US Patent 11063231 Light emitting device and display device including the same

An electroluminescent device including an anode and a cathode facing each other, an emission layer disposed between the anode and the cathode, the emission layer including quantum dots, a hole auxiliary layer disposed between the emission layer and the anode and an electron auxiliary layer disposed between the emission layer and the cathode, wherein the electroluminescent device is configured such that electrons are dominant in the emission layer and a logarithmic value (log (HT/ET)) of a hole transport capability (HT) relative to an electron transport capability (ET) is less than or equal to about −1, or the electroluminescent device is configured such that holes are dominant in the emission layer and the logarithmic log value (log (HT/ET)) of the hole transport capability (HT) relative to the electron transport capability (ET) is greater than or equal to about 0.5.