Organic light-emitting diode (OLED) technology enables thin, lightweight, flexible and highly efficient displays and lighting products that are not readily achievable with other technologies. Current research in OLED materials has mainly focused on the development of efficient purely organic thermally activated delayed fluorescence (TADF) emitters that show comparable exciton utilization efficiencies to commercially used yet unsustainable red-and green-emitting iridium(III) complexes and surpass those of blue, fluorescent compounds. TADF emitters can thermally up-convert non-emissive triplet excitons (T1) to emissive singlet excitons (S1) through reverse intersystem crossing (RISC), and the efficiency of this process is governed in part by the singlet-triplet energy gap, DEST, and the magnitude of the spin orbit coupling (SOC) between singlet and triplet states. According to El Sayed's rule, the transition between singlet and triplet states possessing the same nature is not efficient. A possible way to increase the SOC between the singlet and triplet manifolds in the compound is for RISC to proceed via intermediate triplet states of different character to S1, frequently of a stronger locally excited (LE) character, that can vibronically couple to T1. There are a small number of strategies documented that achieve a higher number of intermediate triplet states in donor-acceptor (D-A) TADF emitters, associated with a larger number of either donor or acceptor units. In principle, a higher number of repetitive units should result in a larger number of quasi-degenerate states that also produces a higher number of intermediate triplet states. One known design strategy to produce a system that possesses intermediate triplet states is based on a multi donor to a single acceptor system like poly(carbazole)-substituted benzonitrile (BN) derivatives. For example, Time-Dependent Density Functional Theory (TD-DFT) calculations predict that the number of intermediate triplet states increases from two to three when the number of donor carbazoles is increased from four in 2,3,5,6-tetra(9H-carbazol-9-yl)benzonitrile (4CzBN) to five in 2,3,4,5,6-penta-(9H-carbazol-9-yl)benzonitrile (5CzBN), Figure . This is reflected in experimentally faster RISC, kRISC, and smaller singlet triplet gaps, DEST, with increasing number of carbazole donors from DCzBN1 to 4CzBN and 5CzBN, while also attractively showing enhanced photoluminescence quantum yields, FPL. Another strategy to ensure a larger number of intermediate triplet states is to increase the number of donors and acceptor repeat units within a D-A main chain polymer. A rare example of such kind of a polymer was reported by Adachi and co-workers. While the group demonstrated solution-processed OLEDs that perform well using TADF-active polymers as emitters based on this design concept, the number of intermediate triplet states in their polymers was actually not investigated, neither theoretically nor experimentally through a photophysical study. Furthermore, this fine-tuning of the TADF-properties resulted in a strong red-shift of photoluminescence. To fine-tune the TADF-related parameters without invoking an undesired red-shift of the photoluminescence, here we present a new strategy to ensure a large number of intermediate triplet states is present in the emitter, resulting in fast kRISC. We report a family of D-A TADF emitters that have BN as the acceptor unit that are connected via the amine donors ortho to the nitrile acceptor, acting as bridges to adjacent BN acceptors (Figure ). Our reference emitter 4TABN1 is a ditolyl amine version of the previously reported carbazole-benzonitrile based DCzBN1, (a blue TADF emitter). The structural design of our longer emitters is reminiscent of an alternating donor-acceptor main chain polymer. In this report, we targeted blue emission in short donor-acceptor oligomers through the selection of tolylamine and BN moieties as weak D and A units, respectively. The number of donor units attached to a single BN motif is limited to two. The ortho substitution pattern of the donors translates to highly twisted conformations of the emitters, which should limit the interaction between hole and electron densities to ensure a small ΔEST. Furthermore, a highly twisted conformation should prevent charge delocalisation across the molecular structure and thus the undesired red-shift of the emission.