SCE, and a reduction potential (Ered) of -1.71 V vs. SCE, values that were obtained from the peaks of the corresponding differential pulse voltammogram. The corresponding HOMO and LUMO energies are -5.46 and -2.71 eV, and the DE value is calculated to be 2.75 eV. The similar HOMO energy compared to most of the emitters containing a regiosiomeric secondgeneration carbazole donor deondron-based emitters (HOMOs of -5.41, -5.40 eV for tBuCz3pTRZ, tBuCz3mTRZ and -5.41 eV for tBuCz2pTRZ, tBuCz2mTRZ, and tBuCz2m2pTRZ ), and almost the same LUMO energy as that of Cz-SCz (LUMO of -2.74 eV) indicates that the oxidation occurs on the central carbazole of the second-generation carbazole donor, while reduction occurs on the B-N core.