绿色长余辉发光材料MgGa2O4:Mn2+ 的制备及性能研究.

The long afterglow green phosphors MgGa2O4:Mn2+（x=0.5%, 1%, 3%, 5%） series were synthesized by high temperature solid-state method in this paper. The long afterglow luminescent properties were investigated using X-ray diffraction （XRD）, scanning electron microscopy （SEM）, luminescent spectrum and thermo luminescent spectrum. The luminescent spectra consisted of the characteristic emission peak of Mn2+ at 509 nm, corresponding to the 4T1（4G） →6A1（6S） electronic transition of Mn2+ ion and the optimal doping concentration was x=3%. The afterglow spectra of the samples were similar to the emission spectra, which were also located at 509 nm and can be ascribed to 4T1（4G） →6A1（6S） electronic transition of Mn2+. At the same time, with the increase of doping concentration, the afterglow intensity first increased and then decreased and the doping concentration of 1% had the best afterglow performance. Furthermore, the green afterglow luminescence of the samples could persist for more than 1 h. And the thermoluminescence spectrum consisted of a wide peak at near 342 K, which was very suit to produce excellent long afterglow. [ABSTRACT FROM AUTHOR]