Wide-range color-tunable polycyclo-heteraborin multi-resonance emitters containing B–N covalent bonds. Issue 4 (6th January 2023)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Chemical science. Volume 14:Issue 4(2023)
• Page Start: 979
• Page End: 986
• Publication Date: 2023-01-06
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2sc06343c
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : A new set of BN-MR emitters based on the para B–π–B skeleton have been developed and showed impressive EQEs with low efficiency roll-offs and extended operation stability. Abstract : 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–π–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.