NOVELTY - Nitrogen containing heteroaryl compounds (Q) are new.    USE - (Q) are useful as hole transport material in a hole-transport or hole injection layer, matrix materials in an emitting layer, an electron-blocking material, exciton blocking material and a material for an intermediate layer of an electronic device, where the electronic device is organic LED, organic integrated circuits, organic field-effect transistors, organic thin-film transistors, organic light-emitting transistors, organic solar cells, organic optical detectors, organic photoreceptors, organic field-quench devices, light emitting electrochemical cells and organic laser diodes. (Q) are useful in an oligomer, a polymer or a dendrimer and to prepare a formulation (all claimed).    ADVANTAGE - (Q) provide electronic devices with improved power efficiency, service life, high thermal stability, external quantum efficiencies and small operation voltage.    DETAILED DESCRIPTION - Nitrogen containing heteroaryl compounds (Q) of formulae (I)-(III) are new.    A = C(R1)2 or an aryl group of formula (a);    Z = N or CR1, when a group is boned to appropriate position, then it is C;    Ar1, Ar3 = 5-30 membered (hetero)aryl ring system optionally substituted by R1;    Ar2, Ar4 = 6-30 membered arylene or 5-14 membered heteroarylene (both optionally substituted by R1);    X = a single bond, C(R1)z, C=O, Si(R1)2, NR1, O, S, S=O or S(=O)2;    R1 = linear 1-20C-alkyl, linear 1-20C-alkoxy, linear 1-20C-thioalkyl, branched or cyclic 3-20C-alkyl, branched or cyclic 3-20C-alkoxy, branched or cyclic 3-20C-thioalkyl, 2-20C-alkenyl, 2-20C-alkynyl (where one or more CH2 group are optionally replaced by R2C=CR2-, -CC-, Si(R2)2, C=O, C=S, C=NR2, -C(=O)O-, -C(=O)NR2-, NR2, P(=O)(R2), -O-, -S-, SO or SO2 and one or more H atoms are optionally replaced by D, F, Cl, Br, I, CN or NO2), 5-30 membered (hetero)aryl ring system, 5-30 membered (hetero)aryloxy (all optionally substituted by R2), H, D, F, Cl, Br, I, B (OR2)2, CHO, C(=O)R2, CR2=C(R2)2, CN, C(=O)OR2, C(=O)N(R2)2, Si(R2)3, N(R2)2, NO2, P(=O)(R2)2, OSO2R2, OR2, S(=O)R2, S(=O)2R2, where two or more R1 are optionally bonded to form a ring;    R2 = linear 1-20C-alkyl, linear 1-20C-alkoxy, linear 1-20C-thioalkyl, branched or cyclic 3-20C-alkyl, branched or cyclic 3-20C-alkoxy, branched or cyclic 3-20C-thioalkyl, 2-20C-alkenyl, 2-20C-alkynyl (where one or more CH2 group are optionally replaced by R3C=CR3-, -CC-, Si(R3)2, C=O, C=S, C=NR3, -C(=O)O-, -C(=O)NR3-, NR3, P(=O)(R3), -O-, -S-, SO or SO2 and one or more H atoms are optionally replaced by D, F, Cl, Br, I, CN or NO2), 5-30 membered (hetero)aryl ring system, 5-30 membered (hetero)aryloxy (all optionally substituted by R3), H, D, F, Cl, Br, I, B (OR2)2, CHO, C(=O)R3, CR3=C(R3)2, CN, C(=O)OR3, C(=O)N(R3)2, Si(R3)3, N(R3)2, NO2, P(=O)(R3)2, OSO2R3, OR3, S(=O)R2, S(=O)2R3, where two or more R2 are optionally bonded to form a ring;    R3 = H, D, F, aliphatic, (hetero)aryl 1-20C-organic group (in which one or more H atoms are optionally replaced by D, or F), where two or more R3 are bonded to form a ring;    m, n = 0-3, where m is preferably 0 and n is 1 or 2.    Where: the group Ar1 or the nitrogen atom is bonded to fluorene ring system in 1-position, 3-position or 4-position; n in (II) is 1, if the X is a single bond; (I) is free of heteroaryl with greater than 14 aryl ring atoms. INDEPENDENT CLAIMS are included for:    (1) the preparation of (Q);    (2) an oligomer, a polymer or a dendrimer comprising (I), where the bonds to the oligomer, polymer or dendrimer is optionally localized in (Q) with R1; and    (3) a formulation comprising (I) and at least one solvent.