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. <EOS>