Patent ID: 8421085

Claim:
A semiconductor light-emitting device comprising: a first semiconductor layer of a first conductivity type; a second semiconductor layer of a second conductivity type; a light-emitting layer provided between the first semiconductor layer and the second semiconductor layer; a third semiconductor layer provided on opposite side of the first semiconductor layer from the light-emitting layer, having an impurity concentration lower than an impurity concentration of the first semiconductor layer, and including an opening exposing a part of the first semiconductor layer; and a first electrode in contact with the first semiconductor layer through the opening, the third semiconductor layer further including a rough surface portion, the rough surface portion being provided on opposite side from the first semiconductor layer and including a surface asperity larger than wavelength in the third semiconductor layer of peak wavelength of emission light emitted from the light-emitting layer, wherein the first semiconductor layer includes a first semiconductor layer surface asperity provided in a region of the first semiconductor layer in contact with the first electrode and being smaller than the surface asperity of the rough surface portion.