Light-Emitting Element, Light-Emitting Device, Display Device, Electronic Appliance, and Lighting Device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsTomoe Matsubara, Satoshi SEO
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Abstract
A multicolor light-emitting element in which light-emitting layers emitting light of different colors are stacked and color adjustment is easily made is provided. A multicolor light-emitting element which is inexpensive and has favorable emission efficiency is provided. A light-emitting element in which at least two light-emitting layers emitting light of different colors are formed in contact with each other and the light emitted from the two light-emitting layers is obtained from exciplexes is provided. In addition, the light-emitting element in which the exciplexes emit delayed fluorescence is provided.
Claims21
(canceled)
A light-emitting element comprising:
- a first electrode;
- a first light-emitting layer over the first electrode, the first light-emitting layer comprising a first organic compound and a second organic compound;
- a second light-emitting layer over the first light-emitting layer, the second light-emitting layer comprising the first organic compound and a third organic compound;
- and
- a second electrode over the second light-emitting layer;
- wherein the second organic compound is capable of forming a first exciplex with the first organic compound,
- wherein the third organic compound is capable of forming a second exciplex with the first organic compound, and
- wherein the first exciplex and the second exciplex emit light having peaks at different wavelengths from each other.
A light-emitting element comprising:
- a first electrode;
- a first light-emitting layer over the first electrode, the first light-emitting layer comprising a first organic compound and a second organic compound;
- a second light-emitting layer over the first light-emitting layer, the second light-emitting layer comprising the first organic compound and a third organic compound;
- and
- a second electrode over the second light-emitting layer;
- wherein the first light-emitting layer is in contact with the second light-emitting layer,
- wherein the second organic compound is capable of forming a first exciplex with the first organic compound,
- wherein the third organic compound is capable of forming a second exciplex with the first organic compound, and
- wherein the first exciplex and the second exciplex emit light having peaks at different wavelengths from each other.
Dependencies are inferred from the claim text.