Patent ID: 8716693

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 the 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 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, wherein the second conductive semiconductor layer includes a first layer and a second layer, wherein the second layer of the second conductive semiconductor layer has a thickness of about 800 Å to about 1200 Å, and the first layer of the second conductive semiconductor layer has a thickness of about 200 Å to 300 Å, and wherein Al content of the first layer is different from Al content of the second layer.