Semiconductor light emitting device

1. A semiconductor light emitting device, comprising:

a light emitting structure including a first conductive semiconductor layer, a second conductive semiconductor layer under the first conductive semiconductor layer, and an active layer between the first conductive semiconductor layer and the second conductive semiconductor layer;

a first electrode on a region of a top surface of the first conductive semiconductor layer;

a second electrode layer under the light emitting structure;

a conductive support member under the second electrode layer; and

a light-transmitting layer including a first portion disposed under a periphery region of a bottom surface of the second conductive semiconductor layer,

wherein the second conductive semiconductor layer includes a plurality of recesses on a lower portion of the second conductive semiconductor layer,

wherein the second electrode layer includes a plurality of conductive layers having an uneven structure along the plurality of recesses,

wherein a top surface of the conductive support member has a width wider that of a top surface of the second conductive semiconductor layer,

wherein the light-transmitting layer includes a second portion extended outwardly from the bottom surface of the second conductive semiconductor layer,

wherein the second electrode layer includes an outer portion extended outwardly from the bottom surface of the second conductive semiconductor layer, and

wherein the outer portion of the second electrode layer is disposed under the second portion of the light-transmitting layer.

2. The semiconductor light emitting device according to claim 1 , wherein the second conductive semiconductor layer includes a plurality of contact regions spaced apart from each other between the plurality of recesses and the plurality of contact regions are contacted with the second electrode layer.

3. The semiconductor light emitting device according to claim 1 , wherein the plurality of contact regions are physically contacted with different regions of the second electrode layer.

4. The semiconductor light emitting device according to claim 2 , wherein the plurality of contact regions are formed at a regular interval.

5. The semiconductor light emitting device according to claim 4 , wherein each of the plurality of recesses comprises an inclined side surface with respect to a bottom surface of the plurality of contact regions of the second conductive semiconductor layer.

6. The semiconductor light emitting device according to claim 2 , wherein each of the plurality of recesses comprises an inclined side surface with respect to a bottom surface of the second conductive semiconductor layer.

7. The semiconductor light emitting device according to claim 5 , wherein the inclined side surface has an inclination angle less than 57 degrees with respect to a horizontal bottom surface of the second conductive semiconductor layer.

8. The semiconductor light emitting device according to claim 5 , wherein the plurality conductive layers includes a plurality of metal layers having the uneven structure by the plurality of recesses.

9. The semiconductor light emitting device according to claim 8 , wherein the plurality of metal layers includes at least three layers including Ti and Au material.

10. The semiconductor light emitting device according to claim 8 ,

wherein at least one of the first and second conductive semiconductor layers is formed of a GaAs-based semiconductor,

wherein the second electrode layer has a width wider than that of the top surface of the second conductive semiconductor layer, and

wherein the conductive support member includes Ge material having a thickness in a range of 30 μm to 150 μm.

11. A semiconductor light emitting device, comprising:

a light emitting structure including a first conductive semiconductor layer, a second conductive semiconductor layer under the first conductive semiconductor layer, and an active layer between the first conductive semiconductor layer and the second conductive semiconductor layer;

a first electrode on a region of a top surface of the first conductive semiconductor layer;

a second electrode layer under the light emitting structure;

a conductive support member under the second electrode layer; and

a light-transmitting layer including a first portion disposed under a periphery region of a bottom surface of the second conductive semiconductor layer,

wherein the second conductive semiconductor layer includes a plurality of recesses on a lower portion of the second conductive semiconductor layer,

wherein the second electrode layer includes a metal layer having an uneven structure corresponding to the plurality of recesses,

wherein the top surface of the first conductive semiconductor layer has an roughness,

wherein a top surface of the conductive support member has a width wider that of a top surface of the second conductive semiconductor layer,

wherein the light-transmitting layer includes a second portion extended outwardly from the bottom surface of the second conductive semiconductor layer,

wherein the second electrode layer includes an outer portion extended outwardly from the bottom surface of the second conductive semiconductor layer, and

wherein the outer portion of the second electrode layer is disposed under the second portion of the light-transmitting layer.

12. The semiconductor light emitting device according to claim 11 , wherein the light-transmitting layer includes an insulating material of silicon nitride.

13. The semiconductor light emitting device according to claim 11 ,

wherein at least one of the first and second conductive semiconductor layers is formed of a GaAs-based semiconductor, and

wherein the conductive support member includes Ge material having a thickness in a range of 30 μm to 150 μm.

14. The semiconductor light emitting device according to claim 13 , wherein a top surface of the second electrode layer has a width wider than that of a top surface of the second conductive semiconductor layer.

15. The semiconductor light emitting device according to claim 13 , wherein the second conductive semiconductor layer includes a plurality of contact regions spaced apart from each other between the plurality of recesses and the plurality of contact regions are contacted with the second electrode layer.

16. The semiconductor light emitting device according to claim 15 ,

wherein the plurality of contact regions are physically contacted with different regions of the second electrode layer, and

wherein each of the plurality of recesses comprises an inclined side surface with respect to the second conductive semiconductor layer.

17. A semiconductor light emitting device, comprising:

a light emitting structure including a first conductive semiconductor layer, a second conductive semiconductor layer under the first conductive semiconductor layer, and an active layer between the first conductive semiconductor layer and the second conductive semiconductor layer;

a first electrode on a region of a top surface of the first conductive semiconductor layer;

a second electrode layer under the light emitting structure;

a conductive support member under the second electrode layer; and

a light-transmitting layer including a first portion disposed under a periphery region of a bottom surface of the second conductive semiconductor layer,

wherein a lower portion of the light emitting structure includes a plurality of recesses,

wherein a top surface of the second electrode layer has a width wider than that of a top surface of the second conductive semiconductor layer,

wherein a top surface of the conductive support member has a width wider than that of a top surface of the second conductive semiconductor layer,

wherein the light-transmitting layer includes a second portion extended outwardly from the bottom surface of the second conductive semiconductor layer,

wherein the second electrode layer includes an inner portion formed in an uneven layer structure corresponding to the plurality of recesses and an outer portion formed in a flat layer structure under the light-transmitting layer, and

wherein the flat layer structure is extended outwardly from the uneven layer structure.

18. The semiconductor light emitting device according to claim 17 , wherein a bottom surface of the uneven layer structure corresponds to the plurality of recesses.

19. The semiconductor light emitting device according to claim 18 ,

wherein the second electrode layer includes a plurality of conductive layers, and

wherein the inner portion of the second electrode layer includes a plurality of protrusion regions contacted with the second semiconductor layer.