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Issue 47, 2006
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Eu3+-doped CdS nanocrystals in SiO2 matrices: one-pot sol–gel synthesis and optical characterization

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Abstract

An enhancement of the europium luminescence has been reported in Eu-doped SiO2 materials by interaction with adsorbed CdS nanoparticles. In this paper, the preparation of homogeneous Eu3+-doped CdS nanocrystals embedded in SiO2 sol–gel matrices by a simple “one-pot” method is reported. The synthesis conditions have been varied in order to modify the distribution of the lanthanide ions and the CdS nanoparticles within the nanocomposite. The structural modifications involve different strengths in the Eu3+–CdS interaction. The effect of these interactions on the Eu3+ luminescence is discussed. The absorption, excitation and emission spectra of the Eu3+ species, as well as the time-resolved luminescence, revealed the existence of an efficient CdS → Eu3+ energy transfer, responsible for the increase in the fluorescence intensity. However, when these species are spatially close, a diminution of the total emission and lifetime values is observed as a result of a back transfer from the Eu3+ ions to CdS nanoparticles.

Graphical abstract: Eu3+-doped CdS nanocrystals in SiO2 matrices: one-pot sol–gel synthesis and optical characterization

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Publication details

The article was received on 30 Aug 2006, accepted on 26 Sep 2006 and first published on 12 Oct 2006


Article type: Paper
DOI: 10.1039/B612519K
Citation: J. Mater. Chem., 2006,16, 4612-4618
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    Eu3+-doped CdS nanocrystals in SiO2 matrices: one-pot sol–gel synthesis and optical characterization

    B. Julián, J. Planelles, E. Cordoncillo, P. Escribano, P. Aschehoug, C. Sanchez, B. Viana and F. Pellé, J. Mater. Chem., 2006, 16, 4612
    DOI: 10.1039/B612519K

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