Premium
Light‐emitting alternating copolymers and their intramolecular charge transfer state
Author(s) -
Lin Hongzhen,
Yang Junlin,
Zheng Min,
He Qingguo,
Huang Hongmin,
Bai Fenglian
Publication year - 2003
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.311
Subject(s) - intramolecular force , copolymer , materials science , photochemistry , fluorescence , carbazole , conjugated system , polymer , fluorescence spectroscopy , polymer chemistry , alkyl , absorption spectroscopy , chemistry , organic chemistry , physics , quantum mechanics , composite material
Two light‐emitting conjugated polymers alternatively involving arylenevinylene and a N‐alkyl carbazole moieties in the main chain were investigated. The formation of an intramolecular charge transfer state was probed within the repetition units of the copolymers. A tail absorption band and dual fluorescence were found for one of the copolymers, poly[(9‐(2‐ethyl‐hexyl)‐9H‐carbazol‐3,6‐ylene)‐alt‐(anthracen‐9,10‐ylene) vinylene], Cz‐PAV. Solvent polarity effects were studied by means of steady‐state spectroscopy and fluorescence‐lifetime measurements. Fluorescence emission spectra at 77 K were also explored. All the results show that a photoinduced intramolecular charge transfer state was formed in Cz‐PAV. The formation of this state may be related to the electron affinity of the acceptor group contained in the copolymer and to the molecular conformation of the copolymer. Copyright © 2003 John Wiley & Sons, Ltd.