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Luminescent Chiral Exciplexes with Sky‐Blue and Green Circularly Polarized‐Thermally Activated Delayed Fluorescence
Author(s) -
Sumsalee Patthira,
Abella Laura,
Kasemthaveechok Sitthichok,
Vanthuyne Nicolas,
Cordier Marie,
Pieters Grégory,
Autschbach Jochen,
Crassous Jeanne,
Favereau Ludovic
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202102765
Subject(s) - luminescence , fluorescence , photochemistry , electron donor , electron acceptor , materials science , electron , acceptor , chemistry , optoelectronics , physics , optics , organic chemistry , quantum mechanics , condensed matter physics , catalysis
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 g lum up to 7×10 −3 , one order of magnitude higher in comparison to the CPL signal recorded for the chiral donor alone ( g lum ∼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.