Patent ID: 8338820

Claim:
A semiconductor light emitting device comprising: a first conductivity type semiconductor layer including a superlattice structure, first semiconductor layers and second semiconductor layers being alternately provided in the superlattice structure, the first semiconductor layers including a first nitride semiconductor and the second semiconductor layers including a second nitride semiconductor having a larger lattice constant than the first nitride semiconductor; a light emitting layer provided on the first conductivity type semiconductor layer and including a multi-quantum well structure, quantum well layers and barrier layers being alternately provided in the multi-quantum well structure, the quantum well layers including a third nitride semiconductor having a smaller lattice constant than the second nitride semiconductor and the barrier layers including a fourth nitride semiconductor having a smaller lattice constant than the third nitride semiconductor, at least one of the quantum well layers having lattice spacing equal to the lattice constant of the third nitride semiconductor; and a second conductivity type semiconductor layer provided on the light emitting layer.