Formulation containing at least one organic functional material and at least a first organic solvent, wherein said first organic solvent contains at least one norbornene group, preferably one norbornene group, wherein the first organic solvent, which contains at least one norbornene group, is a solvent according to general formula (I) wherein R 1 , R 2 and R 3 are H; Sp is a straight-chain alkyl group having from 1 to 20, preferably from 1 to 12, carbon atoms or a branched alkyl group having from 3 to 20, preferably from 3 to 12, carbon atoms, in which one or more non-adjacent CH 2 groups may be replaced by -O-, -S-, -O-CO-, -CO-O- or -C=O-; R 4 is H, or a mono- or polycyclic, alicyclic or heterocyclic ring system, which has from 3 to 14 ring atoms, a mono- or polycyclic aromatic ring system, which has from 6 to 14 ring atoms, or a mono- or polycyclic heteroaromatic ring system, which has from 5 to 14 ring atoms, each of these ring systems may be substituted by one or more nonaromatic R 5 radicals; 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 non-adjacent 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, wherein the first solvent has a boiling point in the range from 100 to 400°C and wherein the at least one organic functional material is selected from the group consisting of fluorescent emitters, phosphorescent emitters, host materials, matrix materials, exciton-blocking materials, electron-transport materials, electron-injection materials, hole-conductor materials, hole-injection materials, n-dopants, p-dopants, wide-band-gap materials, electron-blocking materials and hole-blocking materials. R 1 , R 2 and R 3 are H; Sp is a straight-chain alkyl group having from 1 to 20, preferably from 1 to 12, carbon atoms or a branched alkyl group having from 3 to 20, preferably from 3 to 12, carbon atoms, in which one or more non-adjacent CH 2 groups may be replaced by -O-, -S-, -O-CO-, -CO-O- or -C=O-; R 4 is H, or a mono- or polycyclic, alicyclic or heterocyclic ring system, which has from 3 to 14 ring atoms, a mono- or polycyclic aromatic ring system, which has from 6 to 14 ring atoms, or a mono- or polycyclic heteroaromatic ring system, which has from 5 to 14 ring atoms, each of these ring systems may be substituted by one or more nonaromatic R 5 radicals; 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 non-adjacent 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, <EOS>