Luminescence and energy transfer in Eu2+, Mn2+ co-doped Ca2SrNaLa(PO4)3F

Abstract A new compound Ca 2 SrNaLa(PO 4 ) 3 F, isotypic with hexagonal Ca(Sr,Na,Ca)(Ca,Sr,Ce) 3 (PO 4 ) 3 F, is reported. Its cell parameters have been determined from X-ray powder diffraction data. Crystallization occurs in the hexagonal space group P 6 3 (No. 173) with a = 9.515(1) A, c = 7.028(1) A, and Z = 2. Eu 2+ and Mn 2+ activated Ca 2 SrNaLa(PO 4 ) 3 F phosphors have been prepared. The energy transfer of Eu 2+ → Mn 2+ has been investigated. The resonant type energy transfer from Eu 2+ to Mn 2+ has been demonstrated, and the energy transfer efficiency has also been calculated according to their PL decay curves. A color-tunable emission in Ca 2 SrNaLa(PO 4 ) 3 F phosphors can be realized by Eu 2+ → Mn 2+ energy transfer. White light can be achieved in a single-phased Ca 2 SrNaLa(PO 4 ) 3 F host by co-doping Eu 2+ and Mn 2+ with CIE (0.32, 0.31). Our results demonstrate that the potential application of these phosphors in solid-state lighting and (or) other areas.