Multiresonant thermally actived delayed fluorescence (MR-TADF) materials show significant potential as emitters in organic light-emitting diodes (OLEDs) as they have the requisite narrowband emission to produce the required saturated colors for high-definition displays. Unlike conventional donor-acceptor (D-A) TADF emitters, the structural rigidity inherent in most MR-TADF emitters reduces geometric relaxation upon excitation, resulting in a narrowband emission. The disposition of electron-rich and electron-deficient groups within the polycyclic aromatic hydrocarbon skeleton produces an emissive excited state of short-range charge-transfer (SRCT) character where there is a small exchange integral reflected in the moderately small singlet-triplet energy gap, DEST, that enables TADF.