Patent ID: 7576363

Claim:
A group III nitride compound semiconductor light emitting device comprising: an n-type semiconductor layer; a p-type net conductivity semiconductor layer comprising a superlattice structure comprising a plurality of first and second layers, said first layers comprising at least Al and said second layers having a composition differing from a composition of the first layers, said plurality of first and second layers being laminated alternately and repetitively; and an active layer interposed between the n-type semiconductor layer and the p-type net conductivity semiconductor layer, wherein a layer of said first layers located closest to the active layer has an Al composition that is less than an Al composition of other layers of said first layers, wherein said layer of said first layers located closest to the active layer comprises one of: no doping; and a doping amount of a p-type impurity that is less than a doping amount of a p-type impurity of said other layers of said first layers, and wherein the first layers comprise AlGaN and the second layers comprise InGaN.