| 主权项 |
1. An organic electroluminescence device, comprising:
an anode; an emitting layer; and a cathode, wherein the emitting layer comprises a first compound and a second compound, the first compound is a delayed-fluorescent compound represented by a formula (1) below, and the second compound has at least one of a partial structure represented by a formula (21) below and a partial structure represented by a formula (22) below in one molecule, where: Ar11 and Ar12 are each independently a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms; L1 is a single bond or a linking group, the linking group in L1 being a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;) Y1 to Y12 are each independently a nitrogen atom or CR1; X1 is an oxygen atom, a sulfur atom, N—R10, CR11R12, SiR13R14 or GeR15R16; R1 and R10 to R16 are each independently a hydrogen atom or a substituent; when R1 and R10 to R16 are substituents, the substituents are each selected from the group consisting of a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted fluoroalkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted silyl group, a substituted germanium group, a substituted phosphine oxide group, a fluorine atom, a cyano group, a nitro group, and a carboxy group; a plurality of R1 are optionally mutually the same or different; and when at least two of the plurality of R1 are substituents, the substituents R1 are optionally mutually bonded to form a cyclic structure, in the formula (21): Y21 to Y26 are each independently a nitrogen atom or a carbon atom bonded to another atom in the molecule of the second compound; and at least one of Y21 to Y26 is a carbon atom bonded to another atom in the molecule of the second compound, and in the formula (22): Y31 to Y38 are each independently a nitrogen atom or a carbon atom bonded to another atom in the molecule of the second compound; at least one of Y31 to Y38 is a carbon atom bonded to another atom in the molecule of the second compound; and X2 is a nitrogen atom, an oxygen atom or a sulfur atom. |
