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Theoretical and Experimental Studies on Photophysical Characteristics of Low Bandgap Polymers |
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| Authors: | SUI Ning HUANG Tianhao WANG Yinghui ZHANG Hanzhuang |
| Institution: | 1. Femtosecond Laser Laboratory, College of Physics, Jilin University, Changchun 130012, P. R. China; 2. Department of Science, Zhijiang College of Zhejiang University of Technology, Hangzhou 310024, P. R. China; 3. State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, P. R. China |
| Abstract: | The basic photophysical characteristics of low bandgap polymer poly{2,7'-9,9-dioctylfluorene-alt-5-diethylhexyl-3,6-bis(5-bromothiophen-2-yl)pyrrolo3,4-c]pyrrole-1,4-dione}(PDPP-F) have been systematically investigated by means of theoretical and experimental methods. The quantum chemical calculations clarify the molecular structure and electronic transition properties of PDPP-F. The transient absorption data were used to compare the relaxation dynamics of PDPP-F in chlorobenzene and solid film. It is observed that the dynamics process of simulated emission relaxes much faster in comparison with that of excited state absorption in both the solution and solid film. Moreover, the excitation intensity-dependent dynamics of PDPP-F confirms that the interaction among intrachain excitons may occur under photoexcitation in the solution and solid film. |
| Keywords: | Polymer Narrow band Transient absorption |
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