Organic electroluminescent device

An organic electroluminescent device comprising, in this order:

• an anode electrode;
• a hole-injecting layer;
• a hole-transporting layer;
• an emitting layer;
• an electron-transporting layer;
• and
• a cathode electrode,
• wherein the electron-transporting layer comprises a third compound having a pyridine ring and a pyridoindole ring in its structure and represented by formula (1):
• wherein:
• Ar1 represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group;
• R1 to R11 may be the same or different and each represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a linear or branched alkyl group having from 1 to 6 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group;
• B1 represents a substituted or unsubstituted aromatic hydrocarbon divalent group, a substituted or unsubstituted aromatic heterocyclic divalent group, a substituted or unsubstituted condensed polycyclic aromatic divalent group, or a single bond;
• m1 and n1 each represent an integer of from 1 to 3;
• and
• W, X, Y, and Z each represent a carbon atom or a nitrogen atom, provided that when m1 is 2, and when m1 is 3, then n1 is 1, and only one of W, X, Y, and Z represents a nitrogen atom, and the nitrogen atom is not substituted with any of R8 to R11;
• wherein the hole-injecting layer comprises a first arylamine compound represented by formula (2):
• wherein:
• R12 to R23 are the same or different and each represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a linear or branched alkyl group having from 1 to 6 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic, group or a substituted or unsubstituted condensed polycyclic aromatic group, and when a plurality of these substituents are bonded on the same benzene ring, they may be bonded to each other to form a ring;
• r12 to r23 each represent an integer of from 1 to 4;
• and
• A1, A2, and A3 are the same or different and each represents a divalent group represented by one of structural formulae (B) to (F):
• wherein n2 represents an integer of from 1 to 3;
• or
• a single bond, and
• wherein the hole-transporting layer comprises a second arylamine compound represented by formula (3):
• wherein:
• R24 to R29 are the same or different and each represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a linear or branched alkyl group having from 1 to 6 carbon atoms, a linear or branched alkenyl group having from 1 to 6 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group, and when a plurality of these substituents are bonded on the same benzene ring, they may be bonded to each other to form a ring;
• r24 to r29 each represent an integer of from 1 to 4;
• and
• A4 represents a divalent group represented by one of structural formulae (B) to (F):
• wherein n2 represents an integer of from 1 to 3;
• or
• a single bond.