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张晓宏教授、陈先凯教授与王凯副教授合作在Adv. Funct. Mater.上发表论文
发布时间:2024-04-23 点击:427

题目:

Enhancing Reverse Intersystem Crossing of Multiple Resonance Type Thermally Activated Delayed Fluorescence Emitter by Introducing Spatial Perturbation

作者:

Xin Xiong1, Jia-Qi Li1, Ting-Feng Chen1, Xiao-Chun Fan1, Ying-Chun Cheng1, Hui Wang1, Feng Huang1, Hao Wu1, Jia Yu1, Xian-Kai Chen1,2*, Kai Wang1,3* and Xiao-Hong Zhang1,2*

单位:

1Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren-Ai Road, Suzhou 215123, China

2Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University Suzhou, Jiangsu 215123, P. R. China

3Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Suzhou, Jiangsu 215123, P. R. China

摘要:

For multiple resonance (MR) type thermally activated delayed fluorescence (TADF) emitters, electron cloud distributions of their π-conjugated planes are crucial for determining their eventual performance. Currently, modulation attempts of MR-TADF emitters are mainly inside the π-conjugated planes. Possible out-of-plane interactions may also significantly impact the photophysical properties, but the exploration is quite limited. Here, a novel concept of using out-of-plane (e.g., π–π and lone pair-π) interactions to introduce spatial perturbation (SPPT) to improve TADF performance is proposed. Two newly developed MR-TADF emitters, namely,o-BNPOandBNPO, which both consist of a popular MR framework,DtBuCzB, and diphenylphosphine oxide (DPPO), are compared in depth. In particular, foro-BNPO, evident π–π interaction is observed between one side of theDtBuCzBπ-conjugated plane and a phenyl ring fromDPPO, and lone pair-π interaction with the oxygen atom fromDPPOis noticed on the other side, resulting in significantly accelerated reverse intersystem crossing and better TADF without sacrificing narrowband emission features. Ultimately, in organic light-emitting diodes with sensitizer-free emitting layers, both emitters achieve similar narrowband emissions, while theo-BNPO-based device demonstrates a much higher external quantum efficiency of 36% and milder efficiency roll-off.

影响因子:

19.924

分区情况:

一区

链接:

https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.202313726



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