期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 43, 期 7, 页码 1417-1431出版社
WILEY
DOI: 10.1002/pola.20578
关键词
conjugated polymers; copolymerization; donor-acceptor polymers; near-infrared emission; polymer light-emitting diodes (PLEDs); photophysics; pyridopyrazines
We report a comparative study of two organic soluble, vinylene-based, alternating donor-acceptor copolymers with 1,4-(2,5-dihexadecyloxyphenylene) as the donor; the acceptor is either a 2,5-linked pyridine or a 5,8-linked 2,3-diphenylpyrido[3,4-b]pyrazine. The polymers are synthesized via a Heck coupling methodology from a dihalo monomer and a divinyl monomer to yield number-average molecular weights of 16,000 g/mol for the pyridine polymer (PPyrPV) and 6500 g/mol for the pyridopyrazine polymer (PPyrPyrPV), with high solubility in common chlorinated solvents and lower solubility in less polar solvents (e.g., tetrahydrofuran). Thin-film measurements show band gaps of 2.2 and 1.8 eV for PPyrPV and PPyrPyrPV, respectively. Both polymers exhibit photoluminescence in solution and in the solid state and exhibit electroluminescence when incorporated into light-emitting diodes. In this case, a broad red emission centered at 690 nm for PPyrPV and a near-infrared emission centered at 800 nm for PPyrPyrPV have been observed. (c) 2005 Wiley Periodicals, Inc.
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