Synthesis and up-conversion luminescence properties of Ho 3+ -Yb 3+ co-doped glass ceramics with perovskite structure

By using melt solidification crystallization method, Ho 3+ -Yb 3+ co-doped transparent glass ceramics (GCs) containing LaTiO 3 microcrystal were successfully prepared. The structure of the GCs was characterized by X-ray diffraction (XRD), which proved that LaTiO 3 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 [TiO 6 ] octahedral group, and it further demonstrated the precipitation of the LaTiO 3 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 5 F 4 / 5 S 2 → 5 I 8, 5 F 5 → 5 I 8 and 5 F 3 → 5 I 8 transitions of Ho 3+, respectively, and the optimal doping concentrations of Ho 3+ and Yb 3+ were determined. The chrominance coordinate of Ho 3+ -Yb 3+ 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 Ho 3+ -Yb 3+ co-doped GCs with LaTiO 3 microcrystal have a wide application prospect in green luminescence.