The molecular design of deep red and NIR TADF emitters typically involves: 1) the use of strong D and A motifs to create shallow HOMO and deep LUMO levels for the D and A units, respectively, and 2) rigid D-A structures to limit nonradiative decay pathways. For most of the reported NIR TADF molecules, derivatives of pyrazine, boron-nitrogen compounds, and difluoroboron compounds, have been used as acceptor groups, whereas derivatives of triarylamine moieties, phenazine, phenothiazine, and phenoxazine (PXZ) have been employed as donors. Among several reported nitrogen-doped polycyclic aromatic hydrocarbons (N-PAHs), dibenzo [a,c]phenazine (BP) has been one of the most popular for achieving orange-to-red emission (Figure ).