RbBaPO:Eu phosphors have been prepared by a high-temperature solid-state reaction method, and the structure was determined by Rietveld refinement based on powder X-ray diffraction (P-XRD) data. Their VUV-UV-vis photoluminescence properties are systematically investigated with three objectives: (1) based on low-temperature spectra, we clarify the site occupancies of Eu, and demonstrate that the doublet emission bands at ∼406 and ∼431 nm originate from Eu in Ba [Eu(I)] and Rb [Eu(II)] sites, respectively; (2) an electron-vibrational interaction (EVI) analysis is conducted to estimate the Huang-Rhys factors, the zero-phonon lines (ZPLs) and the Stokes shifts of Eu in Rb and Ba sites; (3) the studies on luminescence decay of Eu(I) reveal that dipole-dipole interaction is mainly responsible for the energy transfer from Eu(I) to Eu(II), and the energy migration between Eu(I) is weak. Finally, the X-ray excited luminescence (XEL) spectrum indicates that the light yield of the sample RbBaEuPO is ∼17 700 ph/MeV, showing its potential application in X-ray detecting.
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