Preparation of glass-based composites with green upconversion and persistent luminescence using modified direct doping method

New oxyfluorophosphate glass-based composites which exhibit not only green upconversion under 980 nm pumping but also persistent luminescence (PeL) after being UV charged were successfully prepared using the direct doping method. The are composed of a glass-ceramic with Er 3+ doped CaF 2 crystals and luminescent particles SrAl O 4 :Eu,Dy composition. In standard method, glass melt is quenched few minutes adding PeL in held at temperature lower than melting temperature. It demonstrated that method should be modified when preparing oxyfluoride glasses to limit decomposition fluorine evaporation occurring during preparation. Here, by quenching right particles. allows preparation strong homogeneous luminescence. • process. Adding doesn't impact Er:CaF crystal precipitation. Direct process needs fluorine. new composite exhibits