Effects of dopant concentrations on phosphorescence properties of Eu/Dy-doped Sr3MgSi2O8

Long afterglow Sr3MgSi2O8: Eu, Dy phosphor with high brightness was prepared by sintering at high temperature and weak reductive atmosphere. The luminescent properties of this photoluminescent pigment were studied systematically by investigating concentration effects. The analytical results indicated that the main emission peaks appear at 482 nm. The excitation and emission spectra of this phosphor show that both of them are broadband. This is ascribed to the 4f7→4f65d1 transition of Eu2+ in the pigment matrix, which is in good agreement with the calculated value of 470 nm, and implies that luminescent centers Eu2+ occupy the deca-coordinated Sr2+ sites with the host of Sr3MgSi2O8.