Organic Electronic Device and a Compound

An organic electronic device comprising at least one electron injection layer, wherein the electron injection layer comprises a compound of the formula (I)

• [L1]n-Ar1-[L2]m (Ia)
• wherein
• L1 has the formula 2:
• L2 has the formula 3:
• and
• Ar1 has the formula 4:
• wherein
• Ar2 to Ar5 are independently selected from C6 to C60 aryl(ene) or C2 to C42 heteroaryl(ene),
• wherein each Ar2 to Ar5 may independently be unsubstituted or substituted with one or more substituents independently selected from the group consisting of C6 to C12 aryl, C3 to C11 heteroaryl, C1 to C6 alkyl, D, C1 to C6 alkoxy, C3 to C6 branched alkyl, C3 to C6 cyclic alkyl, C3 to C6 branched alkoxy, C3 to C6 cyclic alkoxy, partially or perfluorinated C1 to C6 alkyl, partially or perfluorinated C1 to C6 alkoxy, partially or perdeuterated C1 to C6 alkyl, partially or perdeuterated C1 to C6 alkoxy, halogen, CN and PY(R10)2, wherein Y is selected from O, S or Se, and R10 is independently selected from C6 to C12 aryl, C3 to C12 heteroaryl, C1 to C6 alkyl, C1 to C6 alkoxy, partially or perfluorinated C1 to C6 alkyl, partially or perfluorinated C1 to C6 alkoxy, partially or perdeuterated C1 to C6 alkyl, partially or perdeuterated C1 to C6 alkoxy;
• L1 and L2 are bonded at “*” via a single bond independently to the same or different Ar2 to Ar5;
• X1 and X2 are independently selected from O, S and Se;
• R1 to R4 are independently selected from the group consisting of substituted or unsubstituted C1 to C16 alkyl and substituted or unsubstituted C6 to C12 aryl;
• wherein if one or more of R1 to R4 is substituted, the one or more substituents are independently selected from the group consisting of C1 to C16 alkyl, C6 to C18 arylene and C2 to C12 heteroarylene;
• and
• m and n are independently selected from 1 to 5, wherein n is an integer number.