Patent ID: 7560740
Filing Date: 2009-07-14
Classification: H01L

Abstract:
1. A light-emitting device comprising: a GaN substrate; an n-type nitride semiconductor layer on a first main surface side of said GaN substrate; a p-type nitride semiconductor layer positioned further from said GaN substrate compared to said n-type nitride semiconductor layer; and a light-emitting layer positioned between said n-type nitride semiconductor layer and said p-type nitride semiconductor layer, wherein said p-type nitride semiconductor layer side is down-mounted and light is released from a second main surface, which is a main surface opposite from said first main surface of said GaN substrate; a plurality of grooves are formed on said second main surface of said GaN substrate; and an inner perimeter surface of each groove undergoes surface treatment in order to smooth said inner perimeter surface; each groove has a V-shaped cross section; each groove has a depth of at least 50 microns and no more than 300 microns; and along a thickness axis of said GaN substrate, a thickness of sections on which each groove is not formed is at least 100 microns and no more than 600 microns; and said GaN substrate is n-typed through oxygen doping, with an oxygen concentration that is at least 1 E17 oxygen atoms/cm