journal article·2022-06-06

Improving the Efficiency of AIEgen-Based Nondoped Blue Organic Light-Emitting Diode by Rational Isomer Engineering

Pengbo Han, Chengwei Lin, He Xu, Erhan Xia, Dezhi Yang, Anjun Qin, Dongge Ma, Ben Zhong Tang

ACS Materials Letters· Volume 4· Issue 6
Publisher page

Abstract

The development of efficient and stable blue emitters remains a great challenge for organic light-emitting diodes (OLEDs). Herein, a pair of tetraphenylbenzene (TPB)-based isomers of TPB-2AC and iTPB-2AC featuring aggregation-induced emission characteristics are designed and synthesized by attaching two diphenylamine (DPA) moieties and two cyano (CN) groups on its peripheral vicinal or alternating phenyl rings. The nondoped blue OLED with iTPB-2AC as emitting layer exhibits a maximum external quantum efficiency (EQE) of 8.23% with a low operation voltage of 2.8 V, and the performance of the device is comparable with the reported nondoped blue OLEDs based on conventional fluorescent emitters. Whereas, the TPB-2AC-based device shows a low efficiency roll-off effect. Their horizontal dipole orientation and “hot exciton” process were rationalized to play key roles for these performance differences. This work provides a general strategy to achieve high-performance nondoped blue OLED by rational isomer engineering.
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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Organic Electronics and Photovoltaics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, Center for Aggregation-Induced Emission, AIE Institute, South China University of Technology, Guangzhou 510640, China

School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong, 2001 Longxiang Boulevard, Longgang District, Shenzhen City 518172, Guangdong, China

Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon SAR 999077, Hong Kong, China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Innovation and Technology Commission of Hong Kong

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