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 Enhanced photoluminescence features of Eu(3+)-modified di-ureasil-zirconium oxocluster organic-inorganic hybrids
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/7041

title: Enhanced photoluminescence features of Eu(3+)-modified di-ureasil-zirconium oxocluster organic-inorganic hybrids
authors: Ferreira, R. A. S.
Oliveira, D. C.
Maia, L. Q.
Vicente, C. M. S.
André, P. S.
Bermudez, V. Zea
Ribeiro, S. J. L.
Carlos, L. D.
keywords: Organic/inorganic di-ureasil hybrids
Eu3+
Photoluminescence
Emission quantum yields
issue date: 2010
abstract: In this work, a series of transparent di-ureasil hybrids containing different amounts of methacrylic acid modified zirconium tetrapropoxide (ZrMcOH) nanoclusters (5-85 mol%) and incorporating EuCl(3) and [Eu(tta)(3)(H(2)O)(2)](tta = thenoyltrifluoroacetonate) complex were prepared. These hybrids are multi-wave-length emitters due to the convolution of the host intrinsic emission (electron-hole recombinations occurring in siliceous and urea cross-linkages) Eu(3+) intra-4f(6) transitions. The ZrMcOH incorporation deviates the maximum excitation wavelength of the hybrid host intrinsic emission from the UV (365 nm) to the blue (420 nm) and enhances the absolute emission quantum yield from 6.0 +/- 0.6% to 9.0 +/- 0.9%, and contributes to an increase in the (5)D(0) lifetime values, quantum efficiency due to a decrease in the non-radiative transition probability and OH groups coordinated to the Eu(3+) ions. (C) 2010 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/10773/7041
ISSN: 0925-3467
publisher version/DOI: http://dx.doi.org/10.1016/j.optmat.2010.05.028
source: Optical Materials
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