AIEgen configuration transition and aggregation enable dual prompt emission for single-component nondoped white OLEDs  

作　　者：Jiasen Zhang Qiang Wei Wei Li Hao Chen Xiangyu Zhu Yongqi Bai Nannan Fei Liang Cao Zujin Zhao Anjun Qin Ben Zhong Tang Ziyi Ge 

机构地区：[1]Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo,P.R.China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,P.R.China [3]Center for Aggregation-Induced Emission State Key Laboratory of Luminescent Materials and Devices,South China University of Technology Guangzhou,Guangzhou,China [4]Shenzhen Institute of Aggregate Science and Technology,School of Science and Engineering,The Chinese University of Hong Kong,Shenzhen,China

出　　处：《Aggregate》2024年第1期292-298,共7页聚集体（英文）

基　　金：National Science Fund for Distinguished Young Scholars,Grant/Award Number:21925506;National Natural Science Foundation of China,Grant/Award Numbers:U21A20331,51773212,81903743,52003088;Ningbo Key Scientific and Technological Project,Grant/Award Numbers:2022Z124,2022Z119。

摘　　要：The dual emission(DE)feature in materials holds great potential to revolutionize the development of one-component system white organic lightemitting diodes(WOLEDs).However,the reported DE materials remain scarce owing to the formidable challenge of breaking Kasha’s rule and managing the intricate energy/charge transfer processes.Herein,we have introduced a groundbreaking DE AIEgen,2CzAn-TPE,which possesses a simple structure and undergoes Z-to-E isomerization and exhibits yellow and red fluorescence powders for pre-and post-sublimation,respectively.With relatively lower potential energy,Z-conformation((Z)-1,2-diphenyl-1,2-bis(4-(10-(9-phenyl-9H-carbazol-3-yl)anthracen-9-yl)phenyl)ethene)of 2CzAn-TPE can be readily transformed into E-conformation((E)-1,2-diphenyl-1,2-bis(4-(10-(9-phenyl-9Hcarbazol-3-yl)anthracen-9-yl)phenyl)ethene)via vacuum sublimation.The utilization of X-ray diffraction and grazing-incidence-wide-angle X-ray scattering techniques confirms the structural transformation,while the crystallographic analysis reveals the establishment of numerous intermolecular CH⋅⋅⋅πinteractions between the tetraphenylethene(TPE)moiety and both the anthracene and carbazole units.This allows a densely packed molecular arrangement,thereby offering propitious conditions for excimer generation in the E-conformation aggregated state.By utilizing the sublimated 2CzAn-TPE as an emitter,a nondoped one-component WOLED was prepared,exhibiting an exceptionally high external quantum efficiency(EQE)of 5.0%,which represents one of the highest performances among all one-componentWOLEDs.This research introduces a novel,simple,and efficient approach to realize highly efficient one-molecule WOLEDs.

关 键 词：aggregation-induced emission dual emission ISOMERIZATION white OLED 

分 类 号：TB34[一般工业技术—材料科学与工程]