Light-emitting element, light-emitting device, display device, electronic appliance, and lighting device

摘要

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.

主权项

1. A light-emitting element comprising:
a first electrode; a first light-emitting layer over the first electrode, the first light-emitting layer comprising a mixture of a first organic compound and a second organic compound in a single layer; a second light-emitting layer over the first light-emitting layer, the second light-emitting layer comprising a mixture of the first organic compound and a third organic compound in a single layer; 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 a first emission peak of the first exciplex and a second emission peak of the second exciplex are different from each other.