Highly luminescent Gd2O2S:Er3+,Yb3+ upconversion microcrystals obtained by a time- and energy-saving microwave-assisted solid-state synthesis - Machado, Ian Pompermayer; Wit, Jur de; Bunningen, Arnoldus J. van; Pedroso, Cássio Cardoso Santos; Rodrigues, Lucas Carvalho Veloso; Brito, Hermi Felinto de; Meijerink, Andries (Journal of Alloys and Compounds, 2023)