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One-photon excited fluorescence spectra of the same amount of water-dispersed silica nanoparticles entrapping (a) only 20 wt% BDSA, (b) only 1.1 wt% HPPH, and (c) 1.1 wt% HPPH/20 wt% BDSA together. Because of significant overlapping of BDSA and HPPH emission spectra, the composite fluorescence spectra in (c) were deconvoluted. Curves (d), (e) present the deconvoluted BDSA and HPPH fluorescence spectra, respectively. The excitation wavelength was 425 nm.
