An organic light emitting device including: a first electrode, a hole injection layer on the first electrode, a hole transport layer on the hole injection layer, an organic light emitting layer on the hole transport layer, a first electron transport layer on the organic light emitting layer, a second electron transport layer on the organic light emitting layer, an electron injection layer on the second electron transport layer and a second electrode on the electron injection layer, where the first electron transport layer includes a first material for improving a thermal stability, a second material for improving a luminous efficiency and a third material for reducing a driving voltage, and the second electron transport layer is laminated with the first electron transport layer, and the second electrode faces the first electrode.