Organic light emitting device comprising a cathode, an anode, a light emitting layer (150, 151), at least one first electron transport layer and at least one second electron transport layer, wherein the light emitting layer, the first electron transport layer and the second electron transport layer are arranged between the cathode and the anode, wherein the first electron transport layer comprises a compound of formula L-M wherein in formula L is selected from the C 6 to C 60 unsubstituted or substituted aryl, wherein the one or more substituents, if present, are independently selected from C 2 to C 24 alkenyl, C 1 to C 20 alkyl, C 7 to C 32 aryl-alkyl, C 7 toC 32 aryl-alkenyl; M is substituted pyrimidine or substituted triazine, wherein the one or more substituents, are independently selected from C 6 to C 24 aryl wherein the C 6 to C 24 aryl may be unsubstituted or substituted with C 1 to C 3 alkyl; L and M may be connected via a direct bond or via a spacer moiety selected from non-condensed C 6 to C 18 aryl which may be unsubstituted or substituted wherein the one or more substituents, if present, are independently selected from C 6 to C 12 aryl, C 2 to C 20 heteroaryl, and phosphine oxide group; and the compound of formula has a molecular dipole moment of ≤ 5 Debye; wherein the second electron transport layer comprises a compound of formula wherein in formula A 1 is selected from unsubstituted or substituted C 10 to C 24 aryl comprising at least one aromatic ring system comprising at least two condensed 6-membered aromatic rings, wherein the one or more substituents, if present, are independently selected from C 6 to C 24 aryl, C 2 to C 20 heteroaryl and these substituents may be further substituted with a phosphine oxide group; X 1 is selected from unsubstituted or substituted C 6 to C 24 aryl, wherein the one or more substituents, if present, are independently selected from C 6 to C 12 aryl, C 2 to C 10 heteroaryl and these substituents may be further substituted with a phosphine oxide group or CN; Y 1 to Y 3 are independently selected from N and CR 2 provided that at least two of Y 1 to Y 3 are N, wherein the R 2 is selected from H or C 1 to C 3 alkyl; Z is selected from unsubstituted or substituted C 6 to C 24 aryl or unsubstituted or substituted C 8 to C 24 heteroaryl, wherein the one or more substituents, if present, are independently selected from C 6 to C 24 aryl, C 1 to C 20 alkyl, phosphine oxide group and CN; and R 1 is selected from unsubstituted or substituted C 6 to C 24 aryl, wherein the one or more substituents, if present, are independently selected from C 6 to C 24 aryl, C 1 to C 20 alkyl, phosphine oxide group and CN. wherein the first electron transport layer comprises a compound of formula L-M wherein in formula L is selected from the C 6 to C 60 unsubstituted or substituted aryl, wherein the one or more substituents, if present, are independently selected from C 2 to C 24 alkenyl, C 1 to C 20 alkyl, C 7 to C 32 aryl-alkyl, C 7 toC 32 aryl-alkenyl; M is substituted pyrimidine or substituted triazine, wherein the one or more substituents, are independently selected from C 6 to C 24 aryl wherein the C 6 to C 24 aryl may be unsubstituted or substituted with C 1 to C 3 alkyl; L and M may be connected via a direct bond or via a spacer moiety selected from non-condensed C 6 to C 18 aryl which may be unsubstituted or substituted wherein the one or more substituents, if present, are independently selected from C 6 to C 12 aryl, C 2 to C 20 heteroaryl, and phosphine oxide group; and the compound of formula has a molecular dipole moment of ≤ 5 Debye; wherein the second electron transport layer comprises a compound of formula wherein in formula A 1 is selected from unsubstituted or substituted C 10 to C 24 aryl comprising at least one aromatic ring system comprising at least two condensed 6-membered aromatic rings, wherein the one or more substituents, if present, are independently selected from C 6 to C 24 aryl, C 2 to C 20 heteroaryl and these substituents may be further substituted with a phosphine oxide group; X 1 is selected from unsubstituted or substituted C 6 to C 24 aryl, wherein the one or more substituents, if present, are independently selected from C 6 to C 12 aryl, C 2 to C 10 heteroaryl and these substituents may be further substituted with a phosphine oxide group or CN; Y 1 to Y 3 are independently selected from N and CR 2 provided that at least two of Y 1 to Y 3 are N, wherein the R 2 is selected from H or C 1 to C 3 alkyl; Z is selected from unsubstituted or substituted C 6 to C 24 aryl or unsubstituted or substituted C 8 to C 24 heteroaryl, wherein the one or more substituents, if present, are independently selected from C 6 to C 24 aryl, C 1 to C 20 alkyl, phosphine oxide group and CN; and R 1 is selected from unsubstituted or substituted C 6 to C 24 aryl, wherein the one or more substituents, if present, are independently selected from C 6 to C 24 aryl, C 1 to C 20 alkyl, phosphine oxide group and CN.