DOUBLE-HETEROSTRUCTURE ELECTROLUMINESCENT DEVICE WITH CYANINE-DYE BIMOLECULAR LAYER AS AN EMITTER

Using the Langmuir-Blodgett technique, we fabricated a double-heterostructure electroluminescent (EL) device with a J-aggregated cyanine-dye bimolecular layer as an emitting layer. The EL cells were composed of an indium tin oxide electrode, a diamine hole-transport layer, a J-aggregated cyanine-dye emitting layer, an oxadiazole electron-transport layer and an MgAg electrode. Efficient EL was observed in the EL device owing to the confinement of charge carriers and excitons within the cyanine-dye bimolecular layer. The EL spectrum corresponded well to resonance fluorescence of the J-aggregate.