Study on Luminescence Properties of High-Density Phosphors BiTaO_4:Pr~(3+) and BiTaO_4

摘要

The photoluminescence properties of BiTaO_4:Pr~(3+) and BiTaO_4 at room temperature were studied, and the infrared transmission and diffusion reflection spectra of BiTaO_4 were measured. The photoluminescence spectrum of BiTaO_4 peaks at about 420, 440 and 465 nm. There has an obvious excitation band from 330 to 370 nm. The photoluminescence spectrum of BiTaO_4:Pr~(3+) consists of the characteristic emission of Pr~(3+), and its main peak is at 606 nm from ~3P_0→~3H_6 transition of Pr~(3+). Its excitation spectrum consists of the wide band with maximum at 325 nm, the wide band in the range of 375 ～ 430 nm, and the characteristic excitation of Pr~(3+). The bands at 325 nm and 375 ～ 430 nm may be from the absorption of the charge transfer transition of the tantalate group and defect energy levels in its forbidden band, respectively; There is energy transfer from host to Pr~(3+). Because both the host density and photoluminescence peak intensity of BiTaO_4:Pr~(3+) are superior to PbWO_4, BiTaO_4:Pr~(3+) may be a potential heavy scintillator.