Light emitting diode and light emitting diode display including the same

A light emitting diode, comprising:

• a first electrode;
• a second electrode overlapping the first electrode;
• an emission layer between the first electrode and the second electrode;
• and
• an electron injection layer between the second electrode and the emission layer,
• wherein the electron injection layer includes a lanthanide element, an alkali metal first element, and a halogen second element, and
• the lanthanide element has a work function of 2.7 eV or less.

A light emitting diode display, comprising:

• a substrate;
• a thin film transistor on the substrate;
• and
• a light emitting diode connected to the thin film transistor,
• wherein:
• the light emitting diode includes a first electrode, a second electrode overlapping the first electrode, an emission layer between the first electrode and the second electrode, and an electron injection layer between the second electrode and the emission layer,
• the electron injection layer includes a lanthanide element, an alkali metal first element, and a halogen second element and
• the first element and the second element are included in the electron injection layer in an amount of 1 vol % to 20 vol %, based on a total volume of a material including the lanthanide element, the first element, and the second element.