Phys. Rev. Lett. 102, 136801 (2009) [4 pages]Bright and Grey States in CdSe-CdS Nanocrystals Exhibiting Strongly Reduced BlinkingReceived 18 August 2008; published 30 March 2009 When compared to standard colloidal nanocrystals, individual CdSe-CdS core-shell nanocrystals with thick shells exhibit strongly reduced blinking. Analyzing the photon statistics and lifetime of the on state, we first demonstrate that bright periods correspond to single photon emission with a fluorescence quantum efficiency of the monoexcitonic state greater than 95%. We also show that low intensity emitting periods are not dark but correspond to a grey state, with a fluorescence quantum efficiency of 19%. From these measurements, we deduce the radiative lifetime (45 ns) and the Auger lifetime (10.5 ns) of the grey state. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.136801
DOI:
10.1103/PhysRevLett.102.136801
PACS:
73.63.Bd, 42.50.Ar, 73.22.−f
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