OPTICAL INFORMATION RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a write-once optical information recording medium capable of optically recording with a high sensitivity in a blue light region and having a recording layer not crystallized when a film is formed capable of dealing with a recording and reproducing wavelength region of 400 to 500 nm or particularly with a short wavelength region of 400 to 450 nm, and to provide an optical information recording medium capable of recording and reproducing even in a different recording and reproducing wavelength without using an organic material mixture. SOLUTION: In the optical information recording medium comprises a recording layer 2 made of a compound having a structure for bonding four pyrrole rings which each may have a substituent directly or through a carbon atom which may have a substituent on at least a substitute 1, the layer 2 contains a compound having totally three carbon atoms which each may have a substituent for bonding the four pyrrole rings.