Lithium lutetium fluoride (LiLuF₄) single crystals doped with different Dy³ ion concentrations were grown by Bridgman method. The Judd-Ofelt (J-O) strength parameters (Ω2, Ω4, Ω6) of Dy³ in LiLuF₄crystal are calculated according to the measured absorption spectra and the J-O theory, by which the asymmetry of the Dy³ :LiLuF₄single crystal and the possibility of attaining stimulated emission from ⁴F_9/2level are analyzed. The capability of the Dy³ :LiLuF₄crystal in generating white light by simultaneous blue and yellow emissions under excitation with ultraviolet light is produced. The effects of excitation wavelength and doping concentration on chromaticity coordinates and photoluminescence intensity are also investigated. Favorable CIE coordinates, x=0.319 3 and y=0.349 3, can be obtained for Dy³ ion in 2.701% molar doping concentration under excitation of 350 nm.