Patent ID: 8120013

Claim:
A nitride semi-conductor light emitting device comprising; a p-type nitride semi-conductor layer, an n-type nitride semi-conductor layer; and a light emission layer which is interposed between said p-type nitride semi-conductor layer and said n-type nitride semi-conductor layer, said light emission layer having a quantum well structure with a barrier layer and a well layer; said barrier layer being formed of Al a Ga b In (1-a-b) N whose Al component is equal to or more than 60% (0.6≦a<1, 0<b<0.4, 1−a−b>0), and containing a first impurity at a concentration of A greater than zero; said well layer being formed of Al c Ga d In (1-c-d) N whose Al component is equal to or more than 35% (0.35≦c<1, c<a, 0<d<0.65, 1−c−d>0), and containing a second impurity at a concentration of B equal to or greater than zero; wherein said concentration of A is larger than that of B, in order that said barrier layer has a concentration of oxygen smaller than that in said well layer.