The S1/T1 energies, determined from the onsets of the steady-state PL and delayed emission spectra at 77 K in the 2 wt% doped films in mCP, are 2.58/ 2.40 eV, resulting in a DEST of 0.18 eV (Figure ), a value that is similar to that measured in 2-MeTHF glass. Temperature-dependent transient PL decay analysis reveals the expected increase in the delayed emission with increasing temperature, which confirms TADF in the 2 wt% doped film in mCP (Figure ). The emission decays with associated average prompt (τp) and delayed (τd) lifetimes are 5.6 ns and 188 µs (Figure and Table ), respectively.