Organic electroluminescence device

A composition comprising a metal complex represented by formula (2) having a group represented by formula (I), a metal complex represented by formula (14) having the group represented by formula (I), or a metal complex represented by formula (A9) having the group represented by formula (I):

• wherein R1 represents an alkyl group;
• R2 and R3 each independently represent a hydrogen atom or an alkyl group;
• ns represents an integer of 1;
• and
• Z represents a saturated 5- to 8-membered ring;
• wherein M21 represents Ir;
• A21 to A23 each independently represent a nitrogen atom or a carbon atom;
• Z21 represents a quinoline ring, an isoquinoline ring, a benzoxazole ring, a pyridine ring, an imidazole ring, or a pyrazole ring, and these rings may have a substituent selected from the group consisting of an alkyl group, a fluorine atom, and a cyano group;
• Z22 represents a benzene ring, a pyrazole ring, a pyridine ring, a benzoxazole ring, or a thiophene ring, and these rings may have a substituent selected from the group consisting of an alkyl group, a fluorine atom, a methoxy group, an aryl group, and a cyano group;
• L22 and L23 each represent a carbon atom, a nitrogen atom, or an oxygen atom and form together with E21 a bidentate ligand of a phenylpyridine, a pyridylpyridine, a picolinic acid, or an acetylacetone;
• k represents an integer of 1 to 3;
• l represents an integer of 0 to 2;
• k+l is 3;
• S21 and S22 each independently represent the group represented by formula (I);
• n and m each represent an integer of 0 to 4;
• n+m is an integer of 1 to 4;
• and
• S21s or S22s may be the same as or different from every other S21 or S22, respectively:
• wherein A141 to A146 each independently represent a nitrogen atom or a carbon atom;
• Z141 and Z142 each independently represent an isoquinoline ring, a benzoxazole ring, a pyridine ring, an imidazole ring, or a pyrazole ring;
• Z143 and Z144 each independently represent an isoquinoline ring, a benzoxazole ring, a benzene ring, a pyridine ring, an imidazole ring, or a pyrazole ring, and these rings may have a substituent selected from the group consisting of an alkyl group, a fluorine atom, a methoxy group, an aryl group, and a cyano group;
• E141 represents a divalent linking group represented by —C(R1)(R2)—, wherein R1 and R2 represent an alkyl group;
• S141 to S144 each independently represent the group represented by formula (I);
• n, m, k and l represents an integer of 0 to 2;
• n+m+k+l is an integer of 1 to 2;
• and
• S141s, S142s, S143s or S144s may be the same as or different from every other S141, S142,S143 or S144, respectively:
• wherein R1a to R1i, each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or a cyano group and at least one of R1a to R1irepresents the group represented by formula (I);
• X—Y represents a monoanionic bidentate ligand selected from at least one of a diketone and a picolinic acid derivative;
• and
• n represents an integer of 1 to 3.

A composition comprising a metal complex represented by formula (2) and having a group represented by formula (I):

• wherein M21 represents Ir;
• A21 to A23 each independently represent a nitrogen atom or a carbon atom;
• Z21 represents a quinoline ring, an isoquinoline ring, a benzoxazole ring, a pyridine ring, an imidazole ring, or a pyrazole ring, and these rings may have a substituent selected from the group consisting of an alkyl group, a fluorine atom, or a cyano group;
• Z22 represents a benzene ring, a pyrazole ring, a pyridine ring, a benzoxazole ring, or a thiophene ring, and these rings may have a substituent selected from the group consisting of an alkyl group, a fluorine atom, a methoxy group, an aryl group, or a cyano group;
• L22 and L23 each represent a carbon atom, a nitrogen atom, or an oxygen atom and form together with E21 a bidentate ligand of a phenylpyridine, a pyridylpyridine, a picolinic acid, or an acetylacetone;
• k represents an integer of 1 to 3;
• l represents an integer of 0 to 2;
• k+l is 3;
• S21 and S22 each independently represent the group represented by formula (I);
• n and m each represent an integer of 0 to 4;
• n+m is an integer of 1 to 4;
• and wherein
• S21s or S22s may be the same as or different from every other S21 or S22, respectively:
• wherein R1 represents an alkyl group;
• R2 and R3 each independently represent a hydrogen atom or an alkyl group;
• ns represents an integer of 1;
• and
• Z represents a saturated 5- to 8-membered ring.