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8 December 2003 Photorefractive properties of conjugated carbazole polymers
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We discussed the electric and optical properties of three types of conjugated carbazole polymers: substituted polyacetylene with carbzole moiety, main-chain polymers having conjugated carbazole trimer units, and triindole units. Substituted polyacetylenes can be expected to show the enhanced optoelectronic responses due to the extended conjugated systems in the main chain and the additional chromophores in the side chain. The hole mobility of a substituted polyacetylene containing carbazole moiety was determined to be about 10-4 cm2/Vs with the electric field of 4 x 105 V/cm by time-of-flight technique, while polyvinylcarbazole showed hole mobility of about 10-6 cm2/Vs. The carrier mobility is presumably enhanced by the extended conjugation system. Hyperbranched polymers with carbazole trimer units exhibited the enhanced two beam coupling gain of 60 cm-1 in comparison with main-chain polymer with carbazole units. Since triindole is an electron-donative molecule containing three carbazole substructures with smaller ionization energy than that of carbazole, we can expect the application to a variety of optical and electrical materials. Main-chain polymers with triindole units exhibited the two-beam coupling gain of over 100 cm-1. Therefore, theses conjugated carbazole polymers are one of the good candidates for the new class of electronic and photonic materials.
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Tetsuya Aoyama, Takafumi Sassa, Nicolai Mooren, Yoshihiro Imase, Atsushi Gunji, Takeyuki Sone, Masayoshi Tabata, Takashi Okubo, Tadaoki Mitani, and Tatsuo Wada "Photorefractive properties of conjugated carbazole polymers", Proc. SPIE 5216, Organic Holographic Materials and Applications, (8 December 2003);

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