Jiao Yihang, Qiu Weidong, Li Mengke, Su Shi-Jian
State Key Laboratory of Luminescent Materials and Devices and Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials, South China University of Technology, Wushan Road 381, Tianhe District, Guangzhou, 510640, Guangdong Province, P. R. China.
Chemistry. 2024 Jul 25;30(42):e202401635. doi: 10.1002/chem.202401635. Epub 2024 Jul 8.
The adverse aggregated-caused quenching (ACQ) problem of most electroluminescent materials existing in highly doped thin films is one of the key factors impeding the commercialization of high-efficiency organic light-emitting diodes (OLEDs) panel. Whereas, by delicately constructing and modulating moderate intermolecular interactions, some aggregates have been demonstrated to present distinct luminescent properties such as tunable emission spectra, improved photoluminescence quantum yields, different emission mechanism and enhanced horizontal transition dipole ratio (Θ) of emitting layer, providing feasible solution for ACQ problem. The luminescence from newly generated emissive state in aggregates is different from the traditional "isolated" molecules in organic electronics and will possess novel properties and applications. Herein, we summarize the different types of intermolecular interactions within emitter aggregates exhibiting distinct luminescent mechanisms, as well as their effects on photoluminescent and electroluminescent properties, offering reliable reference for the advancement of highly efficient OLEDs utilizing aggregated emitters.
大多数电致发光材料在高掺杂薄膜中存在的不利聚集诱导猝灭（ACQ）问题是阻碍高效有机发光二极管（OLED）面板商业化的关键因素之一。然而，通过精心构建和调节适度的分子间相互作用，已证明一些聚集体具有独特的发光特性，如可调发射光谱、提高的光致发光量子产率、不同的发射机制以及发射层增强的水平跃迁偶极比（Θ），为ACQ问题提供了可行的解决方案。聚集体中新产生的发射态发出的光不同于有机电子学中传统的“孤立”分子，将具有新颖的性质和应用。在此，我们总结了表现出不同发光机制的发射体聚集体内不同类型的分子间相互作用，以及它们对光致发光和电致发光性质的影响，为利用聚集发射体的高效OLED的发展提供可靠参考。
