Influences of Er3+ content on structure and upconversion emission of oxyfluoride glass ceramics containing CaF2 nanocrystals |
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| Affiliation: | 1. Ogarev Mordovia State University, Bol’shevitskaya street, 68, Saransk, Russia;2. Kazan Federal University, Kremlevskaja street, 18, Kazan, Russia;3. General Physics Institute of Russian Academy of Sciences, Vavilova street, 38, Moscow, Russia;1. College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, PR China;2. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, PR China;1. State Key Laboratory of Materials-Orient Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China;2. State Key Lab of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China;3. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China;4. Department of Chemistry and Bioscience, Aalborg University, DK-9220 Aalborg, Denmark;1. College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, China;2. College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian 350117, China;3. Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen, Fujian, 361005, China |
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| Abstract: | Transparent 45SiO2–25Al2O3–5CaO–10NaF–15CaF2 glass ceramics doped with different content of erbium ion (Er3+) were prepared. X-ray diffraction (XRD) and transmission electron microscope (TEM) analyses evidenced the spherical CaF2 nanocrystals homogeneously embedded among the glassy matrix. With increasing of Er3+ content, the size of CaF2 nanocrystals decreased while the number density increased. The crystallization kinetics studies revealed that CaF2 crystallization was a diffusion-controlled growth process from small dimensions with decreasing nucleation rate. Er3+ could act as nucleating agent to lower down crystallization temperature, while some of them may stay at the crystal surfaces to retard the growth of crystal. Intense red and weak green upconversion emissions were recorded for glass ceramics and their intensities increased with the increasing of Er3+ content under 980 nm excitation. However, the concentration quenching effect appeared when Er3+ doping reached 2 mol%. These results could be attributed to the change of ligand field of Er3+ ions due to the incorporation of Er3+ ions into precipitated fluoride nanocrystals. |
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