Patent ID: 7939833

Claim:
A nitride semiconductor light emitting device comprising: a substrate; and a nitride semiconductor lamination portion provided on the substrate, the nitride semiconductor lamination portion comprising an active layer in which at least a light emitting portion is formed, the active layer being constituted with a multiple quantum well structure formed by laminating well layers made of In x Ga 1-x N (0<x≦1) and barrier layers made of Al y In z Ga 1-y-z N (0≦y<1, 0≦z<1, 0≦y+z<1, z<x) alternately, wherein one of the well layers is divided at least into a first well layer and a second well layer by a thin film barrier layer made of Al v In w Ga 1-v-w N (0≦v<1, 0≦w<1, 0≦v+w<1, w<x), the thin film barrier layer being formed so as to have a thickness of one atomic layer or more and 20 Angstroms or less, wherein each of the first well layer and the second well layer has a thickness that is (b 1 +10) Angstroms or more and 100 Angstroms or less, and wherein the thickness of the film barrier layer is b 1 Angstroms, and a thickness of the barrier layer is 50 Angstroms or more and 100 Angstroms or less.