Patent ID: 8664638

Claim:
A light emitting diode, comprising: a substrate; a buffer layer disposed on the substrate; a gallium nitride-based n-type contact layer disposed on the buffer layer; a gallium nitride based p-type contact layer disposed on the gallium nitride-based n-type contact layer; an active layer interposed between the gallium nitride-based n-type contact layer and the gallium nitride-based p-type contact layer; a gallium nitride-based first lower semiconductor layer interposed between the buffer layer and the gallium nitride-based n-type contact layer; a gallium nitride-based first interlayer interposed between the gallium nitride-based first lower semiconductor layer and the gallium nitride-based n-type contact layer; and a gallium nitride-based second interlayer interposed between the gallium nitride-based first interlayer and the gallium nitride-based n-type contact layer, wherein the gallium nitride-based second interlayer has higher dislocation density than that of the gallium nitride-based first lower semiconductor layer and has dislocation density different from that of the gallium nitride-based first interlayer, wherein the gallium nitride-based first interlayer comprises a single composition and has lower dislocation density than that of the buffer layer and has higher dislocation density than that of the gallium nitride-based first lower semiconductor layer, and wherein the gallium nitride-based first interlayer comprises the same composition as that of the gallium nitride-based n-type contact layer.