Optical information recording medium

An optical information recording medium comprising a substrate and a recording layer on said substrate, said recording layer comprising at least one compound having the formula (I) or (II):

• ##STR7## wherein X.sub.1, X.sub.2 and X.sub.3 represent O, S or Se;
• A.sup.- represents an anion;
• l, m and n represent 0 or 1;
• R.sub.4 represents a substituted or non-substituted aryl group or heterocyclic group;
• R.sub.3 and R.sub.9 represent hydrogen, alkyl, chloro or bromo, R.sub.5, R.sub.6, R.sub.10 and R.sub.11 represent hydrogen or an alkyl group;
• R.sub.1, R.sub.2, R.sub.7, R.sub.8, R.sub.12 and R.sub.13 represent hydrogen or a substituted or non-substituted alkyl, aryl or styryl group;
• Z.sub.1, Z.sub.3 and Z.sub.5 represent atomic groups necessary for forming a substituted or non-substituted pyrylium, thiapyrylium, selenapyrylium, benzopyrylium, benzothiapyrylium, benzoselenapyrylium, naphthopyrylium, naphthothiapyrylium or naphthoselenapyrylium;
• Z.sub.2 and Z.sub.4 represent atomic groups necessary for forming a substituted or non-substituted five-membered carbocylic ring or six-membered carbocylic ring;
• and said five-membered ring and six-membered ring may be condensed with an aromatic ring said recording information medium being adapted to have information recorded thereon by irradiating said recording medium with laser light to cause an optical change in the form of spaced-apart pits in said recording layer and being adapted to regenerating such information by laser light