Highly Fluorescent Semiconducting Two-Dimensional Conjugated Polymer Films Achieved by Side-Chain Engineering Showing Large Exciton Diffusion Length

查看全文 作　　者：Yongshuai [1,2]Wang;Qing [3,4]Zhang;Xiao-Ze [5]Li;Zhibin [1]Shu;Yihan [1,2]Zhang;Can [1]Gao;Yang [1]Li;Hao [1]Liu;Chenguang [1]Li;Hong-Hua [5]Fang;Hong-Bo [5]Sun;Xiaotao [6]Zhang;Wenping [3,6]Hu;Huanli [1,2]Dong

机构地区：[1]Beijing National Laboratory for Molecular Sciences,Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190;[2]University of Chinese Academy of Sciences,Beijing 100190;[3]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207;[4]Department of Chemistry,National University of Singapore,Singapore 117543;[5]State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instrument,Tsinghua University,Beijing 100084;[6]Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Department of Chemistry,School of Science,Tianjin University,Tianjin 300072

出　　处：《CCS Chemistry》索引2023年第5卷第10期,共12页

基　　金：supported by the Ministry of Science and Technology of China(grant nos.2018YFA0703200 and 2022YFB3603800);the Natural Science Foundation of China(grant nos.21875259,52233010,51725304,61890943,and 22021002);the CAS Project for Young Scientists in Basic Research(grant no.YSBR-053);the Youth Innovation Promotion Association of the Chinese Academy of Sciences,the National Program for Support of Top-notch Young Professionals,the Beijing National Laboratory for Molecular Sciences(grant no.BNLMS-CXXM-202012);the Key Research Program of the Chinese Academy of Sciences(grant no.XDPB13);K.C.Wong Education Foundation(grant no.GJTD-2020-02). 摘　　要：Semiconducting two-dimensional conjugated polymers(2DCPs)with strong fluorescence emission have great potential for various optoelectronic applications.However,it is enormously challenging to achieve this goal due to the significant compact interlayerπ-πstacking-induced quenching effect in these systems.In this work,we found that highly fluorescent semiconducting 2DCPs can be prepared through an effective side-chain engineering approach in which interlayer spacers are introduced to reduce the fluorescence quenching effect.The obtained two truxene-based 2DCP films that,along with-C6H13 and-C_(12)H_(25)alkyl side chains as interlayer spacers both demonstrate superior fluorescence properties with a high photoluminescence quantum yield of 5.6%and 14.6%,respectively.These are among the highest values currently reported for 2DCP films.Moreover,an ultralong isotropic quasi-twodimensional exciton diffusion length constrained in the plane with its highest value approaching 110 nm was revealed by the transient photoluminescence microscopy technique,suggesting that theπ-conjugated structure in these truxene-based 2DCP films has effectively been extended.This work can enable a broad exploration of highly fluorescent semiconducting 2DCP films for more deeply fundamental properties and optoelectronic device applications. 关键词：two-dimensional conjugated polymer side-chain engineering enlarged interlayer distance strong fluorescence emission large exciton diffusion length

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Highly Fluorescent Semiconducting Two-Dimensional Conjugated Polymer Films Achieved by Side-Chain Engineering Showing Large Exciton Diffusion Length

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