TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I) or (II), comprises reacting 1,12-dilithio-triphenylene with electrophiles or reacting halogen- or amino substituted triphenylene derivative in a metal catalyzed coupling reaction. Preferred Components: (I) or (II) comprises substituted triphenylene derivative of formula (IIIa)-(IIIh). Preferred Definitions:    R1, R = phenyl, ortho-, meta- or para biphenyl, ortho-, meta- or para terphenyl, ortho-, meta-, para branched quaterphenyl, fluorene or spirobifluorene (all optionally substituted by at least one group R3), or 31 moieties e.g. substituted (1,3,5)triazine moiety of formula (IVa), substituted pyrimidine moiety of formula (IVb), (IVc), (IVd), substituted 9H-carbazole moiety of formula (IVe), (IVf), (IVg) and substituted dibenzofuran moiety of formula (IVh), (IVi) and (IVj) (when (I) is used as matrix material for phosphorescent emitters) or electron-deficient heteroaromatic ring comprising triazine, pyrimidine, pyrazine, pyridazine, pyridine, imidazole, pyrazole, oxazole, oxadiazole, triazole, thiazole, thiadiazole, benzimidazole, quinoline, isoquinoline or quinoxaline, preferably (IVa), (IVb), (IVc), (IVd), substituted 1H-benzoimidazole moiety of formula (Va), (Vc), substituted 2-phenyl-1H-benzoimidazole moiety of formula (Vb) or substituted 1-phenyl-1H-benzoimidazole moiety of formula (Vd) (when (I) is used as an electron transport material).    SPECIFIC COMPOUNDS - 92 Compounds (I) are disclosed e.g. 4-phenyl-4H-4-bora-cyclopenta(def)triphenylene of formula (Ia), 4-(2,6-dimethyl-phenyl)-4H-4-bora-cyclopenta(def)triphenylene, 4-(1,1';3',1'')terphenyl-2'-yl-4H-4-bora-cyclopenta(def)triphenylene, 2,6-diphenyl-4-(2,4,6-trimethyl-phenyl)-4H-4-bora-cyclopenta(def)triphenylene and 9,10-diphenyl-4-(2,4,6-trimethyl-phenyl)-4H-4-bora-cyclopenta(def)triphenylene.    EXAMPLE - N,N-Tetramethylethylenediamine (48.8 g) was added to a suspension of triphenyleno(1,12-bcd)thiophene (25.8 g) in n-hexane (2000 ml), and then n-butyllithium (in 1.6 M n-hexane) (250 ml) was added to it dropwise. Then the mixture was stirred for 4 hours at 60 degrees C. After cooling the reaction mixture to -60 degrees C, boric acid trimethyl ester (46.8 g) was added to it under vigorous stirring. Then the reaction mixture was stirred for 30 minutes at -60 degrees C and then worked up to obtain triphenyleno(1,12-bcd)thiophene-7,9-diyldiboronic acid. Then tri-o-tolylphosphine (913 mg) was added to a mixture of triphenyleno(1,12-bcd)thiophene-7,9-diyldiboronic acid (17.3 g), 2-bromo-9-phenyl-carbazole (41.9 g) and tripotassium phosphate (31.8 g) in a mixture of toluene (200 ml), ethanol (100 ml) and water (300 ml) under stirring. Then palladium(II) acetate (112 mg) was added to the mixture and heated for 16 hours under reflux. After cooling the reaction mixture was worked up to obtain 7,9-bis(9-phenyl-9H-carbazol-2-yl)triphenyleno(1,12-bcd)thiophene.