硫桥连多环发光体的分子工程用于可调谐热激活延迟荧光和室温磷光电致发光
Molecular Engineering of Sulfur-Bridged Polycyclic Emitters Towards Tunable TADF and RTP Electroluminescence.
作者信息
Li Mengke, Xie Wentao, Cai Xinyi, Peng Xiaomei, Liu Kunkun, Gu Qing, Zhou Jiadong, Qiu Weidong, Chen Zijian, Gan Yiyang, Su Shi-Jian
机构信息
State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Wushan Road 381, Tianhe District, Guangzhou, 510640, Guangdong Province, P. R. China.
出版信息
Angew Chem Int Ed Engl. 2022 Aug 26;61(35):e202209343. doi: 10.1002/anie.202209343. Epub 2022 Jul 21.
Highly efficient organic thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP) emitters for organic light-emitting diodes (OLEDs) generally consist of a twisted donor-acceptor skeleton with aromatic amine donors. Herein, through introducing sulfur atoms into isomeric pentaphene and pentacene frameworks, we demonstrate a set of polycyclic luminophores exhibiting efficient TADF and RTP characters. The incorporation of sulfur atoms confirms a folded molecular plane, while intensifies singlet-triplet spin-orbit coupling. Further, the isomeric effect has a significant effect on the electronic structure of excited state, giving rise to the investigated compounds tunable luminescence mechanisms of TADF and RTP. With efficient triplet harvesting ability, maximum external quantum efficiencies up to 25.1 % and 8.7 % are achieved for the corresponding TADF and RTP OLEDs, verifying the great potential of sulfur-bridged frameworks for highly efficient devices.
用于有机发光二极管（OLED）的高效有机热激活延迟荧光（TADF）和室温磷光（RTP）发光体通常由带有芳族胺供体的扭曲供体-受体骨架组成。在此，通过将硫原子引入异构体并五苯和并五苯骨架中，我们展示了一组具有高效TADF和RTP特性的多环发光体。硫原子的引入确定了折叠的分子平面，同时增强了单重态-三重态自旋-轨道耦合。此外，异构体效应显著影响激发态的电子结构，使所研究的化合物具有可调节的TADF和RTP发光机制。凭借高效的三重态捕获能力，相应的TADF和RTP OLED实现了高达25.1%和8.7%的最大外量子效率，证实了硫桥骨架在高效器件方面的巨大潜力。
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