Invention Grant
US09362517B2 Light-emitting element, display module, lighting module, light-emitting device, display device, electronic appliance, and lighting device 有权
发光元件,显示模块,照明模块,发光装置,显示装置,电子设备和照明装置

Light-emitting element, display module, lighting module, light-emitting device, display device, electronic appliance, and lighting device
Abstract:
An object of one embodiment of the present invention is to provide a multicolor light-emitting element that utilizes fluorescence and phosphorescence and is advantageous for practical application. The light-emitting element has a stacked-layer structure of a first light-emitting layer containing a host material and a fluorescent substance, a separation layer containing a substance having a hole-transport property and a substance having an electron-transport property, and a second light-emitting layer containing two kinds of organic compounds that form an exciplex and a substance that can convert triplet excitation energy into luminescence. Note that a light-emitting element in which light emitted from the first light-emitting layer has an emission spectrum peak on the shorter wavelength side than an emission spectrum peak of the second light-emitting layer is more effective.
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