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Absorption spectrum of flexible conjugated polymers: the weak-disorder limit
Institution:1. National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan;2. National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan;3. IMRA JAPAN Co., Ltd., 2-36 Hachiken-cho, Kariya-shi, Aichi 448-8650, Japan;1. HKUST-Shenzhen Research Institute, No. 9 Yuexing 1st RD, Hi-tech Park, Nanshan, Shenzhen 518057, China;2. Department of Physics, North Carolina State University, Raleigh, NC 27695, USA;3. Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong;4. State Key Laboratory for Mechanical Behavior of Materials, Xi׳an Jiaotong University, Xi׳an, 710049, China;1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada;1. Department of Physics, Imperial College London, London SW7 2AZ, UK;2. Grantham Institute-Climate Change and the Environment, Imperial College London, SW7 2AZ, UK;3. Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;4. MeshPower Limited, London SW7 2AZ, UK;1. Department of Applied Physics, Lanzhou University of Technology, Lanzhou, Gansu, 730050, China;2. Department of Physics, Lanzhou City University, Lanzhou, Gansu, 730070, China;3. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu, 730050, China;4. College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, Gansu, 730070, China
Abstract:Purely conformational contributions to dipole transition moments lead to a general new expression for the absorption spectrum of flexible conjugated polymers with persistence length ξc and alternation δ. Blue-shifts are found at rod-to-coil transitions without invoking rotational defects that break the conjugation. Conformational coupling in the weak-disorder limit increases the effective alternation.
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