Synthesis, Structure, and Tunable Luminescence Properties of Novel Ba3NaLa(PO4)3F:Eu2+,Mn2+Phosphors

A series of luminescent emission-tunable phosphors Ba3NaLa(PO4)3F:Eu2+,Mn2+ have been prepared by a high-temperature solid-state reaction. The Rietveld refinement analysis confirms that the obtained phosphors possess pure apatite crystalline phase and the sites' occupancy of dopant has been also discussed. Upon the excitation of 355nm, the emission spectra of Ba3NaLa(PO4)3F:Eu2+,Mn2+ consist of two broad bands assigned to 5d-4f transition of Eu2+ and 4T1 (4G)-6A1 (6S) transitions of Mn2+, respectively. Energy transfer (ET) occurs in Eu2+, Mn2+ codoped Ba3NaLa(PO4)3F host. On the basis of the thorough analysis and comparison upon their excitation, emission properties, and the decay behaviors, it is demonstrated that the ET mechanism between Eu2+ and Mn2+ is ascribed to the exchange interaction, and the tunable emission color in the novel apatite host can be realized.