LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, AND METHOD FOR MANUFACTURING THE SAME

摘要

An object is to provide a light-emitting element with high emission efficiency. Another object is to provide a light-emitting element with a long lifetime and high reliability. Another object is to provide a light-emitting element driven at low voltage. A first light-emitting layer whose one surface is in contact with a hole-transport layer, and a second light-emitting layer which is in contact with the other surface of the first light-emitting layer and includes a bipolar host material and a light-emitting substance are provided, where the hole-transport property of the first light-emitting layer is higher than that of the second light-emitting layer. A recombination region of holes and electrons is preferably provided in the light-emitting layer. The hole-transport layer preferably includes an anti-reducing substance.