Zysman-Colman and co-workers recently reported a systematic study that documented explicitly in the PL spectrum emission from a TSCT in the compound TPA-ace-TRZ (Figure ). This work provides a direct evidence that the TSCT plays a major role in the communication between the donor and acceptor. The photophysical studies in toluene of TPAace-TRZ show two characteristic lifetimes corresponding to the fast-decaying through-bond CT (TBCT) state (τPL = 9.6 ns ) and longer-lived TSCT state (τPL = 51 ns). The existance of the two different CT states was ascribed to rapid decay from the initially populated TBCT state (with moderate D-A dihedral angles of 48° between the TPA and ace units and 57° between the ace and TRZ units) to the more stable TSCT state. The ΦPL of TPA-ace-TRZ was measured to be only 17%, which is due to the weak electronic communication between the donor and aceeptor through the ace bridge (the ace unit is orthogonal and electronically decoupled from both D and A groups). It was found the the lowest-energy triplet state resides on the ace bridge, which also leads to a large ΔEST of 0.48 eV (determined in 1 wt% ZEONEX film). The weak electronic communication makes it difficult for the triplet harvesting through the spin-vibronic coupling mechanism because the potentially mediating local triplet state resides on the ace bridge, which is orthogonal to both D and A and thus cannot efficiently couple to the TSCT state. Therefore, even though TPA-ace-TRZ possesses a strong TSCT state, it can hardly produce TADF because of the lack of coupling to a mediating LE triplet state. This study reveals the intimate interplay that the bridging ace group has on mediating both the TBCT state and the TSCT state. Wang et al. incorporated TSCT states in the design of two star-shaped TADF emitters, containing DMAC (Ac3TRZ3) or a dendritic teracridan (TAc3TRZ3) as donors and TRZ as acceptors about a hexaphenylbenzene scaffold (Figure Wang et al. also prepared a series of blue TADF polymers that exploit only TSCT to electronically couple donor and acceptor moieties (Figure ). The polymers use a nonconjugated polyethylene backbone, 9,9-dimethyl-10-phenyl-acridan (Ac) or 9,9-bis(1,3-ditert-butylphenyl)-10-phenyl-acridan (TBAc) as the donor pendant and TRZ as the acceptor pendant. In this design, D and A units are not directly electronically decoupled, but are spatially close to each other, allowing through-space, rather than the through-bond charge transfer processes to occur. The TSCT character observed from the Ac-based polymer results in both a small ΔEST of 0.019 eV and moderate FPL of 60% in the neat film. In comparison, the TBAcbased polymers only exhibited fast prompt fluorescence emission without TSCT contribution because the steric 1,3-dibutylphenyl groups separate the electron-donating acridan unit from the electron-accepting triazine unit, which weakens the TSCT transition. The device with a polymer consisting of 95 mol% Ac and 5 mol% TRZ content demonstrated the best device performance with CIE coordinates of (0.18, 0.27) and an EQEmax of 12.1%. The optoelectronic properties of the aforementioned materials are summarized in Table and the device performance metrics are summarized in Table . Circularly polarized luminescence (CPL) materials have attracted great attention due to their potential applications in optical data storage, chirality sensing, organic electronic devices and bio imaging. In 1997, Meijer et al. developed the first example of a circularly polarized OLED (CP-OLED). Since then, many chiral emitters have been explored, including chiral polymers, chiral phosphorescent complexes and chiral TADF small molecules. Of the latter, there are a few examples of chiral TADF emitters incorporating a triazine acceptor.