Light-emitting device

1. A light-emitting device, comprising:

a light-emitting stack comprising a first side, a second side opposite to the first side, and a third side connected to the first side and the second side;

a first electrode pad formed on the light-emitting stack;

a second electrode pad formed on the light-emitting stack, wherein the first electrode pad is closer to the first side than the second electrode pad;

a first extension electrode comprising a first section extended from the first electrode pad in a direction away from the third side, and a second section connected to the first section; and

a second extension electrode comprising a first branch and a second branch respectively extended from the second electrode pad;

wherein a distance between the first electrode pad and the third side is smaller than a distance between the second electrode pad and the third side;

wherein the second section comprises two ends toward the first side and the second side, respectively, and the two ends of the second section is between the first branch and the second branch.

2. The light-emitting device of claim 1 , wherein the first section is parallel to the first side.

3. The light-emitting device of claim 1 , wherein the first electrode pad is adjacent to the third side between the first side and the second side of the light-emitting stack.

4. The light-emitting device of claim 1 , wherein the first branch and the second branch are asymmetrical.

5. The light-emitting device of claim 1 wherein the two ends of the second section are aligned to each other in accordance with a line perpendicular to the first side.

6. The light-emitting device of claim 1 wherein the second section comprises a symmetrical shape.

7. The light-emitting device of claim 1 , wherein the first branch surrounds the second section.

8. The light-emitting device of claim 1 , further comprising a substrate configured to support the light-emitting stack, wherein the substrate comprises an uneven surface facing the light-emitting stack.

9. The light-emitting device of claim 1 , wherein the light-emitting stack comprises a fourth side opposite to the third side, and the first side, the second side, the third side and the fourth side form a rectangle.

10. The light-emitting device of claim 9 , wherein the first branch comprises a third section parallel to the third side and a fourth section connected to the third section and toward the first side.

11. A light-emitting device, comprising:

a light-emitting stack comprising a first side, a second side opposite to the first side, a third side connected to the first side and the second side, and a fourth side opposite to the third side, wherein the first side and the second side are shorter than the third side and the fourth side;

a first electrode pad formed on the light-emitting stack;

a second electrode pad formed on the light-emitting stack; and

a first extension electrode comprising a first section extended from the first electrode pad in a direction away from the third side, and a second section connected to the first section and extended to the second side;

wherein a distance between the first electrode pad and the third side is smaller than a distance between the second electrode pad and the third side.

12. The light-emitting device of claim 11 , further comprising a second extension electrode comprising a first branch and a second branch respectively extended from the second electrode pad.

13. The light-emitting device of claim 12 , wherein the first branch and the second branch are asymmetrical.

14. A light-emitting device, comprising:

a light-emitting stack comprising an lower semiconductor layer comprising a first portion and a second portion, an active layer disposed on the first portion of the lower semiconductor layer, and an upper semiconductor layer disposed on the active layer, wherein the second portion is exposed by the active layer, wherein the light-emitting stack comprises a first side, a second side opposite to the first side, a third side connected to the first side and the second side, and a fourth side opposite to the third side;

a first electrode pad disposed on the second portion of the lower semiconductor layer and adjacent to the third side;

a second electrode pad disposed on the upper semiconductor layer; and

a first extension electrode comprising a first section extended from the first electrode pad in a direction away from the third side, and a second section connected to the first section and extended to the second side;

wherein a distance between the first electrode pad and the third side is smaller than a distance between the second electrode pad and the fourth side.

15. The light-emitting device of claim 14 , further comprising a second extension electrode comprising a first branch and a second branch respectively extended from the second electrode pad.

16. The light-emitting device of claim 15 , wherein the first branch and the second branch are asymmetrical.

17. The light-emitting device of claim 16 , wherein the second section is disposed between the first branch and the second branch.

18. The light-emitting device of claim 14 , wherein the first side or the second side are shorter than the third side or the fourth side.

19. The light-emitting device of claim 14 , wherein a distance between the first electrode pad and the third side is smaller than a distance between the second electrode pad and the third side.