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The excitation and fluorescence spectra of the L-RB film after it was immersing to a 5.0 µM NaTPBF solution (pH 4.0, adjusted with a 0.1 M CH3COOH/CH3COONa buffer solution) (1: excitation spectrum), (2: fluorescence spectrum), and that of the pH 4.0 buffer solution (0 µM NaDBS solution) (3: excitation spectrum), (4: fluorescence spectrum) for 30 min, respectively.
