Highly Efficient Green and Red Narrowband Emissive Organic Light-Emitting Diodes Employing Multi-Resonant Thermally Activated Delayed Fluorescence Emitters

被引：43

作者：

Wu, Sen ^{[1
]}

Gupta, Abhishek Kumar ^{[1
,2
]}

Yoshida, Kou ^{[2
]}

Gong, Junyi ^{[2
]}

Hall, David ^{[1
]}

Cordes, David B. ^{[1
]}

Slawin, Alexandra M. Z. ^{[1
]}

Samuel, Ifor D. W. ^{[2
]}

Zysman-Colman, Eli ^{[1
]}

机构：

[1] Univ St Andrews, EaStCHEM Sch Chem, Organ Semicond Ctr, St Andrews KY16 9ST, Fife, Scotland

[2] Univ St Andrews, SUPA Sch Phys & Astron, Organ Semicond Ctr, St Andrews KY16 9SS, Fife, Scotland

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2022年 / 61卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

Horizontal Orientation; Hyperfluorescence; Multi-Resonance; Organic Light-Emitting Diodes; Thermally Activated Delayed Fluorescence; TADF;

D O I：

10.1002/anie.202213697

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Herein, we demonstrate how judicious selection of the donor decorating a central multi-resonant thermally activated delayed fluorescence (MR-TADF) core based on DiKTa can lead to very high-performance OLEDs. By decorating the DiKTa core with triphenylamine (TPA) and diphenylamine (DPA), 3TPA-DiKTa and 3DPA-DiKTa exhibit bright, narrowband green and red emission in doped films, respectively. The OLEDs based on these emitters showed record-high performance for this family of emitters with maximum external quantum efficiencies (EQE(max)) of 30.8% for 3TPA-DiKTa at lambda (EL) of 551nm and 16.7% for 3DPA-DiKTa at lambda (EL)=613nm. The efficiency roll-off in the OLEDs was improved significantly by using 4CzIPN as an assistant dopant in hyperfluorescence (HF) devices. The outstanding device performance has been attributed to preferential horizontal orientation of the transition dipole moments of 3TPA-DiKTa and 3DPA-DiKTa.

引用

页数：9

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