We report an ortho-B-π-B strategy enabling a long-wavelength MR-TADF material with suppressed molecular vibrations. The emitter QuBN shows yellow emission peaking at 552 nm with 20 nm FWHM and 91% quantum yield. Its OLED achieves an external quantum efficiency of 27.9%, which is boosted to 31.3% with reduced roll-off via phosphorescence sensitization.
T. Hua, Y. Hu, T. Jiang, X. Guo, C. Zhang, Z. Chen, J. Miao, C. Yang and Z. Huang, Chem. Commun., 2026, Accepted Manuscript , DOI: 10.1039/D6CC02248K
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