Título :	Triplet-to-singlet exciton transfer in hyperfluorescent OLED materials
Autor :	Sousa, Leonardo Evaristo de Born, Larissa dos Santos Oliveira Neto, Pedro Henrique de Silva, Piotr de
metadata.dc.identifier.orcid:	https://orcid.org/0000-0002-5880-5325 https://orcid.org/0000-0002-8336-7718 https://orcid.org/0000-0002-4985-7350
metadata.dc.contributor.affiliation:	Technical University of Denmark, Department of Energy Conversion and Storage University of Brasilia, Institute of Physics University of Brasilia, Institute of Physics University of Brasilia, Institute of Physics University of Brasilia, Institute of Physics
Assunto::	Éxcitons Hiperfluorescentes Diodos emissores de luz orgânicos (OLEDs)
Fecha de publicación :	2022
Editorial :	Royal Society of Chemistry
Citación :	SOUSA, Leonardo Evaristo de et al. Triplet-to-singlet exciton transfer in hyperfluorescent OLED materials. Journal of Materials Chemistry C, [S. l.], n. 10, 4914, 2022. DOI: 10.1039/d1tc05596h.
Abstract:	Hyperfluorescent organic light-emitting diodes combine two kinds of dopants to maximize device efficiency: one molecule exhibiting thermally activated delayed fluorescence (TADF) and another molecule with a high fluorescence rate and narrow emission spectrum. The postulated role of a TADF sensitizer is to enable upconversion of triplet to singlet excitons through the reverse intersystem crossing mechanism, which is followed by a Fo¨rster energy transfer to the fluorescent emitter. However, a second mechanism based on the direct triplet-to-singlet exciton transfer between TADF molecules is a priori possible, but its role in hyperfluorescence has not been investigated. Here we employ first-principles electronic-structure and kinetic Monte Carlo simulations to study the hyperfluorescence mechanism in four pairs of TADF/fluorescent emitters. We demonstrate how the triplet-to-singlet energy transfer mechanism is, in some cases, the main driver for the quantum efficiency boost observed in hyperfluorescent devices.
metadata.dc.description.unidade:	Instituto de Física (IF)
DOI:	10.1039/d1tc05596h
metadata.dc.relation.publisherversion:	https://pubs.rsc.org/en/content/articlelanding/2022/tc/d1tc05596h
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