Tetraboron MR framework with ortho -B- π -B pattern enables high-efficiency yellow narrowband OLEDs

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ID: 318528
2026
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Abstract
Abstract Multiple resonance (MR) frameworks with ortho-boron-π-boron (B-π-B) patterns are promising alternatives to those with para-B-π-B ones for realizing bathochromic narrowband emission, but such cases have been rarely reported, and suffer from significant synthetic challenges. Here, a novel tetraboron MR framework ICZ4B incorporating an ortho-B-π-B pattern was constructed by using indolo[2,3-c]carbazole as the central building block. The well-defined borylation active sites facilitate an efficient one-shot quadruple borylation. ICZ4B not only exhibits bright yellow emission with a small full width at half maximum of 24 nm, but also achieves an improved reverse intersystem crossing (RISC) rate of 4.7 × 104 s−1. The non-sensitized device realizes an outstanding external quantum efficiency of 36.5%, representing one of the highest results at long wavelengths. This study not only presents a feasible pathway for realizing MR frameworks with ortho-B-π-B patterns via delicate selection of key precursors, but also offers insights for optimizing synthetic strategies for complex MR frameworks.
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Authors Xicheng Zhang, Yongliu Yang, Zhangli Cheng, TongYuan Zhang, Jie Li, MoYuan Li, Jia Yu, Xiaochun Fan, Kai Wang, Xiaohong Zhang
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Journal national science review
Year 2026
DOI
10.1093/nsr/nwag389
URL
https://doi.org/10.1093/nsr/nwag389
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