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

摘要

An object is to provide a light-emitting element which exhibits light emission with high luminance and can be driven at low voltage. Another object is to provide a light-emitting device or an electronic device with reduced power consumption. Between an anode and a cathode, n (n is a natural number of two or more) EL layers are provided, where between a first EL layer and a second EL layer, a first layer containing any of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, and a rare earth metal compound, a second layer containing a material having a high electron-transporting property in contact with the first layer, and a region containing a material having a high hole-transporting property and an acceptor material in contact with the second layer are provided in this order from the anode side.

主权项

1. A light emitting element comprising:
an anode; a first EL layer over the anode; a first layer over the first EL layer; a second layer over and in contact with the first layer; a region over and in contact with the second layer; a second EL layer over the region; and a cathode over the second EL layer, wherein the first layer includes one of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, and a rare earth metal compound, wherein the second layer includes a nitrogen-containing condensed aromatic compound having an electron-withdrawing group, and wherein the region includes an aromatic amine compound or a carbazole derivative.