Dy³ /Eu³ co-doped cubic lattice NaYF₄single crystal with high quality in the size of ~Φ1.0 cm×10.0 cm was grown by an improved Bridgman method using potassium fluoride (KF) as assistant flux. X-ray diffraction (XRD), absorption spectra, excitation spectra and emission spectra are measured to investigate the phase and luminescent properties of the crystal. The effects of excitation wavelength and concentrations of Dy³ and EuEu³ ions on the luminescent characteristics are analyzed. The NaYF₄single crystal with the doping molar concentrations of 1.205% Dy³ and 0.366% Eu3 exhibits an excellent white light emission with chromaticity coordinates of x=0.321, y=0.332. It indicates that the Dy³ /Eu³ co-doped cubic lattice NaYF₄single crystal can be a potential luminescent material for the ultraviolet (UV) light excited white light emitting diode (w-LED).