Structure and luminescent properties of oxyfluoride glass-ceramics with YF3:Eu3+ nanocrystals derived by sol-gel method |
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| Affiliation: | 1. Institute of Chemistry, University of Silesia, 9 Szkolna Street, 40-007 Katowice, Poland;2. Institute of Materials Science, University of Silesia, 75. Pułku Piechoty 1A Street, 41-500 Chorzów, Poland;3. Institute of Technology and Mechatronics, University of Silesia, Żytnia 12 Street, 41-200 Sosnowiec, Poland;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. Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai, 200240, China;4. Shanghai Institute of Laser Plasma, Chinese Academy of Engineering Physics, Shanghai, 201800, China;1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea;2. Agency for Defense Development, Yuseong P. O. Box 35, Daejeon, 34186, Republic of Korea;1. Ceramic Physics Laboratory, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan;2. Department of Materials Science and Engineering, Shanghai University, Shanghai, PR China;3. Department of Orthopaedic Surgery, Tokyo Medical University, 6-7-1, Nishi-Shinjuku, Shinjuku-ku, 160-0023 Tokyo, Japan;4. The Center for Advanced Medical Engineering and Informatics, Osaka University, Yamadaoka, Suita, 565-0871 Osaka, Japan;5. Department of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kamigyo-ku, 465 Kajii-cho, Kawaramachi dori 602-0841 Kyoto, Japan |
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| Abstract: | In this paper, the transparent oxyfluoride glass-ceramic materials containing YF3:Eu3+ nanocrystals were fabricated via controlled ceramization of precursor xerogels at relatively low temperature T = 350 °C. The formation of YF3 nanocrystalline phase from Y(CF3COO)3 was verified based on X-ray diffraction (XRD) measurements as well as high-resolution transmittance electron microscopy (HR-TEM). Based on IR-ATR spectroscopy the functional groups inside sol-gel structures were identified. The optical properties of Eu3+ ions in fabricated sol-gel samples were investigated based on photoluminescence excitation and emission spectra as well as luminescence decay analysis of the 5D0 excited level. Upon excitation at near-UV illumination, λexc = 393 nm, the series of 4f6-4f6 photoluminescence bands of Eu3+ ions in reddish-orange light area were recorded. The Stark splitting of photoluminescence bands, double-exponential character of decay curves and long-lived emission for fabricated glass-ceramic samples clearly evidenced the partial substitution of Y3+ by optically active Eu3+ ions in precipitated YF3 nanocrystals. Indeed, it was identified that applied annealing conditions resulted in significant, almost 34-fold prolongation of luminescence lifetime from 0.24 ms (Eu3+ ions in xerogel host) up to 8.14 ms (Eu3+ ions incorporated into YF3 nanocrystals). It was also observed a clear correlation between identified phonon energies from IR measurements and luminescence behavior of Eu3+ ions. |
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| Keywords: | Sol-gel technique Glass-ceramics |
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