LIGHT-EMITTING ELEMENT, DISPLAY MODULE, LIGHTING MODULE, LIGHT-EMITTING DEVICE, DISPLAY DEVICE, ELECTRONIC APPLIANCE, AND LIGHTING DEVICE

摘要

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.

主权项

1. A light-emitting element comprising:
a pair of electrodes; and an EL layer between the pair of electrodes, wherein the EL layer comprises a first light-emitting layer, a second light-emitting layer, and a first layer between the first light-emitting layer and the second light-emitting layer, wherein an emission spectrum of the first light-emitting layer is in a shorter wavelength region than an emission spectrum of the second light-emitting layer, wherein the first light-emitting layer comprises a fluorescent substance and a host material, wherein the second light-emitting layer comprises a substance capable of converting triplet excitation energy into light emission, a first organic compound, and a second organic compound, and wherein the first organic compound and the second organic compound form a first exciplex.