Patent ID: 8253151

Claim:
A semiconductor light emitting device, comprising: a substrate; a first gallium nitride based semiconductor layer doped with a first dopant on the substrate; an active layer on the first gallium nitride based semiconductor layer, the active layer including an InGaN material, and a first uneven structure having at least one first inclined surface; and a second gallium nitride based semiconductor layer doped with a second dopant on the active layer, wherein the active layer includes at least one in-rich region at the at least one first inclined surface of the first uneven structure, and the first gallium nitride based semiconductor layer comprises a second inclined surface with the active layer formed by protrusions, wherein the active layer comprises five to nine periods, and one period includes a well and a barrier, wherein a distance between an uppermost portion of the second inclined surface and a lowermost portion of the second inclined surface in a vertical direction is greater than a thickness of the one period of the active layer, and wherein the active layer comprises a plurality of vertical distances of different thicknesses.