Dynamic Mechanism of Relaxation Paths Occurring in TPA-DCPP： Roles of Solvent and Temperature

作     者：ZHONG Qiulin CHEN Ying WANG Yinghui CHI Xiaochun WANG Yue NI Moueui ZHANG Hanzhuang 

作者机构：Key Laboratory of Physics and Technology for Advanced Batteries Ministry of Education College of Physics Jilin University Changchun 130012 P. R. China State Key Laboratory of Supramoleeular Structure and Materials Jilin University Changehun 130012 R R. China Department of Chemistry University of California at Irvine California 92697-2025 USA 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2017年第33卷第3期

页      面：400-405页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.51502109  21573094  11274142  11474131)  the Science and Technology Projects in the 13th Five-year Plan in the Education Department of Jilin Province  China(No.2016-402)  the National Fund for Fostering Talents of Basic Science  China(No.J1103202) and the Chinese Scholarship Council for Providing Financial Support During Visiting University of California at Irvine  USA 

主　　题：Transient absorption spectroscopy Ultrafast dynamics Temperature-dependent Polarity-dependent Intramolecular charge transfer state 

摘      要：The relaxation paths for triphenylamine（TPA）-2,3-dicyanopyrazino phenanthrene（DCPP）, which has a pull-push structure, were investigated via steady-state, time-resolved spectroscopy involving transient absorption and time-correlated single photon counting. By changing the solvent polarity we found that an intramolecular charge transfer（ICT） state acting as a ＂bright＂ state was responsible for the fluorescence character of TPA-DCPP. Meanwhile, a ＂dark＂ state gradually appeared and competed with the ICT state. This was likely to be responsible for the polarity-dependent evolution of fluorescence intensity and fluorescence lifetime. The temperature-dependent fluorescence character of the TPA-DCPP in toluene exhibited ICT processes at high temperatures prior to the relaxation path from the initial excited state to the ground state. Our results provide useful insight into the optoelectronic properties of these kinds of molecules.