Hole-transporting material and use thereof

Claim 1

In an organic EL device which comprises (1) a pair of electrodes and a light-emitting layer formed of an organic compound layer placed between the pair of electrodes, or (2) a pair of electrodes and a plurality of organic compound layers including a light-emitting layer and a hole-injection layer placed between the pair of electrodes, the improvement wherein the light-emitting layer or the hole-injection layer contains a hole-transporting material of the formula (1) H--A-- --B--A--!.sub.n --B--A--H (1) wherein A is an aromatic amine derivative residue of the following formula (2), B is a residue of the following formula (3), and n is an integer of 1 to 5,000, Formula (2): ##STR55## wherein each of R 1 to R 10 is independently hydrogen, halogen, an unsubstituted alkyl group, a substituted alkyl group, an unsubstituted alkoxy group, a substituted alkoxy group, an unsubstituted thioalkoxy group, a substituted thioalkoxy group, a cyano group, an amino group, mono- or disubstituted amino group, a hydroxyl group, a mercapto group, an unsubstituted aryloxy group, a substituted aryloxy group, an unsubstituted arylthio group, a substituted arylthio group, an unsubstituted aromatic group, a substituted aromatic group, an unsubstituted heterocyclic group or a substituted heterocyclic group, and wherein adjacent substituents among R 1 to R 10 may form a substituted or unsubstituted ring or rings, X is a divalent aromatic residue or --Ar--Z--Ar-- in which Ar is an aromatic residue having 6 to 20 carbon atoms and Z is a direct bond, oxygen, sulfur, selenium, an aromatic residue which may contain any one of oxygen, sulfur and selenium, or a divalent aliphatic residue which may contain any one of oxygen, sulfur and selenium, and m is an integer of 0 or 1, Formula (3): ##STR56## wherein each of R 11 to R 14 is independently hydrogen, halogen, an unsubstituted alkyl group, a substituted alkyl group, an unsubstituted alkoxy group, a substituted alkoxy group or a disubstituted amino group, and wherein adjacent substituents among R 11 to R 14 may form a substituted or unsubstituted ring, Y is oxygen, sulfur or monosubstituted nitrogen, j is an integer of 0 or 1 and k is an integer of 4 to 7.