Highly efficient TADF OLEDs with low efficiency roll-off based on novel acridine–carbazole hybrid donor-substituted pyrimidine derivatives

Abstract

Dimethyl acridine (Ac) and carbazole (Cz) donors are fused to produce acridine–carbazole hybrid donors 12AcCz (8,8-dimethyl-5-phenyl-8,13-dihydro-5<italic>H</italic>-indolo[2,3-<italic>c</italic>]acridine) and 23AcCz (13,13-dimethyl-7-phenyl-7,13-dihydro-5<italic>H</italic>-indolo[3,2-<italic>b</italic>]acridine).