State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission, South China University of Technology, Guangzhou, 510640, China.
Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science & Technology, Kowloon, Hong Kong, China.
Chem Asian J. 2019 Mar 15;14(6):828-835. doi: 10.1002/asia.201801588. Epub 2018 Dec 10.
Aggregation-induced delayed fluorescence (AIDF) can be regarded as a special case of aggregation-induced emission (AIE). Luminogens with AIDF can simultaneously emit strongly in solid state and fully utilize the singlet and triplet excitons in organic light-emitting diodes (OLEDs). In this work, two new AIDF luminogens, DMF-BP-DMAC and DPF-BP-DMAC, with an asymmetric D-A-D' structure, are designed and synthesized. The characteristics of both luminogens are systematically investigated, including single crystal structures, theoretical calculations, photophysical properties and thermal stabilities. Inspired by their AIDF nature, the green-emission non-doped OLEDs based on them are fabricated, which afford good electroluminescence performances, with low turn-on voltages of 2.8 V, high luminance of 52560 cd m , high efficiencies of up to 14.4 %, 42.3 cd A and 30.2 lm W , and very small efficiency roll-off. The results strongly indicate the bright future of non-doped OLEDs on the basis of robust AIDF luminogens.
聚集诱导延迟荧光（AIDF）可以被视为聚集诱导发射（AIE）的特殊情况。具有 AIDF 的发光体可以在固态中同时强烈发射，并充分利用有机发光二极管（OLED）中的单线态和三线态激子。在这项工作中，设计并合成了两种具有不对称 D-A-D'结构的新型 AIDF 发光体，DMF-BP-DMAC 和 DPF-BP-DMAC。对这两种发光体的特性进行了系统研究，包括单晶结构、理论计算、光物理性质和热稳定性。受其 AIDF 性质的启发，基于它们制备了绿色发射的无掺杂 OLED，其提供了良好的电致发光性能，具有低的开启电压 2.8 V、高亮度 52560 cd m 、高达 14.4%、42.3 cd A 和 30.2 lm W 的高效率以及非常小的效率滚降。结果强烈表明，基于稳健的 AIDF 发光体，无掺杂 OLED 的前景光明。
