Luminescence Properties of High Density Phosphor γ-Bi_2WO_6:Pr~(3+)

The structure, excitation and emission spectra of photoluminescence of γ-Bi2WO6:Pr3+ prepared by solid state reaction were studied, the diffusion reflection spectrum of γ－Bi2WO6 was recorded. The density Dx=9.53 g/cm3 and crystal parameters α=5.45A, b=16.42A, and c=5.43Aof γ-Bi2WO6:Pr3+ were measured. The main peaks of its photoluminescence spectrum are 600, 608 and 611, 629nm, which are from 1D2→3H4, 3Po →H6, 3Po→3H6 and 3Po→3F2 transitions of Pr3+, respectively The excitation spectrum of γ-Bi2WO6:Pr3+ consists of the main excitation band with maximum 372nm and 450nm peak. The diffusion reflection spectrum indicates that there has strong absorption in the range of 225-430nm, at the same time, the main excitation bands of excitation spectra of γ－Bi2WO6:Pr3+ and γ-Bi2WO6 are similar, which indicates that the main excitation band of γ-Bi2WO6:Pr3+ is from the host possibly due to the transition absorption of band-to-band, charge transfer transition of W-O and defect level transitions. The 450nm peak is from characteristic absorption 3H4→3P2 of Pr3+. The favorite dosage of Pr3+ in BWO:Pr3+ is about 0.8mol%.