Patent ID: 7675069

Claim:
An ultraviolet light-emitting device comprising: a AlGaN buffer layer being subjected to a crystal growth at a growth temperature of 1000° C. to 1200° C.; a first InAlGaN emission layer being subjected to crystal growth at a growth temperature of 830° C. to 950° C. in accordance with metalorganic vapor phase epitaxy wherein ammonia, trimethylgallium, trimethylindium adduct and trimethylaluminum are used as material gases, in said vapor phase epitaxy of said first InAlGaN layer, a content of In in the crystal is proportionate to a content of Al, wherein a ratio of composition of In is 6%, a ratio of composition of Al is 16% and a total of ratios of composition in In, Al and Ga is 100%; a second InAlGaN emission layer being subjected to crystal growth at a growth temperature of 830° C. to 950° C. in accordance with metalorganic vapor phase epitaxy wherein ammonia, trimethylgallium, trimethylindium adduct and trimethylaluminum are used as material gases, in said vapor phase epitaxy of said second InAlGaN layer, a content of In in the crystal is proportionate to a content of Al, the ratios of composition of the second InAlGaN layer differ from that of said first InAlGaN layer, wherein a ratio of composition of In is 6%, a ratio of composition of Al is 16% and a total of ratios of composition in In, Al, and Ga is 100%; and a quantum well structure formed by laminating alternately a plurality of layers of said first InAlGaN emission layer, and said second InAlGaN emission layer; so that the ultraviolet light-emitting device using the InAlGaN emits light having a single peak at room temperature with high efficiency in an ultraviolet short-wavelength region of a wavelength of 280 nm to 360 nm.