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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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Calcium aluminosilicate glasses, Tb3+ green luminescence, concentration
Subjects:	Glass
Divisions:	Glass
Depositing User:	Mrs Chandana Patra
Date Deposited:	15 Nov 2011 12:10
Last Modified:	11 Jan 2013 06:41
URI:	http://cgcri.csircentral.net/id/eprint/8

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