Tunable luminescence for KNaCa_2(PO_4)_2:Eu~(2+)/Mn~(2+) phosphors due to energy transfer from Eu~(2+) to Mn~(2+)

摘要

Abstract A series of KNaCa~(2)(PO~(4))~(2):Eu_(2+)/Mn_(2+)phosphors were synthesized by a solid state reaction. The phase and optical properties of the synthesized phosphors were investigated. The XRD results indicate that the doped Eu_(2+)and Mn_(2+)ions do not change the phase of KNaCa~(2)(PO~(4))~(2). The emission intensity of KNaCa~(2)(PO~(4))~(2):Eu_(2+)shows obvious dependence on Eu_(2+)concentration. It was found that the critical concentration for Eu_(2+)in KNaCa~(2)(PO~(4))~(2)is 0.04. The emission intensity of KNaCa~(2)(PO~(4))~(2):Eu_(2+)decreases due to concentration quenching as soon as the Eu_(2+)concentration is higher than the critical concentration. Due to energy transfer from Eu_(2+)to Mn_(2+)in KNaCa~(2)(PO~(4))~(2):Eu_(2+)/Mn_(2+)phosphors, tunable luminescence was obtained by changing the concentration of Mn_(2+).