Abstract
Polycrystalline Tm3+/Yb3+ co-doped CaMoO4 UC phosphors were successfully synthesized by a complex citrate-gel method and their upconversion (UC) luminescence was investigated. Under excitation at 980nm, Tm3+/Yb3+ co-doped CaMoO4 showed bright blue emission near 475nm generated by the 1G4→3H6 transition and strong NIR UC emission around 796nm generated by the 3H4→3H6 transition, with weak red emission near 650nm due to the 3F2→3H6 transition. The optimum doping concentrations of Tm3+ and Yb3+ for the highest UC luminescence were investigated, and the related UC mechanism of Tm3+/Yb3+ co-doped CaMoO4 depending on pump power was studied in detail.
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