Red-light-emitting organic electroluminescent devices with bisanil dye as emitter

Double-layer organic thin film electroluminescent (EL) devices having red e mission have been constructed using bisanil dyes. The basic structure of th e EL device consisted of a hole-transport layer and a luminescent layer bet ween the indium-tin-oxide (ITO) glass and magnesium electrodes. The hole-tr ansport layer was a N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4, 4'-diamine (TPD)-doped poly(N-vinylcarbazole) (PVK) film. The luminescent l ayer consisted of a host material, 8-hydroxyquinoline aluminum (Alq(3)), an d bisanil dye as the dopant. The full width at half maximum (FWHM) of the P L and EL spectra of two bisanil dyes is as narrow as 50nm. Among the two ma terials studied by us, the N,N'-bis[4-(N,N-dimethylamino)-benzylidene]diami nomaleonitrile (BAM) showed a better EL performance. A bright pure red ligh t with a peak at 620 nm and a maximum luminance of 6230 cd/m(2) was observe d.