The devices fabricated using even higher emitter doping concentrations ( The study implies that the TDM of TPA-tBu-DiKTa is indeed preferentially horizontally oriented with a ratio (Q) of 72.5%. This implies an improved light outcoupling efficiency that contributes to the high overall EQEmax of the devices as compared to devices with emitters that are almost randomly oriented, having lower Q (62%). The EQEmax of the OLEDs with TPA-tBu- reported LRCT dominated DiKTa-based TADF OLEDs with the TPA-tBu-DiKTa emitter (Table ) presented in this work (f) Photograph of the OLEDs fabricated with 2 wt% of TPA-tBu-DiKTa.