Patent ID: 6943366

Claim:
A substrate for a semiconductor light-emitting element comprises, on a set base material, a group III nitride underlayer which contains at least Al, said group Ill nitride underlayer having a dislocation density of ≦1×10 11 /cm 2 and a (002) plan X-ray rocking curve half-width value of ≦200 seconds, a p-type semiconductor layer group is formed above said group III nitride underlayer and comprises a group III nitride having Ga content relative to the total group III elements of ≧50% and a carrier density of ≧1×10 16 /cm 3 , a light-emitting layer is formed on said p-type semiconductor layer and has the form of insular crystals comprising a group III nitride and produces quantum effects, and an n-type semiconductor layer group is formed on said light-emitting layer and has a Ga content relative to the total group III elements of ≧50%.