| abstract |
The invention relates to a use of a compound according to formula (1), wherein each of R1, R2, R1', R2' is independently selected from H, C1-C6 alkyl, C1-C6 haloalkyl and C6-C10 aryl or both substituents on the same aromatic ring of the xanthene skeleton are hydrocarbyi groups linked with each other to form together an anelated divalent C2-C10 hydrocarbyi group; X and X' are independently selected from C and N, R5 is H if X is C, R5' is H if X' is C, R5 is lone electron pair if X is N, R5' is lone electron pair if X' is N, and each of R3, R4, R3', R4' is independently selected from H and C6-C10 aryl, with the proviso that neither both R3, R4 nor both R3', R4' are aryl at the same time and if X is C, R3and R4 are not H at the same time, and if X' is C, R3' and R4' are not H at the same time, or both substituents on the same phenyl or pyridyl ring are hydrocarbyi groups linked with each other to form together a divalent C4-C10 hydrocarbyi group representing an anelated, substituted or unsubstituted, six-membered aromatic ring; in an electron transporting layer or in an electron injecting layer comprised in an electronic device. |