Future work must provide further analysis of the photophysical rates and vibrational contributions to develop molecules suitable as emitters. Non-alternant fused polycyclic hydrocarbons are a promising class of molecules that continue to attract attention for their antiaromatic and optical properties. The new molecular motifs we have suggested provide many potential avenues to explore. A combined synthetic and computational screening effort was successful in identifying a heptazine-based emitter with inverted gap and significant oscillator strength from the emissive S 1 state. The conceptual understanding of the relation between substituent effects and singlet-triplet gap inversion provides new knowledge of the underlying design rules. Future screening efforts for synthesizable inverted gap molecules must apply this understanding to optimize both the state-ordering and the oscillator strengths of the potential emitters.