具有高外量子效率和饱和红色发射颜色的溶液处理纯红色 TADF 有机发光二极管,Advanced Materials

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具有高外量子效率和饱和红色发射颜色的溶液处理纯红色 TADF 有机发光二极管
Advanced Materials ( IF 27.4 ) Pub Date : 2023-01-18 , DOI: 10.1002/adma.202208602
Shantaram Kothavale ₁ , Seung Chan Kim ₁ , Kiun Cheong ₁ , Songkun Zeng ₂ , Yafei Wang ₂ , Jun Yeob Lee _{1,

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Affiliation

尽管最近在红色热激活延迟荧光 (TADF) 发射器方面取得了研究进展，但很少报道高效可溶液加工的纯红色 TADF 发射器。迄今为止报道的大多数红色 TADF 发射器都是使用刚性受体单元设计的，这使得它们不溶并且不适用于溶液处理的有机发光二极管 (OLED)。为了解决这个问题，一种新型 TADF 发射体，6,7-双(4-(双(4-(叔丁基)苯基)氨基)苯基)-2,3-双(4-(叔丁基)苯基)喹喔啉-5,8-二腈 ( tBuTPA-CNQx) 被设计合成。高度扭曲的供体-受体结构和适当的最高占据分子轨道/最低未占据分子轨道分布导致非常小的 0.07 eV 单重态-三重态能隙、92% 的高光致发光量子产率和 52.4 µs 的短延迟荧光寿命。外围的叔丁基苯基修饰的喹喔啉受体单元和叔丁基保护的三苯胺供体单元被证明是有用的结构单元，可提高溶解度并最大限度地减少分子间相互作用。基于t的溶液处理OLEDBuTPA-CNQx 实现了 16.7% 的高外部量子效率 (EQE)，纯红色发射峰位于 662 nm，这是迄今为止在溶液处理的纯红色 TADF OLED 中报道的最高 EQE 值之一。此外，基于t BuTPA-CNQx 的真空可加工 OLED 具有 22.2% 的高 EQE 和可忽略不计的效率下降。

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Solution-Processed Pure Red TADF Organic Light-Emitting Diodes With High External Quantum Efficiency and Saturated Red Emission Color

In spite of recent research progress in red thermally activated delayed fluorescence (TADF) emitters, highly efficient solution-processable pure red TADF emitters are rarely reported. Most of the red TADF emitters reported to date are designed using a rigid acceptor unit which renders them insoluble and unsuitable for solution-processed organic light-emitting diodes (OLEDs). To resolve this issue, a novel TADF emitter, 6,7-bis(4-(bis(4-(tert-butyl)phenyl)amino)phenyl)-2,3-bis(4-(tert-butyl)phenyl)quinoxaline-5,8-dicarbonitrile (tBuTPA-CNQx) is designed and synthesized. The highly twisted donor-acceptor architecture and appropriate highest occupied molecular orbital/lowest unoccupied molecular orbital distribution lead to a very small singlet-triplet energy gap of 0.07 eV, high photoluminescence quantum yield of 92%, and short delayed fluorescence lifetime of 52.4 µs. The peripheral t-butyl phenyl decorated quinoxaline acceptor unit and t-butyl protected triphenylamine donor unit are proven to be useful building blocks to improve solubility and minimize the intermolecular interaction. The solution-processed OLED based on tBuTPA-CNQx achieves a high external quantum efficiency (EQE) of 16.7% with a pure red emission peak at 662 nm, which is one of the highest EQE values reported till date in the solution-processed pure red TADF OLEDs. Additionally, vacuum-processable OLED based on tBuTPA-CNQx exhibits a high EQE of 22.2% and negligible efficiency roll-off.

更新日期：2023-01-18

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