Abstract
In this study, photochemical properties including singlet oxygen production of a natural alkaloid-type dye berberine were investigated in water and on a clay. Berberine adsorbed on the clay showed an increase in the fluorescence quantum yield and fluorescence lifetime. In particular, the fluorescence enhanced about 1000 times, which is the highest in luminescence enhancement achieved by clay. The effect of clay on the energy level such as the charge separation state was thought to be one of the factors responsible for fluorescence enhancement. Furthermore, it was found that the clay improved the singlet oxygen production quantum yield of berberine to 0.022, while berberine did not generate singlet oxygen in water. So far, the effects of complexing dye molecules with clay were mainly focused on the photo-physicochemical processes such as the absorption wavelength, fluorescence quantum yield, and excited lifetime of dye molecules, but this research revealed that complexing with clay can improve the efficiency of the photochemical reaction such as singlet oxygen generation.
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