An organic light emitting diode including a first electrode; a second electrode facing the first electrode; and an emissive layer disposed between the first electrode and the second electrode. The emissive layer includes at least one emitting material layer that includes a first compound including a first organic compound represented by Chemical Formula 1, and a second compound including an organometallic compound represented by Chemical Formula 4. The first organic compound may include multiple aromatic and heteroaromatic fused rings. The second compound may be a phosphorescent material. The first compound may have a wide plate-like structure and the first compound may receive efficiently exciton energy from the second compound. The present disclose also relates to an organic light emitting device including the diode. The luminous efficiency, luminous lifespan and color purity of the diode and device may be improved by introducing the first and second compounds into the emissive layer.