Fig. 7
From: Recent progress in the development of upconversion nanomaterials in bioimaging and disease treatment
Copyright 2015. American Chemical Society. Reproduced with permission.)
a Hydrophilic modification structural illustration of a multicolor core/shell UCNP, b–e TEM images of the UCNP before the growth of NaYF4:Yb3+/Er3+ shell core and after functionalization of NaYF4:Yb3+/Er3+ with zinc-dipicolylamine analog (TDPA-Zn2+) and MSNs [114]. (
