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In this study, a series of Eu 3+ doped CaWO 4 phosphors were synthesized by the solid-state reaction method. Red long afterglow was observed after samples were excited with 254 nm. The main emission peaks were ascribed to the 5 D 0 -7 F J (J = 0, 1, 2, 3, 4) transitions of Eu 3+ , and the duration of the optimal sample could last nearly 40 min in the dark seen with naked eyes. The effect of the doping concentration of Eu 3+ and alkali metal charge compensators (Li, Na, K) on the luminescent properties of the products were investigated in detail. The proposed mechanism of this afterglow property is also discussed.

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