Abstract
Yellow upconversion (UC) luminescence is observed in Ho3+/Yb3+ co-doped CaMoO4 synthesized by complex citrate-gel method. Under 980nm excitation, Ho3+/Yb3+ co-doped CaMoO4 exhibited yellow emission based on green emission near 543nm generated by 4F4, 5S2→5I8 transition and strong red emission around 656nm generated by 5F5→5I8 transition, which are assigned to the intra 4f transitions of Ho3+ ions. The optimum doping concentration of Ho3+ and Yb3+ was investigated for highest upconversion luminescence. Based on pump power dependence, upconversion mechanism of Ho3+/Yb3+ co-doped CaMoO4 was studied in detail.
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