Patent ID: 8421056

Claim:
A light-emitting device epitaxial wafer, comprising: an n-type substrate; an n-type cladding layer stacked on the n-type substrate; a light-emitting layer comprising a quantum well structure stacked on the n-type cladding layer; and a p-type cladding layer stacked on the light-emitting layer, wherein the n-type cladding layer comprises an epitaxial layer doped with a mixture of 2 or more n-type dopants including Si, and is not less than 250 nm and not more than 750 nm in thickness, and wherein the epitaxial layer doped with a mixture of 2 or more n-type dopants including Si is formed to gradually increase the Si concentration from its n-type substrate side to light-emitting layer side, while gradually decreasing the concentration of the n-type dopant other than Si from the n-type substrate side to light-emitting layer side.