Biswas, Kaushik and Sontakke, Atul D and Ghosh, Jiten and Annapurna, K (2010) Enhanced Blue Emission from Transparent Oxyfluoride Glass-Ceramics Containing Pr3+:BaF(2) Nanocrystals. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 93 (4). pp. 1010-1017. ISSN 0002-7820

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Transparent glass-ceramics containing Pr3+:BaF(2) nanocrystals in the chemical composition of SiO(2)-BaF(2)-K(2)CO(3)-La(2)O(3)-Sb(2)O(3) oxyfluoride glass systems have been prepared from melt quenching and with a subsequent heat-treatment method. The luminescence and structural properties of these materials have been evaluated and the results are reported. Rietveld analysis of X-ray diffraction patterns and investigation of transmission electron microscopy confirmed the presence of BaF(2) nanocrystals dispersed in the heat-treated glass matrices. Measured UV-Vis-NIR absorption spectra exhibited nine bands of the transitions 3H(4)-> 3P(2), (1I(6), 3P(1)), 3P(0), 1D(2), 1G(4), 3F(3), 3F(2), 3H(6), and 3H(5) from all the samples with nondegenerated 1I(6) and 3P(1) levels in the glass-ceramics. The photoluminescence spectra show an enhancement in the intensities upon ceramization, indicating the incorporation of Pr3+ ions into BaF(2) nanocrystals that possess a low phonon energy (346 cm-1). This has further been corroborated from the observation of a significant threefold increase in the relative intensity ratio of blue (3P(0)-> 3H(4)) to red (1D(2)-> 3H(4), 3P(0)-> 3H(6)) emissions from glass-ceramics compared with the glass. This is due to a significant decrease of multiphonon nonradiative relaxation from the 3P(0) to the 1D(2) level of Pr3+ in glass-ceramics. Time-resolved spectra exhibit 3P(0)-level decays faster than the 1D(2) level.

Item Type: Article
Subjects: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 01 Feb 2012 11:42
Last Modified: 13 Feb 2012 08:00

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