The invention provides low molecular weight or polymeric organic materials in which at least one hydrogen atom is replaced by a group of the formula (A) ##STR00001## where R is alkyl group, alkoxyalkyl group, alkoxy group, thioalkoxy group, aryl group or alkenyl group, in each of which one or more hydrogen atoms may be replaced and one or more nonadjacent carbon atoms may be replaced. Z is --O--, --S--, --CO--, --COO--, --O--CO-- or a bivalent group --(CR.sub.1R.sub.2).sub.n-- in which R.sub.1 and R.sub.2 are hydrogen, alkyl, alkoxy, alkoxyalkyl or thioalkoxy group, aryl or alkenyl, in each of which one or more hydrogen atoms may be replaced and one or more nonadjacent carbon atoms may be replaced, and n is an integer from 1 to 20. X is a bivalent group --(CR.sub.1R.sub.2).sub.n-- and, with the proviso that the number of these A groups is limited by the maximum number of available substitutable hydrogen atoms. The invention also relates to their use for producing optionally multilayered structured light emitting diodes, lasers, solar cells, waveguides or integrated circuits.