Abstract: After an introduction to organic light-emitting diodes, we will discuss our recent computational work dealing with three strategies to design efficient, purely organic emitters:
The first strategy was introduced in 2012 by Chihaya Adachi and co-workers at Kyushu University, who proposed to harvest the triplet excitons in purely organic molecular materials via thermally activated delayed fluorescence (TADF). These materials now represent the third generation of OLED emitters. Impressive photo-physical properties and device performances have been reported, with internal quantum efficiencies reaching 100% (which means that, for each injected electron, one photon is emitted). In the most efficient materials, the TADF process has been shown to involve several singlet and triplet excited states.
A second strategy, which has been applied more recently, was proposed by Feng Li and co-workers at Jilin University in 2015 and is based on the exploitation of stable organic radicals. In these materials, where the lowest excited state and the ground state usually belong both to the doublet manifold, we will describe how high efficiencies and photo-stability can be obtained.
Finally, we will briefly discuss our very recent work on so-called multi-resonance (MR) TADF materials, initially developed by Takuji Hatakeyama and co-workers at Kwansei Gakuin University.
Bio: Jean-Luc Brédas received his B.Sc. (1976) and Ph.D. (1979) degrees from the University of Namur, Belgium. In 1988, he was appointed Professor at the University of Mons, Belgium, where he established the Laboratory for Chemistry of Novel Materials. While keeping an “Extraordinary Professorship” appointment in Mons, he joined the University of Arizona in 1999. In 2003, he moved to the Georgia Institute of Technology where he became Regents’ Professor of Chemistry and Biochemistry and held the Vasser-Woolley and Georgia Research Alliance Chair in Molecular Design. Between 2014 and 2016, he joined King Abdullah University of Science and Technology (KAUST) as a Distinguished Professor and served as Director of the KAUST Solar & Photovoltaics Engineering Research Center. He returned to Georgia Tech in 2017 before moving back to the University of Arizona in 2020. Prof. Brédas is an elected Member of the International Academy of Quantum Molecular Science, the Royal Academy of Belgium, and the European Academy of Sciences. He is the recipient of the 1997 Francqui Prize, the 2000 Quinquennial Prize of the Belgian National Science Foundation, the 2001 Italgas Prize, the 2003 Descartes Prize of the European Union, the 2010 ACS Charles Stone Award, the 2013 APS David Adler Award in Materials Physics, the 2016 ACS Award in the Chemistry of Materials, the 2019 Alexander von Humboldt Research Award, the 2020 MRS Materials Theory Award, and the 2021 RSC Centenary Prize. He has served as editor for Chemistry of Materials between 2008 and 2021 and scientific editor for Materials Horizons since 2022. His current Google Scholar h-index is 171.
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