Patent ID: 7547910

Claim:
A semiconductor light-emitting device, comprising: a gallium nitride cladding layer of a first conductivity type, with a threading dislocation density of 1×10 7 cm −2 or less; a gallium nitride cladding layer of a second conductivity type; and an active region, having a quantum well structure composed of a plurality of well layers and a plurality of barrier layers, provided between the first-conductivity-type and the second-conductivity-type gallium nitride cladding layers; wherein the quantum well structure is provided so as to emit light having a peak wavelength within a wavelength range of 420 nm to 490 nm inclusive, the well layers each include an un-doped In X Ga 1-X N (0<X<0.14, X: strained composition) region, and the barrier layers include an un-doped In Y Ga 1-Y N (0≦Y≦0.05, Y: strained composition, Y<X) region.