A photoreceptor having at least a light-sensitive layer, which photoreceptor contains a compound represented by the following general formula (1): ##STR1## where Ar.sup.1, Ar.sup.2 and Ar.sup.3 each represents a substituted or unsubstituted alkyl group,a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group, provided that Ar.sup.1 and Ar.sup.2 may form a ring together with the nitrogen atom to which they are bound; R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represents a hydrogen atom, a halogen atom, an alkoxy group, or a substituted or unsubstituted alkyl group.