Light-emitting element, light-emitting device, and electronic device

摘要

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.