Patent ID: 7282747

Claim:
A light-emitting module that emits light, comprising: a semiconductor light-emitting element operable to emit light; and a sealing member operable to seal said semiconductor light-emitting element with materials that transmit the light emitted from said light-emitting module, wherein said semiconductor light-emitting element comprises: a sapphire substrate that transmits light toward said sealing member, the transmitted light sent from a facing face of the sapphire substrate facing said sealing member, a sub-wavelength grating for reducing reflection of light provided on the facing face in grid periods shorter than a wavelength of the light transmitted through said sapphire substrate, and a semiconductor layer that is formed on a rear face opposing the facing face in said sapphire substrate by crystal growth and emits light toward said sapphire substrate; wherein the sub-wavelength grating includes a plurality of convex portions protruding in the direction perpendicular to the facing face, the plurality of convex portions is arranged in grating intervals shorter than half-wavelength of the light transmitted through said sapphire substrate, and the height of the convex portion is longer than half-wavelength of the light transmitted through said sapphire substrate.