This film showed TADF activity, as corroborated by the small singlet-triplet energy gap (ΔEST = 0.15 eV) and a delayed emission component with a lifetime of 40.9 μs. We also fabricated OLED devices using 9 (Fig. ). Electrical excitation of the film afforded green emission (CIE: x, y = 0.23, 0.58) with a maximum external quantum efficiency (EQEmax) of 5.4%. High EQE values, i.e., beyond 5%, are characteristic of TADF-active emitters. The g value of the CPL of 9 in solution is higher than those of previously reported TADF-active CPL-emitters , which emphasizes the advantage of employing a figure-eight structure for the design of practical CP-OLED materials.