New paper: What happens, when you push on TADF-type exciplex systems?

In a new paper – Spin-dependent charge transfer state design rules in organic photovoltaics –  published in Nature Communications, we probe intermolecular charge transfer states with the aid of their luminescent thermally activated delayed fluorescence  (TADF) channel. In addition to probing this TADF with time-resolved photoluminescence alone, we examine the dynamics of the system under a variation of the electron and hole spacing of the CT states, controlled through external pressure. The comparison of two different acceptor molecules with either low or high local triplet energies directly shows the significance of the careful energetic design of charge separating interface in organic photovoltaics. Here, a low lying triplet level on the acceptor significantly quenches the CT triplet states, increasing the overall recombination losses.