Hydrothermal synthesis of Yb3+, Tm3+ co-doped Gd6MoO12 and its upconversion properties*
Di Qiu-Mei, Sun Yu-Mei, Xu Qi-Guang, Han Liu, Xue Bing, Sun Jia-Yue†
       
Schematic energy levels of Yb3+ and Tm3+ ions in the as-prepared Gd6MoO12:Yb3+/Tm3+ sample.