Tandem organic light-emitting element

A tandem organic light-emitting device comprising:

• a base substrate;
• a first electrode disposed on the base substrate;
• a second electrode facing the first electrode;
• three or more organic light-emitting layers disposed between the first electrode and the second electrode including a first organic light-emitting layer disposed on the first electrode, a second organic light-emitting layer disposed on the first organic light-emitting layer, and a third organic light-emitting layer disposed on the second organic light-emitting layer, each of the first, second and third organic light-emitting layers comprising an emissive layer, a hole layer disposed between the emissive layer and the first electrode, and an electron layer disposed between the emissive layer and the second electrode,
• wherein the hole layer has a multilayer structure comprised of a first hole layer and a second hole layer sequentially disposed on the emissive layer;
• a first charge generation layers disposed between the first organic light-emitting layer and the second organic light-emitting layer, and
• a second charge generation layer disposed between the second organic light-emitting layer and the third organic light-emitting layer,
• wherein the electron layer of each of the first, second and third organic light-emitting layers has a multilayer structure and comprises a first electron layer doped with a metal dopant and a second electron layer doped with an organic dopant,
• wherein the first electron layer and the second electron layer of the first organic light-emitting layer are sequentially disposed on the first charge generation layer between the emissive layer of the first organic light-emitting layer and the first charge generation layer,
• wherein the first electron layer and the second electron layer of the second organic light-emitting layer are sequentially disposed on the second charge generation layer between the emissive layer of the second organic light-emitting layer and the second charge generation layer, and
• wherein the first electron layer and the second electron layer of the third organic light-emitting layer are sequentially disposed on the second electrode between the emissive layer of the third organic light-emitting layer and the second electrode, and
• wherein a total thickness of the first to third organic light-emitting layers and the first and second charge generation layers is about 500 nm or less.