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. 2018 Oct 19;8(62):35706–35718. doi: 10.1039/c8ra07441k

Fig. 1. Transmission electron microscopy (TEM) images of (a) NaYF4:Yb,Er (core), (b) NaYF4:Yb,Er@NaGdF4 (UCNP), (c) UCNP-PAA, and (d) PEG-NH2 modified BPNS (BPNS-NH2). The insets in (a–c) indicate the diameter (size) distribution obtained from the count of the corresponding nanoparticles.

Fig. 1