It therefore becomes clear that to enhance gPL requires a combination of higher |m| and lower |μ| and a parallel arrangement between them. Unfortunately, the planar geometries of most MR-TADF materials, including MR-TADF helicenes, result in a nearly perpendicular arrangements between m and μ (Figure ), which result in low absolute values of cosq and low gPL values of < 3 × 10 -3 (Figure ). However, if two identical MR-TADF helicenes are fused into one C2-symmetric dimer molecule, the integrated μ and m of the dimeric emitter would be parallel or anti-parallel to each other (Figure ). A large cosq value of 1 would certainly contribute to a higher gPL value. Based on this strategy, in particular, Guo et al. developed