Patent ID: 8247792
Filing Date: 2012-08-21
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 a first nitride-based semiconductor layer and a second nitride-based semiconductor layer, the first nitride-based semiconductor layer being doped with an n-type impurity, the second nitride-based semiconductor layer comprising a lower doping concentration than that of the first nitride-based semiconductor layer, and a second modulation doped layer comprising a third nitride-based semiconductor layer and a fourth nitride-based semiconductor layer, the third nitride-based semiconductor layer being doped with an n-type impurity, the fourth nitride-based semiconductor layer comprising a lower doping concentration than that of the third nitride-based semiconductor layer, wherein the first modulation doped layer and the second modulation doped layer comprise In, respectively, and wherein an amount of In in the first modulation doped layer is different from an amount of In in the second modulation doped layer.