Light-emitting element, light-emitting device, lighting device, and electronic device
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United States of America Patent
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Apr 30, 2013
Grant Date -
Sep 20, 2012
app pub date -
May 31, 2012
filing date -
Dec 1, 2008
priority date (Note) -
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Abstract
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.
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