An organic light emitting device comprising: an anode; a hole transport layer; a light emitting layer; an electron transport layer, an electron injection layer, or an electron transport and injection layer; and a cathode, wherein the light emitting layer comprises a compound represented by the following Chemical Formula 1, and the electron transport layer, the electron injection layer, or the electron transport and injection layer comprises at least one of the compound represented by the following Chemical Formula 2 and the compound represented by Chemical Formula 3: in the Chemical Formula 1, Z is O or S, L 1 is a direct bond; or substituted or unsubstituted C 6-60 arylene, Ar 1 is substituted or unsubstituted C 6-60 aryl, R 1 to R 3 are each independently hydrogen; deuterium; or substituted or unsubstituted C 6-60 aryl, or two adjacent substituents of R 1 to R 3 are combined to form a benzene ring, n is an integer of 0 to 8, m is an integer of 0 to 4, and o is an integer of 0 to 3, in the Chemical Formula 2 or 3, R 4 to R 7 are each independently hydrogen, or deuterium, p1 to p4 are an integer of 1 to 4, L 2 and L 3 are each independently a direct bond; or substituted or unsubstituted C 6-60 arylene, and Ar 2 and Ar 3 are each independently a substituent represented by the following Chemical Formula 4, in the Chemical Formula 4, X 1 to X 5 are each independently N or CR 8, wherein at least two of X 1 to X 5 are N, and each R 8 is independently hydrogen; deuterium; substituted or unsubstituted C 1-20 alkyl; substituted or unsubstituted C 6-60 aryl; or substituted or unsubstituted C 2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S, or two adjacent R 8 s are combined to form a benzene ring. an anode; a hole transport layer; a light emitting layer; an electron transport layer, an electron injection layer, or an electron transport and injection layer; and a cathode, wherein the light emitting layer comprises a compound represented by the following Chemical Formula 1, and the electron transport layer, the electron injection layer, or the electron transport and injection layer comprises at least one of the compound represented by the following Chemical Formula 2 and the compound represented by Chemical Formula 3: in the Chemical Formula 1, Z is O or S, L 1 is a direct bond; or substituted or unsubstituted C 6-60 arylene, Ar 1 is substituted or unsubstituted C 6-60 aryl, R 1 to R 3 are each independently hydrogen; deuterium; or substituted or unsubstituted C 6-60 aryl, or two adjacent substituents of R 1 to R 3 are combined to form a benzene ring, n is an integer of 0 to 8, m is an integer of 0 to 4, and o is an integer of 0 to 3, in the Chemical Formula 2 or 3, R 4 to R 7 are each independently hydrogen, or deuterium, p1 to p4 are an integer of 1 to 4, L 2 and L 3 are each independently a direct bond; or substituted or unsubstituted C 6-60 arylene, and Ar 2 and Ar 3 are each independently a substituent represented by the following Chemical Formula 4, in the Chemical Formula 4, X 1 to X 5 are each independently N or CR 8, wherein at least two of X 1 to X 5 are N, and each R 8 is independently hydrogen; deuterium; substituted or unsubstituted C 1-20 alkyl; substituted or unsubstituted C 6-60 aryl; or substituted or unsubstituted C 2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S, or two adjacent R 8 s are combined to form a benzene ring.