Aggregation-induced delayed electrochemiluminescence of organic dots in aqueous media  

作　　者：Hang Gao Shen-Yu Shi Shu-MinWang Qian-Qian Tao Hui-Li Ma Jun Hu Hong-Yuan Chen Jing-Juan Xu 

机构地区：[1]State Key Laboratory of Analytical Chemistry for Life Science,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing,China [2]Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM),Nanjing Tech University,Nanjing,China [3]School of Life Science and Health Engineering,Jiangnan University,Wuxi,China

出　　处：《Aggregate》2024年第1期167-174,共8页聚集体（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:22034003,22204075,22275085;Natural Science Foundation of Jiangsu Province,Grant/Award Number:BK20220769;Excellent Research Program of Nanjing University,Grant/Award Number:ZYJH004;State Key Laboratory of Analytical Chemistry for Life Science,Grant/Award Number:5431ZZXM2203。

摘　　要：Full utilization of the excited species at both singlet states(1R*)and triplet states(3R*)is crucial to improving electrochemiluminescence(ECL)efficiency but is challenging for organic luminescent materials.Here,an aggregation-induced delayed ECL(AIDECL)active organic dot(OD)containing a benzophenone acceptor and dimethylacridine donor is reported,which shows high ECL efficiency via reverse intersystem crossing(RISC)of non-emissive 3R*to emissive 1R*,overcoming the spin-forbidden radiative decay from 3R*.By introducing dual donor-acceptor pairs into luminophores,it is found that nonradiative pathway could be further suppressed via enhanced intermolecular weak interactions,and multiple spin-up conversion channels could be activated.As a consequence,the obtained OD enjoys a 6.8-fold higher ECL efficiency relative to the control AIDECL-active OD.Single-crystal studies and theoretical calculations reveal that the enhanced AIDECL behaviors come from the acceleration of both radiative transition and RISC.This work represents a major step towards purely organic,high-efficiency ECL dyes and a direction for the design of next-generation ECL dyes at the molecular level.

关 键 词：aggregation-induced delayed electrochemiluminescence BENZOPHENONE dimethylacridine organic dots reverse intersystem crossing 

分 类 号：O62[理学—有机化学]