Organic electroluminescent devices

An organic electroluminescent (EL) device comprised, in the following sequence, of an anode, an organic hole injecting and hole transporting layer, an organic electron injecting and electron transporting layer, and a cathode, wherein said organic hole injecting and transporting layer is comprised of a mixture of a tertiary aromatic amine and a polycyclic aromatic hydrocarbon compound, and wherein said polycyclic aromatic compound is comprised of at least 2 aromatic rings and contains from about 10 to about 100 carbon atoms, and wherein said polycyclic aromatic hydrocarbon contains one or more substituents of an alkyl group having 1 to 8 carbon atoms, halogen, alkoxy, aryloxy, amino, dialkylamino, or diarylamino and wherein said polycyclic aromatic compound is selected from 1,4,5,12-tetraphenylnaphthacene, 1,4,5,8,9,10-hexaphenylanthracene, 1,4,9,10-tetraphenylanthracene, 9,10-diphenylanthracene, 1,2,3,4-tetraphenylnapthalene, 2,3,6,7-tetraphenylnaphthalene, 3,4-diphenylperylene, 3,4-diphenylbenzo[k]perylene, 3,4,9,10-tetraphenylperylene, 2,7-diphenyldibenzo[e,l]pyrene, dibenzo[e,l]pyrene, benzo[c]naphtho[2,1-p]chrysene, 2,3,6,11-tetraphenyltriphenylene, dibenzo[a,h]anthracene, 9,10-diphenyldibenzo[a,h]anthracene, benzo[a]pyrene, naphtho[b]pyrene, 6,6,13,13-tetraphenyl-6,13-dihydropentacene, hexaphenylbenzene, 2,2',7,7'-tetraphenyl-9,9'-spirobifluorene, p-quinquephenyl, coronene, pentacene, and 6,13-diphenylpentacene, and wherein said organic electron injecting and transporting layer is comprised of a luminescent layer comprised of an electron transporting component, and wherein the luminescent layer is doped with a fluorescent dye.