Light-emitting device
View Patent ↗A light-emitting device is provided. The light-emitting device comprises: a light-emitting stack having an active layer; an electrode structure on the light-emitting stack and comprising a first electrode and an extension electrode protruding from the first electrode toward an edge of the light-emitting device in a first extending direction; a transparent insulating layer between the light-emitting stack and the electrode structure, wherein the transparent insulating layer comprises a first part and an extension part protruding from the first part toward the edge of the light-emitting device in a second extending direction; wherein a surface area of a surface of the first electrode distal from the transparent insulating layer is smaller than a surface area of a surface of the transparent insulating layer distal from the light-emitting stack, the first electrode is right above the first part, and a part of the extension electrode is right above the extension part.
1. A light-emitting device, comprising:
a light-emitting stack having an active layer;
an electrode structure on the light-emitting stack and comprising a first electrode and an extension electrode protruding from the first electrode toward an edge of the light-emitting device in a first extending direction;
a transparent insulating layer between the light-emitting stack and the electrode structure, wherein from a top view of the light-emitting device, the transparent insulating layer comprises a first part and an extension part extending from the first part, the first part aligned with and under the first electrode having a first maximum width, the extension part aligned with and under a part of the extension electrode having a second maximum width less than the first maximum width;
wherein the extension part comprises a first edge and the extension electrode comprises a second edge, and a part of the first edge of the extension part protrudes laterally outward from the second edge of the extension electrode.
2. The light-emitting device according to claim 1 , further comprises an electrical contact layer on the light-emitting stack and in contact with the transparent insulating layer.
3. The light-emitting device according to claim 2 , wherein a part of the transparent insulating layer overlays a part of the electrical contact layer.
4. The light-emitting device according to claim 2 , wherein a part of a bottom surface of the transparent insulating layer and a bottom surface of the electrical contact layer are substantially coplanar on the light-emitting stack.
5. The light-emitting device according to claim 2 , wherein the electrode structure overlays and in direct contact with a part of the electrical contact layer, and the transparent insulating layer separates the electrode structure from another part of the electrical contact layer.
6. The light-emitting device according to claim 2 , wherein the electrical contact layer is between the extension electrode and the light-emitting stack.
7. The light-emitting device according to claim 2 , wherein in a cross-sectional view of the light-emitting device, the transparent insulating layer overlays a part of an upper surface of the electrical contact layer, and the electrode structure overlays a part of the surface of the transparent insulating layer distal from the light-emitting stack.
8. The light-emitting device according to claim 1 , further comprising an insulating layer under the light-emitting stack.
9. The light-emitting device according to claim 8 , wherein the insulating layer comprises multiple discrete insulating regions.
10. The light-emitting device according to claim 9 , wherein one of the insulating regions is right under the first part.
11. The light-emitting device according to claim 10 , wherein in a cross-sectional view of the light-emitting device, the insulating region right under the first part has a width less than a maximum width of the transparent insulating layer.
12. The light-emitting device according to claim 1 , wherein the transparent insulating layer comprises oxide material.
13. The light-emitting device according to claim 1 , wherein the refractive index of the transparent insulating layer is between 1 and 3.4 both inclusive, the transmittance of the transparent insulating layer is greater than 80%.
14. The light-emitting device according to claim 1 , wherein an exposed surface of the light-emitting stack is a rough surface.
15. The light-emitting device according to claim 1 , wherein the transparent insulating layer has a thickness not less than 800 angstrom (Å).
16. The light-emitting device according to claim 1 , wherein the extension electrode comprises a first extension and a second extension extending from the first extension, wherein a part of the first extension is right above the extension part of the transparent insulating layer.
17. The light-emitting device according to claim 1 , wherein the extension electrode has a third maximum width substantially perpendicular to the first extending direction, and the first electrode has a fourth maximum width greater than the first maximum width.
18. The light-emitting device according to claim 1 , wherein the second maximum width is substantially perpendicular to the first extending direction.
19. The light-emitting device according to claim 17 , wherein the second maximum width is greater than the third maximum width.
20. The light-emitting device according to claim 1 , wherein a surface area of a surface of the first electrode distal from the transparent insulating layer is smaller than a surface area of a surface of the transparent insulating layer distal from the light-emitting stack.