Light-emitting materials that can convert non-emissive triplet states into emissive singlet states are crucial in organic light-emitting diodes (OLEDs) as, statistically, 75% of the excited states formed in an OLED are triplet states. TTA materials are well suited to use in OLEDs due to their low operational voltage, small drop-off in efficiency when increasing brightness, and low cost. However, most TTA materials emit photons that are blue to deep blue, which limits their applications in OLEDs until the colour variety diversifies.