Ultrafast photoexcitation dynamics behavior of hydrogen-bonded polyfluorenol  

作　　者：Man Xu Chuanxin Wei Yunlong Zhang Hao Li Jingyao Ma Jinyi Lin Shengjie Wang Wei Xue Qi Wei Linghai Xie Wei Huang 

机构地区：[1]State Key Laboratory of Organic Electronics and Information Displays&School of Chemistry and Life Sciences&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing 210023,China [2]Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM),Nanjing Tech University(NanjingTech),Nanjing 211816,China [3]Frontiers Science Center for Flexible Electronics(FSCFE),Shaanxi Institute of Flexible Electronics(SIFE)&Shaanxi Institute of Biomedical Materials and Engineering(SIBME),Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Chinese Chemical Letters》2024年第1期486-491,共6页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.22105099,61874053);Natural Science Foundation of Jiangsu Province(No.BK20200700);the open research fund from Anhui Province Key Laboratory of Optoelectronic Materials Science and Technology(No.OMST202101).

摘　　要：Exciton behavior is crucial to the exploitation of light-emitting conjugated polymer(LCPs)for optoelectronic devices.Singlet excitons are easily trapped by the intrinsically defect structures.Herein,we set a polyfluorenol(PPFOH)as an example to systematically investigate its photophysical behavior to check the role of defect structures in LCPs.According to time-resolved photoluminescence analysis,the feature emission peaks from individual chain of PPFOH in diluted DMF solution is effectively avoided the influence of fluorenone formation,but the residual green-band emission at 550nm is easily observed in the PL spectra of PPFOH dilute toluene solution obtained delay 1.5 ns,confirmed the formation of“guest”physical aggregation-induced defect structure.Remarkably,efficient and ultrafast energy transfer from individual chain to defect structure is observed in PPFOH films.Interestingly,the efficient energy transfer happened for the film obtained from DMF solution(200 ps)than those of toluene ones(600 ps).Meanwhile,compared to relatively stable green-band emission in PPFOH film from toluene solution,red-shifted emission peak(11 nm)of PPFOH film from DMF solutions exposed to saturated DNT vapor also confirmed their different aggregation-induced green-band emission.Therefore,this aggregation defect structures are influenced on the photophysical property of LCPs in solid states.

关 键 词：Photoexcitation dynamics Polyfluorenol Aggregation behavior Energy transfer Exciton migration 

分 类 号：O631.3[理学—高分子化学]