Highly efficient green upconversion luminescence of ZnMoO4:Yb3+/Er3+/Li+ for accurate temperature sensing

Upconversion luminescence and optical temperature sensing properties of Yb 3+ /Er 3+ /Li + tri-doped ZnMoO 4 phosphors were investigated. It has been demonstrated that Li + doping affected not only the local symmetry of Yb 3+ and Er 3+ but also the distribution of them in the host lattice. As a result, the significantly improved green upconversion luminescence was obtained when excited at 980 nm. The pumping power dependent photo-thermal behavior was used to evaluate the reliability of upconversion temperature sensing. An accurate temperature scale was established by eliminating the impact of thermal effect, and the sensing ability was evaluated via a comparison with the results reported in literatures.