Patent ID: 7638794

Claim:
An organic electroluminescent device comprising: a substrate; a first electrode on the substrate; an organic electroluminescent layer on the first electrode; a mixed layer on the organic electroluminescent layer, the mixed layer including a first material having at least one of an alkali metal, an alkaline earth metal, or a compound thereof, and a second material having an adhesive material for increasing adhesion between the mixed layer and the organic electroluminescent layer; a second electrode on the mixed layer; wherein a concentration gradient of the first material is zero at an interface between the organic electroluminescent layer and the layer, mixed and the concentration gradient of the material increases gradually in a direction of an interface between the mixed layer and the second electrode, and a concentration gradient of the second material is zero at the interface between the mixed layer and the second electrode, and the concentration gradient of the second material increases gradually in the direction of the interface between the organic electroluminescent layer and the mixed layer.