NOVELTY - Substituted triphenylene derivative (I) or (II) excluding 1-(3-bromomethyl-5-methyl-phenyl)-12-(3,5-dimethyl-phenyl)-triphenylene, 1-(3-bromomethyl-5-methyl-phenyl)-1,2-phenyl-triphenylene, 1-phenyl-12-(2,4,6-trimethyl-phenyl)-triphenylene, 1-phenyl-12-p-tolyl-triphenylene, 1-(3,5-dimethyl-phenyl)-12-phenyl-triphenylene, 1,12-bis-(3,5-dimethyl-phenyl)-triphenylene, 1,12-diphenyl-triphenylene and 2-iodo-1,12-diphenyl-triphenylene, is new.    USE - (I) or (II) or the oligomer, polymer or dendrimer is useful as matrix material for fluorescent or phosphorescent emitters, in a hole blocking layer, in an electron transport layer, in an electron blocking or exciton blocking layer, in a hole-transport or hole injection layer and/or in an optical decoupling layer of electronic devices, preferably organic electroluminescent devices (organic light emitting diodes) (preferred), 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, organic laser diodes and organic plasmon emitting devices (all claimed).    ADVANTAGE - (I) or (II) is producible in few reaction steps and in high yields. The device comprising (I) or (II) exhibits very high efficiencies, long service life, steep current-voltage curves with low threshold voltages.    DETAILED DESCRIPTION - Substituted triphenylene derivative of formula (I) or (II) excluding 1-(3-bromomethyl-5-methyl-phenyl)-12-(3,5-dimethyl-phenyl)-triphenylene, 1-(3-bromomethyl-5-methyl-phenyl)-1,2-phenyl-triphenylene, 1-phenyl-12-(2,4,6-trimethyl-phenyl)-triphenylene, 1-phenyl-12-p-tolyl-triphenylene, 1-(3,5-dimethyl-phenyl)-12-phenyl-triphenylene, 1,12-bis-(3,5-dimethyl-phenyl)-triphenylene, 1,12-diphenyl-triphenylene and 2-iodo-1,12-diphenyl-triphenylene, is new.    X = substituted triphenylene moiety of formula (IIa) (when n = 0), BR2, C(R2)2, C=O, Si(R2)2, Ge(R2)2, Sn(R2)2, NR2, O, S, SO, SO2, PR2 or P(=O)R2;    A = C, Si, Ge or Sn;    Y1 = BR2, O, S, NR2, PR2 or P(=O)R2;    Z = CR1 or N, where not greater than 2 groups of Z per ring represents N;    R = (hetero)aromatic ring with 5-60 aromatic ring atoms (optionally substituted by at least one group R1), N(Ar1)2, C(=O)Ar1 or P(=O)(Ar1)2;    Ar1 = (hetero)aromatic ring with 5-60 aromatic ring atoms (optionally substituted by at least one non-aromatic group R3), where 2Ar1 that are bonded to same N or P, are bridged together by single bond, N(R4), C(R4)2, O or S; either    R1 = 1-40C alkoxy, 1-40C (thio)alkyl (both linear), 3-40C alkoxy, 3-40C (thio)alkyl (both branched or cyclic), 2-40C alkenyl, 2-40C alkynyl (where in all groups at least one non-adjacent CH2 group may be replaced by R3C=CR3, CC, Si(R3)2, Ge(R3)2, Sn(R3)2, C=O, C=S, C=Se, C=NR3, P(=O)(R3), SO, SO2, NR3, O, S or CONR3, and at least one H may be replaced by D, F, Cl, Br, I, CN or NO2), (hetero)aromatic ring with 5-60 aromatic ring atoms, (hetero)aryloxy with 5-60 aromatic ring atoms (all optionally substituted by at least one group R3), H, D, F, Cl, Br, I, CN, NO2, N(Ar1)2, N(R3)2, C(=O)Ar1, C(=O)R3 and/or P(=O)(Ar1)2; or    optionally at least 2R1 that are bonded to same benzene ring = monocyclic or polycyclic, aliphatic or (hetero)aromatic ring; either    R2 = 1-20C alkyl (linear), 3-20C alkyl (branched or cyclic and all optionally substituted by at least one group R3, where in all groups at least one non-adjacent CH2 group may be replaced by R3C=CR3, CC, Si(R3)2, C=O, C=NR3, P(=O)(R3), SO, SO2, NR3, O, S or CONR3, and at least one H may be replaced by D, F, Cl, Br, I, CN or NO2) or (hetero)aromatic ring with 5-60 aromatic ring atoms (optionally substituted by at least one group R3); or    optionally 2R2 that are bonded to same C, Si, Ge or Sn = monocyclic or polycyclic, aliphatic or (hetero)aromatic ring (all optionally substituted by at least one group R3); either    R3 = 1-40C alkoxy, 1-40C (thio)alkyl (both linear), 3-40C alkoxy, 3-40C (thio)alkyl (both branched or cyclic), 2-40C alkenyl, 2-40C alkynyl (where in all groups at least one non-adjacent CH2 group may be replaced by R4C=CR4, CC, Si(R4)2, C=O, C=NR4, P(=O)(R4), SO, SO2, NR4, O, S or CONR4, and at least one H may be replaced by D, F, Cl, Br, I, CN or NO2), (hetero)aromatic ring with 5-60 aromatic ring atoms (optionally substituted by at least one group R4), (hetero)aryloxy with 5-60 aromatic ring atoms (optionally substituted by at least one group R4), H, D, F, Cl, Br, I, CN, NO2, N(R4)2, C(=O)Ar1, C(=O)R4 and/or P(=O)(Ar1)2; or    optionally at least 2R3 = monocyclic or polycyclic, aliphatic or (hetero)aromatic ring (all optionally substituted by at least one group R4); either    R4 = (hetero)aromatic ring with 5-30 aromatic ring atoms (where at least one H may be replaced by D, F, Cl, Br, I, CN or 1-5C alkyl), H, D, F, CN or 1-20C aliphatic hydrocarbon; or    at least 2R4 = mono- or polycyclic, aliphatic or (hetero)aromatic ring; and    n = 0 or 1.    Provided that when X is C=O, O, S, SO or SO2 and n is 0, then at least one group R1 in (I) is (hetero)aromatic ring. INDEPENDENT CLAIMS are also included for:    (1) preparing (I) or (II);    (2) an oligomer, polymer or dendrimer, comprising (I) or (II), where at least one bond of (I) or (II) to the polymer, oligomer or dendrimer is present; and    (3) a formulation comprising (I) or (II) or at least one polymer, oligomer or dendrimer, and at least one solvent.