Patent ID: 7781791

Claim:
A semiconductor light emitting element comprising: a substrate; and an n-type semiconductor layer, an active layer and a p-type semiconductor layer which are laminated on the substrate; wherein the semiconductor light emitting element includes a side surface extending in a lamination direction and constituted by the substrate, the n-type semiconductor layer, the active layer and the p-type semiconductor layer, the side surface being formed with a plurality of projections except for the active layer, the plurality of projections being provided on the substrate, the n-type semiconductor layer and the p-type semiconductor layer, wherein, when a wavelength of light emitted from the active layer is expressed by λ and index of refraction of either one of the n-type semiconductor layer and the p-type semiconductor layer is expressed by n, average W A of widths at bottoms of the projections satisfies: W A ≧λ/n.