4.6 Article

Triplet-to-singlet exciton transfer in hyperfluorescent OLED materials

期刊

JOURNAL OF MATERIALS CHEMISTRY C
卷 10, 期 12, 页码 4914-4922

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc05596h

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资金

  1. VILLUM FONDEN [00028053]
  2. Brazilian Research Councils CNPq
  3. CAPES
  4. FAPDF

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Hyperfluorescent organic light-emitting diodes use two kinds of dopants to improve device efficiency. The triplet-to-singlet energy transfer mechanism is found to be the main factor driving the increase in the quantum efficiency of hyperfluorescent devices in certain cases.
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 Forster 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.

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