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- Title
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.
- Authors
Kumsampao, Jakkapan; Chaiwai, Chaiyon; Chasing, Pongsakorn; Chawanpunyawat, Thanyarat; Namuangruk, Supawadee; Sudyoadsuk, Taweesak; Promarak, Vinich
- Abstract
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 (λem=750 nm) with a very small ΔEST 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−1 m−2, a maximum EQE of 6.57% and a peak wavelength of 712 nm.
- Subjects
DELAYED fluorescence; LIGHT emitting diodes; ELECTROLUMINESCENT devices; ELECTRON-deficient compounds
- Publication
Chemistry - An Asian Journal, 2020, Vol 15, Issue 19, p3029
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.202000727