TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No preparation method is given. Preferred Components: The active layer is hole transport layer or photoactive layer comprising photoactive material and substituted aryl amine. Preferred Definitions:    T1-T2=one or more 9 aromatic compounds e.g. group of formula (IV);    Ar2=Ph, p-biphenyl, p-terphenyl, naphthyl, phenylnaphthyl, or naphthylphenyl of formula (V);    Ar2=substituent comprising crosslinking group consisting of alkyl, alkoxy and silyl;    M=triarylamine units and aromatic unit having crosslinkable substituent;    Ar1=substituted phenyl with a substituent consisting of alkyl, alkoxy, silyl, or a substitutent with crosslinking group;    R=1-10C alkyl, aryl, 1-10C alkoxy, aryloxy, fluoroalkyl, fluoroaryl, fluoroaryloxy, fluoroalkyloxy, oxyalkyl or alkenyl;or    R+R=non-aromatic ring;    R1=alkyl, alkoxy, and silyl;    f=0-4;    g=0-5; and    m=1-5.    SPECIFIC COMPOUNDS - 29 Electroactive compounds are specifically claimed e.g. group of formulae (VI), (VII) and (VIII).    EXAMPLE - Monomer (1.35 g) of formula (IX) was added to scintillation vial and dissolved in toluene (13 ml). A clean, dry 50 ml Schlenk tube was charged with bis(1,5-cyclooctadiene)nickel(0) (0.597 g). 2,2'-Dipyridyl (0.339 g) and 1,5-cyclooctadiene (0.235 g) were weighed into scintillation vial and dissolved in 2 ml N,N'-dimethylformamide. The solution was added to Schlenk tube. The Schlenk tube was inserted into an aluminum block and the block was heated and stirred on a hotplate/stirrer at setpoint that resulted in an internal temperature of 60?oC. The catalyst system was held at 60?oC for 30 minutes and then raised to 70?oC. The monomer solution in toluene was added to Schlenk tube and the tube was sealed. The polymerization mixture was stirred at 70?oC for 18 hours. The tube was removed from the glovebox and the contents were poured into a solution of concentrated hydrochloric acid/methanol. After stirring for 2 hours, electroactive compound (VIII) was collected by vacuum filtration and dried under high vacuum. The electroactive compound was purified by successive precipitations. A white, fibrous electroactive compound (1.1 g) was obtained having a molecular weight of 427866. An organic LED device was fabricated from indium tin oxide layer as anode (50 nm); buffer layer (25 nm); compound (VIII) as hole transport layer (20 nm), 13:1 host H1:dopant E1 as photoactive layer (47 nm), electron zirconia as transport layer (20 nm) and cesium fluoride/aluminum as cathode (0.7/100 nm). The device exhibits deep blue emission.