Som, Tirtha and Karmakar, Basudeb (2010) Enhanced frequency upconversion of Sm(3+) ions by elliptical Au nanoparticles in dichroic Sm(3+): Au-antimony glass nanocomposites. Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy, 75 (2). pp. 640-646. ISSN 1386-1425

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Abstract

Dichroic Sm(3+): Au-antimony glass nanocomposites are synthesized in a new reducing glass (dielectric) matrix (mol%) K(2)O-B(2)O(3)-Sb(2)O(3) (KBS) by a single-step melt-quench technique involving selective thermochemical reduction. X-ray diffraction (XRD) and selected area electron diffraction (SAED) results indicate that Au(0) nanoparticles are grown along the (200) plane direction. The transmission electron microscopic (TEM) image reveals the elliptical Au(0) nanoparticles having major axis range 12-17 nm. Dichroic behavior is due to elliptical shape of Au(0) nanoparticles of aspect ratio similar to 1.2. Au(0) NPs of concentration of 0.03 wt% (4.1 x 10(18) woms/cm(3)) drastically enhances the intensity (similar to 7-folds) of electric dipole (4)G(5/2) -> (6)H(9/2) red transition (636 nm) of Sm(3+) ions and then attenuates with further increase in Au(0) concentration. The magnetic dipole (4)G(5/2) -> (6)H(5/2) green (566 nm) and (4)G(5/2) -> (6)H(7/2) orange (602 nm) transitions remain almost unaffected by presence of ano Au(0). Local field enhancement (LIFE) induced by Au(0) SPR and energy transfer (ET) from fluorescent Au(0) -> Sm(3+) ions are found to be responsible for the enhancement while reverse ET from Sm(3+) -> Au(0) and optical re-absorption due to Au(0) SPR for attenuation. (C) 2009 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Nano gold; Samarium (III); Nanocomposite; Enhanced upconversion; Fluorescence; Dichroic; Antimony glass
Subjects:	Glass
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Feb 2012 10:24
Last Modified:	28 Mar 2016 17:10
URI:	http://cgcri.csircentral.net/id/eprint/919

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