Patent ID: 8895969

Claim:
A white organic light emitting device comprising: a first electrode and a second electrode opposite to each other; a charge generation layer disposed between the first electrode and the second electrode; a first stack disposed between the first electrode and the charge generation layer and comprising a first light emitting layer emitting blue light; and a second stack disposed between the charge generation layer and the second electrode and comprising a second light emitting layer that comprises at least one host doped with a phosphorescent dopant emitting light with a longer wavelength than the blue light, wherein a structure comprising the first electrode and the layers disposed between the first electrode and the second electrode satisfies an optical path condition represented by the following equation with respect to emissions of the first and second stacks, n a ⁢ d a λ + ∑ ⁢ n w ⁢ d w λ = 1.85 ∼ 2.15 where λ is an emission peak wavelength of the first stack or the second stack, n a and d a are a refractive index and a thickness of a transparent electrode selected from the first and second electrode, and n w and d w are a refractive index and a thickness of any one of the layers disposed between the first electrode and the second electrode, respectively.