High-Performance Ultraviolet Organic Light-Emitting Diode Enabled by High-Lying Reverse Intersystem Crossing,Angewandte Chemie International Edition

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High-Performance Ultraviolet Organic Light-Emitting Diode Enabled by High-Lying Reverse Intersystem Crossing
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-08-13 , DOI: 10.1002/anie.202108540
Han Zhang ₁ , Ganggang Li ₁ , Xiaomin Guo ₁ , Kai Zhang ₂ , Bing Zhang ₁ , Xuecheng Guo ₁ , Yuxuan Li ₁ , Jianzhong Fan ₂ , Zhiming Wang ₁ , Dongge Ma ₁ , Ben Zhong Tang _{1,

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Affiliation

Ultraviolet (UV) organic emitters that can open up applications for future organic light-emitting diodes (OLEDs) are of great value but rarely developed. Here, we report a high-quality UV emitter with hybridized local and charge-transfer (HLCT) excited state and its application in UV OLEDs. The UV emitter, 2BuCz-CNCz, shows the features of low-lying locally excited (LE) emissive state and high-lying reverse intersystem crossing (hRISC) process, which helps to balance the color purity and exciton utilization of UV OLED. Consequently, the OLED based on 2BuCz-CNCz exhibits not only a desired narrowband UV electroluminescent (EL) at 396 nm with satisfactory color purity (CIE_{x, y}=0.161, 0.031), but also a record-high maximum external quantum efficiency (EQE) of 10.79 % with small efficiency roll-off. The state-of-the-art device performance can inspire the design of UV emitters, and pave a way for the further development of high-performance UV OLEDs.

中文翻译：

通过高位反向系统间交叉实现的高性能紫外有机发光二极管

可以为未来的有机发光二极管 (OLED) 开辟应用的紫外线 (UV) 有机发射器具有巨大的价值，但很少被开发出来。在这里，我们报告了一种具有混合局部和电荷转移 (HLCT) 激发态的高质量 UV 发射器及其在 UV OLED 中的应用。UV 发射器 2BuCz-CNCz 具有低位局部激发 (LE) 发射态和高位反向系统间交叉 (hRISC) 工艺的特性，有助于平衡 UV OLED 的色纯度和激子利用率。因此，基于 2BuCz-CNCz 的 OLED 不仅在 396 nm 处表现出所需的窄带紫外电致发光 (EL) 以及令人满意的色纯度 (CIE _{x , y}=0.161, 0.031)，而且最大外量子效率 (EQE) 达到创纪录的 10.79 %，效率下降很小。最先进的器件性能可以激发紫外线发射器的设计灵感，并为高性能紫外线 OLED 的进一步发展铺平道路。

更新日期：2021-09-27

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