Abstract
In this work, a long persistent luminescent (LPL) material Sr3Ga4O9:Tb3+ is synthesized via a high-temperature solid-state reaction. The crystal structure, luminescence properties, decay curves and thermoluminescence (TL) curves of Sr3Ga4O9:Tb3+ are studied in detail. When the ultraviolet (UV) light source was turned off, Sr3Ga4O9:Tb3+ phosphor exhibit typical LPL behavior for approximately 7.5 h. The obtained results indicated that the green long persistent emitting was similar to the photoluminescence (PL), originated form the typical 5D4→7F5 transition of Tb3+ ions. We propose the persistent luminescence mechanism of Tb3+ doped Sr3Ga4O9. Electrons in the conduction band and holes in the valence band form stable excitons, and it can play an important role in energy transfer. Based on the specific characteristics of the phosphor, a dual-mode luminescence image is fabricated for application in anti-counterfeiting.
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