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• W2334825874 abstract "Broadband femtosecond transient absorption spectroscopy is used to explore the mechanisms underlying excited-state and ground-state exciton relaxation in poly(3-hexylthiophene) (P3HT) solution. We focus on the picosecond spectral shifts in the ground and excited states of P3HT, using pump–probe (PP) and pump–dump–probe (PDP) techniques to investigate exciton relaxation mechanisms. Excited-state PP signals resolved a dynamic stimulated emission Stokes shift and ground-state reorganization; PDP signals resolved a blue-shifting nonequilibrium ground-state bleach. Initial structural reorganization is shown to be faster in the excited state. Ground-state reorganization is shown to be dependent on dump time, with later times resulting in relatively more population undergoing slow (∼20 ps) reorganization. These observations are discussed in the context of structural relaxation involving small-scale (<1 ps) and large-scale (>1 ps) planarization of thiophene groups following photoexcitation. Excited-state and ground-state dynamics are contrasted in terms of electronic structure defining the torsional potential energy surfaces. It is shown that the primary excitonic relaxation mechanism is excited-state self-trapping via torsional relaxation rather than exciton energy transfer." @default.
• W2334825874 created "2016-06-24" @default.
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• W2334825874 date "2011-10-20" @default.
• W2334825874 modified "2023-10-18" @default.
• W2334825874 title "Excited-State Self-Trapping and Ground-State Relaxation Dynamics in Poly(3-hexylthiophene) Resolved with Broadband Pump–Dump–Probe Spectroscopy" @default.
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• W2334825874 doi "https://doi.org/10.1021/jz201168q" @default.
• W2334825874 hasPublicationYear "2011" @default.
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