Patent ID: 8642992

Claim:
A Group III nitride compound semiconductor light emitting device comprising: an n-type semiconductor layer, an active layer composed of a multiple quantum-well structure laminated on said n-type semiconductor layer, a first p-type semiconductor layer laminated on said active layer, and a second p-type semiconductor layer laminated on said first p-type semiconductor layer, wherein said first p-type semiconductor layer is a superlattice structure in which an undoped film that has a composition of Al x Ga 1-x N (x indicating composition ratio, being within a range 0<x≦0.4) and that contains no dopant, and a doped film that has a composition of Al y Ga 1-y N (y indicating composition ratio, being within a range 0≦y<0.4) and that contains a dopant, are alternately laminated a plurality of times; an Al content in the doped film in the first p-type semiconductor layer is less than the Al content in the undoped film; a first surface film in said first p-type semiconductor layer being in direct contact with said active layer is constituted by a first undoped film of the first p-type semiconductor layer; and a second surface film in said first p-type semiconductor layer being in direct contact with said second p-type semiconductor layer is constituted by a second undoped film of the first p-type semiconductor layer.