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Theoretical and Experimental Study of Photophysical Characteristics between Poly(9,9-dioctyl°uorene) and Poly(9,9-dioctyl°uorene-co-benzothiadiazole)
Li-quan Zhang,Ying-hui Wang*,Ning Sui,Zhi-hui Kang,Tian-hao Huang,Yu-guang Ma,Han-zhuang Zhang*
Author NameAffiliationE-mail
Li-quan Zhang Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, ChinaTeaching Center of Basic Courses, Heping Campus, Jilin University, Changchun 130062, China  
Ying-hui Wang* Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, ChinaState Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China wangyinghuijlu@yahoo.cn 
Ning Sui Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, China  
Zhi-hui Kang Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, China  
Tian-hao Huang Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, China  
Yu-guang Ma State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China  
Han-zhuang Zhang* Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, China zhanghz@jlu.edu.cn 
Abstract:
The photo-physical characteristics of semiconductor polymer are systematically stud-ied through comparing poly (9,9-dioctylfluorene) (PFO) and poly (9,9-dioctylfluorene-co-benzothiadiazole) (F8BT). The quantum chemical calculation shows that the introduction of benzothiadiazole unit facilitates the intrachain charge transfer (ICT) and modulates the electronic transition mechanism of polymer. The transient absorption measurement exhibits that intrachain exciton relaxation is dominant in the decay of excited PFO in a monodis-perse system and intrachain exciton interaction could appear at high excitation intensity. In F8BT solution, the ICT state exists and participates in the relaxation of excited state. The relaxation processes of PFO and F8BT in the condensed phase both accelerate and show obvious exciton-exciton annihilation behavior at high excitation intensity. At the same excitation intensity, the mean lifetime of F8BT is longer than that of PFO, which may be assigned to the excellent delocalization of charge.
Key words:  Conjugated polymer, Transient absorption spectroscopy, Intrachain charge transfer
FundProject:
聚(9,9-二辛基芴)和聚(9,9-二辛基芴-共-苯并噻二唑)的光物理特性的理论和实验研究
张里荃,王英惠*,隋宁,康智慧,黄田浩,马於光,张汉壮*
摘要:
通过比较分析聚(9,9-二辛基芴)(PFO)和聚(9,9-二辛基芴-共-苯并噻二唑)(F8BT),对半导体聚合物的光物理特性进行了系统研究. 量子化学计算显示,苯并噻二唑单元的引入促进了链内电荷转移(ICT),调节了聚合物的电子跃迁机制. 瞬态吸收测定表明,在单分散系统中的受激PFO衰减时主要表现为链内激子弛豫.在F8BT溶液中,ICT状态出现,并参与到激发态的弛豫过程中. 凝聚相中PFO和F8BT的弛豫过程加速和显示了在高激发强度下具有显著的激子湮灭行为. 在相同的激发强度下,F8BT的平均寿命长于PFO,有助于实现良好的电荷离域.
关键词:  共轭聚合物,瞬态吸收光谱,链内电荷转移
DOI:10.1063/1674-0068/26/04/387-392
分类号: