Patent ID: 7982210
Filing Date: 2011-07-19
Classification: H01L

Abstract:
1. A light emitting diode (LED), comprising: an n-type contact layer; a p-type contact layer; and an active region of a multiple quantum well structure comprising an InGaN well layer and being interposed between the n-type contact layer and the p-type contact layer, wherein the n-type contact layer comprises a first modulation doped layer comprising first InGaN layers and second InGaN layers alternately laminated, the first InGaN layers being doped with an n-type impurity, the second InGaN layers comprising a lower doping concentration than that of the first InGaN layers, and a second modulation doped layer comprising third InGaN layers and fourth InGaN layers alternately laminated, the third InGaN layers being doped with an n-type impurity, the fourth InGaN layers comprising a lower doping concentration than that of the third InGaN layers, the first InGaN layers and the second InGaN layers in the first modulation doped layer have the same composition, and the third InGaN layers and the fourth InGaN layers in the second modulation doped layer have the same composition; the second modulation doped layer is interposed between the first modulation doped layer and the active region; and an n-electrode contacts the first modulation doped layer.