Patent ID: 7964882

Claim:
A nitride semiconductor-based light emitting device having a wurtzite lattice structure with the Ga face, comprising: a substrate; a buffer layer formed on the substrate; a first p-type contact layer formed on the buffer layer; a second p-type contact layer formed on the first p-type contact layer; a first hole diffusion layer formed on the second p-type contact layer; a second hole diffusion layer formed on the first hole diffusion layer; a light emitting active region formed on the second hole diffusion layer; a second electron diffusion layer formed on the light emitting active region; a first electron diffusion layer formed on the second electron diffusion layer; a second n-type contact layer formed on the first electron diffusion layer; and a first n-type contact layer formed on the second n-type contact layer wherein the second p-type contact layer is formed of a material having a composition of Al x Ga 1-x N(0.1≦x≦0.5) doped with a magnesium atom at a concentration of 1×10 18 cm −3 or more, and the first hole diffusion layer is formed of a material having a composition of In y Ga 1-y N(0≦y ≦0.05) which is intentionally p-doped or undoped, the intentionally p-doped layer being doped with magnesium atoms at a concentration of 1×10 18 cm −3 or less.