一种用于高效近红外热激活延迟荧光的简单且强缺电子的5,6-二氰基[2,1,3]苯并噻二唑核心给体-受体-给体化合物。
A Simple and Strong Electron-Deficient 5,6-Dicyano[2,1,3]benzothiadiazole-Cored Donor-Acceptor-Donor Compound for Efficient Near Infrared Thermally Activated Delayed Fluorescence.
作者信息
Kumsampao Jakkapan, Chaiwai Chaiyon, Chasing Pongsakorn, Chawanpunyawat Thanyarat, Namuangruk Supawadee, Sudyoadsuk Taweesak, Promarak Vinich
机构信息
Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand.
National Nanotechnology Center, National Science and Technology Development Agency, Pathumthani, 12120, Thailand.
出版信息
Chem Asian J. 2020 Oct 1;15(19):3029-3036. doi: 10.1002/asia.202000727. Epub 2020 Aug 28.
Despite the success of thermally activated delayed fluorescent (TADF) materials in steering the next generation of organic light-emitting diodes (OLEDs), effective near infrared (NIR) TADF emitters are still very rare. Here, we present a simple and extremely high electron-deficient compound, 5,6-dicyano[2,1,3]benzothiadiazole (CNBz), as a strong electron-accepting unit to develop a sufficiently strong donor-acceptor (D-A) interaction for NIR emission. End-capping with the electron-donating triphenylamine (TPA) unit created an effective D-A-D type system, giving rise to an efficient NIR TADF emissive molecule (λ =750 nm) with a very small ΔE of 0.06 eV. The electroluminescent device using this NIR TADF emitter exhibited an excellent performance with a high maximum radiance of 10020 mW Sr m , a maximum EQE of 6.57% and a peak wavelength of 712 nm.
尽管热激活延迟荧光（TADF）材料在引领下一代有机发光二极管（OLED）方面取得了成功，但有效的近红外（NIR）TADF发射体仍然非常罕见。在此，我们展示了一种简单且具有极高缺电子性的化合物5,6-二氰基[2,1,3]苯并噻二唑（CNBz），作为一种强电子接受单元，以形成足够强的供体-受体（D-A）相互作用用于近红外发射。用供电子的三苯胺（TPA）单元进行封端创建了一个有效的D-A-D型体系，产生了一种高效的近红外TADF发射分子（λ = 750 nm），其ΔE非常小，仅为0.06 eV。使用这种近红外TADF发射体的电致发光器件表现出优异的性能，具有10020 mW Sr m的高最大辐射亮度、6.57%的最大外量子效率和712 nm的峰值波长。
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