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.

中文翻译：

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一种简单而强的电子不足的5,6-二氰基[2,1,3]苯并噻二唑修饰的供体-受体-供体化合物，用于有效的近红外热活化延迟荧光。

尽管热活化延迟荧光（TADF）材料在控制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发射器仍然很少。在这里，我们提出了一种简单且极高的电子不足化合物5,6-二氰基[2,1,3]苯并噻二唑（CNBz），作为形成足够强的供体受体的强电子接受单元（D-A ）进行NIR发射的相互作用。封端用供电子性三苯基胺（TPA）单元创建一个有效的d-A-d类型的系统，从而产生一个有效的NIR TADF发射分子（λ _EM = 750纳米）具有非常小的ΔE _ST为0.06 eV。使用该NIR TADF发射器的电致发光器件表现出优异的性能，具有10020 mW Sr ^-1  m ^-2的高最大辐射度，6.57％的最大EQE和712 nm的峰值波长。