Light emitting element

• US 10,276,751 B2
• Filed: 12/07/2017
• Issued: 04/30/2019
• Est. Priority Date: 12/09/2013
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Sato, Kosuke, Emura, Keiji
• Primary Examiner(s): Tran, Tan N
• Application Number:
  US15/835,175
• Publication Number:
  US 20180097149A1
• Time in Patent Office: 509 Days
• Field of Search: 257 98, 257 99, 257100
• CPC Class Codes: H01L 33/06 within the light emitting region, e.g. quantum confinement structure or tunnel barrier
• CPC Class Codes: H01L 33/38 with a particular shape
• 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

Abstract

A light emitting element has semiconductor layers and first and second electrodes disposed. In plan view, the first electrode has a first connecting portion, a first extending portion, and two second extending portions, and the second electrode has a second connecting portion and two third extending portions. The first extending portion of the first electrode extends linearly from the first connecting portion toward the second connecting portion, and the two second extending portions extend parallel to the first extending portion on two sides of the first extending portion. The second extending portions each has two bent portions. The third extending portions extend parallel to the first extending portion between the first extending portion and the second extending portion. With respect to an extending direction of the first extending portion, each of the second extending portions extends beyond a position of the second connecting portion.

Claims

1. A light emitting element comprising:

a semiconductor stack including a first conductivity type semiconductor layer and a second conductivity type semiconductor layer;

a first electrode formed on the first conductivity type semiconductor layer; and

a second electrode formed on the second conductivity type semiconductor layer,

the first electrode and the second electrode being disposed on the same face side of the first conductivity type semiconductor layer and the second conductivity type semiconductor layer,

in plan view,

the first electrode having a first connecting portion, a first extending portion, and two second extending portions, the first connecting portion being configured to be bonded with a conductive wire,

the second electrode having a second connecting portion and two third extending portions, the second connecting portion being configured to be bonded with a conductive wire,

the first extending portion extending linearly from the first connecting portion toward the second connecting portion, and the two second extending portions arranged on two sides of the first extending portion, with each of the second extending portions having two bent portions and a linear portion extending parallel to the first extending portion and disposed between the two bent portions,

the two third extending portions extending parallel to the first extending portion between the first extending portion and the two second extending portions,

with respect to an extending direction of the first extending portion, each of the second extending portions extends beyond a position of the second connecting portion,

a maximum length of the first connecting portion is larger than a maximum width of each of the first extending portion, the second extending portions and the third extending portions, and

a maximum length of the second connecting portion is larger than the maximum width of each of the first extending portion, the second extending portions and the third extending portions.

2. The light emitting element according to claim 1, wherein

distances between the first extending portion and the respective second extending portions are the same, and

the distances between the first extending portion and the respective third extending portions are the same.

3. The light emitting element according to claim 2, wherein

the two third extending portions extend to form a U shape.

4. The light emitting element according to claim 2, wherein

each of distal ends of the second extending portions including a portion parallel to a first portion of a corresponding one of the third extending portions on the outside of the corresponding one of the third extending portions, and extending closer to the second connecting portion than an imaginary line that extends along a second portion of the corresponding one of the third extending portions, with the second portion extending parallel to the first extending portion.

5. The light emitting element according to claim 1, wherein

the two third extending portions extend to form a U shape.

6. The light emitting element according to claim 5, wherein

the first conductivity type semiconductor layer is disposed over the second conductivity type semiconductor layer, the first conductivity type semiconductor layer is a p-type semiconductor layer, and

the first electrode and the second electrode are entirely surrounded by the p-type semiconductor layer of the semiconductor stack.

7. The light emitting element according to claim 5, wherein

each of distal ends of the second extending portions including a portion parallel to a first portion of a corresponding one of the third extending portions on the outside of the corresponding one of the third extending portions, and extending closer to the second connecting portion than an imaginary line that extends along a second portion of the corresponding one of the third extending portions, with the second portion extending parallel to the first extending portion.

8. The light emitting element according to claim 5, wherein

each of the third extending portions includes a portion parallel to the first extending portion disposed between the first extending portion and a corresponding one of the second extending portions, and a distal end that is bent toward the first connecting portion from the portion parallel to the first extending portion.

9. The light emitting element according to claim 1, wherein

in plan view,

the semiconductor stack is rectangular, and

the first extending portion is parallel to one side of the semiconductor stack.

10. The light emitting element according to claim 1, wherein

the second extending portions extend from the first connecting portion, and the third extending portions extend from the second connecting portion.

11. The light emitting element according to claim 1, wherein

the first conductivity type semiconductor layer is disposed over the second conductivity type semiconductor layer, the first conductivity type semiconductor layer is a p-type semiconductor layer,

the first electrode and the second electrode are entirely surrounded by the p-type semiconductor layer of the semiconductor stack.

12. The light emitting element according to claim 11, wherein

each of the third extending portions includes a portion parallel to the first extending portion disposed between the first extending portion and a corresponding one of the second extending portions, and a distal end that is bent toward the first connecting portion from the portion parallel to the first extending portion.

13. The light emitting element according to claim 1, wherein

the distal end of each of the second extending portions including a portion parallel to a first portion of a corresponding one of the third extending portions on the outside of the corresponding one of the third extending portions, and extending closer to the second connecting portion than an imaginary line that extends along a second portion of the corresponding one of the third extending portions, with the second portion extending parallel to the first extending portion.

14. The light emitting element according to claim 13, wherein

each of the third extending portions includes a portion parallel to the first extending portion disposed between the first extending portion and a corresponding one of the second extending portions, and a distal end that is bent toward the first connecting portion from the portion parallel to the first extending portion.

15. The light emitting element according to claim 1, wherein

each of the third extending portions includes a portion parallel to the first extending portion disposed between the first extending portion and a corresponding one of the second extending portions, and a distal end that is bent toward the first connecting portion from the portion parallel to the first extending portion.

16. The light emitting element according to claim 1, wherein

with respect to an extending direction of the first extending portion, at least a portion of one of the bent portions of each of the second extending portions extends beyond the second connecting portion.

17. The light emitting element according to claim 1, wherein

the first extending portion only includes a linear piece in plan view.

18. The light emitting element according to claim 1, wherein

the first extending portion does not split into separate pieces in plan view.

19. The light emitting element according to claim 1, wherein

the first connecting portion and the second connecting portion are pad electrodes.