Heavy Atom Effect of Bromine Significantly Enhances Exciton Utilization of Delayed Fluorescence Luminogens,ACS Applied Materials & Interfaces

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Heavy Atom Effect of Bromine Significantly Enhances Exciton Utilization of Delayed Fluorescence Luminogens
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-05-03 00:00:00 , DOI: 10.1021/acsami.8b05389
Shifeng Gan ₁ , Shimin Hu ₁ , Xiang-Long Li ₁ , Jiajie Zeng ₁ , Dongdong Zhang ₂ , Tianyu Huang ₂ , Wenwen Luo ₁ , Zujin Zhao ₁ , Lian Duan ₂ , Shi-Jian Su ₁ , Ben Zhong Tang _{1,

3}

Affiliation

Raising triplet exciton utilization of pure organic luminescent materials is of significant importance for efficiency advancement of organic light-emitting diodes (OLEDs). Herein, by introducing bromine atom(s) onto a typical molecule (bis(carbazol-9-yl)-4,5-dicyanobenzene) with thermally activated delayed fluorescence, we demonstrate that the heavy atom effect of bromine can increase spin–orbit coupling and promote the reverse intersystem crossing, which endow the molecules with more distinct delayed fluorescence. In consequence, the triplet exciton utilization is improved greatly with the increase of bromine atoms, affording apparently advanced external quantum efficiencies of OLEDs. Utilizing the enhancement effect of bromine atoms on delayed fluorescence should be a simple and promising design concept for efficient organic luminogens with high exciton utilization.

中文翻译：

溴的重原子效应显着增强了延迟荧光发光剂的激子利用。

提高三重态激子对纯有机发光材料的利用对于提高有机发光二极管（OLED）的效率至关重要。在此，通过将溴原子引入具有热激活延迟荧光的典型分子（双（咔唑-9-基）-4,5-二氰基苯）上，我们证明了溴的重原子效应可以增加自旋-轨道耦合并促进反向系统间杂交，从而使分子具有更明显的延迟荧光。结果，随着溴原子的增加，三重态激子的利用率大大提高，从而明显提高了OLED的外部量子效率。

更新日期：2018-05-03

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