Insight into Eu redox and Pr3+ 5d emission in KSrPO4 by VRBE scheme construction
Rongfu Zhou (Sun Yat-sen University)
Litian Lin (Sun Yat-sen University)
Chunmeng Liu (Sun Yat-sen University)
P. Dorenbos (TU Delft - RST/Fundamental Aspects of Materials and Energy)
Ye Tao (Institute of High Energy Physics Chinese Academy of Science)
Yan Huang (Institute of High Energy Physics Chinese Academy of Science)
Hongbin Liang (Sun Yat-sen University)
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Abstract
A series of Ln-doped KSrPO4 (Ln = Ce3+, Eu3+, Eu2+, Pr3+) phosphors are prepared through a high-temperature solid-state method. The KSrPO4 compound is confirmed to possess a β-K2SO4 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. Ce3+ and Eu3+ 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 KSrPO4: Ce3+/Eu2+ exhibit an excellent thermal stability of Ce3+/Eu2+ luminescence. Based on the VUV-UV-vis spectra of Ce3+ and Eu3+ doped KSrPO4, the vacuum referred binding energy (VRBE) scheme is constructed to understand the redox properties of Eu, the 5d energy levels of Pr3+ and the thermal quenching characteristics of Ce3+ and Eu2+ luminescence.