Synthesis and light‐emitting properties of a novel π‐conjugated poly[di(p‐phenyleneethynylene)‐alt‐ (p‐phenylenecyanovinylene)] containing n‐octyloxy side branches |
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| Authors: | Jun Ho Chi Chang‐Lyoul Lee Jang‐Joo Kim Jin Chul Jung |
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| Affiliation: | 1. PC Group, Chemical R&D Center, Cheil Industries Inc., Gocheon‐dong, Uiwang‐Si, Gyeonggi‐Do, 437–711, Korea;2. Optoelectronics Group, Cavendish Laboratory, Cambridge University, United Kingdom;3. Optical Materials and Device Laboratory, Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 500‐712, Korea;4. School of Materials Science and Engineering, Seoul National University, Seoul 151‐744, Korea |
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| Abstract: | A novel π‐conjugated poly[di(p‐phenyleneethynylene)‐alt‐(p‐phenylenecyanovinylene)] having n‐octyloxy side chains (PPE‐C8PPE‐PPV) was prepared by polymerization of the monomer DEDB with BCN. Chemical structure of the polymer obtained was confirmed by 1H NMR, FTIR, and EA. PPE‐C8PPE‐PPV had a molecular weight enough to fabricate the electroluminescent (EL) device, and showed a good organosolubility, excellent thermal stability, and film‐forming property. In UV absorption and PL spectra in film it showed a maximum at 430 and 543 nm, respectively, which appeared 5 and 41 nm longer wavelengths than that of the solution, respectively. HOMO, LUMO energy levels and band gap were determined to be ?5.70, ?3.29, and 2.41 eV, respectively. Two EL devices with low‐work function cathodes were fabricated with the structures of ITO/PEDOT/PPE‐C8PPE‐PPV/cathodes (LiF/Al and Mg:Ag/Ag). The both devices exhibited a bright green light emission at 545 nm and the maximum luminescence of 197 cd/cm2 (LiF/Al) and 158 cd/cm2 (Mg:Ag/Ag). © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 |
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| Keywords: | poly(p‐phenyleneethynylenecyanovinylene)] poly(p‐phenylenecyanovinylene) poly[di(p‐phenyleneethynylene)‐alt‐(p‐phenylene‐1‐cyanovinylene)] electroluminescent poly(p‐phenyleneethynylenecyanovinylene) light‐emit‐ting polymer |
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