Invention Grant
US09276221B2 Light-emitting element, light-emitting device, electronic device, and lighting device comprising a phthalocyanine-based material 有权
发光元件,发光装置,电子装置以及包含酞菁类材料的照明装置

Light-emitting element, light-emitting device, electronic device, and lighting device comprising a phthalocyanine-based material
Abstract:
A light-emitting element that emits light with high luminance and can be driven at low voltage. The light-emitting element includes n (n is a natural number greater than or equal to 2) EL layers between an anode and a cathode, and includes a first layer, a second layer, and a third layer between an m-th (m is a natural number, 1≦m≦n−1) EL layer from the anode and an (m+1)th EL layer. The first layer functions as a charge-generation region, has hole-transport properties, and contains an acceptor substance. The third layer has electron-transport properties and contains an alkali metal or the like. The second layer is formed of a phthalocyanine-based material and is provided between the first layer and the third layer, whereby an injection barrier at the time of injecting electrons generated in the first layer into the m-th EL layer through the third layer can be lowered.
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