チオピロロピロールの固体スペクトルと光ディスクへの応用 [in Japanese] Solid-State Spectra of Dithioketopyrrolopyrrole and their Application to Optical Disks [in Japanese]
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Dithioketopyrrolopyrrole (blue pigment) is known to crystallize in three crystal phases I, II and III, among which only modification III exhibits an intense near-IR absorption. The mechanism of the near-IR absorption has been discussed on the basis of the crystal structure and exciton coupling effects. The J-aggregate-like molecular stack characterized by "bricks in a brick wall" is found to be responsible for the near-IR absorption. The switching of the near-IR absorptin by forming or disturbing the J-aggregate-like structure can be applied to an optical disk of the "write once" type. The disk developed exhibits a reflectivity change from about 30% to 45% on writing with a power of about 9mW at 780nm.
X-RAYS 39(2), 188-194, 1997-04-28
The Crystallographic Society of Japan