An organic light emitting device including a first electrode, a second electrode facing the first electrode, and an organic layer between the first electrode and the second electrode, wherein the organic layer includes an electron transport layer (ETL), and the electron transport layer (ETL) includes a compound represented by the following Chemical Formula 1 and an alkali metal complex. In the above chemical formula, X, L1, L2 and L3, R1, R2, and R3 are the same as defined in the detailed description.