Biswas, Kaushik and Sontakke, Atul D and Ghosh, Jiten and Annapurna, K (2010) Enhanced Blue Emission from Transparent Oxyfluoride Glass Ceramics Containing Pr3+:BaF2 Nano-crystals. Journal of the American Ceramic Society, 93 (4). pp. 1010-1017. ISSN 0002-7820 (Submitted)

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Transparent glass ceramics containing Pr3+:BaF2 nano-crystals in chemical composition of SiO2–BaF2–K2CO3–La2O3-Sb2O3 oxyfluoride glass systems have been prepared from melt quenching and with subsequent heat-treatment method. Luminescence and structural properties of these materials have been evaluated and the results are reported. Rietveld analysis of X-ray diffraction (XRD) patterns and investigation of transmission electron microscopy (TEM) confirmed the presence of BaF2 nano-crystals dispersed in the heat treated glass matrices. Measured UV-Vis-NIR absorption spectra have exhibited nine bands of the transitions 3H4 3P2, (1I6, 3P1), 3P0, 1D2, 1G4, 3F3,3F2, 3H6 and 3H5 from all the samples with non-degenerated 1I6 and 3P1 levels in the glass ceramics. The photoluminescence spectra show an enhancement in the intensities upon ceramization indicating the incorporation of Pr3+ ions in BaF2 nano-crystals which possess low phonon energy (346 cm-1). This has further been corroborated from the observation of a significant 3-fold increase in the relative intensity ratio of blue (3P0 3H4) to red (1D2 3H4, 3P0 3H6)emissions from glass-ceramics compared with the glass. It is due to a significant decrease of multiphonon non-radiative relaxation from 3P0 to 1D2 level of Pr3+ in glass ceramics. Time resolved spectra exhibit 3P0 level decays faster than 1D2 level.

Item Type: Article
Uncontrolled Keywords: Oxyfluoride transparent glass-ceramics; Pr3+:BaF2 nano-crystals; luminescence
Subjects: Glass
Divisions: Glass
Depositing User: Mrs Chandana Patra
Date Deposited: 15 Nov 2011 11:30
Last Modified: 11 Jan 2013 06:29

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