Abstract
In order to fabricate metal-free J-aggregate, merocyanine(MD)/spiropyran(SP) mixed LB film was transferred on a glass plate from a pure aqueous solution. Upon UV-light illumination, SP molecules isomerized from SP-form to photomerocyanine (PMC)-form and PMC-form molecules formed J-aggregate with self-assembly. Subsequent vapor-treatment of dimethylamine (DMA) aqueous solution after UV-light illumination induced J-aggregate formation of MD molecules. Metal-free J-aggregate of MD dye was formed by the stepwise treatment of UV illumination and the DMA vapor treatment. The formation mechanism of J-aggregate was discussed.
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