The exploitation of para-disposed functional groups to generate p-extended skeletons is a powerful strategy to tune the photophysical properties of MR-TADF emitters to the red. Yasuda and co-workers have adopted this strategy where both the B-π-B and N-π-N-based groups are para-linked to construct red MR-TADF emitters such as BBCz-R (Figure ) that exhibits a λPL of 615 nm and a narrow FWHM of 21 nm (0.07 eV) in dilute toluene solution. This strategy has also been used to generate B/O and B/S derivatives as shown in Figure . Remarkably, among the many MR-TADF emitters reported, comprehensive studies on compounds containing para-C=O-π-C=O and N-π-N frameworks have not as of yet been presented. In this context, expanding the chemical space explored in ketone-based MR-TADF emitters is desired.