On the other hand, examples of deep-blue MR-TADF emitters satisfying the industry standard for high-definition displays i.e., the BT.2020 standard are still limited; indeed, the blue devices must emit at Commission Internationale de l'Éclairage (CIE) coordinates of CIEx,y = (0.131, 0.046). In the literature, the strategy of fusing aromatic tertiary amines with boron atoms has been widely used to construct deep-blue MR-TADF emitters. This approach has also been modified by replacing the nitrogen atoms with other heteroatoms, and/or by replacing the often used diphenylamine (DPA) moieties with carbazole to achieve color and emissivity control. Previously, we reported the deep blue emitters 1B-DTACrs and 2B-DTACrs (Table ) wherein the devices emitter with CIEy ≤ 0.05. 11 1B-DTACrs showed near unity ΦPL of 99% but was not TADF, while 2B-DTACrs was TADF, with a fast RISC rate constant (kRISC ~ 10 5 ); however, the ΦPL was lower at 64%. In this study, we replaced the DTA with carbazole (Cz) and designed and synthesized two deep-blue MR-TADF emitters, 1B-CzCrs and 2B-CzCrs (Table ). The optoelectronic properties of the two deep-blue MR-TADF emitters were studied in detail, supported by computations. Interestingly, compared to the previously reported DPAbased 1B-DTACrs, the carbazole-containing 1B-CzCrs is TADF, as is 2B-CzCrs. 1B-CzCrs and 2B-CzCrs emit at lPL of 446 and 441 nm, with FWHM of 25 and 19 nm in toluene, respectively and the asymmetric 1B-CzCrs showed better TADF properties.