Molecular aggregates in conjugated polymer（CP） solution can propagate into mesoscale morphology of the relevant film and further dominate the optoelectronic property. Herein, we probed the aggregation behavior of p...Molecular aggregates in conjugated polymer（CP） solution can propagate into mesoscale morphology of the relevant film and further dominate the optoelectronic property. Herein, we probed the aggregation behavior of poly（9,9-dioctylfluorene-2,7-diyl）（PFO） and studied its influence on the photophysical property in 1,2-dichloroethane（DCE） solution, where the contents of β-phase or-aggregates increased with prolonged aging time. Thereinto, high quality β-film was fabricated from DCE solution with critical aggregate time of 6 min. The film exhibited excellent surface morphology and characteristic emission of β-phase. Meanwhile, films prepared from aged DCE solutions exhibited high crystallinity, which was promising to obtain higher photoluminance efficiency and charge transport ability simultaneously. Therefore, it is significant to get deep insight into the aggregation behavior of CP, which is involved not only with the solution-processing technology of plastic device, but also with the optoelectronic property of CP.展开更多
Dodecyl β-naphthoate and 3-octadecyl pyrene were used as fluorescence probes for estimation of microscopic polarity in aggregates formed by long chain hydrocarbon C_n(n=10,12, 14,16,18)in dimethyl sulfoxide-water mix...Dodecyl β-naphthoate and 3-octadecyl pyrene were used as fluorescence probes for estimation of microscopic polarity in aggregates formed by long chain hydrocarbon C_n(n=10,12, 14,16,18)in dimethyl sulfoxide-water mixed solvent.The polarity in the aggregates is similar to that in cyclohexane.The average aggregation number(N)was determined by using time resolved fluorescence technique.N is dependent on substrate chain length and varies from 15 to 30.The microviscosity was also measured by fluorescence depolarization method.Above phase transition temperature,the microviscosity in aggregates is slightly larger than that in micelle,but below this temperature,the microviscosity in aggregates is as large as that in solid phase.展开更多
基金financially supported by the National Key Basic Research Program of China(973)(No.2015CB932200)the National Natural Science Funds for Excellent Young Scholar(No.21322402)+6 种基金the National Natural Science Foundation of China(Nos.21504041,21274064 and 61475074)University of Jiangsu Province Natural Science Foundation Project(No.14KJB510027)Natural Science of the Education Committee of Jiangsu Province(No.15KJB430019)Jiangsu Planned Projects for Postdoctoral Research Funds(No.1501019B)China Postdoctoral Science Foundation(No.2015M580419)SICAM Fellowship,Imperial College LondonOpen Project from State Key Laboratory of Supramolecular Structure and Materials at Jilin University(No.sklssm201612)
文摘Molecular aggregates in conjugated polymer（CP） solution can propagate into mesoscale morphology of the relevant film and further dominate the optoelectronic property. Herein, we probed the aggregation behavior of poly（9,9-dioctylfluorene-2,7-diyl）（PFO） and studied its influence on the photophysical property in 1,2-dichloroethane（DCE） solution, where the contents of β-phase or-aggregates increased with prolonged aging time. Thereinto, high quality β-film was fabricated from DCE solution with critical aggregate time of 6 min. The film exhibited excellent surface morphology and characteristic emission of β-phase. Meanwhile, films prepared from aged DCE solutions exhibited high crystallinity, which was promising to obtain higher photoluminance efficiency and charge transport ability simultaneously. Therefore, it is significant to get deep insight into the aggregation behavior of CP, which is involved not only with the solution-processing technology of plastic device, but also with the optoelectronic property of CP.
文摘Dodecyl β-naphthoate and 3-octadecyl pyrene were used as fluorescence probes for estimation of microscopic polarity in aggregates formed by long chain hydrocarbon C_n(n=10,12, 14,16,18)in dimethyl sulfoxide-water mixed solvent.The polarity in the aggregates is similar to that in cyclohexane.The average aggregation number(N)was determined by using time resolved fluorescence technique.N is dependent on substrate chain length and varies from 15 to 30.The microviscosity was also measured by fluorescence depolarization method.Above phase transition temperature,the microviscosity in aggregates is slightly larger than that in micelle,but below this temperature,the microviscosity in aggregates is as large as that in solid phase.
