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Ionic liquid-based synthesis of luminescent YVO4:Eu and YVO4:Eu@YF3 nanocrystals

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Abstract

Luminescent YVO4:Eu nanocrystals were prepared via an ionic liquid-based synthesis. According to electron microscopy, dynamic light scattering, and X-ray diffraction, the presence of uniform and highly crystalline particles, 12–15 in diameter is validated. As-prepared particles turn out to be nonagglomerated and redispersible. Photoluminescence exhibits characteristic red emission related to Eu3+. Quantum yield of as-prepared YVO4:Eu (15 mol%) is determined to 17–19%. The quantum yield of as-prepared material increases to 44–46% by establishing an YVO4:Eu@YF3 core-shell structure. Since the lattice planes (001) of YVO4 and (100) of YF3 match very well, a crystalline YF3 shell, 1–2 nm in thickness protects the YVO4 core very efficiently. Besides the significantly increased quantum yield, the presence of a core-shell structure is further evidenced by electron energy loss spectroscopy. Element mapping revealed high intensities of Eu in the inner parts, associated with low peripheral fluorine intensities.

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Acknowledgements

The authors are grateful to Dr. R. Popescu and Prof. Dr. D. Gerthsen for performing TEM analysis. We also acknowledge the DFG Center for Functional Nanostructures (CFN) at the University of Karlsruhe (TH) for financial support.

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Authors and Affiliations

  1. Institut für Anorganische Chemie, Universität Karlsruhe (TH), Engesserstraße 15, 76131, Karlsruhe, Germany

    Aksana Zharkouskay & Claus Feldmann

  2. Helmholtz-Zentrum für Infektionsforschung GmbH, Inhoffenstraße 7, 38124, Braunschweig, Germany

    Heinrich Lünsdorf

Authors
  1. Aksana Zharkouskay
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  2. Heinrich Lünsdorf
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  3. Claus Feldmann
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Correspondence to Claus Feldmann.

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Zharkouskay, A., Lünsdorf, H. & Feldmann, C. Ionic liquid-based synthesis of luminescent YVO4:Eu and YVO4:Eu@YF3 nanocrystals. J Mater Sci 44, 3936–3942 (2009). https://doi.org/10.1007/s10853-009-3532-6

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  • DOI: https://doi.org/10.1007/s10853-009-3532-6

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