Ba²⁺-driven site-selective substitution of Mn²⁺ ions and persistent luminescence of Sr_1-xBa_xGa₂Si₂O₈: 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