Photoluminescence of Eu2+ and Mn2+ in Sr3MgSi2O8

The fluorescence of Eu2+ and Mn2+ coactivated Sr3MgSi2O8 was studied, The emission bands of Eu2+ and Mn2+ peaking at 460 nm and 690 nm are originated from 5d-->4F transition of Eu2+ and T-4(1)((4)G)-->(6)A(1g)(S-6) transition of Mn2+ respectively. The fluorescence of Mn2+, singly doped in Sr3MgSi2O8 has not been observed, However, codoping with Eu2+ makes photoluminescence of Mn2+ appear at 690 nm, This shows that the emission of Mn2+ is sensitized by Eu2+, and then the fluorescence lifetime of Eu2+ is affected by Mn2+, The experimental results indicate that there exists an effective energy transfer from Eu2+ to Mn2+ in Sr3MgSi2O8 host. This kind of energy transfer is due to the electric dipole-dipole interaction of the resonance transfer.