Abstract
Li+/Tm3+/Yb3+ co-doped CaMoO4 upconversion (UC) phosphor was prepared by complex citrate-gel method and UC luminescence properties were investigated. Li+/Tm3+/Yb3+ co-doped CaMoO4 has intense blue emission induced by 1G4→3H6 transition at 476 nm that is improved 10 times more than that of Li+ undoped sample and weak red emission at 647 nm generated by 3F2→3H6 transition under excitation at 980 nm. The optimum doping concentration of Li+ ions was investigated and UC mechanism of Li+/Tm3+/Yb3+ co-doped CaMoO4 was discussed in detail.
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