The present invention provides a new carbazole based compound represented by the following formula (1): ##STR1##

wherein R is a substituent selected among a hydrogen atom, an alkyl group, an alkyl ether group, a sulfoamino group, a carbon cyclic group, a heterocyclic group and an aromatic cyclic group, "n" is integer, where at least one substituent other than the hydrogen atom are introduced and the each substituent may be the same or different.