AIEgen configuration transition and aggregation enable dual prompt emission for single‐component nondoped white OLEDs
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
Affiliations
Jiasen Zhang
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
Qiang Wei
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
Wei Li
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
Hao Chen
Center for Aggregation‐Induced Emission State Key Laboratory of Luminescent Materials and Devices, South China University of Technology Guangzhou Guangzhou China
Xiangyu Zhu
Center for Aggregation‐Induced Emission State Key Laboratory of Luminescent Materials and Devices, South China University of Technology Guangzhou Guangzhou China
Yongqi Bai
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
Nannan Fei
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
Liang Cao
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
Zujin Zhao
Center for Aggregation‐Induced Emission State Key Laboratory of Luminescent Materials and Devices, South China University of Technology Guangzhou Guangzhou China
Anjun Qin
Center for Aggregation‐Induced Emission State Key Laboratory of Luminescent Materials and Devices, South China University of Technology Guangzhou Guangzhou China
Ben Zhong Tang
Shenzhen Institute of Aggregate Science and Technology School of Science and Engineering The Chinese University of Hong Kong Shenzhen China
Ziyi Ge
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
Abstract The dual emission (DE) feature in materials holds great potential to revolutionize the development of one‐component system white organic light‐emitting 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‐9H‐carbazol‐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···π interactions 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‐component WOLEDs. This research introduces a novel, simple, and efficient approach to realize highly efficient one‐molecule WOLEDs.
