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

Authors

Shuqi Zhang, Yongliu Yang, Zhangli Cheng, Tongyuan Zhang, Jie Li, Moyuan Li, Jia Yu, Xiaochun Fan, Kai Wang, Xiaohong Zhang

Published in

National science review. Volume 13. Issue 16. Pages nwag389. Epub Jun 24, 2026.

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 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.

PMID:
42668809
Bibliographic data and abstract were imported from PubMed on 30 Aug 2026.

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