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Issue 20, 2009
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Structural and optical investigation of colloidal Ln3+/Yb3+ co-doped KY3F10nanocrystals

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Abstract

We report for the first time the synthesis of colloidal Ln3+/Yb3+ co-doped KY3F10nanocrystals (Ln = Er or Eu) viathermal decomposition. The transmission electron microscopy (TEM) studies indicated that the average size of the nanocrystals was approximately 15 nm. The nanocrystals crystallized in the cubic Fm[3 with combining macron]m space group as confirmed by Rietveld refinement of the X-ray powder diffraction patterns and by electron diffraction analysis. The Eu3+ ion was used as a spectroscopic probe and its emission spectrum in colloidal KY3F10nanocrystals showed that the lanthanide ions replaces Y3+ in the lattice structure. When co-doped with Er3+/Yb3+, colloidal KY3F10nanocrystals exhibited visible (green and red) upconversion emissions following 978 nm excitation with a near-infrared (NIR) diode laser. Power dependence studies indicated that a two-photon energy transfer upconversion process was responsible for the NIR-to-visible upconversion.

Graphical abstract: Structural and optical investigation of colloidal Ln3+/Yb3+ co-doped KY3F10nanocrystals

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Publication details

The article was received on 08 Jan 2009, accepted on 23 Feb 2009 and first published on 24 Mar 2009


Article type: Paper
DOI: 10.1039/B900300B
J. Mater. Chem., 2009,19, 3149-3152

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    Structural and optical investigation of colloidal Ln3+/Yb3+ co-doped KY3F10nanocrystals

    V. Mahalingam, F. Vetrone, R. Naccache, A. Speghini and J. A. Capobianco, J. Mater. Chem., 2009, 19, 3149
    DOI: 10.1039/B900300B

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