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Upconversion luminescence properties of nanocrystallite MgAl2O4 spinel doped with Ho3+ and Yb3+ ions
Affiliation:1. School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China;2. Shandong Co-Innovation Center of Green Building, Jinan 250101, Shandong, China;3. School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, Shandong, China;1. Institute of Low Temperature and Structure Research, PAS, Okolna 2, 50-422 Wroclaw, Poland;2. Université Clermont Auvergne, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, BP 10448, F-63000 Clermont-Ferrand, France;1. Institute for Low Temperatures and Structure Research, Polish Academy of Sciences, PN 1410, 50-950 Wroclaw, Poland;2. B. Verkin Institute for Low Temperature Physics and Engineering of NAS Ukraine, Prospekt Nauky 47, Kharkov 61103, Ukraine;1. B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Pr. Independency, 68, Minsk, 220072, Belarus;2. Belarusian National Technical University, Pr. Independency, 65, Minsk, 220013, Belarus;3. Leibniz Institute of Photonic Technology (IPHT), 07702, Jena, Germany;1. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, PR China;2. LiangXin College, China Jiliang University, Hangzhou 310018, PR China;3. Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, PR China
Abstract:The upconversion luminescence spectra of nanocrystallite MgAl2O4 doped with 1% of Ho3+ and 5% of Yb3+ ions after excitation at 980 nm were measured. Influence of excitation regime either continuous or pulse on upconversion mechanisms was shown. For continuous wave (CW) laser excitation upconversion process is due to phonon assisted Excited State Absorption (ESA). For pulse laser excitation upconversion emission is due to Energy Transfer Upconversion (ETU).
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