Energy transfer and cross-relaxation induced multicolor upconversion emissions in Er~(3+)/Tm~(3+)/Yb~(3+) doped double perovskite La_2ZnTiO_6 phosphors |
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| Affiliation: | 1. School of Material Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;2. Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province, Ganzhou 341000, China;3. School of Metallurgy and Chemistry Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;1. School of Material Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China;2. Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province, Ganzhou 341000, PR China;3. School of Metallurgy and Chemistry Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China;1. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, PR China;2. College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, PR China;3. College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian 350117, PR China;1. CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 PR China;2. University of Chinese Academy of Sciences, Beijing, 100049 PR China;3. State Key Laboratory of Structural Chemistry, Fuzhou, Fujian, 350002 PR China |
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| Abstract: | Investigation on the bright and stable upconversion (UC) phosphors with multicolor emissions is fundamental and significant for the frontier applications of display and temperature probe. Here, diverse emitting colors with blue, cyan and yellowish green, which are caused by the energy transfer and cross-relaxation processes, are obtained by altering Er3+, Tm3+ and Yb3+ concentrations in Er3+ singly, Er3+ - Tm3+ - Yb3+ co- and tri-doped double perovskite La2ZnTiO6 (LZT) phosphors synthesized by a simple solid-state reaction. In addition, excellent infrared emission at 801 nm located at “first biological window” is collected in Tm3+-Yb3+ co-doped phosphors. Meanwhile, the temperature sensing properties based on the thermally coupled levels (2H11/2/4S3/2) of Er3+ ions were analyzed from 298 to 573 K of LZT:0.15Er3+/0.10Yb3+ phosphor, demonstrating that the maximal sensitivity value is about 56 × 10−4 K−1 at 448 K. All these results imply that this kind of UC material has potential applications in display, bioimaging and optical device. |
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| Keywords: | Upconversion Double perovskite Color-tunable Multiple applications Rare earths |
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