In 2019, Zysman-Colman and co-workers introduced the carbazolophane (Czp) donor unit (indolo[2.2]paracyclophane) for the design of chiral TADF emitters, Rp-CzpPhTrz and Sp-CzpPhTrz (Figure ). The bulky carbazolophane donor unit increased the torsion between the donor and the phenylene bridge compared the control compound CzPhTrz (same structure as CzTRZ discussed in section 2). As discussed above, CzPhTrz was known to be a non-TADF compound; however, the larger torsion between the donor and the bridge in CzpPhTrz leads to a decreased ΔEST of 0.16 eV, which contributes to the turn on of the TADF. Reproduced with permission. Zheng et al. reported a pair of chiral TADF emitters (Figure ), Rp-5 and Sp-5, by combining a TRZ acceptor with a chiral donor group (PXZp). PXZp is a phenoxazine derivative containing an annulated [2.2]paracyclophane (pCp) skeleton which has ever been demonstrated as an efficient unit enabling a blue chiral TADF emitters by Zysman-Colman and co-workers in 2019. Similar to their analogue PXZ-TRZ (λPL: 540 nm; FPL: 66%; τd: permission . A pair of triptycene-based enantiomers, (S,S)-/(R,R)-TpAc-TRZ, were developed containing a triptycene-fused diacridine chiral donor (S,S)-/(R,R)-TpAc (Figure ). The lowering the temperature of the ITO glass from 300 K to 200 K. As a result, the EQEmax is improved from 9.6% at 300 K to 11.9% at 200 K. The use of PTZ as a donor introduces additional conformational dynamics due to the existence of two ground-state conformers resulting from puckering of the PTZ ring, each with their own associated DEST. PTZ-TRZ shows a slightly red shifted emission maximum (λPL: 562 nm;