Patent ID: 8278646
Filing Date: 2012-10-02
Classification: H01L

Abstract:
1. A light emitting device comprising: a first nitride semiconductor layer; an active layer on the first nitride semiconductor layer; a second nitride semiconductor layer on the active layer; and an electrode on the second nitride semiconductor layer; wherein the active layer includes a quantum well structure for emitting light; wherein the first nitride semiconductor layer includes a super lattice structure having at least two layers; and wherein the second nitride semiconductor layer includes a p-type impurity, the p-type impurity having a doping profile comprising a plurality of peaks through the depth of the second nitride semiconductor layer, wherein the second nitride semiconductor layer comprises a periodic structure, and wherein a period of the periodic structure comprises a p-doped first GaN layer and a p-doped second GaN layer, wherein the p-doped second GaN layer includes a material selected from the group consisting of In and Al, and wherein each peak of the plurality of peaks occurs in a p-doped first GaN layer of the periodic structure.