| 光谱学与光谱分析 |
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| The Synthesis, Luminescence and Energy Transmission of NaLa(MoO4)2∶Eu3+/Tb3+/Tm3+ Materials |
| XU Jing1, YAN Jing-hui1, HAN Yu-ting1, QIAO Shu-liang3, YANG Bo1, LI Li2, LIU Cai-hong2, YAO Shuang1*, ZOU Ming-qiang2* |
| 1. School of Chemical and Environmental Engineering, Changchun University of Science and Technology，Changchun 130022, China2. Chinese Academy of Inspection and Quarantine, Beijing 100123, China3. Baotou Entry-Exit Inspection and Quarantine Bureau，Baotou 014010, China |
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Abstract A series of Eu3+/Tb3+/Tm3+ single/co-doped NaLa(MoO4)2 (NLM) phosphors have been synthesized by microemulsion-hydrothermal method. Phosphor crystal structure, morphology and luminescent properties were tested and studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectroscopy. The results show that the prepared samples are all tetragonal single crystals. By way of substitution, the sites of La3+ are replaced by Eu3+, Tb3+and Tm3+. Morphology of the samples are tetragonal sheet structure and the size of particles is 1~1.5 μm. When the doping concentration of Eu3+ is 9%, NLM∶9%Eu3+ phosphor emission peak is the strongest at 616 nm, the critical transfer distance (Rc) between Eu3+ in the NLM matrix is about 15.20 at this time. At the emission spectrum of NLM∶9%Eu3+, the peak at 591 nm is the magnetic dipole transition of 5D0 to 7F1 of Eu3+. The peak at 616 nm is the electric dipole transition of 5D0 to 7F2 of Eu3+. Electric dipole transition emission intensity is about 10 times of the strength of the magnetic dipole transition. This indicates that Eu3+ is located at noninversion symmetry site. By Fixing Eu3+ (Tb3+) concentration and varying the concentration of Tb3+ (Eu3+), the energy transfer mechanism between Eu3+ and Tb3+ was studied. By adjusting the Eu3+, Tb3+and Tm3+ doping concentrations, tunable luminescence of visible light region is implemented under the single matrix. The luminescence of NLM∶x%Eu3+, y%Tb3+, z%Tm3+ phosphors are translated from blue (0.205, 0.135) to pseudo-white (0.305, 0.266) under 360 nm irradiation.
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Received: 2014-09-03
Accepted: 2014-12-25
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Corresponding Authors:
YAO Shuang, ZOU Ming-qiang
E-mail: yaoshuang@cust.edu.cn;mingqiangz@sina.com
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