Light-emitting element, display device, electronic device, and lighting device

Abstract

To provide a light-emitting element including an exciplex that efficiently emits light. The light-emitting element includes a first organic compound and a second organic compound. A combination of the first organic compound and the second organic compound forms an exciplex. The energy difference between the LUMO level of the first organic compound and the HOMO level of the second organic compound is greater than the emission energy of the exciplex by −0.1 eV or more and 0.4 eV or less. The lower of the lowest triplet excitation energy level of the first organic compound and the lowest triplet excitation energy level of the second organic compound has energy that is larger than the emission energy of the exciplex by −0.2 eV or more and 0.4 eV or less.

Dependencies are inferred from the claim text.