LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, DISPLAY DEVICE, AND ELECTRONIC APPARATUS

摘要

A light-emitting element includes an anode, a cathode, a luminescent layer between the anode and the cathode that emits light by applying a current between the anode and the cathode, and an electron transport layer between the cathode and the luminescent layer that transports electrons from the cathode to the luminescent layer. The electron transport layer includes an n-type transport layer and a buffer layer in contact with the n-type electron transport layer. The n-type electron transport layer contains a first electron transport material and an electron donor material and is disposed to the cathode side of the buffer layer. The buffer layer contains a second electron transport material and is disposed to the luminescent layer side of the n-type electron transport layer so as to prevent the electron injection material from diffusing from the n-type electron transport layer to the luminescent layer.