Oxadiazole derivative and its use as charge transport and light emitting material

An oxadiazole compound comprising one or more identical or different recurring units of formula I

• 23
• wherein
• W is a straight chain or branched alkylene group with 1 to 22 C-atoms, which is unsubstituted or is mono- or polysubstituted by F, Cl, Br, I or CN, wherein one or more CH2 groups may optionally be replaced, in each case independently from one another, by —O—, —S—, —NH—, —NR0—, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S—, —CH═CH—, —CF═CF— or —C≡C— in such a manner that N, O and/or S atoms are not linked directly to one another;
• R0 is in each case independently H or alkyl with 1 to 12 C-atoms;
• M is, if occuring twice or more, independently of each other, a mesogenic or mesogenity supporting group;
• Y1 to Y4 are in each case independently of each other H, F, Cl or CN;
• w is in each case independently 0 or 1;
• m1, m2 are in each case independently and independently of each other 0 or 1, whereby m1+m2≧1;
• and
• p1, p2 are in each case independently and independently of each other 0 or 1, whereby p1+p2≧1;
• with the proviso that formula I does not include
• 2-styryl-5-trichloromethyl-oxadiazole, 2-styryl-5-tribromomethyl-oxadiazole, 2-(alkylstyryl)-5-trichloromethyl-oxadiazole, 2-(alkylstyryl)-5-tribromomethyl-oxadiazole ,2-(alkoxystyryl)-5-trichloromethyl-oxadiazole, 2-(alkoxystyryl)-5-tribromomethyl-oxadiazole, 2-(4-chlorostyryl)-5-trichloromethyl-oxadiazole, 2-(4-chlorostyryl )-5-tribromomethyl-oxadiazole, 2-(4-styrylstyryl)-5-trichloromethyl-oxadiazole, 2-(4-styrylstyryl)-5-tribromomethyl-oxadiazole, 2-(benzofuran-2-yl )-5-trichloromethyl-oxadiazole, and 2-(benzofuran-2-yl)-5-tribromomethyl-oxad iazole.