Light-emitting structure

1. A light-emitting structure, comprising:

a substrate;

a first unit and a second unit, separately formed on the substrate;

a trench between the first unit and the second unit, comprising a bottom portion exposing the substrate

an insulating layer arranged on the trench, conformably covering the bottom portion and sidewalls of the first unit and the second unit; and

an electrical connection, conformably covering the insulating layer, electrically connecting the first unit and the second unit and comprising a bridging portion and a joining portion extending from the bridging portion;

wherein the bridging portion is wider than the joining portion and the bridging portion covers the trench, and the joining portion covers the first unit and the second unit.

2. The light-emitting structure of claim 1 , wherein the joining portion has a cross section area equal to or close to that of the bridging portion.

3. The light-emitting structure of claim 1 , wherein the joining portion and the bridging portion have similar thicknesses.

4. The light-emitting structure of claim 1 , wherein the joining portion is electrically connected to an anode or a cathode.

5. The light-emitting structure of claim 1 , wherein the bridging portion is thinner than the joining portion.

6. A light-emitting structure, comprising:

a substrate;

a first unit and a second unit separately formed on the substrate, wherein each of the first unit and the second unit comprises a lower layer composed of a first-type semiconductor and an upper layer stacked on the lower layer and composed of a second-type semiconductor, the lower layer of the first unit comprises a first top surface and a first sidewall, the upper layer of the second unit comprises a second top surface and the lower layer of the second unit comprises a second sidewall;

a trench between the first unit and the second unit, comprising a bottom portion exposing the substrate;

an isolation layer arranged on the trench, contiguously covering the second top surface, the second sidewall and the bottom portion and exposing a portion of the first sidewall; and

an electrical connection arranged on and covering the isolation layer, contacting the exposed portion of the first sidewall with the first-type semiconductor and the second top surface with the second-type semiconductor to electrically connect the first unit and the second unit in series.

7. The light-emitting structure of claim 6 , wherein the isolation layer exposes the first top surface, the electrical connection contacts the first top surface.

8. The light-emitting structure of claim 6 , wherein the electrical connection has a greater contact area with the first unit than the second unit.

9. The light-emitting structure of claim 6 , wherein the first unit and the second unit are spatially separated by the trench.

10. The light-emitting structure of claim 6 , wherein the lower layers of the first unit and the second unit are separated from each other.

11. The light-emitting structure of claim 6 , further comprising a current network formed on the second top surface, and the electrical connection contacts the current network.

12. The light-emitting structure of claim 1 , wherein the sidewalls of the first unit and the second unit are inclines.

13. The light-emitting structure of claim 1 , wherein the joining portion comprises a first joining portion and a second joining portion, wherein each of the first unit and the second unit comprises a first conductivity layer, an active layer, and a second conductivity layer, the first joining portion connects to the first conductivity layer of the first unit and the second joining portion connects to the second conductivity layer of the second unit.