Organic electroluminescent device

An organic electroluminescent device comprising a first electrode, a second electrode facing the first electrode, a light-emitting layer between the first electrode and the second electrode, and an electron transport zone between the light-emitting layer and the second electrode, wherein the light-emitting layer comprises a compound represented by the following formula 1:

• wherein,
• L1 represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (5- to 30-membered)heteroarylene,
• X1 to X6, each independently, represent N or CR3, with a proviso that at least one of X1 to X6 represent N,
• Ar1 represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (5- to 30-membered)heteroaryl,
• R1 to R3, each independently, represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (5- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C6-C30)aryl(C1-C30)alkyl, —NR11R12, —SiR13R14R15, —SR16, —OR17, a cyano, a nitro, or a hydroxy, with a proviso that in at least one group of the adjacent two R1 groups and the adjacent two R2 groups, the adjacent two R1 or the adjacent two R2, each independently, are linked to form at least one substituted or unsubstituted benzene ring,
• R11 to R17, each independently, represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6C30)aryl, a substituted or unsubstituted (5- to 30-membered)heteroaryl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, or a substituted or unsubstituted (C3-C30)cycloalkyl;
• or may be linked to an adjacent substituent to form a substituted or unsubstituted, mono- or polycyclic, (C3-C30) alicyclic or aromatic ring, or a combination of alicyclic and aromatic rings, whose carbon atom(s) may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur, and
• a and b, each independently, represent an integer of 1 to 4, where if a and b, each independently, are an integer of 2 or more, each of R1 and R2 may be the same or different;
• and
• the electron transport zone comprises a compound represented by the following formula 11:
• wherein,
• the electron transport zone comprises a compound represented by the following formula 11:
• wherein,
• N1 and N2, each independently, represent N or CR18, with a proviso that at least one of N1 and N2 represent N,
• Y1 to Y4, each independently, represent N or CR19,
• R18 and R19, each independently, represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C50)aryl, a substituted or unsubstituted (3- to 50-membered)heteroaryl, a substituted or unsubstituted (C1-C30)cycloalkyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted mono- or di- (C1-C30)alkylamino, a substituted or unsubstituted mono- or di- (C6-C30)arylamino, or a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino;
• or may be linked to an adjacent substituent to form a substituted or unsubstituted, mono- or polycyclic, (C3-C30) alicyclic or aromatic ring, or a combination of alicyclic and aromatic rings, whose carbon atom(s) may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur,
• the heteroaryl(ene) contains at least one heteroatom selected from B, N, O, S, Si, and P;
• and
• the heterocycloalkyl contains at least one heteroatom selected from O, S, and N.