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Dithia[3.3]paracyclophane Core: A Versatile Platform for Triplet State Fine‐Tuning and Through‐Space TADF Emission
Author(s) -
Auffray Morgan,
Kim Dae Hyeon,
Kim Jong Uk,
Bencheikh Fatima,
Kreher David,
Zhang Qisheng,
D'Aléo Anthony,
Ribierre JeanCharles,
Mathevet Fabrice,
Adachi Chihaya
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201900401
Subject(s) - intersystem crossing , intramolecular force , singlet state , fluorescence , photon upconversion , acceptor , materials science , core (optical fiber) , photochemistry , nanotechnology , chemistry , optoelectronics , physics , luminescence , excited state , optics , atomic physics , stereochemistry , condensed matter physics , composite material
Thermally activated delayed fluorescence (TADF) based on through‐space donor and acceptor interactions constitute a recent and promising approach to develop efficient TADF emitters. Novel TADF isomers using a dithia[3.3]‐paracyclophane building block as a versatile 3D platform to promote through‐space interactions are presented. Such a 3D platform allows to bring together the D and A units into close proximity and to probe the effect of their orientation, contact site and distance on their TADF emission properties. This study provides evidence that the dithia[3.3]paracyclophane core is a promising platform to control intramolecular through‐space interactions and obtain an efficient TADF emission with short reverse‐intersystem crossing (RISC) lifetimes. In addition, this study demonstrates that this design can tune the energy levels of the triplet states and leads to an upconversion from 3 CT to 3 LE that promotes faster and more efficient RISC to the 1 CT singlet state.