Patent ID: 7750355
Filing Date: 2010-07-06
Classification: B82Y,C30B,H01S

Abstract:
1. 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 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.