Patent ID: 7750355

Claim:
A light emitting device structure comprising a gallium-containing nitride substrate, an n-type gallium-containing nitride semiconductor layer or layers, a gallium-containing nitride semiconductor active layer, a p-type gallium-containing nitride semiconductor layer or layers formed on said substrate by a vapor phase growth, and either an undoped GaN, AlN or AlGaN intermediate layer formed between the n-type gallium-containing nitride semiconductor layer or layers and the gallium-containing nitride semiconductor active layer or an AlxGa1-xN protective layer, wherein 0≦x≦1, formed on the gallium-containing nitride semiconductor active layer, wherein said substrate is obtained from a gallium-containing nitride bulk single crystal prepared by a supercritical ammonia method, the substrate is provided with an epitaxial growth face of A-plane with a dislocation density of 10 5 /cm 2 or less and comprises an alkali metal element, said light emitting device is a semiconductor laser device and is formed on said A-plane of the bulk single crystal GaN substrate, and a light emitting face of a resonator of the light emitting device is M-plane, on which an end face film is formed, and wherein the intermediate layer or the protective layer is formed by a supercritical ammonia method at 600° C. or less and comprises an alkali metal element.