Abstract
Er3+doped CaMoO4(CaMoO4:Er3+) and Er3+/Yb3+co-doped CaMoO4(CaMoO4:Er3+/Yb3+) particles was successfully synthesized by a cyclic microwave-assisted metathetic (MAM) method, followed by heat-treatment. Well-crystallized UC CaMoO4:Er3+/Yb3+particles formed after heat-treatment at 600°C for 3 h showed a fine and homogeneous morphology with particle sizes of 1-3 μm. At excitation at 980 nm, CaMoO4:Er3+/Yb3+particles exhibited a strong 525-nm emission band and a weak 550-nm emission band in the green region, and a weak 655-nm emission band in the red region. The UC intensities of CaMoO4:Er3+/Yb3+particles were much higher than that of the CaMoO4:Er3+particles. The Raman spectra of CaMoO4:Er3+and CaMoO4:Er3+/Yb3+particles indicated the appearance of additional strong peaks in comparision with that of pure CaMoO4.
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