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$Eu^{3+}$ doped yttrium oxysulfide nanocrystals – crystallite size and luminescence transition(s)

Dhanaraj, J and Geethalakshmi, M and Jagannathan, R and Kutty, TRN (2004) $Eu^{3+}$ doped yttrium oxysulfide nanocrystals – crystallite size and luminescence transition(s). In: Chemical Physics Letters, 387 (1-3). pp. 23-28.

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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 (phi = 7-15 nm) was achieved by varying the concentration of reactants and organic precursors. In this nanocrystalline system, various luminescence transitions, in particular D-5(0) --> F-7(2) transition of Eu3+ shows moderate (similar to60%) lifetime shortening which can be explained by considering possible increase in non-radiative rate (tau(nr)) and also possible modification in optical electronegativity induced by surface states of the crystallites.

Item Type: Journal Article
Publication: Chemical Physics Letters
Publisher: Elsevier B. V.
Additional Information: Copyright of this article beloongs to Elsevier.
Keywords: Rare-earth ions;1st-principles;intensities.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 19 Dec 2008 03:21
Last Modified: 19 Sep 2010 04:54
URI: http://eprints.iisc.ac.in/id/eprint/16934

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