Managing Locally Excited and Charge‐Transfer Triplet States to Facilitate Up‐Conversion in Red TADF Emitters That Are Available for Both Vacuum‐ and Solution‐Processes,Angewandte Chemie International Edition

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Managing Locally Excited and Charge‐Transfer Triplet States to Facilitate Up‐Conversion in Red TADF Emitters That Are Available for Both Vacuum‐ and Solution‐Processes
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-10-20 , DOI: 10.1002/anie.202012070
Jia‐Xiong Chen _{1,

2,

3} , Ya‐Fang Xiao ₂ , Kai Wang ₁ , Dianming Sun ₁ , Xiao‐Chun Fan ₁ , Xiang Zhang ₁ , Ming Zhang ₁ , Yi‐Zhong Shi ₁ , Jia Yu ₁ , Feng‐Xia Geng ₃ , Chun‐Sing Lee ₂ , Xiao‐Hong Zhang ₁

Affiliation

Developing red thermally activated delayed fluorescence (TADF) emitters for high‐performance OLEDs is still facing great challenge. Herein, three red TADF emitters, pDBBPZ‐DPXZ, pDTBPZ‐DPXZ, and oDTBPZ‐DPXZ, are designed and synthesized with same donor–acceptor (D‐A) backbone with different peripheral groups attaching on the A moieties. Their lowest triplet states change from locally excited to charge transfer character leading to significantly enhance reverse intersystem crossing process. In particular, oDTBPZ‐DPXZ exhibits efficient TADF feature and exciton utilization. It not only achieves an external quantum efficiency (EQE) of 20.1 % in red vacuum‐processed OLED, but also realize a high EQE of 18.5 % in a solution‐processed OLED, which is among the best results in solution‐processed red TADF OLEDs. This work provides an effective strategy for designing red TADF molecules by managing energy level alignments to facilitate the up‐conversion process and thus enhance exciton harvesting.

中文翻译：

管理本地激发态和电荷转移三重态，以促进可用于真空和溶液工艺的红色TADF发射器的上转换

开发用于高性能OLED的红色热激活延迟荧光（TADF）发射器仍然面临巨大挑战。在此，设计并合成了三个红色TADF发射体pDBBPZ-DPXZ，pDTBPZ-DPXZ和oDTBPZ-DPXZ，并使用相同的供体-受体（D-A）主链，并在A部分上连接了不同的外围基团。它们的最低三线态从局部激发变为电荷转移，从而显着增强了反向系统间交叉过程。特别是，oDTBPZ-DPXZ具有高效的TADF功能和激子利用率。它不仅在红色真空处理的OLED中实现20.1％的外部量子效率（EQE），而且在溶液处理的OLED中实现18.5％的高EQE，这在溶液处理的红色TADF OLED中是最好的结果之一。

更新日期：2020-10-20

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