Patent ID: 8350250

Claim:
A nitride-based light emitting device comprising: a first-conductivity semiconductor layer; a second-conductivity semiconductor layer; an active layer arranged between the first-conductivity semiconductor layer and the second-conductivity semiconductor layer, the active layer comprising a quantum well layer and a quantum barrier layer; and an inter-layer arranged between the first-conductivity semiconductor layer and the active layer, the inter-layer comprising a plurality of first layers and second layers which are alternately arranged, wherein the energy band gap of each first layer of the plurality of first layers ranges between the energy band gap of the first-conductivity semiconductor layer and the energy band gap of the quantum well layer, wherein the first-conductivity semiconductor layer comprises an n-type layer, wherein each first layer has substantially the same thickness, and has a thickness in the range of 50 to 1000 Å, wherein each second layer of the plurality of second layers has substantially the same thickness, wherein the energy band gap of each second layer is substantially the same as that of the first-conductivity semiconductor layer or the second-conductivity semiconductor layer, wherein the inter-layer contacts the active layer, and wherein the inter-layer is configured to reduce strain on the active layer.