Bright red light-emitting organic electroluminescent devices having a europium complex as an emitter

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Abstract
Organic electroluminescent (EL) devices with a trivalent europium (Eu) complex as an emitter were fabricated. Triple‐layer‐type cells with a structure of glass substrate/indium‐tin oxide/ triphenyldiamine derivative (TPD)/Eu complex: 1,3,4‐oxadiazole derivative (PBD)/aluminum complex (Alq)/Mg:Ag exhibit bright red luminescence upon applying dc voltage. The EL spectrum consists of extremely sharp emission bands, which is a typical luminescence spectrum of the Eu complex. Luminance of 460 cd/m2 with an emission peak at 614 nm is achieved at a drive voltage of 16 V. This is the highest luminance so far obtained for the EL cells having a Eu complex as an emitter.