Fig. 2.
a–d The TEM images, the digital pictures, and XRD spectra of as-prepared OA-capped NaYF4:Yb,Er NPs and OA-free NaYF4:Yb,Er NPs, respectively
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.