Triplet-to-Singlet Exciton Transfer in Hyperfluorescent OLED materials

23 August 2021, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


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 up-conversion of triplet to singlet excitons through the reverse intersystem crossing mechanism, which is followed by a Förster 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.


Förster energy transfer
Multiscale simulations

Supplementary materials

Supporting Information for Triplet-to-Singlet Exciton Transfer in Hyperfluorescent OLED materials
Supporting Information fo Triplet-to-Singlet Exciton Transfer in Hyperfluorescent OLED materials


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