Patent ID: 8274212

Claim:
An organic light emitting device, comprising: a first electrode; a second electrode; an emissive layer disposed between the first electrode and the second electrode; a first hole injection layer disposed between the first electrode and the second electrode; and a second hole injection layer, wherein the first hole injection layer comprises a metal fluoride and a first organic hole injection layer forming compound, wherein the metal fluoride comprises a metal that is one of a Group 1 element and a Group 2 element, and the second hole injection layer comprises a metal oxide and a second organic hole injection layer forming compound, wherein the second hole injection layer is disposed between the first hole injection layer and the emissive layer, and wherein a thickness ratio of the first hole injection layer to the second hole injection layer is in a range of 1:99 to 1:9; and wherein the first hole injection layer is disposed between the second hole injection layer and an anode so that the second hole injection layer comprising the metal oxide is separate from the anode.