Synthesis and Luminescent Properties of Violet-Ultraviolet Long Afterglow Phosphors
The M1.99MgSi2O7: Ce3+0.01 (M: Ba, Sr, Ca) phosphors were prepared by the solid-state reaction method. All the samples emit the violet-ultraviolet light with a broad emission band from about 330 nm to 500 nm. All the phosphors samples show a long afterglow. The strongest afterglow intensity and the longest decay duration of the afterglow come from the Ca1.99MgSi2O7: Ce3+0.01 sample. It is attributed to the suitable trap depth and the high trap concentration of this sample. The traps of these phosphors are induced by the lattice defects. A suitable model involving the cation vacancies and the oxygen vacancies, which act as the hole traps and the electron traps respectively, is proposed.
Yuan Ming Huang
H. Y. Wu et al., "Synthesis and Luminescent Properties of Violet-Ultraviolet Long Afterglow Phosphors", Materials Science Forum, Vols. 663-665, pp. 170-176, 2011