OPTICAL INFORMATION RECORDING MEDIUM

摘要

This invention provides an optical information recording medium comprising a recording layer on which information can be recorded under irradiation with a laser beam at 440 nm or less. In the optical information recording medium, the recording layer contains an oxonol dye represented by general formula (1), and a counter cation (Y^t+) of the dye is a cationic dye having an absorption maximum in a wavelength range longer than the absorption maximum at the dye anion site. [Chemical formula 1] General formula (1) wherein A, B, C and D represent an electron withdrawing group, wherein A and B, or C and D may be attached to each other to form a ring, or, when A and B, or C and D are not attached to each other, the total Hammett sp value of A and B (and C and D) is not less than 0.6; R represents a substituent on the methine carbon; m is an integer of 0 or 1; and n is an integer of 0 to 2m + 1, provided that, when n is an integer of 2 or more, a plurality of Rs may be different from each other or may be attached to each other to form a ring; and Y^t+ represents a cation having a valence of t which is an integer of 1 to 4.