TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: In (A), (I) is used as a mixture with at least a host material. (A) further comprise further layers (hole injection layer, hole transport layer, electron transport layer and/or electron injection layer). The several emitting compounds are used in the same or different layers, where these compounds have the structure of (I).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: (I) are prepared by bromination, Suzuki-coupling or Wittig-Horner-reaction.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The host material is oligoarylene containing condensed aromatic group, oligoarylene vinylene, polypodalen metal complex, hole conducting compounds, the electron conducting compounds, ketone, phosphene oxide, sulfoxide or atropisomer. The amount of (I) in the mixture is 0.1-99 wt.% and the amount of the host material is 1-99 wt.%. Preferred Definitions:    Y = N, P or P=O;    Ar1-Ar9 = (hetero)aryl;    R = H, CN, linear, branched or cyclic 1-4C alkyl (where one or more non adjoining CH2 is replaced with -R2C=CR2, -C?=C-, -O- or -S-, and where one or more H is replaced with F) or 2-16C monovalent aryl or heteroaryl (substituted with one or more R1);    R1 = H, F, CN, linear, branched or cyclic 1-10C-alkyl- or alkoxy (both substituted with one or more R2, where one or more non adjoining CH2 is replaced with -R2C=CR2, -C?=C-, -O- or -S-, and where one or more H is replaced with F), 2-16C monovalent aryl or heteroaryl (substituted with one or more R2), aryloxy or heteroaryloxy with 2-16C aromatic C (substituted with one or more R2) or a combination of 2-4 of these systems (where two or more substitutents R1 both at the same ring as well as at different rings together forms a mono- or polycyclic, aliphatic or aromatic ring system); and    n = 1-3.    (I) are symmetrically formed and exhibits triple axis of rotation (C3).    SPECIFIC COMPOUNDS - 42 Compounds (I) are specifically claimed e.g. tris-1((1'-styryl)-4-4'-biphenyl)amine of formula (Ia).    EXAMPLE - Degassed suspension of tris(4-bromphenyl)amine (48.2 g), 4-formylbenzolboronic acid (67.4 g) and potassium phosphate hydrate (156.4 g) in a mixture of dioxane (130 ml), toluol (300 ml) and water (375 ml) was stirred with tri-o-tolylphosphene (5.5 g) and then with (674 mg) palladium(II)acetate. After 5 hours of cooking, the mixture was cooled and then worked up to give tris-1-(1'-formyl-4,4'-biphenyl)amine (51.9 g). A mixture of phenyl methane phosphonic acid diethyl ester (50 ml) and dimethyl formamide (DMF) (1000 ml) was stirred at 0degreesC with sodium-tert-butylate (46.1 g). To this mixture, a 30degreesC warm solution of tris-1-(1'-formyl-4,4'-biphenyl)amine (37 g) in DMF was added at 0-10degreesC followed by further stirring at 0-10degreesC for 3 hours. Subsequently 2.5 N hydrochloric acid (100 ml), water 300 (ml) and ethanol (300 ml) were added. The mixture was further worked up to give tris-1((1'-styryl)-4-4'-biphenyl)amine.