Dhanaraj, J. and Geethalakshmi, M. and Jagannathan, R. and Kutty, T.R.N. (2004) Eu3+ dopped yttrium oxysulfide nanocrystals – crystallite size and luminescence transition(s). Chemical Physics Letters, 387 (1). pp. 23-28. ISSN 0009-2614

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Nanocrystals of yttrium oxysulfide doped with trivalent europium has been synthesized using a two step sol–gel polymer thermolysis method employing urea formaldehyde resin in the presence of ethylene diamine tetra acetic acid as chelating agent. In this synthesis, marginal tunability in crystallite size (/ ¼ 7–15 nm) was achieved by varying the concentration of reactants and organic precursors. In this nanocrystalline system, various luminescence transitions, in particular 5D0!7F2 transition of Eu3þ shows moderate (~ 60%) lifetime shortening which can be explained by considering possible increase in non-radiative rate (snr) and also possible modification in optical electronegativity induced by surface states of the crystallites.

Item Type: Article
Subjects: Electrochemical Materials Science
Depositing User: ttbdu cecri
Date Deposited: 05 Apr 2012 11:03
Last Modified: 05 Apr 2012 11:03
URI: http://cecri.csircentral.net/id/eprint/914

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