Improved optical storage properties of NaAlSiO4: Tb3+ induced by Bi3+

NaAlSiO4: Tb3+, Bi3+ phosphor was synthesized with green LPL and PSL observed.The influence of metal ion Bi3+ on the optical storage properties of NaAlSiO4: Tb3+ was investigated in detail, which help us to further understand the mechanism of the energy storing and its subsequent releasing in optical storage materials.Owing to the existence of deep and stable trap TB, green PSL can still be observed after 72 h since the excitation was stopped.All the results indicate that this phosphor has potential applications as an optical storage material.

NaAlSiO4: Tb3+, Bi3+ phosphor was synthesized with green long persistent luminescence (LPL) and photo-stimulated luminescence (PSL) observed. The influence of metal ion Bi3+ on the optical storage properties of NaAlSiO4: Tb3+ was investigated in detail. The emitter Tb3+ introduced two kinds of traps located at 350 K (TA) and 440 K (TB) in the thermoluminescence (TL) glow curve. Bi3+ as a codopant ion introduced a new trap peaking at 390 K (TC), which contributed to the improved LPL properties. Besides, owing to the existence of deep and stable trap TB, green PSL can still be observed after 72 h since the excitation was stopped. Accordingly, the mechanism of LPL and PSL process was discussed briefly.

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