Swager et al. reported a series of TADF emitters possessing a TSCT state. As shown in Lee et al. found that ortho-linked donor and acceptor compounds showed superior TADF properties to those where the donor was either meta-or para-disposed. The authors compared the optoelectronic properties of oBFCzTRZ, mBFCzTRZ and pBFCzTRZ, which are based on ortho-, meta-, and para-linked diphenyltriazine and benzofurocarbazole groups (Figure ).