Light-emitting device

Patent metadata

Field	Value
Publication number	US-11145789-B2
Application number	US-201916673008-A
Country	US
Kind code	B2
Filing date	Nov 4, 2019
Priority date	Nov 4, 2019
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A light-emitting device includes a substrate including a top surface; a semiconductor stack including a first semiconductor layer, an active layer and a second semiconductor layer formed on the substrate, wherein a portion of the top surface is exposed; a distributed Bragg reflector (DBR) formed on the semiconductor stack and contacting the portion of the top surface of the substrate; a metal layer formed on the distributed Bragg reflector (DBR), contacting the portion of the top surface of the substrate and being insulated with the semiconductor stack; and an insulation layer formed on the metal layer and contacting the portion of the top surface of the substrate.

First claim

What is claimed is:

1. A light-emitting device, comprising:
a substrate comprising a top surface;
a plurality of light-emitting elements formed on the substrate, wherein the plurality of light-emitting elements comprises a first plurality of light-emitting elements arranged on a first column, a second plurality of light-emitting elements arranged on a second column, and the first column and the second column are separated by a trench, wherein each of the plurality of light-emitting elements comprises a first semiconductor layer, a second semiconductor layer, and an active layer formed between the first semiconductor layer and the second semiconductor layer, and wherein the first plurality of light-emitting elements comprises a first light-emitting element, and the second plurality of light-emitting elements comprises a second light-emitting element;
a first lower electrode formed on the first semiconductor layer of the first light-emitting element;
a first upper electrode formed on the second semiconductor layer of the first light-emitting element;
a first bottom electrode portion contacting the first lower electrode;
a first top electrode portion contacting the first upper electrode, wherein the first bottom electrode portion covers the first light-emitting element and the second light-emitting element or the first top electrode portion covers the first light-emitting element and the second light-emitting element;
a second lower electrode formed on the first semiconductor layer of the second light-emitting element;
a second upper electrode formed on the second semiconductor layer of the second light-emitting element;
a second bottom electrode portion contacting the second lower electrode; and
a second top electrode portion contacting the second upper electrode.

2. The light-emitting device according to claim 1 , wherein the first bottom electrode portion covers the first light-emitting element and the second light-emitting element, and the first top electrode portion covers the first light-emitting element and the second light-emitting element.

3. The light-emitting device according to claim 1 , further comprising a connecting electrode portion formed on the trench to electrically connect the first light-emitting element and the second light-emitting element,
wherein the trench is covered by the first bottom electrode portion.

4. The light-emitting device according to claim 1 , further comprising a connecting electrode portion formed on the trench to electrically connect the first light-emitting element and the second light-emitting element,
wherein the trench is covered by the first top electrode portion.

5. The light-emitting device according to claim 2 , further comprising a connecting electrode portion formed on the trench to electrically connect the first light-emitting element and the second light-emitting element,
wherein the trench is covered by the first bottom electrode portion and the first top electrode portion.

6. The light-emitting device according to claim 1 , wherein a first ratio of a first surface area of the first top electrode portion on the first light-emitting element to that of the first bottom electrode portion on the first light-emitting element is between 1.1˜1.6.

7. The light-emitting device according to claim 1 , wherein the first bottom electrode portion is separated from the first top electrode portion by a shortest distance smaller than 100 μm and larger than 10 μm.

8. The light-emitting device according to claim 1 , wherein a second ratio of a second surface area of the second top electrode portion on the second light-emitting element to that of the second bottom electrode portion on the second light-emitting element is between 1.1˜1.6.

9. The light-emitting device according to claim 1 , wherein the first bottom electrode portion is separated from the second top electrode portion by a shortest distance smaller than 50 μm and larger than 10 μm.

10. The light-emitting device according to claim 1 , wherein the first plurality of light-emitting elements comprises different amount from that of the second plurality of light-emitting elements.

11. The light-emitting device according to claim 1 , wherein the first plurality of light-emitting elements comprises same amount as that of the second plurality of light-emitting elements.

12. The light-emitting device according to claim 10 , further comprising
a first electrode pad; and
a second electrode pad formed on the first plurality of light-emitting elements,
wherein the first plurality of light-emitting elements is covered by the second electrode pad and the second plurality of light-emitting elements is covered by the first electrode pad.

13. The light-emitting device according to claim 11 , further comprising:
a first electrode pad; and
a second electrode pad,
wherein the first plurality of light-emitting elements is covered by the second electrode pad and the second plurality of light-emitting elements is covered by the first electrode pad.

14. The light-emitting device according to claim 1 , further comprising a first current blocking layer formed under the first upper electrode, and a second current blocking layer formed under the second upper electrode.

15. The light-emitting device according to claim 14 , further comprising a first conductive layer formed between the first current blocking layer and the first upper electrode, and a second conductive layer formed between the second current blocking layer and the second upper electrode.

16. The light-emitting device according to claim 1 , further comprising an insulating layer cover the plurality of light-emitting elements, wherein the insulating layer comprises a first lower opening exposing the first lower electrode, a first upper opening exposing the first upper electrode.

17. The light-emitting device according to claim 16 , wherein the first bottom electrode portion contacts the first lower electrode through the first lower opening, and the first top electrode portion contacts the first upper electrode through the first upper opening.

18. The light-emitting device according to claim 1 , further comprising a street surrounding the light-emitting device, wherein the street exposes a portion of the top surface of the substrate.

19. The light-emitting device according to claim 1 , further comprising:
an insulating layer covering sidewalls of the plurality of light-emitting elements;
a metal layer formed on the insulating layer; and
a passivation layer formed on the metal layer,
wherein the metal layer is formed between the insulating layer and the passivation layer to be insulated from the plurality of light-emitting elements.

Assignees

• Epistar Corp

Inventors

• Lin Che-Hung
• Liao Chien-Chih
• HSU Chi-Shiang
• Kuo De-Shan
• Chen Chao-Hsing

Classifications

• H10H20/8314

  extending at least partially onto an outer side surface of the bodies · CPC title

• H10H20/814

  having reflecting means, e.g. semiconductor Bragg reflectors · CPC title

• H10H20/8162

  Current-blocking structures · CPC title

• H10H20/813 Primary

  having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies · CPC title

• H01L33/385

  Electricity · mapped topic