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Amine-directed Formation of B–N Bonds for BN-fused Polycyclic Aromatic Multiple Resonance Emitters with Narrowband Emission
2022-06-29 16:30

清华大学段炼团队报道了BN融合窄带多环芳香族多共振发射体B–N键的胺定向形成。相关研究成果发表在2022年6月24日出版的国际知名学术期刊《德国应用化学》。

尽管硼和氮原子相互对位的有机纳米石墨烯具有显著的多重共振(MR)光电特性,但合成过程复杂,产率低,分子骨架有限。

该文中,研究人员通过胺定向形成B-N键来简化多硼化反应,同时引入额外的对位氮原子来触发MR效应,构建了一种易于获得MR发射体的新范式。概念验证分子在480和490 nm处呈现窄带发射,半最大值处的全宽(FWHMs)仅为29和34 nm。基于它们的器件显示出外部量子效率(EQE)值>33.0%,即使在5000 cd m-2的高亮度下,也仍然超过24.0%。这是第一个具有B-N共价键的MR发射器的例子,不仅降低了合成难度,而且增加了MR骨架的多样性,以获得新的光电特性。

附:英文原文

Title: Amine-directed Formation of B–N Bonds for BN-fused Polycyclic Aromatic Multiple Resonance Emitters with Narrowband Emission

Author: Guoyun Meng, Hengyi Dai, Tianyu Huang, Jinbei Wei, Jianping Zhou, Xiao Li, Xiang Wang, Xiangchen Hong, Chen Yin, Xuan Zeng, Yuewei Zhang, Dezhi Yang, Dongge Ma, Guomeng Li, Dongdong Zhang, Lian Duan

Issue&Volume: 2022-06-24

Abstract: Despite the remarkable multiple resonances (MR) optoelectronic properties of  organic nanographenes  with boron and  nitrogen atoms disposed  para  to each other, the synthetic procedures are sophisticated with low yields and the molecular skeletons are limited. Here, a new paradigm of easy-to-access MR emitter is constructed by simplifying the  multiborylation  through the amine-directed formation of B-N bonds while introducing  an additional  para  -positioned nitrogen atom to trigger the MR effect  . The proof-of-the-concept molecules exhibit narrowband emissions at 480 and 490 nm, with full width at half maxima (FWHMs) of only 29 and 34 nm. The devices based on them showed external quantum efficiencies (EQE) values >33.0%, which remained to exceed 24.0% even at a high brightness of 5000 cd m  2  . This is the first example of MR emitters with B-N covalent bond, not only decreasing the synthesis difficulty but also increasing the diversity of MR skeletons for emerging new optoelectronic properties.

DOI: 10.1002/anie.202207293

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202207293

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