Fabrication and properties of transparent Tb:YAG fluorescent ceramics with different doping concentrations |
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| Affiliation: | 1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Crystal Growth, School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China;4. Department of Physics, Shanghai Normal University, Shanghai 200234, China;1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, PR China;2. Shanghai Academy of Criminal Science and Technology, Shanghai Key Laboratory of Crime Scene Evidence, Shanghai 200083, PR China;3. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, PR China;1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Physics, Shanghai Normal University, Shanghai 200234, China;1. Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211, China;2. Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo, Zhejiang, 315211, China;3. Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan |
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| Abstract: | Terbium doped yttrium aluminum garnet (Tb:YAG) transparent ceramics with different doping concentrations were fabricated by the solid-state reaction method using commercial Y2O3, α-Al2O3 and Tb4O7 powders as raw materials. Samples sintered at 1750 °C for 20 h were utilized to observe the optical transmittance, microstructure and fluorescence characteristics. It is found that all the Tb: YAG ceramics with different doping concentrations exhibit homogeneous structures with grain size distributions around 22–29 µm. For the 5 at% Tb:YAG transparent ceramics, the grain boundaries are clean with no secondary phases. The photoluminescence spectra show that Tb:YAG ceramics emit predominantly at 544 nm originated from the energy levels transition of 5D4→7F5 of Tb3+ ions, and the intensity of the emission peak reaches a maximum value when the Tb3+ concentration is 5 at%. The in-line transmittance of the 5 at% Tb:YAG ceramics is 73.4% at the wavelength of 544 nm, which needs to be further enhanced by optimizing the fabrication process. We think that Tb:YAG transparent ceramics may have potential applications in the high-power white LEDs. |
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| Keywords: | Tb:YAG transparent ceramics Microstructure Fluorescence property Solid-state reactive sintering |
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