LEC comprises, by definition, mobile ions in its active material. In functional LECs, the external bias-induced redistribution of these ions results in injection-facilitating electric double layer (EDL) formation at the two electrode/active-material interfaces, followed by electrochemical doping of the luminescent organic semiconductor(s) in the active material; n-type at the negative cathode and p-type at the positive anode. The latter process concludes with the in-situ formation of a p-n junction doping structure in the active material. This intricate turn-on process enables LEC architectures to consist of solely air-stable and solution-processable materials, and it has been shown that such robust LEC devices can be fabricated by non-interrupted ambient-air printing and coating. This opportunity for material-and energy-efficient fabrication is desirable for costsensitive and sustainable electroluminescent devices, but it should be noted that the LEC performance is strongly dependent on the merits and combined function of the luminescent semiconductor and the mobile ions. For instance, it has recently been demonstrated that MR-TADF compounds can function as the luminescent organic semiconductor in LEC devices, but also that the propensity for ACQ can be highly detrimental to both the LEC-critical ion redistribution process and the emission efficiency. It is thus interesting and timely to investigate and compare the performance of LECs employing TPA-tBu-DiKTa and TPPO-tBu-DiKTa.