The Photoluminescence Properties Of Eu~(3+),bi~(3+) Co-doped Yttrium Oxysulfide Phosphor Under Vacuum Ultraviolet Excitation

摘要

Y_2O_2S co-doped with Bi~(3+),Eu~(3+) phosphors were prepared and their luminescence properties under vacuum ultraviolet (VUV) excitation were investigated. Much stronger red emission for Y_2O_2S:Eu~(3+),Bi~(3+) were observed under 147 nm excitation than that for Y_2O_2S:Eu3~(3+). Investigation on photoluminescence and calculation of electronic structure of Y_2O_2S:Eu~(3+),Bi~(3+) revealed that the Bi~(3+) acts as a medium in energy transfer process and the great VUV luminescence enhancement of Y_2O_2S:Eu~(3+) by doping Bi~(3+) is due to effective energy transfer process: charge transfer (CT) transition of Y~(3+)-O~(2-) → Bi~(3+) → Eu~(3+). The Y_2O_2S:Eu~(3+),Bi~(3+) showed excellent optical properties when compared with the commercial (Y,Gd)BO_3:Eu~(3+). Thus, the Y_2O_2S:Eu~(3+)Bi~(3+) would be a promising VUV-excited red phosphor.