Characteristics of organic electroluminescent devices with new dopants

We conducted an investigation of electroluminescent (EL) characteristics of the organic EL devices with new dopants: 5,12-diphenyl-tetracene (DPT) and benzothioxanthene (BTX) derivatives. The organic EL cell doped with DPT showed a green emission with high color purity and also good operational stability. Concentration quenching was found out to be more severe for DPT, compared with rubrene. BTX derivatives exhibited an orange emission as a dopant both in the electron-transporting layer and in the hole-transporting layer. We demonstrated a white emission by the combination of an orange-emitting hole transport layer and a blue-emitting layer.