Light-emitting device

1. A light-emitting device, comprising:

a semiconductor structure comprising a first semiconductor layer, a second semiconductor layer, and an active layer between the first semiconductor layer and the second semiconductor layer;

a surrounding part surrounding the semiconductor structure and exposing a surface of the first semiconductor layer;

a first insulating structure formed on the semiconductor structure, including a plurality of protrusions covering portions of the surface of the first semiconductor layer and a plurality of recesses exposing other portions of the surface of the first semiconductor layer;

a first contact portion formed on the surrounding part and contacting the other portions of the surface of the first semiconductor layer by the plurality of recesses;

a first pad formed on the semiconductor structure; and

a second pad formed on the semiconductor structure.

2. The light-emitting device according to claim 1 , further comprising a second contact portion formed at a geometric center of the semiconductor structure in a top view of the light-emitting device.

3. The light-emitting device according to claim 1 , further comprising a third contact portion formed on the semiconductor structure, wherein the third contact portion is surrounded by the first contact portion.

4. The light-emitting device according to claim 1 , further comprising a second contact portion formed at a geometric center of the semiconductor structure, wherein the second contact portion is connected to the first contact portion, and/or further comprising a third contact portion formed on the semiconductor structure, wherein the third contact portion is surrounded by the first contact portion and connected to the second contact portion.

5. The light-emitting device according to claim 1 , further comprising one or a plurality of vias penetrating the second semiconductor layer and the active layer to expose the first semiconductor layer.

6. The light-emitting device according to claim 1 , wherein the first insulating structure covers corners of the surface of the first semiconductor layer.

7. The light-emitting device according to claim 1 , wherein the plurality of protrusions and the plurality of recesses are alternately arranged.

8. The light-emitting device according to claim 1 , further comprising a second insulating structure formed on the surrounding part and covering the first insulating structure, wherein the second insulating structure comprises a shape corresponding to a shape of the first insulating structure.

9. The light-emitting device according to claim 1 , further comprising a third insulating structure formed on the semiconductor structure, wherein the third insulating structure comprises a first opening and a second opening, and the first pad is formed in the first opening and the second pad is formed in the second opening.

10. The light-emitting device according to claim 1 , wherein the first contact portion comprises a concave-convex top surface disposed along a periphery of the first insulating structure.

11. A light-emitting device, comprising:

a semiconductor structure comprising a first semiconductor layer, a second semiconductor layer, and an active layer between the first semiconductor layer and the second semiconductor layer;

a surrounding part surrounding the semiconductor structure and exposing a surface of the first semiconductor layer;

a first insulating structure formed on the semiconductor structure, covering corners of the surface of the first semiconductor layer and exposing portions at edges of the surface of the first semiconductor layer;

a first contact portion formed on the surrounding part and contacting the portions at edges of the surface of the first semiconductor layer;

a first pad formed on the semiconductor structure; and

a second pad formed on the semiconductor structure.

12. The light-emitting device according to claim 11 , further comprising a second contact portion formed at a geometric center of the semiconductor structure in a top view of the light-emitting device.

13. The light-emitting device according to claim 11 , further comprising a third contact portion formed on the semiconductor structure, wherein the third contact portion is surrounded by the first contact portion.

14. The light-emitting device according to claim 11 , further comprising a second contact portion formed at a geometric center of the semiconductor structure, wherein the second contact portion is connected to the first contact portion.

15. The light-emitting device according to claim 11 , further comprising one or a plurality of vias penetrating the second semiconductor layer and the active layer to expose the first semiconductor layer.

16. The light-emitting device according to claim 11 , wherein the first insulating structure comprises a plurality of protrusions covering the surface of the first semiconductor layer and a plurality of recesses exposing the surface of the first semiconductor layer.

17. The light-emitting device according to claim 16 , wherein the plurality of protrusions and the plurality of recesses are alternately arranged.

18. The light-emitting device according to claim 16 , further comprising a second insulating structure formed on the surrounding part and covering the first insulating structure, wherein the second insulating structure comprises a shape corresponding to a shape of the first insulating structure.

19. The light-emitting device according to claim 11 , further comprising a third insulating structure formed on the semiconductor structure, wherein the third insulating structure comprises a first opening and a second opening, and the first pad is formed in the first opening and the second pad is formed in the second opening.

20. The light-emitting device according to claim 11 , wherein the first contact portion comprises a concave-convex top surface disposed along a periphery of the first insulating structure.