US Patent 9269867 Light emitting device and method of fabricating the same

A light-emitting device according to an exemplary embodiment of the present invention includes a first conductivity-type semiconductor layer disposed on a substrate; an active layer disposed on the first conductivity-type semiconductor layer; a second conductivity-type semiconductor layer disposed on the active layer; and an irregular convex-concave pattern disposed on a surface of the first conductivity-type semiconductor layer. The irregular convex-concave pattern includes convex portions and concave portions, and the convex portions have irregular heights and the concave portions have irregular depths. The first conductivity-type semiconductor layer including the irregular convex-concave pattern is exposed from the active layer and the second conductivity-type semiconductor layer.