Towards efficient upconversion and downconversion of NaYF4:Ho3+,Yb3+ phosphors |
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| Authors: | XP Chen WJ Zhang QY Zhang |
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| Institution: | 1. Universidade Federal de Sergipe (UFS), Departamento de Física, 49100-000 São Cristóvão, SE, Brazil;2. Universidade Federal de Sergipe (UFS), Laboratório de Corrosão e Nanotecnologia (LCNT), 49100-000 São Cristóvão, SE, Brazil;3. Grupo de Pesquisa em Física e ensino de Física (GPFEF), Departamento de Ciências Naturais, Universidade do Estado do Pará, 68502-100 Marabá, PA, Brazil;4. Grupo de Nanomateriais Funcionais (GNF), Departamento de Física, Universidade Federal de Sergipe, 49100-000 São Cristóvão, SE, Brazil;5. Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ, Brazil;1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Ul. Okólna 2, 50-422 Wroc?aw, Poland;2. Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668, Warsaw, Poland;1. School of Metallurgy and Chemistry Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China;2. National Engineering Research Center for Ionic Rare Earth, Ganzhou 341000, PR China;3. School of Material Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China;4. Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province, Ganzhou 341000, PR China;1. Key Laboratory of Photo-Electronic Materials, Ningbo University, Ningbo 315211, Zhejiang, China;2. Ningbo Institute of Materials Technology and Engineering, the Chinese Academy of Sciences, Ningbo 315211, Zhejiang, China;3. Department of Physics, Dalian Maritime University, Dalian 116026, Liaoning Province, China;1. Department of Physics, Chandigarh University, Mohali, Punjab, 140413, India;2. Y.M.C.A. University of Science and Technology, Faridabad, 121006, Haryana, India;3. Institute of Forensic Science & Criminology, Panjab University, Chandigarh 160 014, India;4. Department of Physics, National Institute of technology, Srinagar, J&K, 190006, India |
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| Abstract: | NaYF4 microcrystals co-doped with Ho3+ and Yb3+ were prepared by a facile hydrothermal synthesis. The products were characterized by X-ray diffractometer, scanning electron microscopy, and photoluminescence spectroscopy. Upon excitation with a 980 nm laser diode, the sample shows an intense green upconversion emission centered at 540 nm corresponding to the 5S2→5I8 transition of Ho3+. The quadratic dependence of the green emission intensity on the excitation power reveals a two-phonon upconversion process. On the contrary, upon excitation with 448 nm, both visible and near-infrared emissions peaked at 483, 540, 644, 749, and 978 nm are simultaneously observed, which could be assigned to the electronic transitions of Ho3+: 5F3→5I8, 5S2→5I8, 5F5→5I8, 5S2→5I7, and Yb3+: 2F5/2→2F7/2, respectively. The energy transfer processes between Ho3+ and Yb3+ ions and the involved mechanisms have been investigated and discussed. |
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