Influence of Bi3+ Doping on Properties of CaMoO4：Eu3+ Phosphors
ZHANG Qing-xia1, LONG Dan-dan1, ZHANG Fan2, QI Xiao-hua2, ZHANG Heng1, YAN Jing-hui1*, ZOU Ming-qiang2*
1. School of Chemical and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China 2. Chinese Academy of Inspection and Quarantine, Beijing 100123, China
Abstract：Europium doped CaMoO4 and bismuth co-doped CaMoO4：Eu3+ phosphors were prepared via microemulsion-hydrothermal method. The structure, morphology and luminescence properties of samples were investigated by X-ray diffraction(XRD), scanning electron microscopy(SEM) and fluorescence spectroscopy, respectively. The XRD patterns of as-prepared samples were in agreement with the PDF # 29-0351 of CaMoO4, which indicated that the phosphor possessed tetragonal crystal structure. SEM images showed that the samples were basically flake in shape and their average size was 1.5~2.5 μm. The critical molar concentration of activator (Eu3+) in CaMoO4：Eu3+ was 5%, and the predominant peak of CaMoO4：Eu3+ located at 616 nm, corresponding to the 5D0→7F2 electronic dipole transition of Eu3+. The photoluminescence color can be tuned from orange-yellow (0.514, 0.537) to white (0.339, 0.333) by adjusting the doping concentrations of Eu3+ ions. To enhance the red emission intensity of Eu3+, Bi3+ was used to co-dope CaMoO4：Eu3+ as sensitizers. When the concentration of Bi3+ is 3%, luminescence intensity was maximum. The chromaticity coordinates (CIE) varied from orange (0.497, 0.347) to red (0.585, 0.349) with increasing the content of Bi3+.
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