LIGHT-EMITTING DEVICE

• US 20160343909A1
• Filed: 08/04/2016
• Published: 11/24/2016
• Est. Priority Date: 02/20/2014
• Status: Active Grant

• Current Assignee: Epistar Corporation
• Original Assignee: Epistar Corporation
• Inventors: HUANG, Yu-Ting, CHUNG, Chien-Kai, CHIU, Po-Shun, WANG, Hsin-Ying, KUO, De-Shan, KO, Tsun-Kai
• Granted Patent: US 9,755,109 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01L 33/145 with a current-blocking structure
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/22 Roughened surfaces, e.g. at the interface between epitaxial layers
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/382 the electrode extending partially in or entirely through the semiconductor body

Abstract

A light-emitting device includes: a light-emitting stack including a first side, a second side opposite to the first side, a third side connecting the first side and the second side, and an upper surface between the first side and the second side; a first electrode pad formed on the upper surface; a second electrode pad formed on the upper surface, wherein the first electrode pad is closer to the first side than the second electrode pad; and a first extension electrode including a first section extended from the first electrode pad in a direction away from the third side, and a second section connecting to the first section and perpendicular to the first side; wherein a distance between the first electrode pad and the third side is smaller than a distance between the second electrode pad and the third side.

Claims

1. A light-emitting device, comprising:

a light-emitting stack comprising a first side, a second side opposite to the first side, a third side connecting the first side and the second side, and an upper surface between the first side and the second side;

a first electrode pad formed on the upper surface;

a second electrode pad formed on the upper surface, wherein the first electrode pad is closer to the first side than the second electrode pad; and

a first extension electrode comprising a first section extended from the first electrode pad in a direction away from the third side, and a second section connecting to the first section and perpendicular to the first side;

wherein a distance between the first electrode pad and the third side is smaller than a distance between the second electrode pad and the third side.

2. The light-emitting device of claim 1, wherein the first section is parallel to the first side.

3. The light-emitting device of claim 1, wherein the first electrode pad is adjacent to the third side between the first side and the second side of the light-emitting stack.

4. The light-emitting device of claim 1, further comprising a second extension electrode comprising a first branch and a second branch respectively extended from the second electrode pad.

5. The light-emitting device of claim 4, wherein the first branch and the second branch are asymmetrical.

6. The light-emitting device of claim 4, wherein the second section comprises an end toward the second side and the end of the second section is between the first branch and the second branch.

7. The light-emitting device of claim 4, wherein the second section comprises two ends toward the first side and the second side, respectively, and the two ends of the second section is between the first branch and the second branch.

8. The light-emitting device of claim 7 wherein the two ends of the second section are aligned to each other in accordance with a line perpendicular to the first side.

9. The light-emitting device of claim 4 wherein the second section comprises a symmetrical shape.

10. The light-emitting device of claim 1, further comprising a branch extended from the second electrode pad and having a pattern surrounding the second section.

11. The light-emitting device of claim 1, further comprising a substrate configured to support the light-emitting stack, wherein the substrate comprises an uneven surface facing the light-emitting stack.

12. The light-emitting device of claim 1, wherein the light-emitting stack comprises a fourth side opposite to the third side, and the first side, the second side, the third side and the fourth side form a rectangle.

13. The light-emitting device of claim 12, further comprising a second extension electrode comprising a first branch and a second branch respectively extended from the second electrode pad, wherein the first branch comprises a third section parallel to the third side and a fourth section connected to the third section and toward the first side.