Wide-range color-tunable polycyclo-heteraborin multi-resonance emitters containing B-N covalent bonds

作者：Meng, Guoyun; Dai, Hengyi; Zhou, Jianping; Huang, Tianyu; Zeng, Xuan; Wang, Qi; Wang, Xiang; Zhang, Yuewei; Fan, Tianjiao; Yang, Dezhi; Ma, Dongge; Zhang, Dongdong^*; Duan, Lian^*

来源：Chemical Science, 2023, 14(4): 979-986.

DOI：10.1039/d2sc06343c

• BLUE
• EFFICIENCY

Boron- and nitrogen (BN)-fused polycyclic aromatic frameworks with amine-directed formation of B-N covalent bonds have the potential to form a new family of facile-synthesis multi-resonance luminophores, which, however, still face imperative challenges in diversifying the molecular design to narrow the emission bandwidth and tune the emission colors. Here, we demonstrate a strategic implementation of B-N bond containing polycyclo-heteraborin multi-resonance emitters with wide-range colors from deep-blue to yellow-green (442-552 nm), small full-width at half-maxima of only 19-28 nm and high photoluminescence efficiencies, by stepwise modifying the basic para B-pi-B structures with heteroatoms. The corresponding electroluminescent devices show superior maximum external quantum efficiencies with an exceptional low-efficiency roll-off, retaining 21.0%, 23.6% and 22.1% for the sky-blue, green and yellow-green devices at a high luminance of 5000 cd m(-2), respectively.

• 单位
  清华大学