Effects of dopant concentrations on phosphorescence properties of Eu/Dy-doped Sr_3MgSi_2O_8

摘要

Long afterglow Sr_3MgSi_2O_8: 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 4f~7 → 4f~65d~1 transition of Eu~(2+) in the pigment matrix, which is in good agreement with the calculated value of 470 nm, and implies that luminescent centers Eu~(2+) occupy the deca-coordinated Sr~(2+) sites with the host of Sr_3MgSi_2O_8.