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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
Author(s) -
Kumsampao Jakkapan,
Chaiwai Chaiyon,
Chasing Pongsakorn,
Chawanpunyawat Thanyarat,
Namuangruk Supawadee,
Sudyoadsuk Taweesak,
Promarak Vinich
Publication year - 2020
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202000727
Subject(s) - triphenylamine , oled , electroluminescence , fluorescence , materials science , common emitter , acceptor , optoelectronics , photochemistry , electron donor , quantum efficiency , electron acceptor , diode , chemistry , optics , nanotechnology , physics , organic chemistry , layer (electronics) , condensed matter physics , catalysis
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 em =750 nm) with a very small ΔE ST 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.