  Intermittent photoluminescence of colloidal core/shell semiconductor
nanocrystals of spherical and branched shape was studied under CW-laser
excitation. Luminescent multichannel registration system was applied for the
fluorescence detection of single quantum dots (QDs) in the polystyrene matrix.
Comparative statistical data were obtained and analyzed for nano-sphere
CdSe/CdS and nano-tetrapod CdTe/CdSe crystals. It was found that "on-" and
"off-" blinking times are distributed according to the power law both for
spherical CdSe/CdS and tetrapod shape CdTe/CdSe samples in spite of significant
QD formfactor differences. We have also found that regardless of the QD-shape
both successive "on"-times and successive "off "-times are correlated and
pointing out to the memory effect in the mechanism of QD re-emission comprising
the prehistory of exciton birth and recombination. Pearson-s co-efficients were
calculated for the correlations of QD-luminescence behavior. Results of
experimental measurements were compared with the peculiarities of relevant
phe-nomenon models proposed to date. The data obtained can be used for
development of nanophotonic applications and nanocomposite light-emitting
materials
