Effect of detrapping on up-conversion charging in LaMgGa₁₁O₁₉:Pr³⁺ persistent phosphor

Up-conversion charging (UCC) is a promising approach for charging storage phosphors using low-energy excitation light sources. For further understanding the UCC, research on the competition between trapping and detrapping during illumination is essentially required. Here we demonstrate the effect of detrapping on UCC dynamics by a rate equation approach. Accordingly, taking LaMgGa₁₁O₁₉:Pr³⁺ phosphor as an example, we experimentally verified the dependence of illumination dose and duration on the thermoluminescence intensities using 450 nm laser excitation. The present model and experimental approach appear to be transferable to other phosphors. Thus, many existing persistent phosphors can now be revisited, paving the way toward advancing the understanding of UCC.