The ability to manipulate and confine excitons in colloidal QDs allows for their broad range of optoelectronic applications.  Exciton properties are measured using ensemble photoluminescence (PL), for which the linewidth and quantum yield presents a rapid analytical tool for determining synthetic qualtiy.  However, for this tool to work, we need to fully understand the intrinsic (or single copy) photophysics of a nanocrystal.  In particular, in cases where the photoluminescence signatures are partially attributed to trap or defect states, ensemble PL linewidths no longer report on easily controllable synthetic parameters (e.g. size distribution).  We present recent measurments of intrinsic nanocrystal linewidths of NIR and IR emitting PbS and CuInS<sub>2 </sub>QDs, measured using solution photon correlation Fourier spectroscopy (S-PCFS).  S-PCFS results demonstrate the effect of heterogeneous traps and defects in governing single molecule linewidths, with broad implications to nanocrystal synthetic preparations and device photophysics.

Understanding and manipulating quantum dot photoluminescence lineshapes: Traps, defects and surface states

254th National Meeting (2017)

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