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Issue 16, 2011
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Colloidal synthesis and remarkable enhancement of the upconversion luminescence of BaGdF5:Yb3+/Er3+ nanoparticles by active-shell modification

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Abstract

BaGdF5:Yb3+/Er3+ colloidal nanoparticles (NPs) with tunable average particle diameters from 3 to 10 nm in different solvents were first prepared by thermal decomposition method. X-Ray diffraction (XRD), transmission electron microscopy (TEM) and upconversion (UC) luminescence spectra were used to characterize the resulting samples. After coating the active shell (containing Yb3+) around the BaGdF5:Yb3+/Er3+ NPs, not only their morphology and monodisperse properties were well maintained but also the relative UC luminescence intensity was enhanced remarkably. In contrast to the pure BaGdF5:Yb3+/Er3+ core, the luminescence intensity of the active-shell coated NPs can be enhanced several hundred times. Unexpectedly, the luminescence intensity of the active-core/active-shell NPs was about four times as high as that of β-NaYF4:Yb3+/Er3+ NPs under the same doping concentration and measurement conditions. Moreover, the luminescence colors of the active-core/active-shell NPs can be tuned from green to yellow by multilayer active-shell coating under 980 nm laser excitation.

Graphical abstract: Colloidal synthesis and remarkable enhancement of the upconversion luminescence of BaGdF5:Yb3+/Er3+ nanoparticles by active-shell modification

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Publication details

The article was received on 01 Dec 2010, accepted on 17 Feb 2011 and first published on 10 Mar 2011


Article type: Paper
DOI: 10.1039/C0JM04179C
J. Mater. Chem., 2011,21, 5923-5927

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    Colloidal synthesis and remarkable enhancement of the upconversion luminescence of BaGdF5:Yb3+/Er3+ nanoparticles by active-shell modification

    D. Yang, C. Li, G. Li, M. Shang, X. Kang and J. Lin, J. Mater. Chem., 2011, 21, 5923
    DOI: 10.1039/C0JM04179C

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