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Issue 41, 2014
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Photocontrol of luminescent inorganic nanocrystals via an organic molecular switch

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Abstract

A photo-controlled and quasi-reversible switch of the luminescence of hexadecylamine-coated ZnO nanocrystals (ZnO@HDA Ncs) is operated via a molecular photoswitch (dithienylethene, DTE). The interaction between the DTE switch and the ZnO@HDA Ncs is thoroughly investigated using NMR spectroscopy techniques, including DOSY and NOESY, showing that the DTE switch is weakly adsorbed at the surface of the Ncs through the formation of hydrogen bonds with HDA. Steady state and time-resolved luminescence quenching experiments show a complex behavior, related to the spatial distribution of the emitting defects in the Ncs. Analysis of the data using models previously developed for Ncs supports static quenching. Both isomeric forms (open or closed) of the DTE switch quench the emission of Ncs, the efficiency being more than ten times higher for the closed isomer. The mechanism of quenching is discussed and we show that quenching occurs mainly through resonant energy transfer for the closed isomer and through electron transfer for the open one. The HDA layer mediates the quenching efficiency as only defects located near the surface are quenched.

Graphical abstract: Photocontrol of luminescent inorganic nanocrystals via an organic molecular switch

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Publication details

The article was received on 07 Aug 2014, accepted on 10 Sep 2014 and first published on 10 Sep 2014


Article type: Paper
DOI: 10.1039/C4CP03537B
Author version available: Download Author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2014,16, 22775-22783
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    Photocontrol of luminescent inorganic nanocrystals via an organic molecular switch

    J. Massaad, Y. Coppel, M. Sliwa, M. L. Kahn, C. Coudret and F. Gauffre, Phys. Chem. Chem. Phys., 2014, 16, 22775
    DOI: 10.1039/C4CP03537B

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