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Issue 17, 2012
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Lanthanum-doped ZnO quantum dots with greatly enhanced fluorescent quantum yield

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Abstract

The lanthanum-doped ZnO quantum dots (QDs) are synthesized by a modified sol–gel method under atmospheric conditions. The as-prepared quantum dots are characterized by X-ray powder diffraction, energy dispersion spectrum analysis and high resolution transmission electron microscopy. The optical properties of the products are studied by ultra-violet spectroscopy and fluorescent spectroscopy. The results show that the doped quantum dots exhibit greatly enhanced luminescent properties and their quantum yield centered around 495 nm is increased from 30.5% for un-doped ZnO QDs already improved by silane surface modification to 77.9% for La-doped ZnO QDs at a proper La-doping content, which is the highest reported so far for the green-emitting ZnO QDs. Positron annihilation spectroscopy is employed to probe the vacancy-type defects of ZnO QDs. Finally, anti-counterfeiting inks are prepared by incorporating La-doped ZnO QDs into the transparent oil and their possible potential applications are explored.

Graphical abstract: Lanthanum-doped ZnO quantum dots with greatly enhanced fluorescent quantum yield

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Publication details

The article was received on 04 Jan 2012, accepted on 27 Feb 2012 and first published on 16 Mar 2012


Article type: Paper
DOI: 10.1039/C2JM00040G
Citation: J. Mater. Chem., 2012,22, 8221-8227
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    Lanthanum-doped ZnO quantum dots with greatly enhanced fluorescent quantum yield

    L. Sun, H. Shi, W. Li, H. Xiao, S. Fu, X. Cao and Z. Li, J. Mater. Chem., 2012, 22, 8221
    DOI: 10.1039/C2JM00040G

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