Fig. 3

GPRPP-Y8U@P has outstanding NIR-II imaging ability and tissue penetration depth. a NIR-II imagines of GPRPP-Y8U@P under 1064 nm at different concentrations. b The penetration depth is under 3% agar. c The penetration depth under the chicken breast block. d Quantification data of fluorescence signal intensity in (a). e The Signal–Noise-Ratio under the corresponding chicken breast block in (c). f The full width at half maximum in (c)