Luminescent Chiral Exciplexes with Sky-Blue and Green Circularly Polarized-Thermally Activated Delayed Fluorescence |
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| Authors: | Patthira Sumsalee Dr. Laura Abella Sitthichok Kasemthaveechok Dr. Nicolas Vanthuyne Marie Cordier Dr. Grégory Pieters Prof. Jochen Autschbach Dr. Jeanne Crassous Dr. Ludovic Favereau |
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| Affiliation: | 1. Univ. Rennes, CNRS, ISCR – UMR 6226, 35000 Rennes, France;2. Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York, 14260 USA;3. Aix Marseille University, CNRS Centrale Marseille, iSm2, 13284 Marseille, France;4. Département Médicaments et Technologies pour la Santé (DMTS), SCBM, Université Paris-Saclay, CEA, INRAE, 91191 Gif-sur-Yvette, France |
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| Abstract: | Luminescent exciplexes based on a chiral electron donor and achiral acceptors are reported as a new approach to design circularly polarized (CP) and thermally activated delayed fluorescence (TADF) emitters. This strategy results in rather high CP luminescence (CPL) values with glum up to 7×10−3, one order of magnitude higher in comparison to the CPL signal recorded for the chiral donor alone (glum ∼7×10−4). This increase occurs concomitantly with a CPL sign inversion, as a result of the strong charge-transfer emission character, as experimentally and theoretically rationalized by using a covalent chiral donor-acceptor model. Interestingly, blue, green-yellow and red chiral luminescent exciplexes can be obtained by modifying with the electron accepting character of the achiral unit while keeping the same chiral donor unit. These results bring new (inter)molecular guidelines to obtain simply and efficiently multi-color CP-TADF emitters. |
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| Keywords: | exciplexes circularly polarized luminescence multi-colored emission thermally activated delayed fluorescence |
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