TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The solubility of the n-type organic semiconductor in the first solvent is higher than in the second solvent, and the solubility of the p-type organic semiconductor in the second solvent is higher than in the first solvent. The solubility of the n-type organic semiconductor in the first solvent is lower than in the second solvent, and the solubility of the p-type organic semiconductor in the second solvent is lower than in the first solvent. The p-type organic semiconductor is: a conjugated organic polymer, a noncrystalline or semi-crystalline conjugated organic polymer; and a conjugated organic polymer with a band gap of 2.1 electron volt (eV). The n-type organic semiconductor is a fullerene or fullerene derivative. Preferred Process: The organic electronic device comprises an anode, a cathode, and an active layer which is formed from the formulation or which is formed by step (c) of the process.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The formulation comprises at least one second solvent, which is different from the first solvent. The first solvent is alkylated benzene, alkoxylated benzene, indane, alkylated indane, alkoxylated indane, tetralin, alkylated tetralin, naphthalene, alkylated naphthalene, anisole, alkylated anisole, linear or cyclic ketones, aromatic and/or aliphatic ethers, aromatic alcohols, optionally substituted thiophenes, benzothiophenes, alkoxylated naphthalene, substituted benzothiazoles, alkyl benzoates or aryl benzoates. The concentration of the first solvent is the same as or higher than the concentration of the second solvent. The first solvent has a boiling point greater than or equal to 150 degrees C and the second solvent has a boiling point greater than or equal to 100 degrees C. The boiling point of the first solvent is greater than the boiling point of the second solvent. The first solvent is: tetralin that is substituted by two or more alkyl groups, preferably 1,5-dimethyltetralin; naphthalene that is substituted by one or more alkyl groups, preferably 1-methylnaphthalene; and anisole that is substituted by one or more alkyl groups, preferably dimethylanisole. The second solvent is veratrole, 1,5-dimethyltetralin, 1-methylnaphthalene, indane (all preferred), xylene (including o-, m- and p-dimethyl benzene either as pure isomers or as isomer mixture), cymene (including o-, m- and p-methyl isopropyl benzene either as pure isomers or as isomer mixture), anisole, tetralin, naphthalene, 1-ethylnaphthalene, 2-ethyl-naphthalene, 1,2-dimethylnaphthalene, 1,3-dimethylnaphthalene, 1,4-dimethylnaphthalene, 2,6- dimethylnaphthalene, 2,7-diisopropyl-naphthalene, cyclopentanone, cyclohexanone, 2,4-dimethylanisole, 1,2-dihydronapthalene, decalin, diphenyl ether, cyclohexyl benzene, methyl phenyl acetate, phenyl acetate, benzyl acetate, ethyl benzoate, gamma -terpinene, benzothiophene, thiophene, 1-methoxynaphthalene, benzyl alcohol, cyclohexanol, indene,1,4-dioxane, ethylene glycol monobutyl ether, diethyl ether, N-methylpyrrolidone, diethyl phthalate, benzyl benzoate, ethyl benzoate, acetophenone, propiophenone, 2-heptanone, cyclohexanone, benzothiazole, benzonitrile, bicyclohexyl or methyl isobutyl ketone. The ratio of the first and the second solvent is 50:50-95:5. EXAMPLE - 1,5-Dimethyltetralin and m-xylene were mixed in a 85:15 volume% ratio and 4-(5-benzo(1,2-b;4,5-b')dithiophen-2-yl-thiophen-2-yl)-7-thiophen-2-yl-benzo(1,2,5)thiadiazole of formula (I) (where x and y are not defined) and poly(3-hexylthiophene) (1:2 mass%) were added to the solvent mixture in an inert atmosphere. The solution was heated overnight at 60 degrees C, and heated to 90 degrees C for 1 hour,