Accurate and fast master equation modeling of triplet-triplet annihilation in organic phosphorescent emission layers including correlations

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Samenvatting

Triplet-triplet annihilation (TTA) in phosphorescent emission layers of modern organic light-emitting diodes
compromises their performance and device lifetime. TTA can occur by a Förster-type interaction between two
triplets, leading to a loss of one of them. The TTA process gives rise to correlations in the positions of the
surviving triplets, which complicate its study. These correlations can in principle be accounted for exactly in
kinetic Monte Carlo (KMC) simulations, but such simulations are computationally expensive. Here, we present
master equation modeling of TTA that accounts for correlations in a computationally efficient way. Cases without
and with triplet diffusion, which partly washes out correlations, are considered. We calculate the influence of
TTA on transient photoluminescence experiments, where it leads to a deviation from exponential decay, and on
steady-state emission efficiency. A comparison with KMC simulations shows that our master equation modeling
is an accurate and computationally competitive alternative.
Originele taal-2Engels
Artikelnummer085202
Aantal pagina's14
TijdschriftPhysical Review B - Condensed Matter and Materials Physics
Volume105
Nummer van het tijdschrift8
DOI's
StatusGepubliceerd - 15 feb. 2022

Financiering

This publication is part of the project “Master Equation Modeling of Organic Light-Emitting Diodes” (MEMOLED), with Project No. 17120, of the research programme “High Tech Systems and Materials” of the Netherlands Organization for Scientific Research (NWO). The project is jointly financed by NWO and Simbeyond B.V. We thank Stefano Gottardi, Harm van Eersel, and Marc Barbry from Simbeyond B.V. for interesting and intensive discussions about this work.

FinanciersFinanciernummer
Simbeyond B.V.
Nederlandse Organisatie voor Wetenschappelijk Onderzoek

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