Strategic-tuning of radiative excitons for efficient and stable fluorescent white organic light-emitting diodes

Zhongbin Wu, Yuan Liu, Ling Yu, Chenyang Zhao, Dezhi Yang, Xianfeng Qiao, Jiangshan Chen, Chuluo Yang, Hans Kleemann, Karl Leo () and Dongge Ma ()
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Zhongbin Wu: South China University of Technology
Yuan Liu: Technische Universität Dresden
Ling Yu: Wuhan University
Chenyang Zhao: South China University of Technology
Dezhi Yang: South China University of Technology
Xianfeng Qiao: South China University of Technology
Jiangshan Chen: South China University of Technology
Chuluo Yang: Wuhan University
Hans Kleemann: Technische Universität Dresden
Karl Leo: Technische Universität Dresden
Dongge Ma: South China University of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract The emerging thermally activated delayed fluorescence materials have great potential for efficiencies in organic light-emitting diodes by optimizing molecular structures of the emitter system. However, it is still challenging in the device structural design to achieve high efficiency and stable device operation in white organic light-emitting diodes. Here we propose a universal design strategy for thermally activated delayed fluorescence emitter-based fluorescent white organic light-emitting diodes, establishing an advanced system of “orange thermally activated delayed fluorescence emitter sensitized by blue thermally activated delayed fluorescence host” combined with an effective exciton-confined emissive layer. Compared to reference single-layer and double-layer emissive devices, the external quantum efficiency improves by 31 and 45%, respectively, and device operational stability also shows nearly fivefold increase. Additionally, a detailed optical simulation for the present structure is made, indicating the validity of the design strategy in the fluorescent white organic light-emitting diodes.

Date: 2019
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DOI: 10.1038/s41467-019-10104-4

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