Ba2+-driven site-selective substitution of Mn2+ ions and persistent luminescence of Sr1-xBaxGa2Si2O8:Mn2+ phosphors

A series of novel yellow persistent luminescence Sr1-xBaxGa2Si2O8:Mn2+ phosphors were synthesized by the solid state method. To investigate the site-selective occupation of Mn2+ in Sr1-xBaxGa2Si2O8, the XRD, emission, and persistent luminescence (PersL) spectra were performed in detail for samples with different Ba2+ concentrations. With increasing Ba2+ concentrations, the Mn2+ showed an occupation preference on the decahedral sites. Furthermore, thermo-luminescence (TL) indicated a broad trap distribution ranging from 0.61 eV to 1.01 eV which endowed SrGa2Si2O8:Mn2+ a bright persistent luminescence at room temperature. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

The study revealed that with increasing Ba2+ concentrations, Mn2+ tended to preferentially occupy the decahedral sites, and SrGa2Si2O8:Mn2+ exhibited bright persistent luminescence at room temperature due to a wide trap distribution.