An organic light emitting device which has an anode, i.e. a lower electrode, made of a single metal layer in a top emission structure, and a method of fabricating the same are provided. The organic light emitting device is constructed with a substrate, an anode disposed on the substrate and including a metal, a metal fluoride layer disposed on the anode, an organic layer disposed on the metal fluoride layer and including at least an organic emission layer, and a cathode disposed on the organic layer.