Zhang Wei, Li Shuai, Gong Yujie, Zhang Jiachen, Zhou Yujie, Kong Jie, Fu Hongbing, Zhou Meng
Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Capital Normal University, Beijing, 100048, China.
Angew Chem Int Ed Engl. 2024 Jul 15;63(29):e202404978. doi: 10.1002/anie.202404978. Epub 2024 Jun 14.
Integrating aggregation-induced emission (AIE) into thermally activated delayed fluorescence (TADF) emitters holds great promise for the advancement of highly efficient organic light emitting diodes (OLEDs). Despite recent advancements, a thorough comprehension of the underlying mechanisms remains imperative for the practical application of such materials. In this work, we introduce a novel approach aimed at modulating the TADF process by manipulating dynamic processes in excited states through aggregation effect. Our findings reveal that aggregation not only enhances both prompt and delayed fluorescence simultaneously but also imposes constraints on molecular reorientation. This constraint reinforces spin-orbit coupling and reduces the energy gap between singlets and triplets. These insights deepen our understanding of the fundamental mechanisms governing the aggregation effect on TADF materials and provide valuable guidance for the design of high-efficiency photoluminescent materials.
将聚集诱导发光（AIE）集成到热激活延迟荧光（TADF）发光体中，对于高效有机发光二极管（OLED）的发展具有巨大潜力。尽管最近取得了进展，但要实际应用此类材料，深入理解其潜在机制仍然至关重要。在这项工作中，我们引入了一种新方法，旨在通过聚集效应操纵激发态的动态过程来调节TADF过程。我们的研究结果表明，聚集不仅能同时增强即时荧光和延迟荧光，还会对分子重排施加限制。这种限制增强了自旋 - 轨道耦合，并减小了单重态和三重态之间的能隙。这些见解加深了我们对聚集效应影响TADF材料基本机制的理解，并为高效光致发光材料的设计提供了有价值的指导。
