首页|Ultrafast photoexcitation dynamics behavior of hydrogen-bonded polyfluorenol
Ultrafast photoexcitation dynamics behavior of hydrogen-bonded polyfluorenol
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Exciton behavior is crucial to the exploitation of light-emitting conjugated polymer(LCPs)for optoelec-tronic 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 influ-ence of fluorenone formation,but the residual green-band emission at 550 nm 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 in-dividual chain to defect structure is observed in PPFOH films.Interestingly,the efficient energy transfer happened for the film obtained from DMF solution(200ps)than those of toluene ones(600ps).Mean-while,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.
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
Key Laboratory of Flexible Electronics(KLOFE)& Institute of Advanced Materials(IAM),Nanjing Tech University(NanjingTech),Nanjing 211816,China
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
Frontiers Science Center for Flexible Electronics(FSCFE),Shaanxi Institute of Flexible Electronics(SIFE)& Shaanxi Institute of Biomedical Materials and
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国家自然科学基金国家自然科学基金江苏省自然科学基金open research fund from Anhui Province Key Laboratory of Optoelectronic Materials Science and Technology
NETL
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