Compounds of formula [I] ##STR1##

wherein each R¹ to R⁸ is independently selected from the group consisting of halogen atoms, cyano, isocyano, mercapto, amino, carbonyl, carboxy, sulfone, nitro and hydroxy groups, and optionally substituted alkyl, alkenyl, alkynyl, haloalkyl, hydroxyalkyl, aryl, alkoxy, aryloxy, alkylamino, arylamino, alkylarylamino, amide, alkylthio, arylthio, alkoxy carbonyl, siloxy, cyclic hydrocarbon or heterocyclic groups; each x is independently zero, one, two or three; each y is independently zero or one; and each z is independently zero, one, two or three are useful in organic electroluminescence devices. Such compounds are disclosed herein, as well as organic electroluminescence devices using the compounds in the emissive layer.