Concentration Dependent Luminescence of Tb3+ ions in high Calcium-Alumino-Silicate Glasses
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Concentration Dependent Luminescence of Tb3+ ions in
high Calcium-Alumino-Silicate Glasses
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| Creator |
Sontakke, Atul D
Biswas, Kaushik Annapurna, K |
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| Subject |
Glass
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| Description |
This study deals with the results on the concentration dependent fluorescence properties of Tb3+-doped calcium aluminosilicate (CAS) glasses of composition (100-
x)(58SiO2-23CaO-5Al2O3-4MgO-10NaF in mol%)-x Tb2O3 (x = 0, 0.25, 0.5, 1, 2, 4, 8, 16, 24, 32, 40 in wt%). The FTIR reflectance spectra suggested the role of dopant
ions as network modifiers in the glass network. The fluorescence spectra of low Tb3+-doped glasses have revealed prominent blue and green emissions from 5D3 and 5D4
excited levels to 7Fj ground state multiplet respectively. The glass with 2 wt% of Tb2O3 has exhibited maximum intensity of blue emission from 5D3 level, while green
emission from 5D4 level has increased linearly up to 24 wt% and showed reduction in the rate of increase for higher Tb2O3 concentrations. The concentration quenching of
blue emission (5D3 7Fj) is attributed mainly to the resonant energy transfer (RET)assisted cross-relaxation (CR) among the excited and nearest neighbour unexcited
Tb3+ ions in the glass matrix. The decline in rate of increase of green emission (5D4 7Fj) at higher concentrations has been explained due to a possible occurrence of cooperative energy transfers leading to 4f8®4f75d transition interactions. The blue and green emission decay kinetics have been recorded to compute the excited level (5D3 and 5D4) lifetimes, which confirmed the Tb3+ concentration quenching of the blue emission in these glasses.
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| Publisher |
Elsevier
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| Date |
2009
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| Type |
Article
NonPeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/8/1/KB_Journal_of_luminescence[1].pdf
Sontakke, Atul D and Biswas, Kaushik and Annapurna, K (2009) Concentration Dependent Luminescence of Tb3+ ions in high Calcium-Alumino-Silicate Glasses. Journal of Luminescence, 129 (11). pp. 1347-1355. ISSN 0022-2313 |
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| Relation |
http://cgcri.csircentral.net/8/
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