Patent ID: 9419175
Filing Date: 2016-08-16
CPC Classification: B82Y,H01L,H01S

Claim Text:
1. A semiconductor light emitting device comprising: a metal layer being conductive; a first semiconductor layer of a first conductivity type containing a GaN crystal and receiving tensile stress in a (0001) plane; a second semiconductor layer of a second conductivity type, the second semiconductor layer being provided between the metal layer and the first semiconductor layer and containing a GaN crystal; a reflecting metal provided between the metal layer and the second semiconductor layer, the reflecting metal having direct connection with the second semiconductor layer; a light emitting layer provided between the first semiconductor layer and the second semiconductor layer, the light emitting layer containing a nitride semiconductor crystal; and a third semiconductor layer provided between the second semiconductor layer and the light emitting layer and relaxing tensile stress applied from the metal layer to the second semiconductor layer, the third semiconductor layer containing AlGaN crystal, the metal layer having a thermal expansion coefficient larger than a thermal expansion coefficient of the nitride semiconductor crystal, the first semiconductor layer having a first face and a second face, the first face facing the light emitting layer, the second face being opposite to the first face, and a light emitted from the light emitting layer being extracted through the second face.