Energy Transfer in LiSrPO4 Doped with Pr3+ and Co-Doped with Dy3+, Sm3+

Abstract

The study deals with the investigation of luminescence properties and energy transfer processes in LiSrPO₄ doped with Pr3+ and co-doped with Dy3+ or Sm3+. Ultraviolet (UV) and vacuum ultraviolet (VUV) excited emission and excitation spectra are studied, as well as pulsed cathodoluminescence spectra in wide temperature range 5–295 K. In both compounds, Pr3+ plays a role of a sensitizer of co-dopant ion emission in visible range via energy transfer processes. Studies of the photoluminescence excitation spectra show rather complex energy transfer mechanisms and defect emission influence on the emission spectra. The use of Pr3+ in pair with D_y3+, Sm3+ and other ions may enhance the luminescence properties of a compound via increased absorption in UV range, enhancing its suitability to be used as possible white light emitting diodes (W-LEDs) phosphors.