Red-yellow fluorescence patterning of a polymer film containing phthalimido carbamate groups

Bicolor fluorescent micro-patterns in the polymer film are prepared through the use of a new group of photobase generator containing phthatimido 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.