Acceptor side-chain effects on the excited state dynamics of two-dimensional-like conjugated copolymers in solutionTools Huo, Ming-Ming, Hu, Rong, Yan, Wei, Wang, Yi-Tong, Chee, Kuan, Wang, Yong and Zhang, Jian-Ping (2017) Acceptor side-chain effects on the excited state dynamics of two-dimensional-like conjugated copolymers in solution. Molecules, 22 (9). 1398/1-1398/14. ISSN 1420-3049 Full text not available from this repository.
Official URL: http://www.mdpi.com/1420-3049/22/9/1398
AbstractExcited state dynamics of two-dimensional-like conjugated copolymers PFDCN and PFSDCN based on alternating fluorene and triphenylamine main chains and malononitrile pendant acceptor groups with thiophene as π-bridge, have been investigated by using transient absorption spectroscopy. There is an additional conjugated –C=C– bond in PFDCN, which distinguishes it from PFSDCN. The lowest energy absorption band of each copolymer absorption spectrum is attributed to the π−π* transition with intramolecular charge-transfer, which has a lower fluorescence contribution than those of higher energy absorption bands. The optical excitation of either PFDCN or PFSDCN solution generates polaron pairs that then self-localize and evolve to a bound singlet exciton within a few picoseconds. Due to the additional conjugated –C=C– bond in the acceptor side-chain, PFDCN has a stronger intramolecular charge-transfer characteristic compared with PFSDCN, therefore exhibiting a longer self-localization time (7 ps vs. 3 ps for PFSDCN) and a shorter fluorescence lifetime (1.48 ns vs. 1.60 ns for PFSDCN).
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