Patent ID: 8587007

Claim:
A light emitting device comprising: a substrate; a plurality of convex portions protruding from a flat top surface of the substrate; a first semiconductor layer on the substrate; an active layer on the first semiconductor layer; a second conductive semiconductor layer on the active layer; and a transmissive electrode layer having a plurality of holes on the second conductive semiconductor layer, wherein each hole has a width narrower than a width of each convex portion, wherein a circumferential surface of each convex portion includes a continuous rounded surface, and a height of the convex portion is about 1.5 μm or less, wherein the first semiconductor layer includes a buffer layer, and the buffer layer has a thickness smaller than a height of the convex portion, wherein the substrate has the flat top surface between the plurality of convex portions protruding more than the flat top surface, and wherein the first semiconductor layer includes a plurality of dislocations having an interval greater than an interval between the convex portions.