| 摘要 |
PURPOSE:To economically obtain a recording medium which is chemically and physically stable and has sufficient absorbance or reflectance in the oscillational region of a semiconductor laser, by providing an organic thin film layer comprising at least one phthalocyanine compound, on a substrate. CONSTITUTION:A recording layer comprising a phthalocyanine compound of formula [I] is provided on a transparent substrate. In the formula, each of rings A1-A4 is independently a benzene ring, naphthalene ring or anthracene ring; M is hydrogen, a metal to which a halogen or oxygen may be bonded, or the like; each of R1, R2, R3 and R4 is a substd. or unsubstd. aliphatic hydrocarbon group or an aromatic hydrocarbon group or aromatic heterocyclic ring group: each of R5, R6, R7 and R8 is hydrogen or the like; and each of k, l, m and n is independently an integer of 0-4, all of which are not 0 at the same time. This recording material is physically and chemically stable and has sufficient absorbance or reflectance in the oscillational region of a semiconductor laser. |
