Aggregation-induced narrowband isomeric fluorophores for ultraviolet nondoped OLEDs by engineering multiple nonbonding interactions  

作　　者：Yumiao Huo Haoyuan Qi Shuyao He Jie Li Shuping Song Jichen Lv Yuchao Liu Ling Peng Shian Ying Shouke Yan 

机构地区：[1]Key Laboratory of Rubber-Plastics,Ministry of Education,School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao,P.R.China [2]College of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao,P.R.China [3]College of Chemistry and Chemical Engineering,Heze University,Heze,P.R.China [4]State Key Laboratory of Chemical Resource Engineering,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing,P.R.China

出　　处：《Aggregate》2023年第6期191-199,共9页聚集体（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:52002804,52103220,52103017,22022501;Shandong Provincial Natural Science Foundation,Grant/Award Numbers:ZR2023QE078,ZR2022ZD37,ZR2019ZD50;Natural Science Foundation of Qingdao Municipality,Grant/Award Number:23-2-1-75-zyyd-jch。

摘　　要：Traditional donor-acceptor type organic luminescent materials usually suffer from unfavorable spectral broadening and fluorescence quenching problems arising from strong inter/intra-chromophore interactions in aggregation state.Here,two ultraviolet carbazole-pyrimidine isomers(named o-DCz-Pm and m-DCz-Pm)with novel aggregation-induced narrowband phenomenon are constructed and systematic investigated by experiments and theoretical simulations.Benefitting from strengthened steric hindrance and multiple noncovalent interactions,the nonradiative decay,vibrational motion,and structural relaxation of singlet state can be effectively suppressed in aggregation state.Consequently,the electroluminescence peak of 397 nm,full width at half maximum of 21 nm and external quantum efficiency of 3.4%are achieved simultaneously in nondoped o-DCz-Pm-based device.This work paves an avenue toward the development of high-performance narrowband nondoped ultraviolet materials and organic light-emitting diodes.

关 键 词：aggregation-induced narrowband carbazole-pyrimidine derivatives nonbonding interactions organic light-emitting diodes ultraviolet emission 

分 类 号：O57[理学—粒子物理与原子核物理]