Facile access to deep red/near-infrared emissive AIEgens for efficient non-doped OLEDs†,Chemical Science

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Facile access to deep red/near-infrared emissive AIEgens for efficient non-doped OLEDs†
Chemical Science ( IF 7.6 ) Pub Date : 2018-06-25 00:00:00 , DOI: 10.1039/c8sc01377b
Will W H Lee ₁ , Zheng Zhao _{1,

2} , Yuanjing Cai ₃ , Zeng Xu ₃ , Ying Yu ₁ , Yu Xiong ₂ , Ryan T K Kwok ₁ , Yue Chen ₃ , Nelson L C Leung ₁ , Dongge Ma ₃ , Jacky W Y Lam ₁ , Anjun Qin ₃ , Ben Zhong Tang _{1,

2,

3}

Affiliation

Notwithstanding the huge demand in bio-imaging and optoelectronics, the construction of highly emissive deep red/near infrared (DR/NIR) organic luminogens is still a big challenge because a narrow energy gap generally leads to low photoluminescence quantum yield. It is even more difficult to afford DR/NIR emitters in the solid state due to the aggregation caused quenching (ACQ) effect. In this work, we found that the direct attachment of a tetraphenylethylene substituted arylamine to the electron accepting 2,1,3-benzothiadiazole produces DR/NIR AIE luminogens with bright emission facilely and efficiently. And the emission wavelengths could be tuned from the red to the DR/NIR region by regulating the variety of the substituents. The long emission wavelength and high photoluminescence quantum yield of these AIEgens are ascribed to the effective intramolecular charge transfer and the suppressed intramolecular motion. Furthermore, non-doped OLEDs based on one of the AIEgens showed an EL emission at 684 nm with a large radiance of 5772 mW Sr⁻¹ m⁻² and an impressive external quantum efficiency (EQE) of 1.73%.

中文翻译：

轻松获得深红/近红外发射 AIEgens，实现高效非掺杂 OLED†

尽管生物成像和光电子学的需求巨大，但高发射深红/近红外（DR/NIR）有机发光体的构建仍然是一个巨大的挑战，因为窄的能隙通常会导致低的光致发光量子产率。由于聚集引起的猝灭（ACQ）效应，提供固态 DR/NIR 发射器甚至更加困难。在这项工作中，我们发现四苯乙烯取代的芳胺直接连接到电子接受的 2,1,3-苯并噻二唑上可以轻松有效地产生具有明亮发射的 DR/NIR AIE 发光体。通过调节取代基的种类，可以将发射波长从红光调节到DR/NIR区域。这些AIEgens的长发射波长和高光致发光量子产率归因于有效的分子内电荷转移和抑制的分子内运动。此外，基于AIEgens之一的非掺杂OLED在684 nm处显示出EL发射，辐射亮度高达5772 mW Sr ^-1 m ^-2 ，外量子效率（EQE）高达1.73%。

更新日期：2018-06-25

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