Patent ID: 6881601

Claim:
A method of manufacturing a nitride compound semiconductor having a stack of layers, the method including: growing a first layer having the composition expressed as InAlN on a substrate at a first temperature, growing a cap layer on the first layer, the cap layer grown at a second temperature substantially equal to or below the first temperature; and heat treating the first layer at a third temperature above the first temperature to form areas in the first layer where the composition is expressed as In X1 Al 1-X1 N(0<X1<1) and other areas in the first layer where the composition is expressed as In X2 Al 1-X2 N (0≦X2<X1<1), wherein the areas where the composition is expressed as In X1 Al 1-X1 N (0<X1<1) emit red light with a peak wavelength greater than or equal to 630 nm.