Patent ID: 7659556

Claim:
A light emitting device comprising: a substrate; and a light emitting element over the substrate, wherein the light emitting element further comprises a first electrode, a light emitting layer, an electron injection layer, and a second electrode, wherein the electron injection layer comprises a material represented by general formula 1 and at least one of an alkali metal, an alkali earth metal, and a transition metal, wherein each of X 1 and X 2 represents: wherein R 1 to R 8 represents hydrogen, halogen, a cyano group, an alkyl group having 1 to 10 carbon atoms, a haloalkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group.