Effect of RE~(3+) as a co-dopant in long-lasting phosphorescence CdSiO_3:Mn~(2+) (RE = Y, La, Gd, Lu)

摘要

Effect of RE~(3+) as a co-dopant in long-lasting phosphorescence CdSiO_3:Mn~(2+) (RE = Y, La, Gd, Lu) has been investigated. A longer orange emitting phosphorescence phenomenon was observed in the co-doped CdSiO_3:Mn~(2+), RE~(3+) phosphors after exciting with ultraviolet (UV) light. The luminescence properties, including photoluminescence (PL) spectra and thermoluminescence (TL) spectra, as well as the afterglow decay curves, were studied. The results revealed that one of the origins of the improvement is due to nonequivalent substitution to produce more e-traps, and energy transfer from Gd~(3+) to Mn~(2+) to boost the performance of CdSiO_3:Mn~(2+), Gd~(3+). Role of RE~(3+) co-doped into CdSiO_3:Mn~(2+) matrix and the possible long-lasting phosphorescence process are discussed in this paper.