Patent ID: 7888670

Claim:
A nitride semiconductor light emitting device comprising: an n-type semiconductor region; an active layer formed on the n-type semiconductor region; a p-type semiconductor region formed on the active layer; an n-electrode disposed in contact with the n-type semiconductor region; a p-electrode formed on the p-type semiconductor region; and at least one intermediate layer formed in at least one of the n-type semiconductor region and the p-type semiconductor region, the intermediate layer disposed above the n-electrode, wherein the intermediate layer is formed of a multi-layer structure where at least three layers with different band gaps from one another are deposited, the multi-layer structure comprises one of an AlGaN layer/GaN layer/InGaN layer stack and an InGaN layer/GaN layer/AlGaN layer stack, and at least two of the AlGaN layer, the GaN layer and InGaN layer have a different concentration of dopant or a different doping type from one another.