Patent ID: 7173287

Claim:
A semiconductor light-emitting device made of a group III-nitride compound semiconductor expressed as Al x Ga y In 1âˆ’xâˆ’y N (where 0â‰¦xâ‰¦1, 0â‰¦yâ‰¦1, and 0â‰¦x+yâ‰¦1), the semiconductor light-emitting device comprising: a substrate made of SiC; a semiconductor layer which is placed above the substrate and has a light-emitting region; a multi-layered reflective layer which is placed between the substrate and the semiconductor layer and which reflects light produced in the light-emitting region; and a phase matching layer which is placed between the substrate and the multi-layered reflective layer and which reflects light produced in the light-emitting region and matches a phase of light reflected from a lower boundary surface of the multi-layered reflective layer and a phase of light reflected from a lower boundary surface of the substrate among light produced in the light-emitting region, wherein a thickness of the phase matching layer is set so that a quantity of interfering light produced by the interference of light reflected from the lower boundary surface of the multi-layered reflective layer, light reflected from a lower boundary surface of the phase matching layer, and light reflected from the lower boundary surface of the substrate among light produced in the light-emitting region is locally maximized when the substrate has a predetermined thickness.