NOVELTY - Formulation comprises at least one solvent and at least one functional compound (I). The molecular weight of the functional compound is at least 550 g/mol. The solvent-providing structural element B1 is an aromatic compound (L1).    USE - (I) or formulation is useful in electronic devices comprising organic electroluminescent device, polymeric electroluminescent device, organic integrated circuit, organic field-effect transistor, organic thin film transistor, an organic light-emitting transistor, an organic Solar cell, an organic optical detector, an organic photoreceptor, an organic field-quench device, a light-emitting electrochemical cell or an organic laser diode (all claimed).    ADVANTAGE - The device comprising (I): is simple and energy efficient; exhibits improved performance and durability; and retains good efficiency over a wide temperature range.    DETAILED DESCRIPTION - Formulation comprises at least one solvent and at least one functional compound of formula A-(B1)k (I). The molecular weight of the functional compound is at least 550 g/mol. The solvent-providing structural element B1 is an aromatic compound of formula (L1).    A = functional structural element;    B1 = solvent-providing structural element;    k = 1-20, preferably greater than or equal to 2 or 3;    Ar1, Ar2 = aryl or heteroaryl, which can be substituted with at least one R;    X = N or CR2, preferably CH; either    R1, R2 = H, linear 1-40C alkyl, 1-40C alkoxy or 1-40C thioalkoxy, or branched or cyclic 3-40C alkyl, 3-40C alkoxy or 3-40C thioalkoxy, or 1-40C silyl, or substituted 1-40C keto, 2-40C alkoxycarbonyl, 7-40C aryloxycarbonyl, -CN, -C(=O)NH2, -C(=O)-X1, -C(=O)-H, isocyano, isocyanate, thiocyanate or thioisocyanate, OH, NO2, CF3, Cl, Br, F, a cross-linkable group, or optionally substituted (hetero)aromatic ring with 5-60 ring atoms, and/or aryloxy or heteroaryloxy with 5-60 ring atoms; or    R1+R2 = monocyclic or polycyclic, aliphatic or aromatic ring system;    I1 = 0-4;    dashed linkage = linkage to the functional structure element A;    X1 = halo; and    R = not defined.    INDEPENDENT CLAIMS are also included for:    (1) the functional compound (I) with the exclusion of substituted diphenyl-methanone compound of formula (III); and    (2) producing an electronic device by applying the formulation on a substrate and drying.    R7 = H or aromatic or heteroaromatic ring system having 5-60 aromatic ring atoms, which can be substituted by at least one R8, or N(Ar3)2, Si(Ar3)3, C(=O)Ar3, OAr3, AR3SO2, Ar3SO2, P(Ar3)2, P(O)(Ar3)2 or B(Ar)2;    R8 = H, D, F, Cl, Br, I, CHO, N(Ar3)2, C(=O)Ar3, P(=O)(Ar3)2, S(=O)Ar3, S(=O)2Ar3, CR7=CR7Ar3, CN, NO2, Si(R10)2, B(OR10)2, B(R10)2, B(N(R10)2)2, OSO2R10, a straight chain 1-40C alkyl, 1-40C alkoxy or 1-40C thioalkoxy or a branched or cyclic 3-40C alkyl, 3-40C alkoxy or 3-40C thioalkoxy, which can be respectively substituted by at least one R10, where at least one non-adjacent CH2 groups can be replaced by R10C=CR10, CC, Si(R10)2, Ge(R10)2, Sn(R10)2, C=O, C=S, C=Se, C=NR10, P(=O)(R10), SO, SO2, NR10, O, S or CONR10, where at least one H is replaced by F, Cl, Br, I, CN or NO2, or aromatic or heteroaromatic ring system having 5-60 aromatic ring atoms, which can be respectively substituted by R10, and/or aryloxy or heteroaryloxy having 5-60 aromatic ring atoms, which can be substituted by at least one R10; either    R9 = H, D, F or linear alkyl group having 1-20C or branched or cyclic alkyl group having 3-20C; or    many R7 = ring system;    R10 = H, D or aliphatic, aromatic and/or heteroaromatic hydrocarbon having 1-20C, in which H atoms can be replaced by F; and either    Ar3 = aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which can be substituted with at least one non-aromatic R8; or    2Ar3 with N, P or B via single bond or a bridge = B(R10), C(R10)2, Si(R10)2, C=O, C=NR10, C=C(R10)2, O, S, S=O, SO2, N(R10), P(R10) or P(=O)R10.