B–N bond-doped multiple resonance emitter with extended π-conjugation for narrowband sky-blue OLED exhibiting low efficiency roll-off

Abstract

Incorporating B–N covalent bonds into the classic boron–nitrogen multiple resonance (B,N-MR) skeleton within a polycyclic heteroaromatic framework presents an effective approach for developing novel narrowband MR emitters. In this study, the synthesis process was simplified using a lithium-free one-pot borylation reaction, yielding a narrowband MR emitter, ICz[B-N], featuring an indolocarbazole segment to extend π-conjugation and induce a redshifted emission. The para-positioned nitrogen–π–nitrogen conjugation in the indolocarbazole segment exhibits enhanced electron-donating ability relative to the traditional carbazole moiety, while the rigidly extended MR backbone enables both spectral redshift and narrowband emission. The synthesized ICz[B-N] displayed sky-blue emission at 488 nm, representing a 42 nm redshift relative to the B,N-MR blue emitter doping with B–N bond, while maintaining a narrow spectral linewidth of only 19 nm. The corresponding sensitized OLED device achieved a peak brightness exceeding 70000 cd m⁻², an external quantum efficiency of 15.0%, and minimal efficiency roll-off.

Supplementary files

Article information

Article type
Paper
Submitted
13 May 2025
Accepted
29 Jun 2025
First published
12 Jul 2025

J. Mater. Chem. C, 2025, Accepted Manuscript

B–N bond-doped multiple resonance emitter with extended π-conjugation for narrowband sky-blue OLED exhibiting low efficiency roll-off

J. Zhou, H. Zhang, Q. Wang, D. Wan, G. Meng, D. Zhang and L. Duan, J. Mater. Chem. C, 2025, Accepted Manuscript , DOI: 10.1039/D5TC01905B

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