Theoretical and Experimental Study of Photophysical Characteristics between Poly（9,9-dioctylfluorene） and Poly（9,9-dioctylfluorene-co-benzothiadiazole）  

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

作　　者：张里荃[1,3] 王英惠[1,2] 隋宁[1] 康智慧[1] 黄田浩[1] 马於光[2] 张汉壮[1] 

机构地区：[1]吉林大学物理学院飞秒激光实验室,长春130012 [2]吉林大学超分子结构和材料国家重点实验室,长春130012 [3]吉林大学和平校区公共教学中心,长春130012

出　　处：《Chinese Journal of Chemical Physics》2013年第4期387-392,J0001,共7页化学物理学报（英文）

摘　　要：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.

关 键 词：Conjugated polymer Transient absorption spectroscopy Intrachain chargetransfer 

分 类 号：O[理学]