Patent ID: 7884351

Claim:
A nitride semiconductor light-emitting device, comprising: an n-type gallium nitride semiconductor region; a p-type gallium nitride semiconductor region; and an emission region having a quantum well structure provided between the n-type and the p-type gallium nitride semiconductor regions; wherein the quantum well structure includes a plurality of first well layers composed of In x Ga 1-x N, one or a plurality of second well layers composed of In y Ga 1-y N, and barrier layers composed of In z Ga 1-z N (0≦z≦1, z<x, z<y); the second well layer thickness is greater than the first well layer thickness; the barrier layers are arranged in alternation with the first and second well layers; and the emission wavelength of the first well layers approximately equals the emission wavelength of the second well layers at a given density of current applied to the nitride semiconductor light-emitting device.