Abstract
Strong and long-lasting photostimulated luminescence (PSL) is observed and studied in Eu2+ and Tm3+ codoped Sr3Al2O5Cl2 under 980nm continuous stimulation after UV and blue light pre-irradiation. Compared to the Eu2+ singly doped one, the PSL intensity and energy storage capacity in the doubly doped material are enhanced by a factor of 400 and 91, respectively. The study indicates that codoping Tm3+ leads to a large increase of traps that enlarge energy storage capacity as three times as the commercial phosphor SrS:Eu2+, Sm3+.
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