Cai Zheyi, Wu Xing, Liu Hao, Guo Jingjing, Yang Dezhi, Ma Dongge, Zhao Zujin, Tang Ben Zhong
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China.
Shenzhen Institute of Aggregate Science and Technology, School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong, 518172, China.
Angew Chem Int Ed Engl. 2021 Oct 25;60(44):23635-23640. doi: 10.1002/anie.202111172. Epub 2021 Oct 1.
Tailor-made red thermally activated delayed fluorescence (TADF) molecules comprised of an electron-withdrawing pyrazino[2,3-f][1,10]phenanthroline-2,3-dicarbonitrile core and various electron-donating triarylamines are developed. They can form intramolecular hydrogen-bonding, which is conducive to improving emission efficiency and promoting horizontal orientation and show near infrared (NIR) emissions (692-710 nm) in neat films and red delayed fluorescence (606-630 nm) with high photoluminescence quantum yields (73-90%) in doped films. They prefer horizontal orientation with large horizontal dipole ratios in films, rendering high optical out-coupling factors (0.39-0.41). Their non-doped OLEDs exhibit NIR lights (716-748 nm) with maximum external quantum efficiencies (η ) of 1.0-1.9%. And their doped OLEDs radiate red lights (606-648 nm) and achieve record-beating η of up to 31.5%. These new red TADF materials should have great potentials in display and lighting devices.
开发了由吸电子的吡嗪并[2,3-f][1,10]菲咯啉-2,3-二甲腈核心和各种给电子三芳基胺组成的定制红色热激活延迟荧光（TADF）分子。它们可以形成分子内氢键，这有利于提高发射效率并促进水平取向，并且在纯薄膜中显示近红外（NIR）发射（692 - 710 nm），在掺杂薄膜中显示具有高光致发光量子产率（73 - 90%）的红色延迟荧光（606 - 630 nm）。它们在薄膜中倾向于具有大水平偶极比的水平取向，从而具有高光学外耦合因子（0.39 - 0.41）。它们的非掺杂有机发光二极管（OLED）发射近红外光（716 - 748 nm），最大外量子效率（η）为1.0 - 1.9%。并且它们的掺杂OLED发射红光（606 - 648 nm），并实现了高达31.5%的创纪录外量子效率。这些新型红色TADF材料在显示和照明设备中应具有巨大潜力。
