Development of novel acceptors with deep LUMO energy levels

Abstract Pure-organic red exciplex emitters are far from satisfactory in terms of quantity and efficiency. The narrow lowest unoccupied molecular orbital (LUMO) energy levels range reported acceptors together with the intrinsic exciton non-radiative decay dominant factors restricting progress exciplexes. Herein, two acceptor molecules operating at unique LUMO -3.51 -3.56 eV, namely 4-(6-([1, 1’: 3’, 1”-terphenyl]-5’-yl)-1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl) benzonitrile (CNAI-tPh) 4-(6-(4-(4, 6-diphenyl-1, 3, 5-triazin-2-yl)phenyl)-1, 3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl) (CNAI-TRz), were developed. Through binding to a donor whose HOMO level is -5.53 CNAI-TRz-related OLEDs attained higher device efficiency amounting 7.7% red-shifted spectrum compared CNAI-tPh-related devices. These results remarkable among pure-organic exciplex-based demonstrate tremendous potential our synthesized efficient