Excitons
in colloidal semiconductor nanoplatelets (NPLs) are weakly
confined in the lateral dimensions. This results in significantly
smaller Auger rates and, consequently, larger biexciton quantum yields,
when compared to spherical quantum dots (QDs). Here we report a study
of the temperature dependence of the biexciton Auger rate in individual
CdSe/CdS core–shell NPLs, through the measurement of time-gated
second-order photon correlations in the photoluminescence. We also
utilize this method to directly estimate the single-exciton radiative
rate. We find that whereas the radiative lifetime of NPLs increases
with temperature, the Auger lifetime is almost temperature-independent.
Our findings suggest that Auger recombination in NPLs is qualitatively
similar to that of semiconductor quantum wells. Time-gated photon
correlation measurements offer the unique ability to study multiphoton
emission events, while excluding effects of competing fast processes,
and can provide significant insight into the photophysics of a variety
of nanocrystal multiphoton emitters.
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