NOVELTY - Carbazole derivative (I) or (II) excluding 43 compounds e.g. 9,9,9',9'-tetramethyl-10,10'-bis-(9-phenyl-9H-carbazol-3-yl)-9,10,9',10'-tetrahydro-(2,2')biacridinyl, 9,9,9',9'-tetramethyl-10-phenyl-10'-(9-phenyl-9H-carbazol-3-yl)-9,10,9',10'-tetrahydro-(2,2')biacridinyl, (4-(9,9-dimethyl-10-(9-phenyl-9H-carbazol-3-yl)-9,10-dihydro-acridin-2-yl)-phenyl)-diphenyl-amine, 9-(9,9-dimethyl-9H-acridin-10-yl)-12,12-dimethyl-6-p-tolyl-6,12-dihydro-6-aza-indeno(1,2-b)fluorene and 12,12-dimethyl-9-phenoxazin-10-yl-6-p-tolyl-6,12-dihydro-6-aza-indeno(1,2-b)fluorene, is new.    USE - (I) or (II) or a polymer, oligomer or a dendrimer is useful in electronic devices, preferably organic electroluminescent devices (organic light-emitting diodes), 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 as: hole transport material, matrix material, emitter material, electron-blocking material, hole injection material, hole blocking material and/or as electron transport material; as matrix material in combination with at least one further matrix material in emitting layer; and as hole transport material in hole transport layer or hole injection layer and/or as matrix material in emitting layer (all claimed).    ADVANTAGE - (I) or (II): exhibits good hole mobility and thus reduces the dependence of the operating voltage on the thickness of the hole transport layer and high oxidation and thermal stability and thus improves the processability and the service life of the electronic devices; and reduces the operating voltage and thus extends the service life of the electronic devices.    DETAILED DESCRIPTION - Carbazole derivative of formula (I) or (II) excluding 43 compounds e.g. 9,9,9',9'-tetramethyl-10,10'-bis-(9-phenyl-9H-carbazol-3-yl)-9,10,9',10'-tetrahydro-(2,2')biacridinyl, 9,9,9',9'-tetramethyl-10-phenyl-10'-(9-phenyl-9H-carbazol-3-yl)-9,10,9',10'-tetrahydro-(2,2')biacridinyl, (4-(9,9-dimethyl-10-(9-phenyl-9H-carbazol-3-yl)-9,10-dihydro-acridin-2-yl)-phenyl)-diphenyl-amine, 9-(9,9-dimethyl-9H-acridin-10-yl)-12,12-dimethyl-6-p-tolyl-6,12-dihydro-6-aza-indeno(1,2-b)fluorene and 12,12-dimethyl-9-phenoxazin-10-yl-6-p-tolyl-6,12-dihydro-6-aza-indeno(1,2-b)fluorene, is new.    W1 = Z, where optionally a unit comprising two adjacent W1 may be replaced by cyclic moiety of formula (III), which is arranged such that the bond between C to six-membered ring of carbazole derivative is fused, and in six-membered ring of carbazole derivative, maximum of one unit comprising two adjacent W1 may be replaced by (III);    a = bond between C to six-membered ring of carbazole derivative;    X = C(R)2, Si(R)2, NR, PR, P(=O)R, BR, O, S, C=O, C=S, C=NR, S=O or S(=O)2;    Z = C (when Z is bonded to substituent), CR or N;    L = C(R)2, Si(R)2, NR, PR, P(=O)R, BR, O, S, C=O, C=S, C=NR, C=C(R)2, S=O, S(=O)2 or CR=CR; either    R = 3-40C alkoxy or 3-40C (thio)alkyl (both optionally cyclic), straight chain 1-40C alkoxy or 1-40C (thio)alkyl, 2-40C alkenyl or 2-40C alkynyl (all optionally substituted by at least one R1, where at least one non-adjacent CH2 may be replaced by -R1C=CR1-, -CC-, Si(R1)2, Ge(R1)2, Sn(R1)2, C=O, C=S, C=Se, C=NR1, P(=O)(R1), SO, SO2, NR1, -O-, -S-, -COO- or -CONR1- and at least one H may be replaced by D, F, Cl, Br, I, ON, or NO2), mono- or polycyclic (hetero)aromatic ring with 5-60 aromatic ring atoms, (hetero)aryloxy with 5-60 aromatic ring atoms (both optionally substituted by at least one non-aromatic R1), H, D, F, Cl, Br, I, CHO, N(R1)2, C(=O)R1, P(=O)(R1)2, S(=O)R1, S(=O)2R1, CR1=C(R1)2, CN, NO2, Si(R1)3, B(OR1)2, OSO2R1, OH, COOR1 and/or CON(R1)2; or    at least 2R = mono- or polycyclic, aliphatic or aromatic ring; either    R1 = 3-40C alkoxy or 3-40C (thio)alkyl (both optionally cyclic), straight chain 1-40C alkoxy or 1-40C (thio)alkyl, 2-40C alkenyl or 2-40C alkynyl (all optionally substituted by at least one R2, where at least one non-adjacent CH2 may be replaced by -R2C=CR2-, -CC-, Si(R2)2, Ge(R2)2, Sn(R2)2, C=O, C=S, C=Se, C=NR2, P(=O)(R2), SO, SO2, NR2, -O-, -S-, -COO- or -CONR2- and at least one H may be replaced by D, F, Cl, Br, I, CN or NO2), mono- or polycyclic (hetero)aromatic ring with 5-60 aromatic ring atoms, (hetero)aryloxy with 5-60 aromatic ring atoms (both optionally substituted by at least one non-aromatic R2), H, D, F, Cl, Br, I, CHO, N(R2)2, C(=O)R2, P(=O)(R2)2, S(=O)R2, S(=O)2R2, CR2=C(R2)2, CN, NO2, Si(R2)3, B(OR2)2, OSO2R2, OH, COOR2 or CON(R2)2; or    at least 2R1 = mono- or polycyclic, aliphatic or aromatic ring; either    R2 = 1-20C aliphatic- and/or 1-20C (hetero)aromatic organic residue (where at least one H may be replaced by D or F) H, D or F; or    at least 2R2 = mono- or polycyclic, aliphatic or aromatic ring;    i = 0-2, where if i = 0, then two groups that are bonded to the group indexed by i, are connected directly with each other;    j = 0-2, where if j = 0, then two groups that are bonded to the group indexed by j, are connected directly with each other;    k = 0 or 1, where if k = 0, then N and (hetero)aromatic ring that are bonded to the group indexed by k, are connected directly with each other; and    n = 0 or 1, where sum of n = 1-3.    Provided that maximum of one substituent R represents carbazole or R does not represent carbazole. INDEPENDENT CLAIMS are also included for:    (1) an oligomer, polymer or dendrimer comprising at least one compound (I) or (II), where the bond to the polymer, oligomer or dendrimer in (I) or (II) may be localized with a residue R substituted position;    (2) a formulation comprising at least one compound (I) or (II) or at least one polymer, oligomer or dendrimer and at least one solvent; and    (3) preparing (I).