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Intermolecular electronic coupling of 9-methyl-9 H -dibenzo[ a ,[ c ] carbazole for strong emission in aggregated state by substituent effect
Science China Chemistry ( IF 9.6 ) Pub Date : 2020-08-13 , DOI: 10.1007/s11426-020-9814-7
Fan Liu , Qiuyan Liao , Jinfeng Wang , Yanbing Gong , Qianxi Dang , Weidong Ling , Mengmeng Han , Qianqian Li , Zhen Li

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.



中文翻译:

9-甲基-9 H-二苯并[a,[c]咔唑的分子间电子偶联通过取代效应以聚集态强发射

聚集态的有机发光剂的明亮发射因其在光电设备和生物/化学传感器中的潜在应用而受到越来越多的关注。在本文中,在将不同的取代基(Br,Ph和TPh)引入9-甲基-9 H-二苯并[ ac]咔唑(DBC)部分,生成的发光剂在固态时的PL量子产率为4.81%至47.39%。通过对分子堆积的系统研究和理论计算,证明了二聚体中强分子间电子耦合是固态发光的主要因素。研究结果为研究分子结构,堆积方式和发射性质之间的内在联系提供了新途径。

更新日期:2020-08-17
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