Organic Electroluminescence Device

A composition, comprising:

• at least each one of a compound represented by the following Formula (3) and a compound represented by the following Formula (D-5):
• Z3Y3)n 3 (3)
• wherein Z3 represents benzene, pyridine, triazine, pyrimidine, biphenyl, phenylpyridine, bipyridine, a silicon atom or a carbon atom, and may be further substituted by at least one group selected from the group consisting of an alkyl group, an aryl group, a silyl group, a cyano group, a fluorine atom and a combination thereof;
• Y3 represents a group represented by the following Formula (3a-1) or (3a-2);
• and
• n3 represents an integer of 1 to 4:
• in Formulas (3a-1) and (3a-2), the ring A represents an aromatic ring or a heterocyclic ring, represented by Formula (3b), which is condensed with an adjacent ring;
• the ring B represents a heterocyclic ring represented by Formula (3c), which is condensed with an adjacent ring;
• X3 represents C—R″ in which R″ represents a hydrogen atom or a substituent, or a nitrogen atom;
• each of R34 and R311 independently represents a benzene ring, a naphthalene ring, a pyridine ring, a triazine ring or a pyrimidine ring, and these rings may be further substituted by at least one group selected from the group consisting of a methyl group, an isobutyl group, a t-butyl group, a neopentyl group, a phenyl group, a naphthyl group, a cyano group and a fluorine atom;
• R33 represents a hydrogen atom;
• each of R31 and R32 independently represents a hydrogen atom, an alkyl group, a silyl group, a fluorine atom, a cyano group or a trifluoromethyl group, and these groups may be further substituted by at least one of an alkyl group having 1 to 6 carbon atoms and a phenyl group;
• and
• * represents a bond for linking to Z3
• in Formula (D-1), M represents iridium;
• each of R3 to R6 independently represents a hydrogen atom, an alkyl group or an aryl group;
• R3′ represents a hydrogen atom, an alkyl group or an aryl group;
• the ring Q represents a pyridine ring, a quinoline ring or an isoquinoline ring, which is coordinated to iridium, and may be further substituted by an alkyl group or an aryl group;
• R5 represents an aryl group or a heteroaryl group when the ring Q is a pyridine ring, and the aryl group or the heteroaryl group may be further substituted by an alkyl group;
• R3′ and R6 may be linked to each other by a linking group selected from the group consisting of —CR2—CR2—, —CR═CR—, —CR2—, —O—, —NR—, —O—CR2—, —NR—CR2— and —N═CR— to form a ring;
• each R independently represents a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heteroaryl group, and may further have a substituent selected from the group consisting of a halogen atom, —R′, —OR′, —N(R′)2, —SR′, —C(O)R′, —C(O)OR′, —C(O)N(R′)2, —CN, —NO2, —SO2, —SOR′, —SO2R′ and —SO3R′;
• each R′ independently represents a hydrogen atom, an alkyl group, a perhaloalkyl group, an alkenyl group, an alkynyl group, an aryl group or a heteroaryl group;
• (X—Y) represents a ligand represented by any one of the following Formula (1-1), (1-4) and (1-15);
• m represents an integer of 1 to 3;
• and
• n represents an integer of 0 to 2, provided that m+n is 3:
• in Formulas (1-1), (1-4) and (1-15), each of Rx, Ry and Rz independently represents a hydrogen atom, an alkyl group, a perfluoroalkyl group, a halogen atom or an aryl group.

A light emitting layer, comprising:

• at least each one of a compound represented by the following Formula (3) and a compound represented by the following Formula (D-5):
• Z3Y3)n 3 (3)
• wherein Z3 represents benzene, pyridine, triazine, pyrimidine, biphenyl, phenylpyridine, bipyridine, a silicon atom or a carbon atom, and may be further substituted by at least one group selected from the group consisting of an alkyl group, an aryl group, a silyl group, a cyano group, a fluorine atom and a combination thereof;
• Y3 represents a group represented by the following Formula (3a-1) or (3a-2);
• and
• n3 represents an integer of 1 to 4:
• in Formulas (3a-1) and (3a-2), the ring A represents an aromatic ring or a heterocyclic ring, represented by Formula (3b), which is condensed with an adjacent ring;
• the ring B represents a heterocyclic ring represented by Formula (3c), which is condensed with an adjacent ring;
• X3 represents C—R″ in which R″ represents a hydrogen atom or a substituent, or a nitrogen atom;
• each of R34 and R311 independently represents a benzene ring, a naphthalene ring, a pyridine ring, a triazine ring or a pyrimidine ring, and these rings may be further substituted by at least one group selected from the group consisting of a methyl group, an isobutyl group, a t-butyl group, a neopentyl group, a phenyl group, a naphthyl group, a cyano group and a fluorine atom;
• R33 represents a hydrogen atom;
• each of R31 and R32 independently represents a hydrogen atom, an alkyl group, a silyl group, a fluorine atom, a cyano group or a trifluoromethyl group, and these groups may be further substituted by at least one of an alkyl group having 1 to 6 carbon atoms and a phenyl group;
• and
• * represents a bond for linking to Z3
• in Formula (D-1), M represents iridium;
• each of R3 to R6 independently represents a hydrogen atom, an alkyl group or an aryl group;
• R3′ represents a hydrogen atom, an alkyl group or an aryl group;
• the ring Q represents a pyridine ring, a quinoline ring or an isoquinoline ring, which is coordinated to iridium, and may be further substituted by an alkyl group or an aryl group;
• R5 represents an aryl group or a heteroaryl group when the ring Q is a pyridine ring, and the aryl group or the heteroaryl group may be further substituted by an alkyl group;
• R3′ and R6 may be linked to each other by a linking group selected from the group consisting of —CR2—CR2—, —CR═CR—, —CR2—, —O—, —NR—, —O—CR2—, —NR—CR2— and —N═CR— to form a ring;
• each R independently represents a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heteroaryl group, and may further have a substituent selected from the group consisting of a halogen atom, —R′, —OR′, —N(R′)2, —SR′, —C(O)R′, —C(O)OR′, —C(O)N(R′)2, —CN, —NO2, —SO2, —SOR′, —SO2R′ and —SO3R′;
• each R′ independently represents a hydrogen atom, an alkyl group, a perhaloalkyl group, an alkenyl group, an alkynyl group, an aryl group or a heteroaryl group;
• (X—Y) represents a ligand represented by any one of the following Formula (1-1), (1-4) and (1-15);
• m represents an integer of 1 to 3;
• and
• n represents an integer of 0 to 2, provided that m+n is 3:
• in Formulas (1-1), (1-4) and (1-15), each of Rx, Ry and Rz independently represents a hydrogen atom, an alkyl group, a perfluoroalkyl group, a halogen atom or an aryl group.