Patent ID: 8546846

Claim:
A nitride semiconductor light emitting device comprising: n-type and p-type nitride semiconductor layers; an active layer disposed between the n-type and p-type nitride semiconductor layers and having a structure in which a plurality of quantum barrier layers and one or more quantum well layers are alternately stacked; and an electron blocking layer disposed between the active layer and the p-type nitride semiconductor layer, wherein the electron blocking layer has a superlattice structure in which two or more layers having different compositions are alternately stacked, an absolute value of a net polarization mismatch between a material, the material having a composition corresponding to an average composition of the superlattice structure, and a quantum barrier layer adjacent to the electron blocking layer among the plurality of quantum barrier layers is less than two thirds (⅔) of an absolute value of a net polarization mismatch between Al x Ga 1-x N (0<x<1) having bandgap energy equal to that of the material and a composition different thereto and the adjacent quantum barrier layer, and the electron blocking layer includes a polarization matching layer disposed between the superlattice structure and the adjacent quantum barrier layer so as to be in contact with the adjacent quantum barrier layer and having a net polarization equal to that of the adjacent quantum barrier layer.