respectively. The presence of a delayed fluorescence suggests that at least some emitter molecules adopt an orthogonal conformation, as to allow for TADF. Compared to the data obtained in toluene (tp of 44.0 ns and td of 1.5 µs), DMAC-py-TRZ possesses a shorterlived prompt component and a slightly longer-lived delayed component. We then investigated the photophysics in mCP (1,3-bis(N-carbazolyl)benzene) as the host matrix, a suitable high triplet energy host for both compounds that would be relevant for OLEDs.