Molecular Crystals and Liquid Crystals p. 159 - 167 (2007)
Update date:2022-08-03
Topics:
Siemssen, Brent
Kim, Ki-Won
Kim, Min-Sook
Kim, Byung-Soo
Cho, Seong-Jin
Park, Dong-Kyu
Woo, Hyung-Suk
Kwon, Tae-Woo
The synthesis and photophysics of two new donor-acceptor conjugated A-B type copolymers based on conjugated 2,6-disubstitued-4-phenyl-quinoline and 2-substitued-4-phenyl-quinoline, and 9,9-dialkyl-fluorene linked through the 1,4 and 1,3,5 phenyl rings via the Friedlnder condensation and Suzuki coupling reaction are presented. The band gap energy of the polymers 1 and 2 measured from the thin films were 430nm and 380nm corresponding to 2.88eV and 3.26eV, respectively. The photoluminescence (PL) spectra of the thin films of the polymers 1 and 2 showed maximum peaks at 427 and 397nm corresponding to the deep blue and UV ranges respectively. The red shift of the polymer 1 relative to the polymer 2 can be accounted for by the increased conjugation length because the quinoline unit is oriented to include the phenyl ring in the backbone of polymer 1. Both polymers have similar trends of irreversible oxidation. The ionization energy of polymers 1 and 2 were measured by cyclic voltammetry (CV) and were found to be 5.60 and 5.65eV, respectively.
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