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Understanding colloidal quantum dot excitation with solution photon correlation fourier spectroscopy

Colloidal quantum dots (CQDs) have useful absorption
and emission properties but exist in inhomogenous batches. Solution
photon correlation fourier spectroscopy (S-PCFS) combines
interferometry with fluorescence correlation spectroscopy (FCS) to
measure the spectral correlation of the average single fluorophore
in a solution. With S-PCFS, the intrinsic emission linewidth of
CQDs can be assessed. This linewidth information is related to
phonon coupling and gives insight into the separation of holes and
electrons in excited CQDs. Experimental considerations and
recommendations for troubleshooting a S-PCFS apparatus are also
presented here.