light emitting diode comprising;

a substrate;

a first doped layer, disposed on the substrate;

a light emitting layer, disposed on the first doped layer;

a second doped layer, disposed on the light emitting layer;

a plurality of first grooves, penetrating through the second doped layer and the light emitting layer, and thus a partial surface of the first doped layer is exposed;

an insulating layer, disposed over a part of the second doped layer and extending to the sidewalls of the plurality of first grooves;

a first contact, set in the plurality of first grooves and electrically connected to the first doped layer;

a second contact, set on the second doped layer and electrically connected to the second doped layer;

wherein from a top view of the light emitting diode, one end of at least one of the plurality of first grooves extends to the edge of the first doped layer.

19. The flip-chip light emitting diode package as claimed in claim 18, wherein the light emitting diode is electrically connected to the package substrate by bumps.

20. The flip-chip light emitting diode package as claimed in claim 18, wherein the light emitting diode is electrically connected to the package substrate by eutectic structures.