Patent ID: 8106419

Claim:
A group-III nitride compound semiconductor light-emitting device comprising: a substrate; an intermediate layer that is made of a group-III nitride compound, covers an entire upper surface of the substrate, has substantially uniform thickness, and is formed on the substrate by activating and reacting gas including a group-V element with a metal material in plasma; and an n-type semiconductor layer, a light-emitting layer, and a p-type semiconductor layer that are made of group-III nitride compound semiconductors and are sequentially formed on the intermediate layer, wherein nitrogen is used as the group-V element, and a thickness of the intermediate layer is in the range of 20 to 80 nm, wherein the intermediate layer has high crystallinity wherein a half width of an XRC spectrum of the (0002) plane of an undoped GaN layer is less than 150 arcsec, and a half width of an XRC spectrum of the (10-10) plane is less than 350 arcsec.