Patent ID: 11956981
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC H  C | IPC C  H

Claim 0:
1. A light-emitting device comprising:
a first electrode;
a light-emitting layer over the first electrode, the light-emitting layer comprising:
a first organic compound configured to convert triplet excitation energy into light emission;
a second organic compound comprising a π-electron rich skeleton and a π-electron deficient skeleton; and
a third organic compound configured to convert singlet excitation energy into light emission; and
a second electrode over the light-emitting layer,

wherein the π-electron rich skeleton comprises any one of an acridine skeleton, a phenoxazine skeleton, a phenothiazine skeleton, a furan skeleton, a thiophene skeleton, and a pyrrole skeleton,
wherein the π-electron deficient skeleton comprises any one of a pyridine skeleton, a diazine skeleton (a pyrimidine skeleton, a pyrazine skeleton, or a pyridazine skeleton), a triazine skeleton, and an aromatic ring having a cyano group,
wherein the second organic compound is a thermally activated delayed fluorescence material,
wherein light emission from the light-emitting layer comprises light emission from the third organic compound, and
wherein the lowest triplet excitation energy level of the first organic compound is higher than or equal to the lowest triplet excitation energy of the third organic compound.