| 光谱学与光谱分析 |
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| 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 |
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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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Received: 2012-12-06
Accepted: 2013-03-18
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Corresponding Authors:
YAN Jing-hui, ZOU Ming-qiang
E-mail: yanjinghui8888@yahoo.com.cn;mingqiangz@sina.com
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