Patent ID: 8071986

Claim:
A nitride semiconductor light-emitting element for generating light containing a wavelength component in an ultraviolet region, comprising: an active region comprising an In X1 Al Y1 Ga 1-X1-Y1 N well layer (1>X1>0 and 1>Y1>0) and an In X2 Al Y2 Ga 1-X2-Y2 N barrier layer (1>X2>0 and 1>Y2>0), wherein an energy gap difference between the In X1 Al Y1 Ga 1-X1-Y1 N well layer and the In X2 Al Y2 Ga 1-X2-Y2 N barrier layer is not less than 2.4Ã—10 âˆ’20 J nor more than 4.8Ã—10 âˆ’20 J, an In composition X1 of the In X1 Al Y1 Ga 1-X1-Y1 N well layer is more than 0 and less than or equal to 0.02, an In composition X2 of the In X2 Al Y2 Ga 1-X2-Y2 N barrier layer is more than 0 and less than or equal to 0.02, and the active region has a quantum well structure configured to generate light of a wavelength in a wavelength region of not less than 300 nm nor more than 365 nm.