Patent ID: 8324610

Claim:
A semiconductor light emitting device, comprising: a plurality of first conductive type semiconductor layers; a plurality of second conductive type semiconductor layers on the plurality of first conductive type semiconductor layers; an active layer between the plurality of first conductive type semiconductor layers and the plurality of second conductive type semiconductor layers, wherein the active layer includes a plurality of quantum barrier layers and a plurality of quantum well layers; a first electrode connected to at least one of the plurality of first conductive type semiconductor layers; and a second electrode connected to at least one of the plurality of second conductive type semiconductor layers, wherein the plurality of first conductive type semiconductor layers includes a first AlGaN based layer and a second AlGaN based layer between the first AlGaN based layer and the active layer, wherein the first AlGaN based layer has a thickness thicker than that of the second AlGaN based layer, wherein the plurality of quantum well layers of the active layer include an InAlGaN layer, wherein the plurality of second conductive type semiconductor layers include a third AlGaN based layer and a fourth AlGaN based layer between the third AlGaN based layer and the active layer.