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.
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(4.72 μJ/cm^2) and a center peak of 465 nm,even thermal annealing at 220 C 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.
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
