Abstract
A new persistent yellow-emitting phosphor CaGa 2 S 4 :Eu 2+ , Ho 3+ was prepared by a solid-state method. The luminescence properties, including thermoluminescence (TL) glow curve and its spectral decomposition, as well as the long decay time curve, were studied. The results revealed that a new trapping level with a suitable depth was created due to co-doped Ho 3+ , which led to the long afterglow at room temperature. Trapping depths were evaluated by a TL glow curve fitted by a general order kinetics formula. A mechanism for the long-duration phosphorescence from Eu 2+ in CaGa 2 S 4 :Eu 2+ , Ho 3+ was also proposed.
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