Patent ID: 11937439
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 0:
1. A light-emitting element comprising:
an anode;
a hole-transport layer over the anode;
a first light-emitting layer over the hole-transport layer, the first light-emitting layer comprising a first organic compound and a second organic compound;
a second light-emitting layer over and in contact with the first light-emitting layer, the second light-emitting layer comprising a third organic compound and a phosphorescent compound;
an electron-transport layer over the second light-emitting layer; and
a cathode over the electron-transport layer,
wherein each of a triplet excited level of the first organic compound and the second organic compound is higher than a triplet excited level of the phosphorescent compound,
wherein a combination of the first organic compound and the second organic compound forms a first exciplex,
wherein light emitted from the first light-emitting layer has an emission peak at 500 nm to 600 nm, and
wherein light emitted from the second light-emitting layer has an emission peak at 600 nm to 700 nm.