Patent ID: 8911884

Claim:
An organic light emitting device comprising: a substrate; a first electrode; a second electrode; and an organic layer comprising an emission layer between the first electrode and the second electrode, and a first intermediate layer, a second intermediate layer and a third intermediate layer interposed between the first electrode and the emission layer, wherein the first electrode, the first intermediate layer, the second intermediate layer, the third intermediate layer, and the emission layer are sequentially stacked in this order; and the first intermediate layer comprising a first host material and a first dopant material, the second intermediate layer consisting of the first dopant material, and the third intermediate layer comprising a second host material and the first dopant material; and the first dopant material is a C 6 -C 30 aromatic compound substituted with at least one group selected from a cyano group and a fluorine group or a C 6 -C 30 heteroaromatic compound substituted with at least one group selected from a cyano group and a fluorine group; a highest occupied molecular orbital (HOMO) level of each of the first host material and the second host material is in a range of −5.5±1.0 eV; and a lowest unoccupied molecular orbital (LUMO) level of the first dopant material is in a range of −5.5±1.0 eV.