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20 August 2020 On the nature of the singlet and triplet excitations mediating thermally activated delayed fluorescence
Yoann Olivier
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Proceedings Volume 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX; 1146414 (2020) https://doi.org/10.1117/12.2569383
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
Thermally Activated Delayed Fluorescence (TADF) process is the new paradigm for Organic Light-Emitting Diodes. Still, a complete mechanistic understanding of TADF materials is not yet uncovered. It arises partially from the dichotomy between the need for small energy difference between the lowest singlet and triplet excited states (dEST) which have to carry a significant charge transfer (CT) character and for a significant spin-orbit coupling which requires these excited states to have different natures. In this contribution: (i) We will demonstrate that, the electronic excitations involved in the TADF process have a mixed CT-locally excited character being dynamically tuned by vibrational modes which assist upconversion and light emission. (ii) We will show, unlike conventional TADF emitters, how color purity, small dEST and high photoluminescence quantum yield in boron-centered azatriangulene-like molecule is achieved and how a negative dEST is obtained for these compounds.
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Yoann Olivier "On the nature of the singlet and triplet excitations mediating thermally activated delayed fluorescence", Proc. SPIE 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX, 1146414 (20 August 2020); https://doi.org/10.1117/12.2569383
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KEYWORDS
Luminescence
Organic light emitting diodes
Chromophores
Molecules
Oscillators
Polarization
Quantum efficiency
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