Chen Wen-Cheng, Su Yaozu, Wu Xiaohui, Wang Ruicheng, Jin Jia-Ming, Zheng Fan, Liu Xiao-Long, Zhang Yuzhen, He Nian, Sun Yuxi, Zeng Qingming, Huo Yanping
Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, 515200, People's Republic of China.
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.
Chem Asian J. 2024 Oct 16;19(20):e202400741. doi: 10.1002/asia.202400741. Epub 2024 Sep 14.
Achieving the concurrent manifestation of thermally activated delayed fluorescence (TADF) and aggregation-induced emission (AIE) within a single molecular system is highly sought after for organic light-emitting diodes (OLEDs), yet remains rare. In this study, we present a novel TADF-AIE dye, named PQMO-PXZ, which has been designed, synthesized, and systematically characterized. Our comprehensive investigation, which includes structural analysis, theoretical calculations, and optical studies, evaluates the potential of PQMO-PXZ for integration into OLEDs. Unlike existing azaryl-ketone-based emitters, PQMO-PXZ exhibits red-shifted emission and enhanced luminescence efficiency, due to its rigid structure and strong intramolecular charge transfer characteristics. Significantly, PQMO-PXZ demonstrates pronounced AIE properties and TADF with a short delayed lifetime. When utilized as the emissive core, OLED devices based on PQMO-PXZ achieve a respectable external quantum efficiency of up to 11.8 % with minimal efficiency roll-off, underscoring PQMO-PXZ's promise as a highly efficient candidate for OLED applications.
在单一分子体系中同时实现热激活延迟荧光（TADF）和聚集诱导发光（AIE），这是有机发光二极管（OLED）领域备受追捧的目标，但目前仍较为罕见。在本研究中，我们展示了一种名为PQMO-PXZ的新型TADF-AIE染料，该染料已完成设计、合成及系统表征。我们的全面研究，涵盖结构分析、理论计算和光学研究，评估了PQMO-PXZ集成到OLED中的潜力。与现有的基于氮芳基酮的发光体不同，PQMO-PXZ由于其刚性结构和强分子内电荷转移特性，呈现出红移发射和增强的发光效率。值得注意的是，PQMO-PXZ展现出显著的AIE特性和具有短延迟寿命的TADF。当用作发光核心时，基于PQMO-PXZ的OLED器件实现了高达11.8%的可观外量子效率，且效率滚降极小，这突出了PQMO-PXZ作为OLED应用高效候选材料的前景。
