Figure 4From: FITC and Ru(phen)3 2+ co-doped silica particles as visualized ratiometric pH indicator Variations in the emission intensity ratios ( I 520 / I 585 ) of the co-doped silica particles. Recoded at the start pH (pH = 4) and end pH (pH = 8) of different cycles. The excitation wavelength was at 450 nm.Back to article page