首页|Enhanced orange persistence in Sr3Al2O5Cl2:Eu2+, Dy3+ phosphor by Mg2+ substitution in Sr2+lattice site
Enhanced orange persistence in Sr3Al2O5Cl2:Eu2+, Dy3+ phosphor by Mg2+ substitution in Sr2+lattice site
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NSTL
Elsevier
? 2022 Elsevier B.V.The initial intensity and afterglow duration of existing long-wavelength persistent phosphors are insufficient for practical applications. Herein, the afterglow of orange-emitting Sr3Al2O5Cl2:Eu2+, Dy3+ phosphors are enhanced by co-doping with Mg2+ using the conventional solid-state reaction. Rietveld refinement for the prepared phosphor revealed that all Eu2+ cations were placed on the Sr2+ sites, whereas Dy3+ occupancy in the lattice was improved by incorporating Mg2+. All phosphor samples with different Mg2+ concentrations emit 609-nm-centred orange luminescence caused by the 5d→4f transition of Eu2+. The photoluminescence was significantly enhanced with the increase in the Mg2+ doping due to the increased amount of divalent Eu2+ in the samples, as confirmed by the X-ray photoelectron spectroscopy investigation. Incorporating Mg2+ also enhanced the afterglow performance by creating suitable electron traps in the phosphor. The afterglow profiles were simulated by a double exponential decay model, and the results revealed that significant improvement in the afterglow lifetime was achieved for the 0.3 Mg2+-doped phosphors. Also, Mg2+ introduction resulted in a deeper trap level (～0.72 eV) and an increased trap concentration. Consequently, the Mg2+-doped exhibits brighter initial photoluminescence and longer afterglow.
NSTL
Elsevier
