NOVELTY - (Hetero)cyclic compounds (Q) are new.    USE - (Q) are useful: for producing oligomer, polymer or dendrimer; in an electronic device including organic integrated circuits, organic FETs, organic thin-film transistors, organic light-emitting transistors, organic solar cells, organic optical detectors, organic photoreceptors, organic field-quench devices, organic light-emitting electrochemical cells, organic laser diodes or organic electroluminescent devices; and as a matrix material in an emitting layer in combination with one or several dopants or as an electron-transporting material in an electron transport layer, an electron injection layer or a hole blocking layer (all claimed).    ADVANTAGE - (I) improve lifetime, stability and power efficiency of the electronic device.    DETAILED DESCRIPTION - (Hetero)cyclic compounds (Q) of formula (RA-Cbz) (I), (II) or ((I)-T-(I)) (III) are new.    Cbz = carbazole (optionally substituted with one or more radicals R1), which extends with one or more fused indeno groups to indeno carbazole groups, and in which one or more aryl groups of =C(R1)- or =C(H)- are replaced by =N- and are bound via the carbazole nitrogen atom to the group RA;    Z = identical or different CR1 or N;    R1 = C(=O)R2, CN, Si(R2)3, N(R2)2, P(=O)(R2)2, S(=O)R2, S(=O)2R2, linear-chain 1-20C-alkyl or -alkoxy, branched or cyclic 3-20C-alkyl or -alkoxy, 2-20C-alkenyl or -alkynyl (all optionally substituted by R2), H, D, F, aryl or heteroaryl ring system having 5-30C aromatic ring atoms that are substituted by one or more radicals R2, or aryloxy- or heteroaryloxy having 5-30C aromatic ring atoms (substituted by R3), where one or more CH2 groups are replaced by R2C=CR2-, -CC-, Si(R2)2, C=O, C=NR2, -C(=O)O-, -C(=O)NR2-, NR2, P(=O)(R2), -O-, -S-, SO or SO2, and one or more H atoms are replaced by D, F or CN;    RA = monovalent group of formula (A), or R1, where at least one RA corresponds to per unit of (I) or (II);    dotted line = bond;    L1 = aryl or heteroaryl ring system having 6-30, preferably 6-24 aryl ring atoms, which are substituted with one or more radicals R1;    E1 = O, S (both preferred) or NAr1;    X = N or CRX, where at least one group X per six-membered ring is equal to N, preferably two or three X groups per six-membered ring are equal to N;    i = 0 or 1, where at least one index i for each group of the formula (A) is equal to 1, and the other of the index i is equal to 0;    Rx = C(=O)R2, CN, Si(R2)3, S(=O)R2, S(=O)2R2, linear-chain 1-20C-alkyl, branched or cyclic 3-20C alkyl, 2-20C-alkenyl or -alkynyl (all optionally substituted by R2), H, D, F, or aryl or heteroaryl ring system having 5-30C aromatic ring atoms that are substituted by one or more radicals R2, where one or more CH2 groups are replaced by R2C=CR2-, -CC-, Si(R2)2, C=O, C=NR2, -C(=O)O-, -C(=O)NR2-, NR2, P(=O)(R2), -O-, -S-, SO or SO2; either    R2 = C(=O)R3, CN, Si(R3)3, N(R3)2, P(=O)(R3)2, S(=O)R3, S(=O)2R3, linear 1-20C-alkyl or -alkoxy, branched or cyclic 3-20C-alkyl or -alkoxy, or 2-20C-alkenyl or -alkynyl (all optionally substituted by R3), H, D, F, aryl or heteroaryl ring system having 5-30C aromatic ring atoms that are substituted by one or more radicals R3, or aryloxy- or heteroaryloxy having 5-30C aromatic ring atoms (substituted by R3), where one or more CH2 groups are replaced by R3C=CR3-, -CC-, Si(R3)2, C=O, C=NR3, -C(=O)O-, -C(=O)NR3-, NR3, P(=O)(R3), -O-, -S-, SO or SO2; or    two or more radicals R2 = ring; either    R3 = aliphatic, aryl or heteroaryl organic radical having 1-20C (in which one or more H-atoms are replaced by D or F), H, D or F; or    two or more radicals R3 = ring;    Ar1 = aryl ring system having 6-30, preferably 6-18 aromatic ring atoms, which are substituted with one or more radicals R1; and    T = single bond or aryl or heteroaryl ring system having 6-30 aromatic ring atoms, which are substituted with one or more radicals R1, where T is bonded to any position of (III).    INDEPENDENT CLAIMS are included for:    (1) the preparation of (Q);    (2) oligomer, polymer or dendrimer comprising (Q), where the bond(s) for the polymer, oligomer or dendrimer is located in (I), (II) or (III) with R1 or Rx substituted positions;    (3) a formulation comprising (Q), polymer, polymer or dendrimer and at least one solvent; and    (4) an electronic device comprising (Q).