Authors
Tianjiao Fan, Qiwei Liu, Yang Xiao, Dongdong Zhang, Lian Duan
Published in
Angewandte Chemie (International ed. in English). Pages e5708575. Jul 10, 2026. Epub Jul 10, 2026.
Abstract
Multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters are a research focus for organic light-emitting diodes (OLEDs) targeting ultra-high-definition displays. Expanding the multi-resonance plane through multi-boron structures enables emission color tuning and spectral narrowing, which rigid indolocarbazole moieties could further reinforce. However, excessive expansion of conjugated aromatic planes leads to severe aggregation-caused quenching (ACQ). Herein, we combined the spirofluorene-based multi-resonance skeleton with indolocarbazoles as the bridging unit to construct a double-boron architecture, aiming to utilize the three-dimensional spatial rigidity of spirofluorene while suppressing intermolecular interactions in aggregated states. Three isomeric emitters were thereby obtained, with emission maxima at 524-565 nm. All emitters exhibit full widths at half-maximum below 20 nm, with the narrowest being 17 nm, and these emitters maintain narrow-band emission even at a high doping concentration of 6 wt%, where film spectral broadening is limited to within 3 nm. OLEDs based on these emitters display narrow bandwidths of 22-26 nm, the highest maximum EQE of 36.2%, and low efficiency roll-off, corresponding to a high EQE of up to 30.2% even under ultra-high luminance of 5 × 104 cd m-2. This work confirms the feasibility of spirofluorene-modified multi-boron large-plane multi-resonance emitters and provides a reliable molecular design strategy for narrowband OLEDs.
PMID:
42429083
Bibliographic data and abstract were imported from PubMed on 10 Jul 2026.
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