Patent ID: 11968894
Assignee: IDEMITSU KOSAN CO., LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC H  C | IPC C  H

Claim 21:
22. An organic-electroluminescence-device material comprising:
a first compound represented by a formula (1) below;
a second compound having a larger singlet energy than a singlet energy of the first compound; and
a third fluorescent compound, wherein
the first compound is a delayed fluorescent compound, and
the first compound has a larger singlet energy than a singlet energy of the third compound,, , where: Xa is an oxygen atom, a sulfur atom, or CR3R4;
Xb, and Xc, are each independently a single bond, an oxygen atom, a sulfur atom, NR1 or CR3R4;
Xd and Xe are each independently a single bond, an oxygen atom, a sulfur atom, or CR3R4;
at least one of Xb and Xc, is NR1;
R1 is a hydrogen atom or a substituent;
when R1 is a substituent, the substituent is selected from the group consisting of a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms, 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, and a group represented by -L1-R2;
L+1 is a single bond or a linking group;
when L+1 is a linking group, the linking group is selected from the group consisting of a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms and a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
R2 to R4 are each independently a hydrogen atom or a substituent;
when R2 to R4 are substituents, the substituents are each independently selected from the group consisting of a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms and a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms; and
Z1, Z2, Z3 and Z4 each independently represent a cyclic structure selected from the group consisting of a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 30 ring carbon atoms,
wherein
the second compound has at least one of a partial structure represented by formula (21) and a partial structure represented by formula (22) in one molecule:, where:
in 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,
in 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.