Patent ID: 7781777

Claim:
A pn junction type Group III nitride semiconductor light-emitting device comprising a light-emitting layer of multiple quantum well structure in which well layers and barrier layers including Group III nitride semiconductors are alternately stacked periodically between an n-type clad layer and a p-type clad layer which are formed on a crystal substrate and which include Group III nitride semiconductors, wherein a first end layer of the light-emitting layer is in contact with the n-type clad layer, and a second end layer of the light-emitting layer is in contact with the p-type clad layer, both the first and second end layers are barrier layers, and the second end layer is thicker than the barrier layer of the first end layer, wherein the barrier layers other than the second end layer have a thickness of 15 nm or more and 50 nm or less, and the second end layer has a thickness of 1.2 or more times and 2.5 or less times the thickness of the barrier layers other than the second end layer, and wherein the barrier layer of the second end layer includes n-type impurities.