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16 December 1998 Linear, macrocyclic, and hyperbranched polymers for electroluminescent applications
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We report a series of polymers with linear, macrocyclic and hyperbranched structures for electroluminescent (EL) applications. The polymers are polycarbazoles (PC) containing different substituents. The polymers are amorphous and are soluble in common organic solvents such as chloroform, and tetrahydrofuran (THF). High optical quality films were obtained by spin-coating from the polymer solutions of chloroform or THF. All these polymers show strong photoluminescence under a UV-lamp illumination. Single and bilayer EL devices consisting of anode/hole transfer layer/electron transfer layer/cathode have been fabricated and characterized. The effects of polymer structures on the energy levels and EL properties are discussed. The results indicated that macrocyclic oligomers and hyperbranched polymers are new candidates for EL devices.
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Xu Tang Tao, Yadong Zhang, Shinichiro Maruyama, Tatsuo Wada, Hiroyuki Sasabe, H. Suzuki, Tetsuya Watanabe, and Seizo Miyata "Linear, macrocyclic, and hyperbranched polymers for electroluminescent applications", Proc. SPIE 3476, Organic Light-Emitting Materials and Devices II, (16 December 1998);

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