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Issue 20, 2017
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Quenching cooperative transitions by destroying Yb3+-clusters

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In our previous study, we have reported the cooperative luminescence of Yb3+-trimers and cooperatively sensitized Gd3+ luminescence by Yb3+-tetramers in a doped CaF2 host. In this study, we experimentally observed an unusual luminescent phenomenon of Gd3+ in CaF2:Yb3+/Gd3+. Upon excitation with a 980 nm laser, the upconversion luminescence of Gd3+ first increases and then decreases in the Gd3+ concentration range of 0–0.9 mol%; this is different from the monotonic increase of Gd3+ luminescence observed in the downconversion spectra via the direct excitation of Gd3+. This special luminescent behavior was indicated to be related to the energy transfer from the Yb3+-tetramers to Gd3+ and the destruction of Yb3+-clusters. Herein, we proposed a new luminescence quenching mechanism, Yb3+-cluster destructive quenching, which was verified by fluorescence dynamic analysis and an optically inactive rare-earth ion-doping experiment.

Graphical abstract: Quenching cooperative transitions by destroying Yb3+-clusters

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The article was received on 16 Mar 2017, accepted on 18 Apr 2017 and first published on 18 Apr 2017

Article type: Communication
DOI: 10.1039/C7CP01678F
Citation: Phys. Chem. Chem. Phys., 2017,19, 12637-12641
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    Quenching cooperative transitions by destroying Yb3+-clusters

    J. Guo, T. Aidilibike, W. Di, Y. Li, X. Liu and W. Qin, Phys. Chem. Chem. Phys., 2017, 19, 12637
    DOI: 10.1039/C7CP01678F

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