Enhanced Blue Emission from Transparent Oxyfluoride Glass Ceramics Containing Pr3+:BaF2 Nano-crystals
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Enhanced Blue Emission from Transparent Oxyfluoride Glass Ceramics Containing Pr3+:BaF2 Nano-crystals
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| Creator |
Biswas, Kaushik
Sontakke, Atul D Ghosh, Jiten Annapurna, K |
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| Subject |
Glass
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| Description |
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.
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| Publisher |
Wiely / American Ceramic Society
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| Date |
2010-04
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| Type |
Article
NonPeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/5/1/KB_journal_of_american_ceramic_society[1].pdf
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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| Relation |
http://cgcri.csircentral.net/5/
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