Tandem white organic light emitting device

A tandem white organic light emitting device comprising:

• a first electrode and a second electrode opposing each other;
• a charge generation layer formed between the first electrode and the second electrode;
• a first stack disposed between the first electrode and the charge generation layer, the first stack comprising a first light emitting layer emitting blue light;
• and
• a second stack disposed between the charge generation layer and the second electrode, the second stack comprising a second light emitting layer including one or more hosts doped with a phosphorescent dopant emitting light having a longer wavelength than blue light,
• wherein the charge generation layer comprises an n-type charge generation layer doped with a metal and a p-type charge generation layer made of an organic material and
• wherein an amount of metal doped in the n-type charge generation layer is 2% to 8% of the total volume of the n-type charge generation layer.