Peripherally Heavy-Atom-Decorated Strategy Towards High-Performance Pure Green Electroluminescence with External Quantum Efficiency over 40 %

被引：73

作者：

Hu, Yuxuan ^{[1
,2
]}

Miao, Jingsheng ^{[1
]}

Zhong, Cheng ^{[3
]}

Zeng, Yang ^{[1
]}

Gong, Shaolong ^{[3
]}

Cao, Xiaosong ^{[1
]}

Zhou, Xue ^{[4
]}

Gu, Yu ^{[4
]}

Yang, Chuluo ^{[1
]}

机构：

[1] Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab New Informat Display & Storage Ma, Shenzhen 518060, Peoples R China

[2] Shenzhen Univ, Coll Phys & Optoeletron Engn, Shenzhen 518060, Peoples R China

[3] Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China

[4] Wuhan China Star Optoelect Semicond Display Techno, Wuhan 430078, Hubei, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2023年 / 62卷 / 19期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Heavy-Atom Effect; Multi-Resonance; Organic Light-Emitting Diode; Pure Green; Reduced Roll-off; LIGHT-EMITTING-DIODES; ACTIVATED DELAYED FLUORESCENCE;

D O I：

10.1002/anie.202302478

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Heavy-atom integration into thermally activated delayed fluorescence (TADF) molecule could significantly promote the reverse intersystem crossing (RISC) process. However, simultaneously achieving high efficiency, small roll-off, narrowband emission and good operational lifetime remains a big challenge for the corresponding organic light-emitting diodes (OLEDs). Herein, we report a pure green multi-resonance TADF molecule BN-STO by introducing a peripheral heavy atom selenium onto the parent BN-Cz molecule. The organic light-emitting diode device based on BN-STO exhibited state-of-the-art performance with a maximum external quantum efficiency (EQE) of 40.1 %, power efficiency (PE) of 176.9 lm W-1, well-suppressed efficiency roll-off and pure green gamut. This work reveals a feasible strategy to reach a balance between fast RISC process and narrow full width at half maximum (FWHM) of MR-TADF by heavy atom effect.

引用

页数：8

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