Patent ID: 8124969

Claim:
A ZnO-based semiconductor light emitting element comprising: a sapphire A-plane substrate made of an α-sapphire single crystal and having a principal surface lying in an A-plane {11-20} of the α-sapphire single crystal; and a ZnO-based semiconductor layer formed on the sapphire A-plane substrate, wherein the sapphire A-plane substrate has a thickness of 50 to 200 μm and is surrounded by two parallel first side edges and two parallel second side edges orthogonal to the two parallel first side edges, the two parallel first side edges forming an angle in a range of 52.7° to 54.7° or in a range of 35.3° to 37.3° with respect to an m-axis of the α-sapphire single crystal that is orthogonal to a c-axis of the α-sapphire single crystal.