Intermolecular electronic coupling of 9-methyl-9H-dibenzo[a,c]carbazole for strong emission in aggregated state by substituent effect  

作　　者：Fan Liu Qiuyan Liao Jinfeng Wang Yanbing Gong Qianxi Dang Weidong Ling Mengmeng Han Qianqian Li Zhen Li 

机构地区：[1]Salvage Center for Molecular Sciences,Department of Chemistry,Wuhan University,Wuhan 430072,China [2]Institute of Molecular Aggregation Science,Tianjin University,Tianjin 300072,China

出　　处：《Science China Chemistry》2020年第10期1435-1442,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(51673151,51973162,21875174,21734007);the Natural Science Foundation of Hubei Province(2017CFA002)。

摘　　要：Bright emission of organic luminogens at aggregated state has attracted increasing attention for their potential applications in opto-electronic devices and bio-/chemo-sensors.In this article,upon the introduction of different substituents(Br,Ph and TPh)to the large conjugated core of 9-methyl-9H-dibenzo[a,c]carbazole(DBC)moiety,the resultant luminogens demonstrated PL quantum yields in solid state ranging from 4.81%to 47.39%.Through the systematic investigation of molecular packing,together with theory calculation,the strong intermolecular electronic coupling in the dimers is proved as the main factor to the bright emission in the solid state.The results afforded a new avenue to investigate the intrinsic relationship among the molecular structures,packing modes and emission properties.

关 键 词：PHOTOLUMINESCENCE substituent effect molecular packing electronic coupling 

分 类 号：TB34[一般工业技术—材料科学与工程]