Patent ID: 6844572

Claim:
A light emitting semiconductor device comprising a substrate and a compound semiconductor layer disposed on the substrate and represented by a general expression In x Ga y Al z N, wherein x+y+z=1, 0≦x≦1, 0≦y≦1, and 0≦z≦1, characterized in that: said substrate has a groove having an oblique plane corresponding to one of a plane inclined relative to a main plane of the substrate by 62 degrees and a plane inclined relative to the inclined plane in any direction within three degrees; said compound semiconductor layer includes a base layer disposed on said oblique plane and an active layer disposed on the base layer; and said active layer is formed of a well layer and a barrier layer alternately stacked; said well layer having a thickness of 2 to 10 nm, wherein said active layer has more than one well layer different in thickness.