The formation of supramolecular liquid-crystal gels for enhancing the electro-optical properties of twisted nematic liquid crystals |
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| Affiliation: | 1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China;2. Department of Physics, Jining University, Qufu 273155, PR China;1. Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China;2. Department of Information Engineering, Gannan Medical University, Ganzhou, Jiangxi 341000, China;1. Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan;2. Institute of Ultra High Frequency Semiconductor Electronics of RAS, Moscow 117105, Russia;3. Center for Photonics and Infrared Engineering, Bauman Moscow State Technical University, Moscow 111005, Russia;4. Department of Computer Science and Engineering, University of Aizu, Aizu-Wakamatsu 965-8580, Japan;5. Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA |
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| Abstract: | We report that the supramolecular liquid-crystal (LC) physical gel can be formed through the fibrous self-assembly of the polyfluorene-based π-conjugated polymer, poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT), in twisted nematic LC system for the first time. With the utility of alignment layers, the F8BT molecules can be aligned and formed the LC physical gels with the formation of self-assembled supramolecular structures in the twisted nematic LCs. In contrast to conventional LC physical gels, the presence of anisotropic π-conjugated structure makes the twisted nematic LC system exhibit excellent electro-optical properties of driving voltage reduction and contrast ratio enhancement owing to the conjugated polymer having a high π-electron delocalization degree which can efficiently drive LC molecules in much lower operating voltages. The self-assembled supramolecular network has revealed the potential for applying in various LC display devices with the ability of improving their electro-optical performance. |
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| Keywords: | Liquid crystal physical gel Electro-optical device π-Conjugated gelator Self-assembled supramolecular structure |
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