MgO-Y2O3:Eu composite ceramics with high quantum yield and excellent thermal performance |
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| Affiliation: | 1. School of Rare Earths, University of Science and Technology of China, Hefei 230026, China;2. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China;3. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China;1. Key Laboratory for Liquid–Solid Structural Evolution & Processing of Materials of Ministry of Education, Shandong University, Jinan 250061, PR China;2. Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250061, PR China;1. Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 612 00 Brno, the Czech Republic;2. Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 612 00 Brno, the Czech Republic;3. Centre for Functional and Surface Functionalised Glass, Alexander Dub?ek University of Tren?ín, ?tudentská 2, 91150 Tren?ín, Slovakia;4. TESCAN Brno, s.r.o., Libu?ina t?ída 1, 623 00 Brno, the Czech Republic;5. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, Escuela Politécnica Superior, Universidad de Sevilla, 41011 Seville Spain;6. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, 41092 Seville Spain;7. Joint Glass Centre of the IIC SAS, TnUAD and FChPT STU, ?tudentská 2, 91150 Tren?ín, Slovakia;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;2. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China;3. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Science, Beijing, 100049, China;4. SEC “Advanced Ceramic Materials”, Far Eastern Federal University, 10 Ajax Bay, Russky Island, Vladivostok, 690922, Russian Federation;1. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Center for Excellence in Ultra-intense Laser Science, Chinese Academy of Sciences, Shanghai, 201800, China;4. Shanghai Academy of Spaceflight Technology, Shanghai, 201109, China |
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| Abstract: | MgO-Y2O3:Eu composite ceramics with high quantum yield and excellent thermal performance were successfully synthesized by vacuum sintering. All samples exhibited uniform composite microstructures and pure binary phase. Eu3+ ions were completely incorporated into Y2O3 phase, and the optimal Eu concentration is 15 at%. Sintered at 1800 °C, the fluorescent properties of MgO- z vol% Y2O3: Eu (z = 30, 40, 50, 60, 70, 100) composites proved to be independent on component proportion, including the similar fluorescence lifetimes (953–983 μs), quantum yield (70%?80%), and activation energy (ΔE) of thermal quenching (0.163 eV). Significantly, thermal conductivity of composites with 30 vol%, 50 vol% and 70 vol% MgO attained 11.58, 17.45, and 29.65 W/(m?K) at room temperature, which are nearly 2, 3, and 5 times as high as that of 15 at% Eu:Y2O3 ceramic (5.90 W/(m?K)), respectively, demonstrating their potential for application in high-power-density display and lighting technology. |
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| Keywords: | Composite ceramics Thermal conductivity Quantum yield |
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