Light emitting diode, method of fabricating the same and LED module having the same

• US 10,573,785 B2
• Filed: 12/11/2017
• Issued: 02/25/2020
• Est. Priority Date: 07/29/2013
• Status: Active Grant

• Current Assignee: Seoul Viosys Co., Ltd. (Seoul Semiconductor Co., Ltd.)
• Original Assignee: Seoul Viosys Co., Ltd. (Seoul Semiconductor Co., Ltd.)
• Inventors: Chae, Jong Hyeon, Lee, Joon Sup, Suh, Daewoong, Roh, Won Young, Kang, Min Woo, Jang, Jong Min, Oh, Se Hee, Kim, Hyun A
• Primary Examiner(s): Maruf, Sheikh
• Application Number:
  US15/838,264
• Publication Number:
  US 20180114879A1
• Time in Patent Office: 806 Days
• Field of Search: 257741, 257773, 257774, 257459, 257211, 438612, 438622, 438396, 438381, 438733
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/40 Materials therefor
• 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

Abstract

A light emitting diode is provided to include a first conductive-type semiconductor layer; a mesa including a second conductive-type semiconductor layer disposed on the first conductive-type semiconductor layer and an active layer interposed between the first and the second conductive-type semiconductor layers; and a first electrode disposed on the mesa, wherein the first conductive-type semiconductor layer includes a first contact region disposed around the mesa along an outer periphery of the first conductive-type semiconductor layer; and a second contact region at least partially surrounded by the mesa, the first electrode is electrically connected to at least a portion of the first contact region and at least a portion of the second contact region, and a linewidth of an adjoining region between the first contact region and the first electrode is greater than the linewidth of an adjoining region between the second contact region and the first electrode.

Claims

1. A light emitting device comprising:

a substrate having a first sidewall, a second sidewall opposite to the first sidewall along a first direction;

a first semiconductor layer formed over the substrate;

an active layer formed over the first semiconductor layer;

a second semiconductor layer formed over the active layer;

a first electrode formed over the first semiconductor layer and having first electrode portions extending from the first sidewall toward the second sidewall; and

a second electrode formed over the second semiconductor layer and having a connecting portion and second electrode portions extending from the connecting portion toward the first sidewall;

wherein one of the first electrode portions and the connecting portion are arranged along the first direction;

a first pad electrically contacting the first semiconductor layer through the exposed portion of the first semiconductor layer; and

a second pad electrically contacting the second semiconductor layer through the exposed portion of the second semiconductor layer.

2. The light emitting device of claim 1, wherein one of the first electrode portions and one of the second electrode portions are alternately arranged along a second direction different from the first direction.

3. The light emitting device of claim 1, wherein each of the first electrode portions has a sidewall not aligned with a sidewall of the first semiconductor layer.

4. The light emitting device of claim 1, wherein the first electrode and the second electrode electrically contact with the first semiconductor layer and the second semiconductor layer, respectively.

5. The light emitting device of claim 1, further comprising an insulation layer formed over the first semiconductor layer and the second semiconductor layer and structured to expose portions of the first semiconductor layer and the second semiconductor layer.

6. The light emitting device of claim 5, wherein the insulation layer includes a distributed Bragg reflector (DBR).

7. The light emitting device of claim 1, wherein the second electrode includes indium tin oxide (ITO) or an oxide material.

8. The light emitting device of claim 1, wherein the active layer and the second semiconductor layer have sidewalls not aligned with sidewalls of the first semiconductor layer.

9. A light emitting device comprising:

a substrate having a first to fourth side surfaces, the first and second side surfaces parallel to each other along a first direction and the third and fourth side surfaces parallel to each other along a second direction different from the first direction;

a first semiconductor layer formed over the substrate and having side surfaces aligned with the first to fourth side surfaces of the substrate;

a mesa formed over the first semiconductor layer and having side surfaces not aligned with the first to fourth side surfaces of the substrate, the mesa including an active layer and a second semiconductor layer and having different widths along the first direction and the second directions;

an insulation layer formed over the mesas and the first semiconductor layer and structured to expose portions of the first semiconductor layer and the second semiconductor layer;

a first pad electrically contacting the first semiconductor layer through the exposed portion of the first semiconductor layer; and

a second pad electrically contacting the second semiconductor layer through the exposed portion of the second semiconductor layer.

10. The light emitting device of claim 9, wherein a portion of the first semiconductor layer is disposed between portions of the mesa.

11. The light emitting device of claim 9, wherein the mesa includes branches having an elongated shape and disposed parallel to one another and a connecting portion connecting the branches.

12. The light emitting device of claim 9, wherein the mesa includes protrusions protruding toward the second side surface.

13. The light emitting device of claim 9, further comprising:

a first electrode electrically coupled to the first semiconductor layer; and

a second electrode electrically coupled to the second semiconductor layer.

14. The light emitting device of claim 13, wherein the first electrode has a width that varies along the first direction.

15. The light emitting device of claim 13, wherein the second electrode includes indium tin oxide (ITO) or an oxide material.

16. The light emitting device of claim 9, wherein the insulation layer includes a distributed Bragg reflector (DBR).

17. The light emitting device of claim 9, wherein the insulation layer includes multiple layers.

18. The light emitting device of claim 9, further comprising a current spreading layer formed on the insulation layer and covering the mesa and the first semiconductor layer, the current spreading layer contacting the first semiconductor layer through the exposed portion of the first semiconductor layer.