Patent ID: 7459326

Claim:
A method for producing an epitaxial substrate for a compound semiconductor light-emitting device comprising: a double-hetero light-emitting layer structure including a pn junction; and a p-type layer side layer structure formed in contact with the light-emitting layer structure including in order from the layer in contact with the light-emitting layer structure an n-type first layer represented by In x Al y Ga z N (x+y+z=1, 0≦x≦1, 0≦y≦1, 0≦z≦1), a p-type second layer represented by In u Al v Ga w N (u+v+w=1, 0≦u≦1, 0≦v≦1, 0≦w≦1) and a p-type third layer represented by In p Al q Ga r N (p+q+r=1, 0≦p≦1, 0≦q≦1, 0≦r≦1), each of the three layers being formed in contact with its neighbor; said method comprising: growing the substrate at a growth temperature T 1 of the first layer and a growth temperature of T 2 of the second layer are made to satisfy the relationship T 1 ≦T 2 .