Tarafder, Anal and Molla, Atiar Rahaman and Dey, Chirantan and Karmakar, Basudeb (2013) Thermal, structural, and enhanced photoluminescence properties of Eu3+-doped transparent willemite glass-ceramic nanocomposites. Journal of the American Ceramic Society, 96 (8). pp. 2424-2431. ISSN 0002-7820

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The precursor glass in the ZnO-Al2O3-B2O3-SiO2 (ZABS) system doped with Eu2O3 was prepared by the melt-quench technique. The transparent willemite, Zn2SiO4 (ZS) glass-ceramic nanocomposites were derived from this precursor glass by a controlled crystallization process. The formation of willemite crystal phase, size, and morphology with increase in heat-treatment time was examined by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) techniques. The average calculated crystallite size obtained from XRD is found to be in the range 18-70nm whereas the grain size observed in FESEM is 50-250nm. The refractive index value is decreased with increase in heat-treatment time which is caused by the partial replacement of ZnO4 units of ZS nanocrystals by AlO4 units due to generation of vacancies. Fourier transform infrared (FTIR) reflection spectroscopy was used to evaluate its structural evolution. Vickers hardness study indicates marked improvement of hardness in the resultant glass-ceramics compared with its precursor glass. The photoluminescence spectra of Eu3+ ions exhibit emission transitions of (D0Fj)-D-5-F-7 (j=0, 1, 2, 3, and 4) and its excitation spectra show an intense absorption band at 395nm. These spectra reveal that the luminescence performance of the glass-ceramic nanocomposites is enhanced up to 17-fold with the process of heat treatment. This enhancement is caused by partitioning of Eu3+ ions into glassy phase instead of into the willemite crystals with progress of heat treatment. Such luminescent glass-ceramic nanocomposites are expected to find potential applications in solid-state red lasers, phosphors, and optical display systems.

Item Type: Article
Subjects: Glass
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 06 Feb 2014 08:30
Last Modified: 06 Feb 2014 08:30
URI: http://cgcri.csircentral.net/id/eprint/2494

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