Patent ID: 8110841

Claim:
A nitride based light emitting device comprising: a first conductive semiconductor layer connected to a first electrode; a second conductive semiconductor layer connected to a second electrode; an active layer located between the first conductive semiconductor layer and the second conductive semiconductor layer, the active layer comprising a quantum well structure, wherein the active layer comprises a barrier layer and a well layer; a plurality of first insertion layers located between the first conductive semiconductor layer and the active layer or between the second conductive semiconductor layer and the active layer, the plurality of first insertion layers having an energy band gap between the energy band gap of the barrier layer and the energy band gap of the well layer, wherein at least two of the plurality of first insertion layers have substantially the same thickness and substantially the same energy band gap, and wherein the plurality of first insertion layers comprise GaInN; and a plurality of second insertion layers located adjacent to the plurality of first insertion layers and having a greater energy band gap than that of the first insertion layer, wherein the plurality of first and second insertion layers are alternately arranged, and wherein the plurality of first insertion layers are configured to relieve strain due to the lattice mismatch between the first conductive semiconductor layer and the active layer.