Patent ID: 8759813

Claim:
A nitride semiconductor light-emitting element that emits light at a wavelength of 220 to 390 nm, comprising: an Al x Ga 1-x N (0<x<1) buffer layer formed on a substrate; an n-type In x Al y Ga 1-x-y N (0<x<0.1, 0<y<1) layer formed on the Al x Ga 1-x N buffer layer; a quantum-well light-emitting layer comprising an In x1 Al y1 Ga 1-x1-y1 N (0<x1<0.5, 0<y1<1) quantum well layer and an In x2 Al y2 Ga 1-x2-y2 N (0<x2<0.3, 0<y2<1, x1>x2, y1<y2) barrier layer formed on the n-type InAlGaN layer; a p-type In x Al y Ga 1-x-y N (0<x<0.1, 0<y<1) layer formed on the InAlGaN quantum-well light-emitting layer; and a multiquantum-barrier electron-blocking layer formed on the p-type InAlGaN layer, wherein the multiquantum-barrier electron-blocking layer is formed by alternately layering In x1 Al y1 Ga 1-x1-y1 N (0<x1<0.1, 0<y1<1) barrier layers and In x2 Al y2 Ga 1-x2-y2 N (0<x2<0.3, 0<y2<1, x1<x2, y1>y2) valley layers for the same number of periods or a 1st number of periods and a 2nd number of periods that differs from the 1st number of periods; and wherein the number of periods increases or decreases in a stepwise manner from the quantum-well light-emitting layer side to the multiquantum-barrier electron-blocking layer side.