Patent ID: 7501664

Claim:
A III-nitride compound semiconductor light emitting device comprising: an active layer emitting light and being interposed between a lower contact layer made of n-GaN and an upper contact layer made of p-type III-nitride compound semiconductor layer, the active layer having at least one quantum well layer and one quantum barrier layer in contact with the quantum well layer, an n-type electrode layer formed on the lower contact layer, a lattice mismatch-reducing layer made of In x Ga 1-x N(x>0), grown on the lower contact layer and having a thickness of 200-1000 Å, the lattice mismatch-reducing layer having an energy band gap larger than the energy band gap of the quantum well layer and smaller than the energy band gap of the quantum barrier layer, an electron supply layer made of n-Al y Ga 1-y N(y≧0) and grown on the lattice mismatch-reducing layer, and a crystal restoration layer made of In z Ga 1-z N(z>0), grown on the electron supply layer and in contact with the active layer.