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Alkyl-chain branched effect on the aggregation and photophysical behavior of polydiarylfluorenes toward stable deep-blue electroluminescence and efficient amplified spontaneous emission

查看全文 作　　者：Lili [1]Sun;Ning [1]Sun;Lubing [1,2,3]Bai;Xiang [1]An;Bin [4]Liu;Chen [5]Sun;Lixiang [2]Fan;Chuanxin [1]Wei;Yamin [1]Han;Mengna [2]Yu;Jinyi [1,3]Lin;Dan [4]Lu;Ning [1]Wang;Linghai [2]Xie;Kang [1]Shen;Xinwen [2]Zhang;Yanan [2]Xu;Juan Cabanillas-[5]Gonzalez;Wei [1,2,3]Huang 高影响力作者 机构地区：[1]Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM),Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing Tech University(NanjingTech),Nanjing 211816,China;[2]Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials(IAM),Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing University of Posts&Telecommunications,Nanjing 210023,China;[3]Shaanxi Institute of Flexible Electronics(SIFE),Northwestern Polytechnical University(NPU),Xi'an 710072,China;[4]State Key Laboratory of Supramolecular Structure and Materials,College of Chemistry,Jilin University,Changchun 130012,China;[5]Madrid Institute for Advanced Studies(IMDEA Nanociencia),Ciudad Universitaria de Cantoblanco,Calle Faraday 9,Madrid 28049,Spain高影响力机构 出　　处：《Chinese Chemical Letters》索引2019年第30卷第11期,共6页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Nos.61874053,21774061,91833306);Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions,PAPD(No.YX03002);the Six Peak Talents Foundation of Jiangsu Province(No.XCL-CXTD-009);Natural Science Funds of the Education Committee of Jiangsu Province(No.18KJA430009);'High-Level Talents in Six Industries'of Jiangsu Province(No.XYDXX-019);Program for Postgraduates Research Innovation in University of Jiangsu Province(No.KYCX17_0752);the open research fund from Key Laboratory for Organic Electronics and Information Display&and State Key Laboratory of Supramolecular Structure and Materials(No.sklssm2019017);Overseas Merit Foundation of Science and Technology of Nanjing;financial support from the Regional Government of Madrid through NMAT2D-CM Project(No.S2018/NMT-4511);the Spanish Ministry of Economy and Competitiveness through project RTI2018-097508-B-I00;through the Severo Ochoa Program for Centers of Excellence(No.SEV-2016-0686);the Campus of International Excellence(CEI)UAM+CSIC;the China Scholarship Council(No.201608390023)for a PhD sponsorship 摘　　要：The control of the condensed superstructure of light-emitting conjugated polymers(LCPs)is a crucial factor to obtain high performance and stable organic optoelectronic devices.Side-chain engineering strategy is an effective platform to tune inter chain aggregation and photophysical behaviour of LCPs.Herein,we systematically investigated the alkyl-chain branched effecton the conformational transition and photophysical behaviour of polydiarylfluorenes toward efficient blue optoelectronic devices.The branched side chain will improve materials solubility to inhibit interchain aggregation in solution according to DLS and optical analysis,which is useful to obtain high quality film.Therefore,our branched PEODPF,POYDPF pristine film present high luminance efficiency of 36.1%and 39.6%,enhanced about 20%relative to that of PODPF.Compared to the liner-type sides'chain,these branched chains also suppress chain planarization and improve film morphological stability effectively.Interestingly,the branched polymer also had excellent stable amplified spontaneous emission(ASE)behaviour with low threshold(4.72μJ/cm2)and a center peak of 465 nm,even thermal annealing at 220℃in the air atmosphere.Therefore,side-chain branched strategy for LCPs is an effective means to control interchain aggregation,film morphology and photophysical property of LCPs. 关 键 词：Light-emitting conjugated polymers Branched effect Aggregation behavior Robust deep-blue emission Efficient optoelectronic devices
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