Hydrogen bond-modulated molecular packing and its applications in high-performance non-doped organic electroluminescence,Materials Horizons

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Hydrogen bond-modulated molecular packing and its applications in high-performance non-doped organic electroluminescence
Materials Horizons ( IF 12.2 ) Pub Date : 2020-08-13 , DOI: 10.1039/d0mh00952k
Yizhong Shi _{1,

2,

3,

4} , Kai Wang _{1,

2,

3,

4,

5} , Youichi Tsuchiya _{5,

6,

7,

8,

9} , Wei Liu _{1,

2,

3,

4,

5} , Takeshi Komino _{5,

6,

7,

8} , Xiaochun Fan _{1,

2,

3,

4} , Dianming Sun _{1,

2,

3,

4} , Gaole Dai _{1,

2,

3,

4} , Jiaxiong Chen _{1,

2,

3,

4,

10} , Ming Zhang _{4,

11,

12,

13} , Caijun Zheng _{4,

11,

12,

13} , Shiyun Xiong _{1,

2,

3,

4} , Xuemei Ou _{1,

2,

3,

4} , Jia Yu _{1,

2,

3,

4} , Jiansheng Jie _{1,

2,

3,

4} , Chun-Sing Lee _{4,

10,

14,

15} , Chihaya Adachi _{5,

6,

7,

8,

9} , Xiaohong Zhang _{1,

2,

3,

4}

Affiliation

Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices
Soochow University
Suzhou
P. R. China
Center for Organic Photonics and Electronics Research (OPERA) and Department of Applied Chemistry
Kyushu University
Fukuoka 819-0395
Japan
JST
Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry
School of Optoelectronic Information
University of Electronic Science and Technology of China (UESTC)
Chengdu
City University of Hong Kong
Hong Kong

Exploiting high-performance non-doped organic light-emitting diodes (OLEDs) is a step towards future commercial application requirements, but great challenges remain due to quenching related to intermolecular triplet interaction. In this work, a novel strategy of exploiting high-performance non-doped electroluminescence via tuning intermolecular hydrogen bonding is demonstrated. Suitable intermolecular hydrogen bonding enables formation of a 3D supramolecular framework, which not only evidently restricts the nonradiative process and suppresses the triplet exciton quenching caused by π–π stacking of triplets, but also favors the horizontal molecular orientations especially in their non-doped states. The non-doped OLED based on the thermally activated delayed fluorescence emitter mTPy-PXZ with such suitable intermolecular hydrogen bonds exhibits the state-of-the-art performance with maximum external quantum efficiency of up to 23.6% with only 7.2% roll-off at 1000 cd m⁻². Moreover, it is the first report that the performance of an OLED with a non-doped emitting layer can surpass its corresponding optimized doped device. It is believed that this hydrogen bond-modulated mechanism can not only provide a new pathway for designing emitters for high-performance non-doped organic electroluminescence, but also has great potential in other solid-state luminescence applications.

中文翻译：

氢键调节分子堆积及其在高性能非掺杂有机电致发光中的应用

开发高性能非掺杂有机发光二极管（OLED）是迈向未来商业应用需求的一步，但是由于与分子间三重态相互作用相关的猝灭，仍然存在巨大挑战。在这项工作中，展示了一种通过调节分子间氢键来开发高性能非掺杂电致发光的新策略。合适的分子间氢键能够形成3D超分子骨架，这不仅明显限制了非辐射过程，并抑制了由三重π-π堆积引起的三重态激子猝灭，而且还有利于水平分子取向，特别是在其非掺杂状态下。非掺杂的OLED基于所述热活化延迟荧光发射米具有此类合适的分子间氢键的TPy-PXZ表现出最先进的性能，最大外部量子效率高达23.6％，在1000 cd m ^-2时仅滚降7.2％。此外，这是第一个报道，具有非掺杂发光层的OLED的性能可以超过其相应的优化掺杂器件。相信这种氢键调节机制不仅可以为设计用于高性能非掺杂有机电致发光的发射体提供新的途径，而且在其他固态发光应用中也具有巨大的潜力。

更新日期：2020-10-05

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