Effects of Plasmonic and Semiconductor Nanocrystals on the Exciton Dynamics of the Conjugated Polymer Aggregate
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We investigated the excited-state dynamics of a ternary hybrid system composed of a conjugated polymer (CP) and plasmonic and semiconductor nanocrystals using femtosecond transient absorption spectroscopy. The CP photoluminescence (PL) intensity in the ternary system increased compared to that in the neat system; the quenching of CP excitions to the nanocrystals in the ternary system occurred rarely. Particularly, to elucidate the PL enhancement mechanism, we focused on the formation dynamics of CP polaron-pair states from non-relaxed singlet excitons. Our findings in this study may provide important information that can be used to improve the efficiencies of CP-based optoelectronic devices.