REWRITABLE OPTICAL MEMORY MATERIAL USING CHANGE IN FLUORESCENCE BY PHOTOIRRADIATION OR HEAT TREATMEN

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PROBLEM TO BE SOLVED : To provide a material capable of realizing recording of high density information by multiple recording. SOLUTION : The optical memory material is obtained by incorporating rare earth ions into a polymer having a carbonyl group in a backbone or a side chain of the polymer, increases a degree of fluorescence in accordance with a quantity of applied light, and is restored to the initial state by heat treatment. The optical memory material is particularly a polymer film obtained by dissolving a polymer having a carbonyl group in a backbone or a side chain of the polymer and a compound of a rare earth element forming an ion of the rare earth element in a solvent which dissolves at least the two components and by incorporating the above rare earth ions into the above polymer formed from the resulting solution; is fine polymer particles containing the above rare earth ions formed in a particle diameter of 5-10, 000 nm by injecting the solution into a bad solvent for at least the above two components; and is a fine particle film formed from the above fine particles; or is a bulk molded article from the above fine particles.