Crystal structure, photoluminescence properties and energy transfer of Ce3+, Mn2+ co-activated Ca8NaGd(PO4)6F2 phosphor

Abstract Ca (8− y ) Mn y NaGd (1− x ) Ce x (PO 4 ) 6 F 2 (CNGF: x Ce 3+ , y Mn 2+ ) (0 ≤ x ≤ 0.05, 0 ≤ y ≤ 0.16) phosphors were synthesized by solid state reaction. The crystal structure was determined to be apatite-type by XRD refinement. The PLE and PL spectra showed that the energy transfer occurs between Gd 3+ to Mn 2+ and Ce 3+ to Mn 2+ . And the energy transfer efficiency from Gd 3+ to Mn 2+ and Ce 3+ to Mn 2+ in CNGF had been analyzed. The research result revealed that the electric dipole–quadrupole interaction predominates in energy transfer mechanism from Ce 3+ to Mn 2+ in CNGF. The corresponding CIE coordinates revealed that CNGF: 0.02Ce 3+ , y Mn 2+ could be a good yellow phosphor.