Patent ID: 8305417

Claim:
A light-emitting device comprising: a substrate; a reflection layer that is provided on the substrate, and that reflects light in a wavelength band set in advance; and a light-emitting layer that is provided on the reflection layer, and that includes a light-emitting region emitting light having wavelengths overlapping in the wavelength band and a surface having unevenness at a plurality of distances from the reflection layer, the surface being provided on a side opposite to the reflection layer across the light-emitting region, the plurality of distances being set so that wavelengths forming standing waves depending on each of the distances in the wavelength band are interposed each other, wherein the light-emitting layer is formed on the reflection layer and includes a semiconductor layer that has the light-emitting region, and the surface having unevenness at the plurality of distances from the reflection layer is a surface of the semiconductor layer opposite to a surface of the semiconductor layer in contact with the reflection layer, and the light emitted by the light-emitting layer includes, within the wavelength band where the reflecting layer reflects light, a plurality of standing waves corresponding to concave portions of the surface having unevenness and a plurality of standing waves corresponding to convex portions of the surface having unevenness.