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Simultaneous enhancement of emission and thermal sensitivity via phase transition in Gd2(MoO4)3:Yb3+/Er3+ crystals |
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| Authors: | Dongyu Li Weijiang Xu Zhen Huang Xiao Jin Bing Xu Zhenghe Zhang Tingting Zhang Deng Wang Xuping Liu Hao Suo Qinghua Li |
| Affiliation: | 1. Guangdong Provincial Key Laboratory of Development and Education for Special Needs Children, Zhanjiang, China;2. Department of Physics, Harbin Institute of Technology, Harbin, China;3. Guangdong Provincial Key Laboratory of Development and Education for Special Needs Children, Zhanjiang, China Key Laboratory of Environmentally Friendly Functional Materials and Devices, Advanced LED Technology and Utilization Institute, Lingnan Normal University, Zhanjiang, China;4. National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding, China |
| Abstract: | The effects of site symmetric distortion induced by the phase transition on up-conversion emission and thermal sensing performance of Gd2(MoO4)3:Yb3+/Er3+ (GMO) crystals were elaborately studied by minimizing interference from many factors. Monoclinic GMO showed a much stronger fluorescence intensity and larger fluorescence intensity ratio under the irradiation of 980 nm laser in comparison to the orthorhombic counterpart. These remarkable up-conversion properties stemmed from the low site symmetry with large site symmetric distortion in monoclinic GMO. Moreover, the thermal sensing property of the samples was assessed based on the fluorescence intensity ratio technique, where monoclinic GMO exhibited much higher maximum absolute sensitivity (Sa = 0.0257 K−1 at 510 K) due to the site symmetric distortion, which was further explained by the Judd–Ofelt theory and polarizability of the chemical bond volume model. Results opened an efficient avenue for achieving highly sensitive thermometry in many daily scenarios via finely tailoring the local site symmetry. |
| Keywords: | fluorescence intensity ratio Judd–Ofelt theory phase transition thermometry up-conversion |