An organic light emitting diode comprising: a cathode; an anode provided to face the cathode; a light emitting layer provided between the cathode and the anode; an electron transporting layer provided between the cathode and the light emitting layer; and an electron adjusting layer provided between the light emitting layer and the electron transporting layer, wherein the electron transporting layer comprises an organic compound containing an aromatic hetero ring represented by the following Formula 2, the electron adjusting layer comprises a heterocyclic compound represented by the following Formula 1, and an ionization potential (Ip m) of the electron transporting layer is larger than an ionization potential (IP a) of the electron adjusting layer: in Formula 1, X1 is CR1 or N and X2 is CR2 or N, Y1 is CR5 or N, Y2 is CR6 or N, Y3 is CR7 or N, and Y4 is CR8 or N, Z1 is CR9 or N, Z2 is CR10 or N, Z3 is CR11 or N, and Z4 is CR12 or N, X1, X2, Y1 to Y4, and Z1 to Z4 are not simultaneously N, and R1, R2, and R5 to R12 are the same as or different from each other, and are each independently hydrogen; deuterium; a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms; or a substituted or unsubstituted phosphine oxide group, or adjacent substituents of R1, R2, and R5 to R12 combine with each other to form a substituted or unsubstituted hydrocarbon ring; or a substituted or unsubstituted hetero ring, In Formula 2, X5 and X6 are the same as or different from each other, and are each independently N or CH, and Ar1 to Ar3 are the same as or different from each other, and are each independently a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; or a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms. a cathode; an anode provided to face the cathode; a light emitting layer provided between the cathode and the anode; an electron transporting layer provided between the cathode and the light emitting layer; and an electron adjusting layer provided between the light emitting layer and the electron transporting layer, wherein the electron transporting layer comprises an organic compound containing an aromatic hetero ring represented by the following Formula 2, the electron adjusting layer comprises a heterocyclic compound represented by the following Formula 1, and an ionization potential (Ip m) of the electron transporting layer is larger than an ionization potential (IP a) of the electron adjusting layer: in Formula 1, X1 is CR1 or N and X2 is CR2 or N, Y1 is CR5 or N, Y2 is CR6 or N, Y3 is CR7 or N, and Y4 is CR8 or N, Z1 is CR9 or N, Z2 is CR10 or N, Z3 is CR11 or N, and Z4 is CR12 or N, X1, X2, Y1 to Y4, and Z1 to Z4 are not simultaneously N, and R1, R2, and R5 to R12 are the same as or different from each other, and are each independently hydrogen; deuterium; a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms; or a substituted or unsubstituted phosphine oxide group, or adjacent substituents of R1, R2, and R5 to R12 combine with each other to form a substituted or unsubstituted hydrocarbon ring; or a substituted or unsubstituted hetero ring, In Formula 2, X5 and X6 are the same as or different from each other, and are each independently N or CH, and Ar1 to Ar3 are the same as or different from each other, and are each independently a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; or a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms. X1 is CR1 or N and X2 is CR2 or N, Y1 is CR5 or N, Y2 is CR6 or N, Y3 is CR7 or N, and Y4 is CR8 or N, Z1 is CR9 or N, Z2 is CR10 or N, Z3 is CR11 or N, and Z4 is CR12 or N, X1, X2, Y1 to Y4, and Z1 to Z4 are not simultaneously N, and R1, R2, and R5 to R12 are the same as or different from each other, and are each independently hydrogen; deuterium; a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms; or a substituted or unsubstituted phosphine oxide group, or adjacent substituents of R1, R2, and R5 to R12 combine with each other to form a substituted or unsubstituted hydrocarbon ring; or a substituted or unsubstituted hetero ring, In Formula 2, X5 and X6 are the same as or different from each other, and are each independently N or CH, and Ar1 to Ar3 are the same as or different from each other, and are each independently a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; or a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms. X5 and X6 are the same as or different from each other, and are each independently N or CH, and Ar1 to Ar3 are the same as or different from each other, and are each independently a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; or a substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms.