Tunable luminescence and energy transfer properties of LiSrPO4: Ce3+, Tb3+, Mn2+ phosphors

A series of single-composition phosphors LiSrPO4: Ce3+, Tb3+, Mn2+ have been prepared via a high-temperature solid-state reaction process. X-ray diffraction (XRD), scanning electric microscopy (SEM), photoluminescence (PL) spectra, and lifetimes were utilized to characterize the samples. The luminescence properties of Ce3+ in LiSrPO4 have been discussed. The energy transfer process from Ce3+ to Tb3+/Mn2+ has been demonstrated to be a resonant type via the dipoleedipole/quadrupole-quadrupole interaction mechanism, respectively. The emissive colors of LiSrPO4: Ce3+, Tb3+, Mn2+ samples can be adjusted from blue to green and from blue to red-orange by the energy transfer of Ce3+, Tb3+ and Ce3+, Mn2+, respectively. More importantly, white emission has been obtained through adjusting the relative concentrations of Ce3+, Tb3+ and Mn2+ ions in the LiSrPO4 host under UV. It is suggested the present phosphors can be potentially applied as a candidate of single-component white-light phosphor for UV-pumped w-LED. (C) 2016 Elsevier B.V. All rights reserved.