Synthesis and up-conversion luminescence properties of Ho3+-Yb3+co-doped glass ceramics with perovskite structure

By using melt solidification crystallization method, Ho3+-Yb3+ co-doped transparent glass ceramics (GCs) con-taining LaTiO3 microcrystal were successfully prepared. The structure of the GCs was characterized by X-ray diffraction (XRD), which proved that LaTiO3 microcrystal was precipitated in the precursor glass (PG). The structures of PG and GCs were studied by infrared spectrum, which showed that a new absorption peak appeared in the GCs, which was attributed to the stretching vibration of the Ti-O bond in the [TiO6] octahedral group, and it further demonstrated the precipitation of the LaTiO3 microcrystal. By studying the up-conversion luminescence (UCL) properties, it is found that there were three emission peaks at 546, 652 and 484 nm, which are attributed to the 5F4/5S2 -> 5I8, 5F5 -> 5I8 and 5F3 -> 5I8 transitions of Ho3+, respectively, and the optimal doping con-centrations of Ho3+ and Yb3+ were determined. The chrominance coordinate of Ho3+-Yb3+ co-doped glass ceramic (GC) is situated in the green light area and the color purity is as high as 98.03 %. The researches above show that Ho3+-Yb3+ co-doped GCs with LaTiO3 microcrystal have a wide application prospect in green luminescence.