Synthesis and Luminescent Properties of a Novel White Phosphor BiOF:Tm³⁺,Dy³

Using BiOF as the main component of the phosphor, a series of BiOF phosphors doped with Tm³⁺ and co-doped with Dy³⁺ were synthesized by the high-temperature solid-state method. The phase structure and luminescence properties of phosphors were analyzed by XRD diffraction, fluorescence spectroscopy and ultraviolet near-infrared spectroscopy analysis system. The structure of the synthesized phosphor crystal is PbFCl, the symmetry is D_4h, the space group is P4/nmm, and it belongs to the tetragonal crystal system. BiOF:Tm³⁺ phosphor exhibits blue light emission, and the luminescent color of the phosphor can be changed to white light by co-doping Dy³⁺ ions. When the Dy³⁺ doping amount is 0.07, the color coordinates of Bi_0.90OF:0.03Tm³⁺, 0.07Dy³⁺ phosphor are (0.3180, 0.3128), which is closest to the ideal coordinates of white light (0.33, 0.33). The study on the luminescence mechanism and fluorescence lifetime of Bi_0.90OF:0.03Tm³⁺, 0.07Dy³⁺ shows that there is energy transfer between Tm³⁺ and Dy³⁺.The dipole-dipole interaction contributed to energy transfer from Tm³⁺ to Dy³⁺ ions. The results indicate that BiOF:Tm³⁺, Dy³⁺ phosphors are promising candidates for near-ultraviolet white LED emitting phosphors.