White organic light emitting device

A white 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 sequentially 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 sequentially 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 sequentially stacked on the second stack;
• and
• charge generation layers interposed between the first and second stacks and between the second and third stacks and configured to adjust a charge balance between the stacks,
• wherein each the first and fourth light emission layers is a blue fluorescent light emission layer with a single-peaked luminous property, the second and third light emission layers of the second stack have a two-peaked luminous property and 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, and the other one of the second and third light emission layers is a red phosphorescent light emission layer.