Patent ID: 8314414

Claim:
A light emitting device comprising: a first conductive semiconductor layer; a second conductive semiconductor layer; and an active layer interposed between the first and second conductive semiconductor layers, wherein the first conductive semiconductor layer, the active layer, and the second conductive semiconductor layer include Al, wherein the second conductive semiconductor layer has Al content higher than Al content of the first conductive semiconductor layer, wherein the first conductive semiconductor layer has Al content higher than Al content of the active layer, wherein the active layer includes a plurality of quantum well layers and a plurality of barrier layers, wherein the quantum well layers have Al content lower than Al content of the barrier layers, and wherein the second conductive semiconductor layer includes a first layer and a second layer, wherein Al content of the first layer is different from Al content of the second layer, and wherein each of the quantum well layers has a plurality of layers and at least one of the plurality of quantum well layers include a layer without Al.