Journal
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
Volume 12, Issue 6, Pages 272-284Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.cocis.2007.07.012
Keywords
single molecules; single semiconductor nanocrystals; intermittency; luminescence; charge transfer; traps; self-trapping; power-law; stretched kinetics; random walk; blinking; quantum dots; II-VI semiconductors; silicon
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We summarize experimental observations of fluorescence intermittency of single semiconductor nanocrystals and single molecules. We review the main models proposed earlier to explain the broad power-law distributions of on- and off-blinking times. We argue that a self-trapping model with a distribution of trapping distances can account for most, if not all, observations to date. We propose possible scenarios for photo-ionization, the switching to states with long on-times and the influence of disorder and surfaces on the trapping dynamics. (c) 2007 Elsevier Ltd. All rights reserved.
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