Heat-treatment-induced luminescence degradation in Tb-doped CePO4 nanorods |
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Authors: | Weihua Di Xiaoxia Zhao Zhaogang Nie Xiaojun Wang Shaozhe Lu Haifeng Zhao Xinguang Ren |
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Institution: | Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academic of Sciences, 16 Eastern Nanhu Road, Changhcun 130033, PR China |
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Abstract: | CePO4:Tb nanorods were synthesized via a simple wet-chemical route. The as-synthesized CePO4:Tb nanorods present high photoluminescence efficiency due to an efficient energy transfer form Ce3+ to Tb3+. However, heat treatment at 150 °C in air leads to a significant decrease of photoluminescence. X-ray photoelectron spectroscopy and excitation spectra revealed the oxidation of Ce3+ to Ce4+ in the heat-treatment process, which should be responsible for significant photoluminescence degradation due to the breakage of Ce3+→Tb3+ energy transfer. This conclusion is further supported by atmosphere and size effects of photoluminescence of CePO4:Tb under the heat treatment. |
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Keywords: | Ce3+ Tb3+ Ce4+ Photoluminescence Thermal degradation |
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