TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The electronic device is organic electroluminescent device containing anode, cathode, emitting layer and optionally further organic layers, where (A) or at least one oligomer, polymer or dendrimer is present as a matrix compound in combination with at least one emitter compounds in the emitting layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (A), comprises either (i) performing coupling reaction of benzanthracene derivative and an aromatic or heteroaromatic ring system to obtain benzanthracene compound, which is substituted with aromatic or heteroaromatic ring system, (ii) performing halogenation, preferably bromination of the benzanthracene compound and (iii) introducing a substituent in the halogenated compoud, preferably brominated compoud, or (i) preparing a substituted benzanthracene derivative made from naphthyl derivative and a phthalic anhydride and (ii) performing coupling reaction of the substituted benzanthracene derivative with an aromatic or heteroaromatic ring system. Preferred Definitions:    Ar1 = naphthalene, anthracene, benzanthracene, phenanthrene, benzophenanthrene, pyrene, chrysene, perylene, fluoranthene, naphthacene, pentacene, benzopyrene, biphenyl, terphenyl, quaterphenyl, fluorene, spirobifluorene, furan, benzofuran, isobenzofuran, dibenzofuran, thiophene, benzothiophene, isobenzothiophene, dibenzothiophene, indole, isoindole, carbazole, indolocarbazole, indenocarbazole, pyridine, quinoline, isoquinoline, acridine, phenanthridine, benzimidazole, pyrimidine, pyrazine or triazine;    L1 = benzene, naphthalene, anthracene, benzoanthracene, phenanthrene, benzophenanthrene, pyrene, chrysene, perylene, fluoranthene, naphthacene, pentacene, benzopyrene, biphenyl, terphenyl, quaterphenyl, fluorene, spirobifluorene, furan, benzofuran, isobenzofuran, dibenzofuran, thiophene, benzothiophene, isobenzothiophene, dibenzothiophene, indole, isoindole, carbazole, indolocarbazole, indenocarbazol, pyridine, quinoline, isoquinoline, acridine, phenanthridine, benzimidazole, pyrimidine, pyrazine or triazine; and    n = 2.    SPECIFIC COMPOUNDS - 54 Compounds (A) are disclosed, e.g. 7-methyl-4-(10-phenyl-anthracen-9-yl)-benzo(a)anthracene of formula (Ia), 7-isobutyl-4-(10-phenyl-anthracen-9-yl)-benzo(a)anthracene, trimethyl-(4-(10-naphthalen-1-yl-anthracen-9-yl)-benzo(a)anthracen-7-yl)-silane, 7,12-dimethyl-4-(10-phenyl-anthracen-9-yl)-benzo(a)anthracene and 7-isobutyl-5-(10-phenyl-anthracen-9-yl)-benzo(a)anthracene.    EXAMPLE - 5.47 g Methyl boronic acid, 25 g 7-bromo-4-(10-phenyl-anthracene-9-yl) -benzo (a)anthracene and 20.4 g potassium phosphate-mono hydrate were suspended in 500 ml toluene, 1.09 g dicyclohexyl(2',6'-dimethoxy-2-biphenylyl)phosphine and 0.3 g palladium acetate were added to the suspension, and heated and refluxed for 16 hours to obtain a reaction mixture. The reaction was cooled and diluted with water, the organic phase was separated, washed three times with 100 ml water, concentrated to dryness, and filtered to obtain a crude product. Then the crude product was passed over silica gel with toluene and resultant residue was recrystallized from toluene/ heptane to obtain 17.3 g 7-methyl-4-(10-phenyl-anthracen-9-yl)-benzo(a)anthracene with 79% yield.