The Design of Fused Amine/Carbonyl System for Efficient Thermally Activated Delayed Fluorescence: Novel Multiple Resonance Core and Electron Acceptor,Advanced Optical Materials

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The Design of Fused Amine/Carbonyl System for Efficient Thermally Activated Delayed Fluorescence: Novel Multiple Resonance Core and Electron Acceptor
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-01-08 , DOI: 10.1002/adom.201801536
Yi Yuan ₁ , Xun Tang ₁ , Xiao‐Yang Du ₂ , Yun Hu ₁ , You‐Jun Yu ₁ , Zuo‐Quan Jiang ₁ , Liang‐Sheng Liao _{1,

3} , Shuit‐Tong Lee ₁

Affiliation

Multiple resonances induced thermally activated delayed fluorescence (MR‐TADF) has great advantages in high color purity display. Up to now, current MR‐TADF emitters are only based on the boron‐nitrogen‐containing fragment. Reported herein is a novel class of MR‐TADF emitter, quinolino[3,2,1‐de]acridine‐5,9‐dione (QAO), realized by the opposite resonance effect of the carbonyl and the nitrogen atoms, which is also the smallest TADF emitter reported so far. The QAO‐based pure blue organic light‐emitting diode achieves a maximum external quantum efficiency (EQE_max) of 19.4% with a small full width at half maximum of 39 nm. Moreover, tert‐butyl modified QAO can be employed as an efficient electron acceptor to construct an efficient yellow‐green evaporation and solution process feasible TADF emitter, 7‐(tert‐butyl)‐3,11‐bis(9,9‐dimethylacridin‐10(9H)‐yl)quinolino[3,2,1‐de]acridine‐5,9‐dione (QAO‐DAd), with significantly improved performance as compared to the previous flexible diketone‐based emitters.

中文翻译：

高效热活化延迟荧光熔融胺/羰基体系的设计：新型多共振核和电子受体

多重共振诱导的热激活延迟荧光（MR-TADF）在高色纯度显示中具有巨大优势。到目前为止，当前的MR-TADF发射器仅基于含硼氮的碎片。本文报道的是一类新型的MR-TADF发射体，喹啉基[3,2,1- de ] ac啶-5,9-二酮（QAO），通过羰基和氮原子的相反共振效应实现，这也是迄今为止报告的最小的TADF发射器。基于QAO的纯蓝色有机发光二极管实现了19.4％的最大外部量子效率（EQE _max），在39 nm的一半最大值处具有较小的全宽度。而且，叔叔丁基改性的QAO可用作有效的电子受体，以构建有效的黄绿色蒸发和固溶过程可行的TADF发射体7-（叔丁基）-3,11-双（9,9-二甲基ac啶10（9）H）yl ）quinolino [3,2,1- de ] ac啶-5,9-dione（QAO-DAd），与以前的基于二酮的柔性发射体相比，性能得到显着改善。

更新日期：2019-01-08

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