LIGHT-EMITTING ELEMENT AND DISPLAY DEVICE HAVING THE LIGHT-EMITTING ELEMENT

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LIGHT-EMITTING ELEMENT AND DISPLAY DEVICE HAVING THE LIGHT-EMITTING ELEMENT

This abstract first appeared for US patent application 18910107 titled 'LIGHT-EMITTING ELEMENT AND DISPLAY DEVICE HAVING THE LIGHT-EMITTING ELEMENT

Original Abstract Submitted

Disclosed is a light-emitting element including an anode, a cathode, and an electroluminescence layer between the anode and the cathode. The electroluminescence layer includes an electron-blocking layer and an emission layer. The electron-blocking layer contains an electron-blocking material. The emission layer is located over and in contact with the electron-blocking layer and contains a host material and a first emission material exhibiting thermally activated delayed fluorescence. The light-emitting element is configured so that a resistance is equal to or greater than 101.0% and equal to or less than 104.0% of a resistance in a case where the electron-blocking material is replaced with the host material. The resistance is a resistance between the anode and the cathode when a current flows at a constant current density between the anode and the cathode.