TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The host and dopant are present in a concentration of (1 wt./vol.%) in the solvent. The composition (C1) comprises: the distyrylarylene compound (I) or mixtures of the distyrylarylene compound (I) and diarylantracene compound, and an arylamine compound, in a concentration of (1 wt./vol.%) in a solvent, where the weight:weight ratio of the distyrylarylene compound or mixtures of the distyrylarylene compound and diarylantracene compound, to the arylamine compound is 10:1 to 40:1. The weight ratio of the distyrylarylene compound:arylamine compound is 13:1 or 30:1 (preferably 13:1). Preferred Components: The solvent is organic and nonreactive with the host and dopant. The solvent is an aromatic hydrocarbon selected from toluene, xylene, mesitylene, anisole, and/or their derivatives; or chlorobenzene, cyclohexanone, gamma-valerolactone, chloroform, tetrachloroethane, tetrachloroethylene, trifluorotoluene, methylbenzoate, N,N-dimethylformamide, and/or their derivatives (preferably toluene, and/or trifluorotoluene; especially toluene and trifluorotoluene in a 1:1 volume:volume ratio). The solvent further includes esters, ketones, and alcohols. Preferred Method: The deposition of the composition (C1) is carried out by spin-coating. SPECIFIC COMPOUNDS - 23 Compounds are disclosed as the distyrylarylene compound (I) e.g. 9,10-bis-(4-(2,2-diphenyl-vinyl)-phenyl)-2,6-bis-(2-ethyl-hexyloxy)-anthracene of formula (Ia); (9,10-bis-(4-(2,2-diphenyl-vinyl)-phenyl)-anthracen-2-yl)-heptyl-dimethyl-silane; 7-(2,7-bis-(4-(2,2-diphenyl-vinyl)-phenyl)-9-heptyl-9H-fluoren-9-yl)-2,2-dimethyl-heptanenitrile; 2,7-bis-(4-(2,2-diphenyl-vinyl)-3-heptyl-phenyl)-9,9-dimethyl-9H-fluorene; and 9-(6-(2,2-diphenyl-vinyl)-8-hexyl-naphthalen-2-yl)-10-(6-(2,2-diphenyl-vinyl)-8-pentyl-naphthalen-2-yl)-anthracene.    EXAMPLE - A high performance fluorescent green organic light-emitting diode (OLED) device was manufactured as follows. A patterned indium-tin oxide (ITO) substrate (device active area=0.25x 0.25 cm2) was cleaned. After cooling, an aqueous dispersion of hole injection material comprising Nafion (RTM: poly(3,4-ethylenedioxythiophene) (PEDOT)/colloid forming fluorinated polymeric acid), was spin-coated over the ITO surface to form a buffer layer at a thickness of approximately 20 nm. The cathode leads were wiped clean with damp swabs and the substrate was then baked at 130 degrees C for 10 minutes in air. The dried substrate was transferred to nitrogen filled drybox, in which all further manipulations were conducted. After cooling, HT-12 (crosslinkable poly(triarylamine) dissolved in toluene to 0.4 wt./vol.%, was spin coated onto the substrate to a thickness of 20 nm. It was then baked at 200 degrees C for 30 minutes at atmospheric pressure to form the hole transport layer. After cooling, the substrate was spin-coated with a solvent mixture of 1:1 toluene and trifluorotoluene containing 1 wt/vol.% of a 30:1 wt./vol.% host:dopant mixture of 9,10-bis-(4-(2,2-diphenyl-vinyl)-phenyl)-2,6-bis-(2-ethyl-hexyloxy)-anthracene (Ia) (host), and 2-tert-butyl-Nasterisk9asterisk,Nasterisk9asterisk,Nasterisk10asterisk,Nasterisk10asterisk-tetra-para-tolyl-anthracene-9,10-diamine (dopant). After spin coating onto the hole transport layer film to a thickness of 40 nm, the layer was baked at 120 degrees C in vacuum (less than 10-2 torr) for 30 minutes, to form an emissive layer. The cathode contacts were wiped clean, and the substrate was baked at 90 degrees C for 30 minutes at atmospheric pressure. After this time, the substrate was masked and placed in a vacuum chamber. After pumping to base pressure of 2x 10-7 torr, a layer of tris(8-quinolinolato)aluminum (Alq3) was deposited by thermal evaporation, to a thickness of 20 nm, to form an electron transport layer. This was followed by a layer of lithium fluoride (1 nm), which defined the active area. The cathode mask was then changed, and an overcoat of Al (100 nm) was vapor deposited, to form the cathode. The chamber was finally vented to argon, and the device was encapsulated using a glass lid and UV curable epoxy. The device was then measured for initial current, voltage, luminance, and color coordinate properties; and then luminance degradation behavior was examined by subjecting the device to constant current for a prolonged time period while monitoring luminance and voltage change. The results of the device performance data were as follows: initial efficiency (cd/A) (at 10 mA/cm2) = 18.5; voltage (at 10 mA/cm2) = 6.1; luminance (cd/m2) (at 10 mA/cm2) = 1850; color coordinates (CIE x,y) = (0.32, 0.62); and luminance, half life (hours) at initial luminance (cd/m2) = 600 at 4840.