Biswas, Kaushik and Sontakke, Atul D and Sen, Ranjan and Annapurna, K (2013) Enhanced 2 mu m broad-band emission and NIR to visible frequency up-conversion from Ho3+/Yb3+ co-doped Bi2O3-GeO2-ZnO glasses. Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy, 112. pp. 301-308. ISSN 1386-1425

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In this work, a new and non-conventional oxide glass composition based on Bi2O3-GeO2-ZnO system has been formulated with an aim to realize low phonon oxide glass and elucidate its performance when co-doped with Ho3+/Yb3+ for the energy transfer based NIR emission at 2 mu m from Ho3+ ions under Yb3+ excitation. The glass with 1.0 mol% Ho2O3 and 0.5 mol% Yb2O3 has exhibited maximum energy transfer rate (3602 s(-1)) and energy transfer efficiency (65.92%). Important radiative properties have been predicted for emission transitions of Ho3+ ions using intensity parameters derived from measured absorption spectra using standard Judd-Ofelt theory. At lower acceptor ion concentration (0.1 mol%), an efficient NIR to visible up-conversion emission has been observed based on two photon absorption process which has found to be reduced significantly at higher Ho3+ concentrations with simultaneous enhancement in 2 mu m emission. Hence, this newly developed glass codoped with Yb3+/Ho3+ is promising glass for sensitized 2 mu m emission applications as broad band tunable lasers because of the combination of low phonon energy (707 cm(-1)), high energy transfer efficiency, moderately high emission cross-section (5.33 x 10(-21) cm(2)) and larger effective half-width of the emission band value of 169 nm. (c) 2013 Elsevier B.V. All rights reserved.

Item Type: Article
Subjects: Glass
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 04 Sep 2013 11:23
Last Modified: 12 Mar 2016 15:34

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