Organic electroluminescence composition, material for organic electroluminescence element, solution of material for organic electroluminescence element, and organic electroluminescence element

An organic electroluminescence device, comprising a cathode, an anode, and at least one organic thin film layer disposed between the cathode and the anode,

• wherein:
• the at least one organic thin film layer includes a light emitting layer comprising two host materials in total;
• the two host materials consist of two compounds represented by formula (1), or the two host materials consist of one compound represented by formula (1) and one compound represented by formula (3) which is different from the compound represented by formula (1):
• A represents a substituted or unsubstituted aromatic heterocyclic group having at least one nitrogen atom;
• L1 represents a single bond, a substituted or unsubstituted aromatic hydrocarbon ring group, or a substituted or unsubstituted aromatic heterocyclic group;
• m represents an integer of 2 or more;
• groups L1 may be the same or different, and residues B may be the same or different;
• each X5 and each Y5 represent a single bond, —CR2—, —NR—, —O—, —S—, or —SiR2—, provided that X5 and Y5 cannot all be a single bond;
• R represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aromatic hydrocarbon ring group, or a substituted or unsubstituted aromatic heterocyclic group;
• Z7 and Z8 each independently represent a substituted or unsubstituted hydrocarbon group, a substituted or unsubstituted aliphatic heterocyclic group, a substituted or unsubstituted aromatic hydrocarbon ring group, or a substituted or unsubstituted aromatic heterocyclic group, provided that each of Z7 and Z8 does not represent an alicyclic hydrocarbon group having three or more fused rings, an aliphatic heterocyclic group having three or more fused rings, an aromatic hydrocarbon ring group having three or more fused rings, or an aromatic heterocyclic group having three or more fused rings;
• t represents an integer of 1 or more;
• L3 represents a single bond, a substituted or unsubstituted aromatic hydrocarbon ring group, a substituted or unsubstituted aromatic heterocyclic group, or a combination thereof, provided that when t is 1, L3 is not a single bond;
• B of formula (1) is a group represented by formula (2-A) or (2-B):
• in formula (2-A),
• Xb12 represents —NR—, —O—, —S—, or —SiR2—,
• Rb11, Rb12, and Rb13, and Rb14 each independently represent a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon, atoms, a substituted or unsubstituted aralkyl group having 7 to 24 carbon atoms, a substituted or unsubstituted silyl group, a substituted or unsubstituted aromatic hydrocarbon ring group having 6 to 24 ring carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 2 to 24 ring carbon atoms,
• s1 is an integer of 0 to 4, and when s1 is 2 or more, groups Rb11 may be the same or different,
• t1 is an integer of 0 to 3, and when t1 is 2 or more, groups Rb12 may be the same or different,
• u1 is an integer of 0 to 3, and when u1 is 2 or more, groups Rb13 may tae the same or different, and
• v1 is an integer of 0 to 4, and when v1 is 2 or more, groups Rb14 may be the same or different, and
• * is a bonding site to L1 of formula (1);
• in formula (2-B),
• s1 represents an integer of 0 to 3;
• the aromatic heterocyclic group of A in formula (1) is at least one selected from the group consisting of pyridine, pyrazine, pyrimidine, pyridazine, triazine, quinoline, isoquinoline, quinoxaline, quinazoline, aziridine, azaindolizine, indolizine, imidazole, indole, isoindole, indazole, purine, pteridine, β-carboline, naphthyridine, benzo[f]quinazoline, benzo[h]quinazoline, azafluoranthene, diazafluoranthene, pyrazole, tetrazole, quinolizine, cinnoline, phthalazine, biscarbazole, phenazine, azatriphenylene, diazatriphenylene, hexaazatriphenylene, azacarbazole, azadibenzofuran, azadibenzothiophene, and dinaphtho[2′3′:2,3:2′,3′:6,]carbazole;
• and
• an optional substituent of the substituted or unsubstituted aromatic heterocyclic group of A in formula (1) is at least one selected from the group consisting of a halogen atom, a cyano group, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a haloalkyl group having 1 to 20 carbon atoms, a haloalkoxy group having 1 to 20 carbon atoms, an alkylsilyl group having 1 to 10 carbon atoms, an aryl group having 6 to 30 ring carbon atoms, an aryloxy group having 6 to 30 ring carbon atoms, an arylsilyl group having 6 to 30 ring carbon atoms, an aralkyl group having 7 to 30 carbon atoms, a heteroaryl group having 2 to 30 ring carbon atoms, an aralkyl group having 7 to 51 carbon atoms which includes an aryl group having 6 to 50 ring carbon atoms, an amino group, a mono- or di-substituted amino group, wherein the substituent is selected from an alkyl group having 1 to 50 carbon atoms and an aryl group having 6 to 50 ring carbon atoms, an alkoxy group having an alkyl group having 1 to 50 carbon atoms, an aryloxy group having an aryl group having 6 to 50 ring carbon atoms, a mono-, di- or tri-substituted silyl group, wherein the substituent is selected from an alkyl group having 1 to 50 carbon atoms and an aryl group having 6 to 50 ring carbon atoms, a nitro group, a substituted sulfonyl group, wherein the substituent is selected from an alkyl group having 1 to 50 carbon atoms and an aryl group having 6 to 50 ring carbon atoms, a di-substituted phosphoryl group, wherein the substituent is selected from an alkyl group having 1 to 50 carbon atoms and an aryl group having 6 to 50 ring carbon atoms, an alkylsulfonyloxy group, an arylsulfonyloxy group, an alkylcarbonyloxy group, an arylcarbonyloxy group, a boron-containing group, a zinc-containing group, a tin-containing group, a silicon-containing group, a magnesium-containing group, a lithium-containing group, a hydroxyl group, an alkyl-substituted or aryl-substituted carbonyl group, a carboxyl group, a vinyl group, a (meth)acryloyl group, an epoxy group, and oxetanyl group.