Jaemin Lee, Byung-Jun Jung, Sang Kyu Lee, Jeong-Ik Lee, Hoon-Je Cho and Hong-Ku Shim
Two novel alternating polymers based on fluorene and electron-withdrawing bithiazole, poly[(4,4′-dihexyl-2,2′-bithiazole-5,5′-diyl)-alt-(9,9-dioctylfluorene-2,7-diyl)] (PHBTzF) and poly[(5,5′-bis(2″-thienyl)-4,4′-dihexyl-2,2′-bithiazole-5″,5″-diyl)-alt-(9,9-dioctylfluorene-2,7-diyl)] (PTHBTzTF), were synthesized by Suzuki polymerization. The physical and optical properties of the polymers were carefully characterized. The addition of bithiazole to the polymers' main chain not only reduced the lowest unoccupied molecular orbital energy levels of the polymers but also improved their n-doping stability. Polymeric light-emitting-diode devices and organic solar-cell devices with the polymers as active layers showed the potential of these kinds of materials for use in organic electronic devices.