Light emitting device and display device including the same

A light emitting device, comprising:

• a first electrode and a second electrode with a surface facing the first electrode;
• an emission layer disposed between the first electrode and the second electrode and comprising a quantum dot;
• and
• an electron auxiliary layer disposed between the emission layer and the second electrode,
• wherein the electron auxiliary layer comprises a first layer proximate to the emission layer and comprising a plurality of nanoparticles comprising a first metal oxide, and a second layer disposed on the first layer and proximate to the second electrode, the second layer comprising a second metal oxide, and
• wherein an interface roughness between the second layer and the surface of the second electrode is less than about 10 nanometers as determined by an electron microscopy analysis, and
• wherein the first metal oxide is represented by Chemical Formula 1:
• Zn1-xMxO Chemical Formula 1
• wherein M is Mg, Ca, Zr, W, Li, Ti, Y, Al, or a combination thereof, and x is greater than 0 and less than or equal to 0.5, and
• wherein an amount of carbon in the second layer is less than or equal to 12 mol % based on a total mole amount of elements included in the second layer.