(SE) band on the low energy edge of the GSB, aligning with their photoluminescence spectrum. The SE bands decay in all three materials with a fast time constant of around 6 ns, consistent with the trPL measurements and typical of a strongly allowed radiative transition (Figure .). We note that it is unusual to observe such an intense SE feature in the TA of TADF materials with long range CT character as they typically possess low oscillator strengths for the S1 transition. Though, it is worth pointing out that a class of TADF-active boron difluoride curcuminoid emitters has previously shown a strong SE feature in the TA, as well as ASE behaviour, which suggests that the pyrazine-based emitters studied here may be promising candidates for lasing applications.