Mn 2 + activated red phosphorescence in BaMg2Si2O7: Mn2+, Eu2+, Dy3+ through persistent energy transfer

Based on persistent energy transfer, Mn2+ activated red phosphorescence is achieved in BaMg2Si2O7. Two types of Mn2+ centers with emitting peaks at 620 and 675nm, respectively, are observed and found to govern both the red luminescence and red phosphorescence spectral shapes. The spectral distribution of the red phosphorescence as a function of irradiation wavelengths and Mn2+ concentrations is systematically studied in Mn2+ and Dy3+ doubly doped and Mn2+, Eu2+, and Dy3+ tridoped samples, indicating the dominant role of persistent energy transfer on generation of the red phosphorescence. Moreover, it is found that the incorporation of Mn2+ in BaMg2Si2O7: Eu2+, Dy3+ may prolong the phosphorescent persistence time (>1h) compared with the Mn2+ free materials.