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

Claim 0:
1. An organic electroluminescence device, comprising:
an anode;
an emitting layer; and
a cathode, wherein
the emitting layer comprises a first compound, a second compound, and a third compound,
wherein the emitting layer does not comprise a metal complex,
the first compound is a compound represented by a formula (1) below,
the second compound has a larger singlet energy than a singlet energy of the first compound,
the first compound has a larger singlet energy than a singlet energy of the third compound,
the first compound is a delayed fluorescent compound, and
the third compound is a fluorescent 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 Xb and Xe are not single bonds at the same time and Xd and Xe are not single bonds at the same time;
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;
L1 is a single bond or a linking group;
when L1 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 are each independently a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 30 ring carbon atoms,
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.