Abstract
A self-activated emission contributing to the photoluminescence (PL) and long persistent luminescence (LPL) is observed in Ca3Ga4Ge4O14 under the ultra-violet excitation and after the removal of the excitation source, respectively. The energy transfer process from the host matrix to the activators of praseodymium contributes to the green emission originated from the characteristic transition of 3P0→3H4 dominating in the luminescence spectra of Ca3Ga4Ge4O14: Pr3+. The presence of Zn2+ ions not only stabilizes more carriers at shallow traps, improving the LPL behavior at room temperature, but also ameliorates the PL performance for the thermal quenching fundamentally. Hence, a better understanding of the captured carriers on the luminescence performance in the Pr3+ doped self-activated Ca3Ga4Ge4O14 is achieved.
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