Patent ID: 8525203

Claim:
A semiconductor light emitting device, comprising: an n-type semiconductor layer including a nitride semiconductor; a p-type semiconductor layer including a nitride semiconductor; a light emitting portion provided between the n-type semiconductor layer and the p-type semiconductor layer and including a quantum well layer; a first layer provided between the light emitting portion and the p-type semiconductor layer, the first layer including Al x1 Ga 1-x1 N, where first Al composition ratio x 1 is an atomic ratio of Al among group III elements, the first layer being doped with Mg; a second layer provided between the first layer and the p-type semiconductor layer, the second layer including Al x2 Ga 1-x2 N, where second Al composition ratio x 2 is an atomic ratio of Al among group III elements, the second Al composition ratio x 2 being higher than the first Al composition ratio x 1 ; and an intermediate layer provided between the first layer and the light emitting portion, the intermediate layer having a thickness not smaller than 3 nanometers and not larger than 8 nanometers and including In z1 Ga 1-z1 N, where 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.