Green upconversion luminescence from poly-crystalline Yb3+, Er3+ Co-doped CaMoO4

The upconversion (UC) luminescence properties of polycrystalline Er3+/Yb3+ co-doped CaMoO4 synthesized by a complex citrate gel method were investigated in detail. Under 980 nm excitation, Er3+/Yb3+ co-doped CaMoO4 has exhibited a weak red emission near 670 nm and strong green UC emissions at 530 and 550 nm, corresponding to the intra 4f transitions of Er3+ (4F9/2, 2H11/2, 4S3/2) → Er3+ (4I15/2). The optimum doping concentrations of Er3+ and Yb3+ were determined to result in the highest UC luminescence and a possible UC mechanism of Er3+/Yb3+ co-doped CaMoO4 depending on the pump power dependence is discussed in detail.

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► Synthesis and analysis of Er3+/Yb3+ co-doped CaMoO4 upconversion phosphor.
► CaMoO4:Er3+/Yb3+ exhibited strong green UC emission with weak red UC emission.
► Optimum doping concentrations of Er3+/Yb3+ ions have been investigated to 2/16 mol%.