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8 March 2014 Upconversion properties of Er3+-doped oxyfluoride glass-ceramics containing SrF2 nanocrystals
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Proceedings Volume 8987, Oxide-based Materials and Devices V; 89871J (2014)
Event: SPIE OPTO, 2014, San Francisco, California, United States
Er3+-doped oxyfluoride glass and glass-ceramics containing SrF2 nanocrystals have been prepared and investigated their spectroscopic and luminescence properties. The formation of SrF2 nanocrystals in glass-ceramics were confirmed by Xray diffraction (XRD) and transmission electron microscopy (TEM). Judd-Ofelt parameters have been evaluated from absorption spectra of the Er3+-doped glass, which in turn used to predict radiative properties for the fluorescent levels of Er3+ ions. The intensities of both Stokes and upconversion (anti-Stokes) emissions significantly increase with increase of the size of the fluoride crystals in the glass matrix. The mechanism of green and red upconversion emissions have been ascribed to two photon processes. The lifetime of the 4S3/2 level of the Er3+ ions in glass-ceramics is found to be slightly higher than that of the counter glass, which may be due to the incorporation of Er3+ ions into the low phonon sites of SrF2 nanocrystals.
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C. R. Kesavulu, K. Kiran Kumar, and C. K. Jayasankar "Upconversion properties of Er3+-doped oxyfluoride glass-ceramics containing SrF2 nanocrystals", Proc. SPIE 8987, Oxide-based Materials and Devices V, 89871J (8 March 2014);

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