Fig. 2. (Color online) Since the redshift effect between excitation and emission spectra is described by the Stokes effect, the difference in excitation spectrum between LAB+bis-MSB and LAB+PPO+bis-MSB samples can be explained by the presence of resonance energy transfer through PPO. The excitation spectrum of each sample is obtained by selecting the zero order of the diffraction grating that makes up the detector's optical system. The zero order of the detector's diffraction grating means that all wavelength bands are passed through by reflection, rather than selecting specific wavelength bands by diffracting the sample's fluorescence.
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