| 简介 |
PROBLEM TO BE SOLVED : To provide a light-emitting element which exhibits light emission with high luminance and can be driven at low voltage, and to provide a light-emitting device or an electronic device with reduced power consumption.
SOLUTION : There is provided a light-emitting element having n (n is a natural number equal to or greater than two) EL layers between an anode and a cathode. Between m-th (m is a natural number, 1≤m≤n-1) EL layer and (m+1)-th EL layer, the light-emitting element includes 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, in this order from an anode side. There are also provided a light-emitting device and an electronic device including the light-emitting element.
SELECTED DRAWING : Figure 1
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