Patent ID: 8119256

Claim:
An organic light emitting device comprising: an anode comprising an anode material and for injecting holes; an organic layer comprising a light emitting layer on the anode; and a cathode on the organic layer and through which light emitted from the light emitting layer passes, wherein the cathode comprises: a buffer layer comprising a material selected from the group consisting of fullerene, a metal-containing fullerene-based complex, carbon nanotube, carbon fiber, carbon black, graphite, carbyne, MgC 60 , SrC 60 , CaC 60 , C 60 , C 70 , MgO, YbO, and combinations thereof, a metal oxide layer comprising a metal oxide, and a metal layer comprising a metal having an absolute work function value lower than an absolute work function value of the anode material and coupled to the buffer layer and the metal oxide layer.