To obtain efficient rISC, a narrow ΔEST is required. A large spin-orbit coupling is also essential, and is achieved through introducing a manifold of partially delocalised triplet states of both locally-excited (LE) and charge-transfer (CT) character. Structurally, this has translated to ICT molecules built up of numerous weakly coupled chromophores, conjugated through twisted bonds and/or cross conjugation. Prominent examples are 5Cz-TRZ and TAT-3DBTO2 reported by Cui, Chen, Adachi and Friend et al. and by Bryce, Monkman and coworkers, 5 respectively (Figure ). Homoconjugation (through-space conjugation) is a weak form of electronic communication distinct from conventional through-bond conjugation. Homoconjugation has recently received significant attention, mediating communication between donor and acceptor moieties to introduce efficient through-space charge-transfer-TADF (TSCT-TADF), including triptycene-based structures. Triptycene is an archetypal homoconjugated hydrocarbon. The π-systems of the three "fins" are separated by the saturated sp 3 bridgehead carbon and cannot communicate through-bond. However, the rigid conformation of triptycene facilitates trans-annular through-space overlap between their π-systems (Figure ).