Patent ID: 8338853

Claim:
A substrate for forming a light-emitting layer, comprising: a single-crystal substrate; an oriented microcrystal layer disposed on the single-crystal substrate; an intermediate layer disposed on the oriented microcrystal layer; a light-emitting layer comprising a nitride semiconductor disposed on the intermediate layer by means of a vapor-phase growth method; and a clad layer disposed on said light-emitting layer, wherein said oriented microcrystal layer contains a plurality of crystals, and a proportion of said crystals, in which one of crystal axes is oriented perpendicular with respect to said single-crystal substrate, is 5-9 out of 10, and an average of the crystal grain diameters of the respective crystals, contained in said oriented microcrystal layer, is 1-1,000 nm; and wherein said light-emitting layer has a band gap energy smaller than that of said intermediate layer and than that of said clad layer.