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Acceptor side-chain effects on the excited state dynamics of two-dimensional-like conjugated copolymers in solution

Huo, Ming-Ming; Hu, Rong; Yan, Wei; Wang, Yi-Tong; Chee, Kuan; Wang, Yong; Zhang, Jian-Ping


Ming-Ming Huo

Rong Hu

Wei Yan

Yi-Tong Wang

Kuan Chee

Yong Wang

Jian-Ping Zhang


Excited 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).


Huo, M., Hu, R., Yan, W., Wang, Y., Chee, K., Wang, Y., & Zhang, J. (2017). Acceptor side-chain effects on the excited state dynamics of two-dimensional-like conjugated copolymers in solution. Molecules, 22(9), Article 1398.

Journal Article Type Article
Acceptance Date Aug 18, 2017
Publication Date Aug 25, 2017
Deposit Date Feb 7, 2018
Publicly Available Date Feb 7, 2018
Journal Molecules
Electronic ISSN 1420-3049
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 22
Issue 9
Article Number 1398
Keywords two-dimensional like conjugated copolymers; acceptor side-chain; transient absorption spectrum; intramolecular charge-transfer characters; excited state dynamics
Public URL
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