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    • 5. 发明授权
    • Light-emitting element, light emitting device, and electronic device
    • 发光元件,发光元件和电子元件
    • US09437824B2
    • 2016-09-06
    • US13748844
    • 2013-01-24
    • Semiconductor Energy Laboratory Co., Ltd.
    • Takahiro UshikuboSatoshi SeoNobuharu Ohsawa
    • H01L29/08H01L51/00H01L51/50H05B33/14
    • H01L51/0052H01L51/006H01L51/0072H01L51/5036H05B33/14
    • A light-emitting element includes a light-emitting layer having a two-layer structure in which a first light-emitting layer containing a first light-emitting substance and a second light-emitting layer containing a second light-emitting substance, which is in contact with the first light-emitting layer, are provided between an anode and a cathode. The first light-emitting layer is separated into two layers of a layer provided on the anode side and a layer provided on the cathode side. The layer provided on the anode side contains only a first light-emitting substance, or a first organic compound of less than 50 wt % and the first light-emitting substance of 50 wt % to 100 wt %. The layer provided on the cathode side contains a second organic compound and the first light-emitting substance. The second light-emitting layer, which is provided in contact with the first light-emitting layer, contains the second light-emitting substance and a third organic compound.
    • 发光元件包括具有两层结构的发光层,其中含有第一发光物质的第一发光层和含有第二发光物质的第二发光层,所述第二发光层处于 与第一发光层接触,设置在阳极和阴极之间。 第一发光层被分离成设置在阳极侧的层和设置在阴极侧的层的两层。 设置在阳极侧的层仅包含第一发光物质或小于50重量%的第一有机化合物和50重量%至100重量%的第一发光物质。 设置在阴极侧的层包含第二有机化合物和第一发光物质。 与第一发光层接触地设置的第二发光层含有第二发光物质和第三有机化合物。