Triplet-triplet annihilation (TTA) gives rise to correlations in the positions of surviving excitons, which are ignored in the mean-field approximation of the master equation (ME). These correlations can in principle be accounted for exactly in Kinetic Monte Carlo (KMC) simulations, but these are computationally expensive. In this work, we present ME modeling of TTA that accounts for correlations. A comparison between our modeling and KMC simulations reveals the effect of correlations on the rates of radiative decay and TTA, and shows that our ME modeling is an accurate and computationally attractive alternative.
It is of utmost importance to understand the effects of exciton-polaron quenching (EPQ) in OLEDs, in order to be able to counteract its detrimental effects. In this work we provide a method for calculating Förster radii of EPQ processes in phosphorescent emitter-host films based on a combination of theoretical and experimental methods. We model absorption spectra using multi-scale ab initio methods. The emission spectra of emitters can still be obtained experimentally, allowing for accurate determination of the Förster EPQ radius. Using our method we have determined Förster radii for various emitter-host combinations prevalent in OLEDs.
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