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      • Fluorescence Lifetime and Blinking of Individual Semiconductor Nanocrystals on Graphene

        Rogez, Benoî,t,Yang, Heejun,Le Moal, Eric,Lé,vê,que-Fort, Sandrine,Boer-Duchemin, Elizabeth,Yao, Fei,Lee, Young-Hee,Zhang, Yang,Wegner, K. David,Hildebrandt, Niko,Mayne, Andrew,Dujar American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.32

        <P>A new class of optoelectronic nanodevices consisting of 0D semiconductor nanocrystals and 2D single graphene layers is attracting much attention. In particular, such a system may be used to investigate and control the transfer of energy and charge in low-dimensional systems. To this end, the fluorescence dynamics of individual colloidal quantum dots (QDs) on graphene are investigated on both the 10<SUP>–9</SUP>–10<SUP>–8</SUP> s time scale (fluorescence lifetime) and the 10<SUP>0</SUP>–10<SUP>2</SUP> s time scale (blinking statistics) in this paper. We find that (i) a nonradiative energy transfer rate of ≈5 × 10<SUP>8</SUP> s<SUP>–1</SUP> is obtained from the reduced lifetimes of QDs on graphene as opposed to those on insulating substrates such as glass; (ii) QDs still exhibit fluorescence intermittency (“blinking”) on graphene; (iii) the cumulative distribution functions of the “off” times may be described by power-law statistics; (iv) QD coupling to graphene increases the time spent in the “on” state while the time spent in the “off” state remains relatively unchanged; and (v) the fluorescence emission spectrum of the QDs is practically unaltered by the QD–graphene coupling.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-32/jp5061446/production/images/medium/jp-2014-061446_0006.gif'></P>

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