Abstract
Due to narrowband emission and high quantum efficiencies, polycyclic aromatic heterocycles with multi-resonance thermally activated delayed fluorescence (MR-TADF) properties have recently gained considerable attention in the organic optoelectronic field. Albeit their great promise in the full visible region covering from blue to red, MR-TADF emitters with ultraviolet emission have been rarely reported. Through locking the two ortho-positions of a triphenylamine core by sulfone groups, a simple polycyclic aromatic heterocycle, BTPT, was facilely constructed, exhibiting 368 nm ultraviolet emission with a narrow full width at half maximum (FWHM) of 33 nm. Its neat film exhibited distinct TADF property with a main emission peak at 388 nm. Noteworthily, the enantiomeric crystals of BTPT not only demonstrated significant circularly polarized luminescence (CPL) with large luminescence dissymmetry factor in the 10−3 order but also displayed obvious room temperature phosphorescence (RTP). The relationship between this innovative helical unit and unique photophysical properties, including ultraviolet MRTADF, CPL, and RTP, was reasonably revealed.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (52022071, 52130308, 91833304), the Fundamental Research Funds for the Central Universities (2042021kf1060), and Shenzhen Science and Technology Program (ZDSYS20210623091813040, JCYJ20190808151209557). The numerical calculations in this paper have been done on the supercomputing system in the Supercomputing Center of Wuhan University.
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Simple Sulfone-Bridged Heterohelicene Structure Realizes Ultraviolet Narrowband Thermally Activated Delayed Fluorescence, Circularly Polarized Luminescence and Room Temperature Phosphorescence
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Ning, W., Wang, H., Gong, S. et al. Simple sulfone-bridged heterohelicene structure realizes ultraviolet narrowband thermally activated delayed fluorescence, circularly polarized luminescence, and room temperature phosphorescence. Sci. China Chem. 65, 1715–1719 (2022). https://doi.org/10.1007/s11426-022-1318-9
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DOI: https://doi.org/10.1007/s11426-022-1318-9