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. 2021 Feb 15;19:47. doi: 10.1186/s12951-021-00787-7

Fig. 3.

Fig. 3

a The fluorescence spectra of b-CDs mixed with various concentrations of y-CDs. b The UV–vis absorption spectrum of y-CDs and the fluorescence spectrum of b-CDs. c The fluorescence spectra of b-CDs mixed with various concentrations of y-CDs-APT. d The fluorescence lifetime spectra of b-CDs, b-CDs + y-CDs and b-CDs + y-CDs-APT