Highly efficient exciplex organic light-emitting diodes using thermally activated delayed fluorescent emitters as donor and acceptor materials

Highly efficient exciplex type organic light-emitting diodes were developed using thermally activated delayed fluorescent emitters as donors and acceptors of an exciplex. Blue emitting bis[4-(9,9-dimethyl-9,10-dihydroacridine) phenyl] sulfone (DMAC-DPS) was a donor and 9,9'-(5-(4,6-diphenyl-1,3,5-triazin-2-yl)-1,3-phenylene) bis(9H-carbazole) (DDCzTrz) and 9,9', 9 ''-( 5-(4,6-diphenyl-1,3,5-triazin-2-yl) benzene-1,2,3-triyl) tris(9H-carbazole) (TCzTrz) were acceptor materials. The exciplexes of DMAC-DPS: TCzTrz and DMAC-DPS: DDCzTrz resulted in high photoluminescence quantum yield and high quantum efficiency in the green exciplex organic light-emitting diodes. High quantum efficiencies of 13.4% and 15.3% were obtained in the DMAC-DPS: DDCzTrz and DMAC-DPS: TCzTrz exciplex devices.