Formulation containing at least one organic functional material selected from the group consisting of hole-injecting, hole-transporting, emitting, electron-transporting and electron-injecting materials, and at least a first and a second solvent, which is different from the first solvent, characterized in that the content of the first solvent is in the range from 1 to 25 vol.-% based on the total amount of solvents in the formulation, in that the first solvent has a boiling point in the range from 252 to 350°C, in that the second solvent has a boiling point in the range from 150 to 350°C, and in that the first solvent is a cyclosiloxane according to general formula wherein R 1 and R 2 are identical or different at each occurrence, and are H, D, F, Cl, Br, I, NO 2, CN, a straight-chain alkyl or alkoxy group having from 1 to 20 carbon atoms or a branched or cyclic alkyl or alkoxy group having from 3 to 20 carbon atoms, in which one or more nonadjacent CH 2 groups may be replaced by -O-, -S-, -NR 5 -, -CONR 5 -, -CO-O-, -C=O-, -CH=CH- or -C≡C-, and in which one or more hydrogen atoms may be replaced by F, or an aryl or heteroaryl group which has from 4 to 14 carbon atoms and may be substituted by one or more nonaromatic R 5 radicals, and a plurality of substituents R 5, either on the same ring or on the two different rings, may together in turn form a mono- or polycyclic, aliphatic or aromatic ring system; R 5 are identical or different at each instance, and are a straight-chain alkyl or alkoxy group having from 1 to 20 carbon atoms or a branched or cyclic alkyl or alkoxy group having from 3 to 20 carbon atoms, in which one or more nonadjacent CH 2 groups may be replaced by -O-, -S-, -CO-O-, -C=O-, -CH=CH- or -C≡C-, and in which one or more hydrogen atoms may be replaced by F, or an aryl or heteroaryl group which has from 4 to 14 carbon atoms and may be substituted by one or more nonaromatic R 5 radicals; and n is 4, 5, 6 or 7, preferably 5 or 6. R 1 and R 2 are identical or different at each occurrence, and are H, D, F, Cl, Br, I, NO 2, CN, a straight-chain alkyl or alkoxy group having from 1 to 20 carbon atoms or a branched or cyclic alkyl or alkoxy group having from 3 to 20 carbon atoms, in which one or more nonadjacent CH 2 groups may be replaced by -O-, -S-, -NR 5 -, -CONR 5 -, -CO-O-, -C=O-, -CH=CH- or -C≡C-, and in which one or more hydrogen atoms may be replaced by F, or an aryl or heteroaryl group which has from 4 to 14 carbon atoms and may be substituted by one or more nonaromatic R 5 radicals, and a plurality of substituents R 5, either on the same ring or on the two different rings, may together in turn form a mono- or polycyclic, aliphatic or aromatic ring system; R 5 are identical or different at each instance, and are a straight-chain alkyl or alkoxy group having from 1 to 20 carbon atoms or a branched or cyclic alkyl or alkoxy group having from 3 to 20 carbon atoms, in which one or more nonadjacent CH 2 groups may be replaced by -O-, -S-, -CO-O-, -C=O-, -CH=CH- or -C≡C-, and in which one or more hydrogen atoms may be replaced by F, or an aryl or heteroaryl group which has from 4 to 14 carbon atoms and may be substituted by one or more nonaromatic R 5 radicals; and n is 4, 5, 6 or 7, preferably 5 or 6.