White organic light emitting device

An organic light emitting device comprising:

• first and second electrodes formed to face each other on a substrate;
• a first stack interposed between the first and second electrode and configured with a hole injection layer, a first hole transportation layer, a first light emission layer and a first electron transportation layer which are stacked on the first electrode;
• a second stack interposed between the first stack and the second electrode and configured with a second hole transportation layer, a second light emission layer, a third light emission layer and a second electron transportation layer which are stacked on the first stack;
• a third stack interposed between the second stack and the second electrode and configured with a third hole transportation layer, a fourth light emission layer, a third electron transportation layer and an electron injection layer which are stacked on the second stack;
• and
• a first charge generation layer interposed between the first and second stacks and a second charge generation layer interposed between the second and third stacks,
• wherein each of the first and fourth light emission layers is a blue fluorescent light emission layer including at least one host and a blue fluorescent dopant with a luminous peak wavelength band of 420 nm˜490 nm, and
• wherein the second and third light emission layers of the second stack are both disposed between the first and second charge generation layers and both the second and third light emission layers of the second stack come in contact with each other, one of the second and third light emission layers is one of green and yellow-green phosphorescent light emission layer including at least one host and a green phosphorescent dopant or a yellow-green phosphorescent dopant with a luminous peak wavelength band of 500 nm˜580 nm, and the other one of the second and third light emission layers is a red phosphorescent light emission layer including at least one host and a red phosphorescent dopant with a luminous peak wavelength band of 580 nm˜680 nm.