Patent ID: 7968864

Claim:
A group-III nitride light-emitting device comprising: a group-III nitride substrate; a gallium nitride based semiconductor region grown on the group-III nitride substrate; an active layer grown on a basal plane of the gallium nitride based semiconductor region in such a way as to have an emission peak wavelength of 410 nm or more, wherein the active layer includes a quantum well structure in which well layers and barrier layers are arranged alternately, the thickness of the well layer is 4 nm or more, and 10 nm or less, the well layer is composed of In X Ga 1-X N (0.15≦X<1, where X is a strained composition), the barrier layer is composed of In Y Ga 1-Y N (0≦Y≦0.05, Y<X, where Y is a strained composition), and the basal plane is a semipolar plane inclined at an inclination angle within the range of 15 degrees or more, and 85 degrees or less with reference to a {0001} plane or a {000-1} plane; a p-type gallium nitride based semiconductor region grown on the active layer; and a first electrode disposed on the p-type gallium nitride based semiconductor region, wherein the gallium nitride based semiconductor region grown on the group-III nitride substrate has n-type conductivity, the basal plane of the group-III nitride substrate is inclined at an inclination angle within the range of 15 degrees or more, and 85 degrees or less with reference to the {0001} plane or the {000-1} plane, the gallium nitride based semiconductor region, the active layer, and the p-type gallium nitride based semiconductor region are located on the basal plane of the group-III nitride substrate in that order from the group-III nitride substrate, and the group-III nitride substrate is composed of In S Al T Ga 1-S-T N (0≦S≦1, 0≦T≦1, and 0≦S+T≦1).