P‐182: Universal Host o‐DiCbzBz for High Efficiency Phosphorescence and Thermal Active Delayed Fluorescence Organic Light Emitting Device

A bipolar compound, o‐DiCbzBz, was synthesized conjugating two hole transporting moieties carbazole (Cbz) with an electron transporting moiety benzimidazole (Bz). Employing as a universal host doped with red, green, blue phosphorescence (PH) and thermal active delayed fluorescence (TADF) emitter to be the emitter layer inside organic light emitting diodes, devices exhibited an excellent efficiency performance, especially an excellent external quantum efficiency (η EQE ) of 31.8% with PH FIrpic and a high η EQE of 26.3% with TADF 4CzIPN