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Bicolor fluorescent micro‐patterns in the polymer film are prepared through the use of a new group of photobase generator containing phthalimido carbamate groups. The photobase generation from phthalimide carbamates is studied by examining the changes in pH, fluorescence intensity, and photo‐crosslinking of poly(glycidyl methacrylate). The product analysis of a model compound indicates that amine groups are produced from the photolytic cleavage of the C–N bond of the phthalimide carbamate groups. A copolymer containing phthalimide carbamate groups is applied to a bicolor fluorescent imaging material. Red‐yellow fluorescent micropatterns are obtained by treating the copolymer film, which is irradiated with 254 nm UV light through a photomask, with fluorescamine and rhodamine, consecutively. Various colored fluorescent micropatterns – green, red, or red‐yellow, are obtained on a single polymer film by varying the excitation wavelength.
A polymer film containing phthalimido carbamate groups is used as a bicolor fluorescent imaging material. This photopatterning method enables fluorescence images of different colors to be stored within the same film. The patterns are selectively observed by varying the excitation wavelength, as shown in the figure.