Synthesis and characterization of novel poly(p‐phenylenevinylene) derivatives containing phenothiazine‐5‐oxide and phenothiazine‐5, 5‐dioxide moieties |
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| Authors: | L. Y. Yang C. Wang L. Q. Li S. Janietz A. Wedel Y. L. Hua S. G. Yin |
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| Affiliation: | 1. The Institute of Material Physics, Tianjin University of Technology, Tianjin 300384, People's Republic of China;2. Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin 300384, People's Republic of China;3. Fraunhofer Institute of Applied Polymer Research, Geiselbergstrasse 69, D‐14476 Golm, Germany;4. Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin 300384, People's Republic of ChinaThe Institute of Material Physics, Tianjin University of Technology, Tianjin 300384, People's Republic of China |
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| Abstract: | PPV‐based copolymers containing phenothiazine‐5‐oxide and phenothiazine‐5, 5‐dioxide moieties have been successfully synthesized by Wittig‐Horner reaction and characterized by means of UV‐vis, photoluminescence, electroluminescence spectra, and cyclic voltammetry. All of these copolymers can be dissolved in common organic solvents such as chloroform, tetrahydrofuran, and toluene. The PL maxima in the film state are located at 582, 556, and 552 nm for P1, P2, and P3, respectively. The HOMO and LUMO levels of P2 are found to be ?5.21 and ?2.68 eV, respectively; whereas those of P3 are found to be ?5.26 and ?2.71 eV, respectively. The cyclic voltammetry result indicates that the conversion of electron‐donating sulfide to electron‐withdrawing sulfoxide or sulfone group in polymers plays a dominating role in increasing its oxidation potential. Yellowish‐green light ranging from 568 to 540 nm was observed for the single layer device with the configuration of ITO/Polymer/Ca/Al. Double layer devices with Zn (BTZ)2 as a hole blocking layer exhibited enhanced EL performance compared to the single layer devices. The maximum brightness of the double layer devices of P1, P2, and P3 is 278, 400, and 796 cd/m2, respectively. The results of EL and electrochemical analyses revealed that they are promising candidate materials for organic, light‐emitting diodes with hole‐transporting ability. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4291–4299, 2007 |
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| Keywords: | conjugated polymers cyclic voltammetry electrochemistry electroluminescence light‐emitting diodes phenothiazine |
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