Abstract
Chiral B,N-doped polycyclic aromatic hydrocarbons with circularly polarized luminescence (CPL) and small full-width at half-maxima (FWHM) are promising multiple resonance (MR) emitters for CP organic light-emitting diodes (CP-OLEDs). This work presents a pair of chiral MR enantiomers, P/M-o[B-N]2N2, featuring B-N bonds incorporated within a [7]-helicene skeleton. These enantiomers exhibit narrow 0–0 and 0–1 electronic transition bands, whose relative intensity can be fine-tuned by increasing doping concentrations, resulting in redshifts of the emission peak from 542 to 592 nm. The enantiomers show mirror-symmetric CPL spectra with an asymmetry factor (∣gPL∣) of 1.0 × 10−3. The hyperfluorescent CP-OLEDs with double-sensitized emitting layers display a FWHM of 33 nm, an external quantum efficiency of 25.1%, and a ∣gEL∣ factor of 7.7 × 10−4. Notably, the CP-OLEDs realize color-tunable CP electroluminescence peak from 553 to 613 nm by regulating the vibrational coupling. This work provides a novel concept for the design of helical CP-MR materials and CP-OLEDs, highlighting their potential for future applications in advanced optoelectronic devices.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (92256304, 21975119) and the China Postdoctoral Science Foundation (2022M710020).
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Supporting information The supporting information is available online at https://chem.scichina.com and https://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.
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Yuan, L., Tu, ZL., Xu, JW. et al. Color-tunable circularly polarized electroluminescence from a helical chiral multiple resonance emitter with B-N bonds. Sci. China Chem. 66, 2612–2620 (2023). https://doi.org/10.1007/s11426-023-1712-5
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DOI: https://doi.org/10.1007/s11426-023-1712-5