Som, Tirtha and Karmakar, Basudeb (2011) Plasmonic Au(x)Ag(y) bimetallic alloy nanoparticles enhanced photoluminescence upconversion of Er(3+) ions in antimony glass hybrid nanocomposites. Journal of Modern Optics, 58 (12). pp. 1012-1023. ISSN 0950-0340

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Abstract

Er(3+) ions and spherical (3-23 nm) Au(x)Ag(y) bimetallic alloy (where x = 18-96 and y = 4-82, atom %) nanoparticles incorporated novel antimony oxide based reducing dielectric (glass) matrix, K(2)O-B(2)O(3)-Sb(2)O(3) (KBS), has been synthesized by a new single step methodology involving selective thermochemical reduction. Their absorption spectra show a single tunable (536-679 nm) surface plasmon resonance band along with the typical absorption peaks of the Er(3+) ion. X-ray and SAED indicate the formation of (111) and (200) planes of Au(x)Ag(y) alloy. The luminescence intensity of two prominent emission bands of Er(3+) ions centered at 536 (green) and 645 (red) nm due to (4)S(3/2) -> (4)I(15/2) and (4)F(9/2) -> (4)I(15/2) transitions were observed to be strongly dependent on the Au(x)Ag(y) nanoparticle composition. Both the bands undergo a maximum of 1.5- and 4.5-fold intensity enhancement respectively in the presence of the Ag(56)Au(44) alloy (atom %) due to plasmon induced local field enhancement.

Item Type:	Article
Uncontrolled Keywords:	gold-silver alloy nanoparticles; erbium (III); nanocomposite; upconversion; enhanced fluorescence; antimony oxide glass
Subjects:	Glass
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	20 Jan 2012 04:47
Last Modified:	25 Feb 2013 08:37
URI:	http://cgcri.csircentral.net/id/eprint/418

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