TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Device: The device further comprises a hole injection layer between the first electrical contact layer and the active layer, where the hole injection layer comprises at least one electrically conductive polymer and at least one fluorinated acid polymer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No preparation method is given. Preferred Components: The compound is at least 10 (preferably at least 50, especially 100)% deuterated. Preferred Composition: The electroactive composition further comprises a second host material selected from chrysenes, phenanthrenes, triphenylenes, phenanthrolines, naphthalenes, anthracenes, quinolines, isoquinolines, quinoxalines, phenylpyridines, benzodifurans, and metal quinolinate complexes. The active layer is an electroactive layer which further comprises an organometallic dopant capable of electroluminescent having an emission maximum of 380-750 nm. The active layer consists essentially of the compound (I) and the organometallic dopant. The active layer is a hole transport layer. Preferred Definitions:    R7 and R8=phenyl;and    R7+R8=6-membered aliphatic ring.    SPECIFIC COMPOUNDS - 6 Compounds are specifically claimed as compound (I) e.g. N,N'-(4,4'-(diphenylmethylene)bis(4,1-phenylene))bis(6-methyl-N-(6-methylbiphenyl-3-yl)biphenyl-3-amine) (Ia); 4,4'-(cyclohexane-1,1-diyl)bis(N-phenyl-N-p-tolylaniline); 4,4'-(diphenylmethylene)bis(N,N-bis(3-(biphenylen-1-yl)phenyl)aniline); 4,4'-(1-phenylethane-1,1-diyl)bis(N,N-bis(3-(biphenylen-1-yl)phenyl)aniline); 4',4''-(diphenylmethylene)N,N-bis(3-(biphenylen-1-yl-4-methyl)phenyl)aniline).    EXAMPLE - In a dry box, 4,4'-(diphenylmethylene)dianiline (1.15 g), 3-bromo-3'-phenylbiphenyl (4.41 g), tris(tert-butyl)phosphine (0.066 g) and tris(dibenzylideneacetone)dipalladium(0) (0.15 g) were combined in round bottom flask and dissolved in dry toluene (30 ml). The solution was stirred for a minute and followed by sodium tert-butoxide (1.38 g) and dry toluene (5 ml). A heating mantle was added and the reaction was heated to 60 degrees C for 18 hour. After work-up 4,4'-(diphenylmethylene)bis(N,N-bis(3-(biphenylen-1-yl)phenyl)aniline) (2.33 g, Yield: 43%) was obtained.