Light emitting device, having protrusions from a conductive support member, lighting emitting device package, and lighting system
Disclosed is a light emitting device. The light emitting device includes a light emitting structure layer including a first semiconductor layer, an active layer, and a second semiconductor layer, an electrode electrically connected to the first semiconductor layer, an electrode layer under the light emitting structure layer, and a conductive support member under the electrode layer. The conductive support member includes a protrusion projecting from at least one edge.
1. A light emitting device comprising: a light emitting structure layer including a first semiconductor layer, a second semiconductor layer under the first semiconductor layer, and an active layer between the first and second semiconductor layers;
an electrode electrically connected to the first semiconductor layer;
an electrode layer under the light emitting structure layer; and
a conductive support member under the electrode layer,
wherein the conductive support member includes a protrusion protruded from at least one edge of the conductive support member,
wherein the protrusion includes a mixture of materials of the electrode layer and the conductive support member, and
wherein the protrusion is randomly protruded from an upper edge of the conductive support member.
2. The light emitting device of claim 1 , wherein the protrusion includes alloys.
3. The light emitting device of claim 1 , wherein the protrusion has a height of 10 μm or less.
4. The light emitting device of claim 1 , wherein the protrusion is located adjacent to an outer sidewall of the light emitting structure layer at a distance of 1 μm or more.
5. The light emitting device of claim 1 , wherein the electrode layer includes a plurality of conductive layers between the light emitting structure layer and the conductive support member.
6. The light emitting device of claim 5 , further comprising a channel layer having an inner portion between the electrode layer and a bottom surface of the light emitting structure layer and an outer portion extending beyond an outer sidewall of the light emitting structure layer from the inner portion of the channel layer.
7. The light emitting device of claim 6 , wherein the protrusion protrudes beyond a surface of the channel layer.
8. The light emitting device of claim 1 , wherein the protrusion is spaced apart from a lateral surface of the light emitting structure layer.
9. The light emitting device of claim 1 , wherein the protrusion includes a first protrusion protruding from the upper edge of the conductive support member.
10. The light emitting device of claim 1 , wherein the protrusion protrudes toward an outer sidewall of the light emitting structure layer.
11. The light emitting device of claim 10 , wherein the protrusion has a height lower than a height of an upper end of the light emitting structure layer.
12. The light emitting device of claim 11 , wherein the protrusion has the height higher than a height of the active layer.
13. The light emitting device of claim 1 , wherein the protrusion includes a bur.
14. The light emitting device of claim 1 , wherein the conductive support member has a width greater than a width of the light emitting structure layer.
15. The light emitting device of claim 1 , wherein the conductive support member includes an inner portion under the light emitting structure layer and an outer portion extending beyond an outer sidewall of the light emitting structure layer and from the inner portion of the conductive support member,
wherein the outer portion of the conductive support member is located at lower than a bottom surface of the light emitting structure layer, and
wherein the protrusion protrudes from at least one of a top surface and a sidewall surface of the outer portion of the conductive support member.
16. The light emitting device of claim 1 , wherein the protrusion protrudes upwardly from an outer edge of a flat surface of an outer portion of the conductive support member.
17. The light emitting device of claim 1 , further comprising a concave part recessed inward from an outer sidewall of the conductive support member.
18. The light emitting device of claim 17 , wherein the protrusion is located adjacent to the concave part of the conductive support member, and
wherein an outer edge of a flat top surface of an outer portion of the conductive support member is disposed between the protrusion and the concave part.
19. The light emitting device of claim 17 , wherein a depth of the concave part gradually increases from a corner to a central portion of the concave part.
20. The light emitting device of claim 1 , wherein the protrusion includes a first protrusion protruded from an outer edge of a flat bottom surface of the outer portion of the conductive support member and a second protrusion protruded from an outer edge of a flat top surface of the outer portion of the conductive support member, and
wherein the first protrusion and the second protrusion are disposed in opposite directions to each other.