Synthesis and Fluorescence Properties of Rare Earth Ions Co-Doped CaMoO4
WU Wen1, XUAN Ya-wen2, XIAO Li-na1, YANG Zhi-guang1, ZHU Can-can1, XIE Jian-ping1*
1. Department of Chemistry，Zhoukou Normal University，Zhoukou 466000, China 2. School of Mechanical ＆ Electrical Engineering，Zhoukou Normal University，Zhoukou 466000, China
Abstract：In this paper，a series of CaMoO4 phosphor co-doped rare earth ions were prepared with chemistry co-precipitation method．The concentration of Pr3+/Tb3+ and temperature had obvious influence on the luminescent properties. The crystal structures and spectrum characteristics of the samples were identified with X-ray powder diffraction (XRD) and fluorescence spectrophotometer (PL). According to XRD analysis, the main diffraction peaks of samples are consistent with the standard card (JCPDS 29-0351) of the diffraction peak data. This showed doped rare earth ions did not change matrix lattice structure. The emission spectrum excited by 275 nm exhibit sharp lines peaking at 488, 560, 621 and 560 nm assigned to the 3P0—3H4，3P0—3H5，1D2—3H4and3P0—3F2 transitions of the Pr3+ ions. The intensity of fluorescence reached the strongest when the concentration of the doping amount was 3%. The optimum calcination temperatures of CaMoO4∶0.03Pr3+ and CaMoO4∶0.05Tb3+ were 800 and 600 ℃. Furthermore, the intensity of excitation spectra and emission spectra are dependent on the concentration of the doping amount. The emission spectra intensities of CaMoO4∶Pr3+ phosphors decrease and CaMoO4∶Tb3+ phosphors firstly increase and then decrease because of concentration quenching effect with increasing Pr3+ and Tb3+ concentration. In addition，the luminescence properties of Pr3+ ion in CaMoO4∶0.03Pr3+, yTb3+ system could be evidently improved with co-doping of Tb3+ ions which was due to the efficient energy transfer process from Tb3+ to Pr3+ ions.
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