Abstract: 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 D_x=9.53 g/cm3 and crystal parameters
a=5.45A, b=16.42A, and c=5.43A of γ-Bi₂WO₆:Pr³⁺ were measured. The main peaks of its photoluminescence spectrum are 600, 608 and 611, 629nm, which are from ¹D₂→³H₄, ³P₀→³H₆, ³P₀→³H₆ and ³P₀→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%.