Organic emissive materials have gained significant attention in view of their use in myriad applications from organic light-emitting diodes (OLEDs) to bioimaging , sensors , and organic lasers . Recently, the discovery that organic compounds that emit via thermally activated delayed fluorescence (TADF) could similarly to phosphorescent metal complexes harvest 100% of the electrically generated excitons to produce light has initiated a tsunami of research activity in OLEDs . Typically, TADF emitters comprised electron donor and acceptor moieties that are weakly electronically coupled, usually by means of a strong twisted conformation, that results in compounds having small singlet-triplet splitting energy (∆EST), which facilitates the reverse intersystem crossing (RISC) process than enables dark triplet excitons to be endothermally upconverted to the S1 state.