Abstract
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.
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