Molecular-level encapsulation of conjugated polymers serves as a potent approach to isolate the conjugated backbone for reducing intermolecular interactions and manipulating optoelectronic properties in solid state.He...Molecular-level encapsulation of conjugated polymers serves as a potent approach to isolate the conjugated backbone for reducing intermolecular interactions and manipulating optoelectronic properties in solid state.Herein,by tuning the generation of dendritic carbazoles(Cz)in side chains,polydiarylfluorenes with efficient deep-blue emission have been successfully synthesized and explored.The nonplanar twisted Cz dendrons endow their photoluminescence(PL)spectra with enhanced air-aging stability and thermal stability owing to the formation of a self-encapsulation layer.Their impact on solutionstate chain conformation and aggregation was thoroughly studied,combining small-angle neutron scattering(SANS)and dynamic light scattering(DLS).Furthermore,benefiting from the suppressed intermolecular interactions,their films exhibit optimal behavior of singlet excitons in the excited state.Polymer light-emitting diodes(PLEDs)adopting the spin-coated and blade-coated films both present comparable properties and stable electroluminescence(EL)spectra,with Commission Internationale de L'Eclairage(CIE)coordinates(x+y)<0.3,demonstrating the feasibility of a self-encapsulated molecular design strategy.展开更多
基金support from the National Natural Science Foundation of China(No.62205141,62105262,62288102,22075136,62405134)supported by the Natural Science Funds of the Education Committee of Jiangsu Province(No.23KJA430010)+5 种基金the Open Fund of the Key Labora-tory of Advanced Display and System Applications,Min-istry of Education,Shanghai University(OF202505)supported by the Natural Science Foundation of Jiangsu Province for Youth(No.BK20230342)supported by the China Postdoctoral Science Foundation(No.2024M753737)the Shenzhen Science and Tech-nology Program(No.RCBS20231211090610014)support from the Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX25-1710)The SANS experiments were performed on the small-angle neutron scattering instrument at the China Spallation Neutron Source(CSNS),Dongguan,China(Project ID:P0123122600014).
文摘Molecular-level encapsulation of conjugated polymers serves as a potent approach to isolate the conjugated backbone for reducing intermolecular interactions and manipulating optoelectronic properties in solid state.Herein,by tuning the generation of dendritic carbazoles(Cz)in side chains,polydiarylfluorenes with efficient deep-blue emission have been successfully synthesized and explored.The nonplanar twisted Cz dendrons endow their photoluminescence(PL)spectra with enhanced air-aging stability and thermal stability owing to the formation of a self-encapsulation layer.Their impact on solutionstate chain conformation and aggregation was thoroughly studied,combining small-angle neutron scattering(SANS)and dynamic light scattering(DLS).Furthermore,benefiting from the suppressed intermolecular interactions,their films exhibit optimal behavior of singlet excitons in the excited state.Polymer light-emitting diodes(PLEDs)adopting the spin-coated and blade-coated films both present comparable properties and stable electroluminescence(EL)spectra,with Commission Internationale de L'Eclairage(CIE)coordinates(x+y)<0.3,demonstrating the feasibility of a self-encapsulated molecular design strategy.
