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Controlling Fluorescence Lifetime of Rare-Earth Element in Amorphous Inorganic Solids Via Very Small Compositional Adjustments

Choi, Y G, Curry, R J, Park, B J, Kim, K H, Heo, J and Hewak, D W (2005) Controlling Fluorescence Lifetime of Rare-Earth Element in Amorphous Inorganic Solids Via Very Small Compositional Adjustments Journal of Applied Physics, 98 (2). ISSN 00218979

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Abstract

Fluorescence lifetime of hypersensitive 4f-4f transitions of rare-earth elements embedded in amorphous inorganic solids can be dramatically modified by compositional adjustment of the hosts tantamount to not more than 1 mol % without any elaborated thermal treatments. It is possible to modify a spontaneous emission rate of Dy3+:(F-6(11/2),H-6(9/2))->H-6(15/2) transition in chalcogenide Ge-As-S glasses through selective addition of low levels of Ga and CsBr. Along with the change of the spontaneous emission rate, multiphonon relaxation rate involved in the (F-6(11/2),H-6(9/2)) state also significantly varies upon the minute compositional adjustment. The combination of these effects results in the measured lifetime of the fluorescing (F-6(11/2),H-6(9/2)) level being greatly enhanced. Such behaviors are attributed to the hypersensitive nature associated with the H-6(15/2)<->F-6(11/2) transition and preferential coordination of bromine in the nearest-neighboring shell of the Dy3+ ions, which is formed spontaneously during the vitrification process of the host materials. These experimental observations show the most extreme dependence of the fluorescence lifetime on small compositional changes reported compared to any other noncrystalline solid-state dielectric. As such coutilization of many hypersensitive transitions of rare-earth elements and those host materials used in this study may present a unique opportunity to control absorption and emission properties, especially fluorescence lifetimes, through a minute compositional adjustment.

Item Type: Article
Additional Information: Published in <i>Journal of Applied Physics,</i> Vol. 98, Iss. 2. Copyright 2005 American Institute of Physics. Click <a href=http://jap.aip.org/>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:07
Last Modified: 23 Sep 2013 18:26
URI: http://epubs.surrey.ac.uk/id/eprint/200

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