Patent ID: 8901595

Claim:
A semiconductor light emitting device, comprising: an n-type semiconductor layer including a nitride semiconductor; a p-type semiconductor layer of a nitride semiconductor; a light emitting portion provided between the n-type semiconductor layer and the p-type semiconductor layer and including a plurality of quantum well layers, each of the quantum well layers including a nitride semiconductor; a first intermediate region provided between the light emitting portion and the p-type semiconductor layer, the first intermediate region including: a first region including Al x1 Ga 1-x1 N, wherein in the first region a first Al composition ratio x 1 is an atomic ratio of Al among group III elements, the first Al composition ratio x 1 being not lower than 0.001 and not higher than 0.05, the first region having a thickness not thinner than 0.5 nanometer, and a second region provided between the first region and the p-type semiconductor layer, the second region contacting the p-type semiconductor layer, the second region including Al x2 Ga 1-x2 N, wherein in the second region a second Al composition ratio x 2 is an atomic ratio of Al among group III elements, the second Al composition ratio x 2 being not lower than 0.1 and not higher than 0.2, a concentration of a p-type impurity in the second region being higher than a concentration of a p-type impurity in the first region; and a second intermediate region provided between the first region and the light emitting portion, the second intermediate region contacting one of the quantum well layers, the second intermediate region having a thickness not thinner than 3 nanometers and not thicker than 8 nanometers and including In z1 Ga 1-z1 N, wherein in the second intermediate region an In composition ratio z 1 is an atomic ratio of In among group III elements, the In composition ratio z 1 being not lower than 0 and lower than 1.