TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The organic solvent comprises one or more aromatic and/or heteroaromatic compound, preferably one or more aromatic hydrocarbon compounds. The organic semiconductor compound is organic light-emitting material and/or charge-transporting material. The organic semiconductor compound comprises polyacene derivative of formula (M1). The organic light-emitting material and/or charge transporting material having molecular weight of 5000 g/mol or more is an organic phosphorescent compound which emits light and contains one or more atom having atomic number more than 38. The organic phosphorescent compound comprises iridium-containing phosphorescent compound of formula (I) or (II) and/or platinum-containing phosphorescent compound of formula (III) or (IV). The formulation comprises 0.1-10 wt.% organic semiconductor compound having molecular weight of 5000 g/mol or less. The formulation comprises at least one wetting agent. The content of organic solvent in the formulation is 80 wt.% or more.R1-R12=H, or 1-40C carbyl or hydrocarbyl, 1-40C alkoxy, 6-40C aryloxy, 7-40C alkylaryloxy, 2-40C alkoxycarbonyl, or 7-40C aryloxycarbonyl (all optionally substituted), cyano, carbamoyl, haloformyl of formula: -C(=O)-X, formyl, isocyano, isocyanato, thiocyanato, thioisocyanato, optionally substituted amino, hydroxy, nitro, CF3, Cl, Br, F, or optionally substituted silyl or alkynylsilyl;X=halo;R1+R2,R2+R3,R3+R4,R7+R8,R8+R9,R9+R10=4-40C saturated or unsaturated ring optionally intervened by O, S, or group of formula: -N(R'a)-;R'a=H or optionally substituted hydrocarbyl;n=0-4;DCy=cyclyl containing at least one donor atom, preferably N, C in the form of carbene or P, and substituents R18;CCy=cyclyl containing carbon atom and substituents R18;A=monoanionic, bidentate chelating ligand, preferably diketonate ligand;R18=F, Cl, Br, I, NO2, CN, linear, branched or cyclic 1-20C alkyl or alkoxy, in which one or more nonadjacent CH2 is replaced by -O-, -S-, -NR19-, -CONR19-, -CO-O-, -C=O-, -CH=CH- or -CC-, and in which one or more H is optionally replaced by F, or 4-14C aryl or heteroaryl optionally substituted by one or more non-aromatic R18;andR19=linear, branched or cyclic 1-20C alkyl or alkoxy, in which one or more nonadjacent CH2 groups are optionally replaced by -O-, -S-, -CO-O-, -C=O-, -CH=CH- or -CC-, and in which one or more H is optionally replaced by F, or 4-14C aryl or heteroaryl optionally substituted by one or more non-aromatic R18.(i) one or more carbon atoms of the polyacene skeleton is optionally substituted by heteroatom chosen from N, P, As, O, S, Se and Te; (ii) two or more substituents R1-R12 located on adjacent ring positions of the polyacene skeleton optionally form saturated or unsaturated 4-40C ring optionally intervened by O, S or -N(R'a), or aryl; (iii) several R18 optionally form mono- or polycyclic, aliphatic ring or aryl; and (iv) groups DCy and CCy are connected to one another via a covalent bond. Preferred Properties: The organic solvent comprises 80 wt.% or less compounds having viscosity less than 15 mPa.second, at 25 degrees C.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polymeric binder comprises a polymer containing 30 wt.% or more repeating units derived from styrene monomers and/or olefins. The polymer comprises 85 wt.% repeating units derived from styrene monomers. The formulation comprises 0.1-10 wt.% polymeric binder.