Optical information recording element

Abstract

This invention relate to an optical information recording medium, characterized by having an organic thin film recording layer containing at least one of compounds expressed by the general formula (I), (II), (III) and (IV): ##STR1## (wherein in the above formulas, A, B, D and E represent a substituted or non-substituted aryl group; R.sub.1 to R.sub.8 may be the same or different and represent hydrogen atom, halogen atom or alkyl group; Y represents a divalent residue having atomic groups necessary for forming a five-membered ring or six-membered ring; m, n and l represents 0, 1 or 2; ans X.sup.- represents an acid anion); ##STR2## (wherein in the above formulas, A' represents a heterocyclic ring selected from the group of thiazole, oxazole, pyrrole, 3,3-dialkyl indolenine, imidazole, pyridine and quinoline and said heterocyclic ring may be condensed with a benzen ring or naphthalene ring, the aromatic ring of which may have a substituent; D' and E' may be the same or different and represent a substituted or non-substituted aromatic ring or D' and E' may get together to form an aromatic ring or heterocyclic ring; X represents an anion; l represents 0, 1 or 2 and m and n represnt 0, 1, 2 or 3; R.sub.9 represents hydrogen, alkyl group, amino group or halogen atom; and Y represents atomic groups necessary for forming a substituted or non-substituted five-membered ring or six-membered ring).