Intense Upconversion Luminescence of CaSc2O4:Ho3+/Yb3+ from Large Absorption Cross Section and Energy‐Transfer Rate of Yb3+ |
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| Authors: | Prof. Jing Li Jiahua Zhang Zhendong Hao Li Chen Xia Zhang Yongshi Luo |
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| Affiliation: | 1. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun 130033 (China);2. ChangChun University of Technology, A1018 Huguang Road, Changchun 130012 (China) |
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| Abstract: | Concentration‐optimized CaSc2O4:0.2 % Ho3+/10 % Yb3+ shows stronger upconversion luminescence (UCL) than a typical concentration‐optimized upconverting phosphor Y2O3:0.2 % Ho3+/10 % Yb3+ upon excitation with a 980 nm laser diode pump. The 5F4+5S2→5I8 green UCL around 545 nm and 5F5→5I8 red UCL around 660 nm of Ho3+ are enhanced by factors of 2.6 and 1.6, respectively. On analyzing the emission spectra and decay curves of Yb3+: 2F5/2→2F7/2 and Ho3+: 5I6→5I8, respectively, in the two hosts, we reveal that Yb3+ in CaSc2O4 exhibits a larger absorption cross section at 980 nm and subsequent larger Yb3+: 2F5/2→Ho3+: 5I6 energy‐transfer coefficient (8.55×10?17 cm3 s?1) compared to that (4.63×10?17 cm3 s?1) in Y2O3, indicating that CaSc2O4:Ho3+/Yb3+ is an excellent oxide upconverting material for achieving intense UCL. |
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| Keywords: | dynamics energy transfer Ho3+/Yb3+ luminescence phosphors |
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