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A series of Ln-doped KSrPO 4 (Ln = Ce 3+ , Eu 3+ , Eu 2+ , Pr 3+ ) phosphors are prepared through a high-temperature solid-state method. The KSrPO 4 compound is confirmed to possess a β-K 2 SO 4 structure with the Pnma group by Rietveld refinement, and the temperature-dependent lattice parameters are investigated with the powder X-ray diffraction results at different temperatures. Ce 3+ and Eu 3+ ions are introduced to probe the crystal field strength (CFS) and the lanthanide site symmetry by using VUV-UV-vis spectroscopy. The temperature-dependent luminescence properties of KSrPO 4 : Ce 3+ /Eu 2+ exhibit an excellent thermal stability of Ce 3+ /Eu 2+ luminescence. Based on the VUV-UV-vis spectra of Ce 3+ and Eu 3+ doped KSrPO 4 , the vacuum referred binding energy (VRBE) scheme is constructed to understand the redox properties of Eu, the 5d energy levels of Pr 3+ and the thermal quenching characteristics of Ce 3+ and Eu 2+ luminescence.

Insight into Eu redox and Pr3+ 5d emission in KSrPO4 by VRBE scheme construction

Insight into Eu redox and Pr³⁺ 5d emission in KSrPO₄ by VRBE scheme construction