Individually Tunable Energy Levels of Oligomers Based on N−B←N Units

作者：Xiaoyu Zhu, Yingze Zhang, Junhui Miao, Jun Liu, Lixiang Wang · 发表于：Angewandte Chemie International Edition · 年份：2024 · DOI：10.1002/anie.202411023 · 被引用次数：11 · 研究领域：Perovskite Materials and Applications、Organic Electronics and Photovoltaics、Conducting polymers and applications

Abstract Opto‐electronic properties and device performance of organic semiconductors are mainly determined by energy levels of their frontier molecular orbitals, e.g. lowest unoccupied molecular orbital ( E LUMO ) and highest occupied molecular orbital ( E HOMO ) in the ground state, first singlet state ( E S1 ) and first triplet state ( E T1 ) in the excited state. These energy levels are always intricately intertwined. Herein, we report a series of monodisperse oligomers based on double B←N bridged bipyridine (BNBP) units. With the increasing number of repeating units, the oligomers exhibit gradually downshifted E LUMO and nearly unchanged E HOMO due to the different distribution of the frontier molecular orbitals of the oligomers. Moreover, the oligomers exhibit gradually decreasing E S1 and nearly unchanged E T1 because of the different contributions of the charge transfer component in the excited state. This work provides new insight into energy level tuning of organic semiconductors, which is important for high‐performance organic opto‐electronic devices.