Ultrafast Formation of Nonemissive Species via Intermolecular Interaction in Single Crystals of Conjugated Molecules
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We investigate the influence of interchain interactions on the photoluminescence processes in a sexithiophene single crystal by applying hydrostatic pressure. We perform transient photoluminescence spectroscopy in the time domain of 100 fs for pressures up to 60 kbar. The combined use of steady-state and time-resolved optical spectroscopies allows us to show that the pressure-induced quenching of the photoluminescence is caused by an ultrafast ( 100 fs) formation of intermolecular species.
Phys. Rev. Lett. 86, 732-735 (2001)