Materials that exhibit thermally activated delayed fluorescence (TADF) are heralded as next generation emitters for organic light-emitting diodes (OLEDs). TADF materials require small singlet-triplet energy gaps (ΔEST) to enable triplet harvesting, which is typically achieved through intramolecular charge transfer (ICT) states. Unfortunately, reducing the spatial overlap of the electron and hole wavefunctions causes a significant reduction in oscillator strength. Thus, a rapid reverse intersystem crossing (rISC) rate (krISC) often comes at the expense of a high photoluminescence quantum yield (PLQY, ΦPL) and a fast radiative rate (kr). For highly efficient and stable OLEDs the combination of high PLQY and large krISC is prized. Hence, new molecular design concepts to synergistically enhance PLQY and kr alongside krISC are of vital importance.