Patent ID: 8399896

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; an emitting layer including; a plurality of barrier layers provided between the n-type semiconductor layer and the p-type semiconductor layer, the barrier layers including a nitride semiconductor; and a well layer provided between the plurality of barrier layers, having a band gap energy smaller than a band gap energy of the barrier layers, and including InGaN, at least one of the plurality of barrier layers including: a first layer; a second layer provided closer to the p-type semiconductor layer than the first layer; and a third layer provided closer to the p-type semiconductor layer than the second layer, the second layer including Al x Ga 1−x N (0<x≦0.05), where x is an atomic ratio of Al among group III elements, a band gap energy of the second layer being larger than a band gap energy of the first layer and a band gap energy of the third layer, a total thickness of the first layer and the second layer being not larger than a thickness of the third layer.