LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, AND LIGHTING DEVICE

摘要

A novel light-emitting element or a highly reliable light-emitting element is provided. The light-emitting element includes an anode, a cathode, and an EL layer between the anode and the cathode. The EL layer includes at least a light-emitting layer. The light-emitting layer includes at least a first organic compound and a second organic compound. The energy for liberating halogen from a halogen-substituted product of the first organic compound in a radical anion state and in a triplet excited state is less than or equal to 1.00 eV. The amount of halogen-substituted product in the second organic compound is not increased with an increase in driving time of the light-emitting element.

主权项

1. A light-emitting element comprising:
an anode; a cathode; and an EL layer including a light-emitting layer between the anode and the cathode, wherein the light-emitting layer comprises a first organic compound and a second organic compound, and wherein neither an amount of a halogen-substituted product of the first organic compound nor an amount of a halogen-substituted product of the second organic compound is increased with an increase in driving time of the light-emitting element.