Sustainable solid-state method of synthesis, characterisation, and photoluminescence studies of Yb3+/Ho3+ doped YPO4 nanomaterialsSirisha Bandi, Phani Raja Kanuparthy, Venkata Nagendra Kumar Putta, Kusuma Ashok Kumar and Saroja Rani BhupatirajuE3S Web Conf., 552 (2024) 01012DOI: https://doi.org/10.1051/e3sconf/202455201012