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 18910109 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; a buffer layer over the electron-blocking layer; and an emission layer located over the buffer layer and containing a host material and a first emission material exhibiting thermally activated delayed fluorescence. The buffer layer contains the host material. The emission layer may further include a second emission material. An energy level of a singlet excited state of the second emission material is lower than an energy level of a singlet excited state of the first emission material.