LIGHT EMITTING DEVICE

• US 20160351769A1
• Filed: 08/09/2016
• Published: 12/01/2016
• Est. Priority Date: 10/29/2014
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: JUNG, Se Yeon, LEE, Yong Gyeong
• Granted Patent: US 9,806,233 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 33/06 within the light emitting region, e.g. quantum confinement structure or tunnel barrier
• 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 33/382 the electrode extending partially in or entirely through the semiconductor body
• CPC Class Codes: H01L 33/42 Transparent materials
• 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

Disclosed is a light emitting device which includes a light emitting structure including a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer, a first current blocking layer, a second current blocking layer arranged on the light emitting structure to be separated from each other, a light-transmitting conductive layer arranged on the first current blocking layer, the second current blocking layer and the light emitting structure, first electrode and second electrode electrically coupled to the first conductive semiconductor layer and the second conductive semiconductor layer, respectively, a through hole formed through the light-transmitting conductive layer, the second conductive semiconductor layer and the active layer to a portion of the first conductive semiconductor layer, and a through electrode arranged inside the through hole. Here, the through electrode does not overlap the first current blocking layer in a vertical direction.

Claims

1. A light emitting device comprising:

a light emitting structure comprising a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer;

a first current blocking layer disposed on the light emitting structure;

a second current blocking layer disposed on the light emitting structure and electrically separated from the first current blocking layer;

a light-transmitting conductive layer disposed on the first current blocking layer, the second current blocking layer and the light emitting structure;

a first electrode electrically connected to the first conductive semiconductor layer and overlapped with the first current blocking layer in the vertical direction;

a second electrode electrically connected to the second conductive semiconductor layer and overlapped with the second current blocking layer in the vertical direction;

a through electrode disposed through the light-transmitting conductive layer, the second conductive semiconductor layer and the active layer to a portion of the first conductive semiconductor layer; and

an insulation layer disposed between the first electrode and the first current blocking layer and between the second electrode and the second current blocking layer,

wherein the through electrode is electrically connected to the first electrode and electrically separated from the light-transmitting conductive layer, the second conductive semiconductor layer and the active layer by the insulation layer.

2. The light emitting device of claim 1, wherein the through electrode non-overlaps the first current blocking layer in the vertical direction.

3. The light emitting device of claim 1, wherein the through electrode and the first current blocking layer are linearly arranged in a horizontal direction.

4. The light emitting device of claim 1, wherein the first electrode comprises a first bonding pad and a first branched-finger electrode.

5. The light emitting device of claim 4, wherein the first bonding pad is arranged at a first edge region of the light emitting device.

6. The light emitting device of claim 4, wherein at least a portion of the first branched-finger electrode overlaps the through electrode and the first current blocking layer in the vertical direction.

7. The light emitting device of claim 1, wherein the through electrode has a length smaller than a distance between neighboring through electrodes.

8. The light emitting device of claim 1, wherein the second electrode comprises a second bonding pad and a second branched-finger electrode.

9. The light emitting device of claim 8, wherein the second bonding pad is arranged at a second edge region of the light emitting device.

10. The light emitting device of claim 9, wherein a portion of the second branched-finger electrode overlaps the second current blocking layer in the vertical direction.

11. The light emitting device of claim 1, wherein a portion of the insulation layer is opened to form an open region, and the light-transmitting conductive layer is exposed through the open region.

12. The light emitting device of claim 11, wherein the light-transmitting conductive layer directly contacts to the second electrode at the open region.

13. The light emitting device of claim 11, wherein the open region and the through electrode are alternately arranged in a horizontal direction.

14. The light emitting device of claim 1, wherein at least one of the first current blocking layer and the second current blocking layer is a distributed Bragg reflector (DBR) or an omni-directional reflector (ODR).

15. A light emitting device comprising:

a light emitting structure comprising a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer;

a first current blocking layer disposed on the light emitting structure;

a second current blocking layer disposed on the light emitting structure and electrically separated from the first current blocking layer;

a light-transmitting conductive layer disposed on the first current blocking layer, the second current blocking layer and the light emitting structure;

a first electrode electrically connected to the first conductive semiconductor layer and overlapped with the first current blocking layer in the vertical direction;

a second electrode electrically connected to the second conductive semiconductor layer and overlapped with the second current blocking layer in the vertical direction;

a through electrode electrically connected to the first electrode and disposed through the light-transmitting conductive layer, the second conductive semiconductor layer and the active layer to a portion of the first conductive semiconductor layer; and

an insulation layer disposed between the first electrode and the first current blocking layer and between the second electrode and the second current blocking layer,

wherein a portion of the insulation layer is opened to form an open region, and the light-transmitting conductive layer is exposed through the open region, and

wherein the insulation layer has a constant thickness on light-transmitting conductive layer except for at the open region, and a height of the insulation layer is greater at regions corresponding to at least one of the first current blocking layer or the second current blocking layer than the other regions.

16. The light emitting device of claim 15, wherein the through electrode is electrically separated from the light-transmitting conductive layer, the second conductive semiconductor layer and the active layer by the insulation layer.

17. The light emitting device of claim 15, wherein the through electrode non-overlaps the first current blocking layer in the vertical direction.

18. The light emitting device of claim 15, wherein at least one of the first current blocking layer and the second current blocking layer is a distributed Bragg reflector (DBR) or an omni-directional reflector (ODR).

19. A light emitting device comprising:

a light emitting structure comprising a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer;

a first current blocking layer disposed on the light emitting structure;

a second current blocking layer disposed on the light emitting structure and electrically separated from the first current blocking layer;

a light-transmitting conductive layer disposed on the first current blocking layer, the second current blocking layer and the light emitting structure;

a first electrode electrically connected to the first conductive semiconductor layer;

a second electrode electrically connected to the second conductive semiconductor layer;

a through electrode electrically connected to the first electrode and disposed through the light-transmitting conductive layer, the second conductive semiconductor layer and the active layer to a portion of the first conductive semiconductor layer; and

an insulation layer disposed between the first electrode and the first current blocking layer and between the second electrode and the second current blocking layer,

wherein at least one of the first current blocking layer and the second current blocking layer is a distributed Bragg reflector (DBR) or an omni-directional reflector (ODR).

20. The light emitting device of claim 19, wherein the first electrode overlaps the first current blocking layer in the vertical direction, and the second electrode overlaps the second current blocking layer in the vertical direction.