Luminescence and energy transfer of Eu2+, Mn2+ in BaZnP2O7

The BaZnP(2)o(7) : Eu2+ , Mn2+ phosphor was synthesized by high temperature solid state reaction. The luminescence properties and the energy transfer between Eu2+ and Mn2+ were investigated. The emission bands of Eu 2+ and Mn 2+ peaking at 380 nor and 670 nor were originated from 5d-4f transition of Eu2+ which partly substituted the Ba2+ sites and T-4(1) ((4)G)-(6)A(1) (S-6) transition of Mn2+ occupying Zn2+ sites, respectively. The dependence of Eu2+ and Mn2+ luminescence properties on their concentration was investigated. With the increasing Mn2+ dopant content, the intensity of Eu2+ was observed to decrease, but the intensity of Mn2+ was simultaneously found to increase. It is suggested from this phenomenon that Mn2+ ion is sensitized by Eu2+ ion, in other words, there is an energy transfer from Eu2+ to Mn2+ in BaZnP2O7 host. According to the Dexter's energy transfer formula of multipolar interaction, we have demonstrated that the energy transfer between Eu2+ and Mn2+ is due to the electric dipole-quadripole interaction of the resonance transfer.