Biluminescence promises to be a hugely important field because it possesses two distinct spectral bands with distinct lifetimes, oxygen dependence and, in the case of TADF/RTP biluminescence, contrasting temperature dependences. This enables a diverse range of applications, including: the simultaneous sensing of temperature and oxygen, data security and counterfeit protection, and white-light emitting OLEDs. As such, there is enormous value in both providing insight into this mechanism and in introducing new molecular-scaffolds that exhibit biluminescence. In particular, we note that there are no previous reports of a biluminescent MR-TADF/RTP emitter.