Patent ID: 8669560

Claim:
A light-emitting device, comprising: a support member; a light-emitting structure on the support member, the light-emitting structure including a first semiconductor layer, a first intermediate layer, an active layer, a second intermediate layer, and a second semiconductor layer; and a buffer layer interposed between the support member and the light-emitting structure, wherein at least one of the first and second intermediate layers comprises at least four layers, wherein the at least four layers have different band gaps from each other, wherein, among the at least four layers, a layer having the largest band gap contacts a layer having the smallest band gap, wherein the first intermediate layer is between the first semiconductor layer and the active layer, wherein the second intermediate layer is between the second semiconductor layer and the active layer, wherein the first and second intermediate layers contact the active layer, wherein the layer having the largest band gap includes A1GaN, and wherein the layer having the smallest band gap includes InN.