Volume 135, Issue 7 e202216473
Forschungsartikel

Solution-Processable Pure-Red Multiple Resonance-induced Thermally Activated Delayed Fluorescence Emitter for Organic Light-Emitting Diode with External Quantum Efficiency over 20 %

Xinliang Cai

Xinliang Cai

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012 P. R. China

Contribution: Data curation (lead), Formal analysis (equal), Supervision (equal), Validation (equal), Writing - original draft (lead), Writing - review & editing (equal)

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Dr. Yincai Xu

Dr. Yincai Xu

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012 P. R. China

Contribution: Conceptualization (equal), Methodology (equal), Writing - original draft (equal)

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Yue Pan

Yue Pan

Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Science, Jilin University, Changchun, 130012 P. R. China

Contribution: Formal analysis (equal), Methodology (equal), Software (equal)

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Linjie Li

Linjie Li

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012 P. R. China

Contribution: Formal analysis (equal), Methodology (equal), Software (equal)

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Yexuan Pu

Yexuan Pu

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012 P. R. China

Contribution: Formal analysis (equal), Methodology (equal)

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Dr. Xuming Zhuang

Corresponding Author

Dr. Xuming Zhuang

Jihua Laboratory, 28 Huandao South Road, Foshan, 528200, Guangdong Province P. R. China

Contribution: Data curation (equal), Methodology (lead), Software (equal), Visualization (equal)

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Prof. Chenglong Li

Corresponding Author

Prof. Chenglong Li

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012 P. R. China

Chongqing Research Institute, Jilin University, Chongqing, 401120 P. R. China

Contribution: Conceptualization (lead), Formal analysis (equal), Methodology (equal), Supervision (equal), Visualization (equal), Writing - original draft (equal), Writing - review & editing (equal)

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Prof. Yue Wang

Prof. Yue Wang

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012 P. R. China

Jihua Laboratory, 28 Huandao South Road, Foshan, 528200, Guangdong Province P. R. China

Jihua Hengye Electronic Materials CO. LTD., Foshan, 528200, Guangdong Province P. R. China

Contribution: Supervision (equal), Visualization (equal), Writing - original draft (supporting)

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First published: 13 December 2022

Abstract

Developing solution-processable red organic light-emitting diodes (OLEDs) with high color purity and efficiency based on multiple resonance thermally activated delayed fluorescence (MR-TADF) is a formidable challenge. Herein, by introducing auxiliary electron donor and acceptor moieties into the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) distributed positions of multiple resonance skeleton simultaneously, an effective strategy to obtain red MR-TADF emitters was represented. The proof-of-the-concept molecule BN-R exhibits a narrowband pure-red emission at 624 nm, with a high luminous efficiency of 94 % and a narrow bandwidth of 46 nm. Notably, the fabricated solution-processable pure-red OLED based on BN-R exhibits a state-of-the-art external quantum efficiency over 20 % with the Commission Internationale de I’Éclairage coordinates of (0.663, 0.337) and a long operational lifetime (LT50) of 1088 hours at an initial luminance of 1000 cd m−2.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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