An Electroluminescent Device Comprising an Anode Layer, a Cathode Layer, a First Emission Layer, a Hole Injection Layer and a First Hole Transport Layer that Comprises a Compound Containing a Metal

An organic electroluminescent device comprising an anode layer, a cathode layer, a first emission layer (EML), a hole injection layer (HIL) and a first hole transport layer (HTL), wherein

• the hole injection layer comprises a compound of formula (I):
• wherein
• M is a metal ion,
• n is an integer selected from 1 to 4, which corresponds to the oxidation number of M;
• AL is an ancillary ligand;
• m is an integer selected from 0, 1 or 2;
• L is a ligand of formula (II):
• X is N or C-A3;
• Y1 and Y2 are independently selected from CO or SO2;
• A1 and A2 are independently selected from substituted or unsubstituted C1 to C12 alkyl, substituted or unsubstituted C6 to C19 aryl, substituted or unsubstituted C3 to C12 heteroaryl,
• wherein the substituents on A1 and A2 are independently selected from D, C6 aryl, C3 to C9 heteroaryl, C1 to C6 alkyl, C1 to C6 alkoxy, C3 to C6 branched alkyl, C3 to C6 cyclic alkyl, C3 to C6 branched alkoxy, C3 to C6 cyclic alkoxy, partially or perfluorinated C1 to C16 alkyl, partially or perfluorinated C1 to C16 alkoxy, partially or perdeuterated C1 to C6 alkyl, partially or perdeuterated C1 to C6 alkoxy, COR1, COOR1, halogen, F or CN;
• A3 is selected from H, D, C1 to C4 alkyl, partially or perfluorinated C1 to C4 alkyl, CN, F, or A1 and A3 are bridged to form a cyclic ring;
• wherein
• at least two of the substituents in L of formula (II) are independently selected from C3 to C9 heteroaryl, C1 to C6 alkoxy, C3 to C6 branched alkoxy, C3 to C6 cyclic alkoxy, partially or perfluorinated C1 to C16 alkyl, partially or perfluorinated C1 to C16 alkoxy, partially or perdeuterated C1 to C6 alkoxy, COR1, COOR1, halogen, F or CN;
• wherein
• R1 is selected from C6 aryl, C3 to C9 heteroaryl, C1 to C6 alkyl, C1 to C6 alkoxy, C3 to C6 branched alkyl, C3 to C6 cyclic alkyl, C3 to C6 branched alkoxy, C3 to C6 cyclic alkoxy, partially or perfluorinated C1 to C16 alkyl, partially or perfluorinated C1 to C16 alkoxy, partially or perdeuterated C1 to C6 alkyl, partially or perdeuterated C1 to C6 alkoxy;
• the first emission layer comprises a compound of formula (III) and an organic emitter host compound:
• wherein
• Z1, Z2 and Z3 are the same as or selected different from each other, and are each independently selected from the group comprising a monocyclic to polycyclic aromatic hydrocarbon ring or monocyclic to polycyclic aromatic hetero ring;
• Ar31 and Ar32 are the same as or selected different from each other, and are each independently and are each independently selected from the group comprising a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, or are bonded to an adjacent substituent to form a substituted or unsubstituted aromatic ring or a substituted or unsubstituted aliphatic ring;
• R31, R32 and R33 are the same as or selected different from each other, and are each independently selected from the group comprising hydrogen, deuterium, a substituted or unsubstituted alkyl group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, or adjacent substituents are bonded to each other to form a substituted or unsubstituted aromatic ring or a substituted or unsubstituted aliphatic ring,
• wherein one or more substituents selected from the group consisting of deuterium, an alkyl group having 1 to 6 carbon atoms, an alkyl silyl group having 1 to 30 carbon atoms, an aryl silyl group having 6 to 50 carbon atoms, an alkylamine group having 1 to 30 carbon atoms, an alkylarylamine group having 1 to 50 carbon atoms, an arylamine group having 6 to 50 carbon atoms, an aryl group having 6 to 30 carbon atoms, and a heteroaryl group having 2 to 30 carbon atoms, or a substituent to which two or more substituents selected from the group are linked, or adjacent substituents are bonded to each other to form an aliphatic hydrocarbon ring having 3 to 60 carbon atoms, which is unsubstituted or substituted with the substituent;
• r31, r32 and r33 are each an integer from 0, 1, 2, 3 or 4, and when r31 to r33 are 2 or higher, substituents in the parenthesis are the same as or selected different from each other;
• wherein the organic emitter host compound comprises:
• at least one condensed aromatic ring system consisting of at least ≥3 to ≤5 condensed aromatic rings, and
• selected from the group of at least ≥3 to ≤7 aromatic rings, or at least ≥3 to ≤7 heteroaromatic rings,
• wherein selected from the group of at least ≥2 to ≤7 of the aromatic rings, at least ≥3 to ≤7 of the heteroaromatic rings are condensed to form a fused aromatic ring system, or at least ≥3 to ≤7 of the heteroaromatic rings are condensed to form a fused heteroaromatic ring systems, and
• wherein the molecular weight Mw of the organic emitter host compound is in the range of ≥400 g/mol and ≤2000 g/mol;
• the first hole transport layer comprises an organic hole transport compound, wherein the organic hole transport compound comprises:
• at least ≥1 to ≤3 amine moieties, and
• at least ≥8 to ≤12 aromatic rings or heteroaromatic rings, and
• wherein the molecular weight Mw of the organic hole transport compound is in the range of ≥400 g/mol and ≤2000 g/mol;
• wherein
• the hole injection layer is arranged between the anode layer and the first hole transport layer;
• the first emission layer is arranged between the first hole transport layer and the cathode layer;
• and the first hole transport layer is arranged between the hole injection layer and the first emission layer.