Volume 133, Issue 41 pp. 22415-22421
Zuschrift

High-Performance Ultraviolet Organic Light-Emitting Diode Enabled by High-Lying Reverse Intersystem Crossing

Han Zhang

Han Zhang

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

These authors contributed equally to this work.

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Ganggang Li

Ganggang Li

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

These authors contributed equally to this work.

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Xiaomin Guo

Xiaomin Guo

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

These authors contributed equally to this work.

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Kai Zhang

Kai Zhang

Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan, 250014 China

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Bing Zhang

Bing Zhang

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

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Xuecheng Guo

Xuecheng Guo

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

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Yuxuan Li

Yuxuan Li

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

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Jianzhong Fan

Jianzhong Fan

Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan, 250014 China

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Prof. Zhiming Wang

Corresponding Author

Prof. Zhiming Wang

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

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Prof. Dongge Ma

Prof. Dongge Ma

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

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Prof. Ben Zhong Tang

Corresponding Author

Prof. Ben Zhong Tang

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

Shenzhen Institute of Aggregate Science and Technology, School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, 518172 China

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First published: 13 August 2021
Citations: 13

Abstract

Ultraviolet (UV) organic emitters that can open up applications for future organic light-emitting diodes (OLEDs) are of great value but rarely developed. Here, we report a high-quality UV emitter with hybridized local and charge-transfer (HLCT) excited state and its application in UV OLEDs. The UV emitter, 2BuCz-CNCz, shows the features of low-lying locally excited (LE) emissive state and high-lying reverse intersystem crossing (hRISC) process, which helps to balance the color purity and exciton utilization of UV OLED. Consequently, the OLED based on 2BuCz-CNCz exhibits not only a desired narrowband UV electroluminescent (EL) at 396 nm with satisfactory color purity (CIEx, y=0.161, 0.031), but also a record-high maximum external quantum efficiency (EQE) of 10.79 % with small efficiency roll-off. The state-of-the-art device performance can inspire the design of UV emitters, and pave a way for the further development of high-performance UV OLEDs.

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