Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

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.

View full-text article in PMC

. 2021 Mar 13;181:113160. doi: 10.1016/j.bios.2021.113160

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2021 Elsevier B.V. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

PMC Copyright notice

Fig. 3 — Characterization results of the UCNPs@mSiO₂. (a) TEM images of NaYF4:Yb,Er@NaYF4 (UCNPs); (b)TEM images of UCNPs@mSiO₂; (c)UCL spectrum of UCNPs@mSiO₂ under 980 nm laser irradiation at a power of 1.3 W/cm²(d)UV–vis absorption spectrum of UCNP@mSiO₂-COOH and UCNP@mSiO₂-antibodies in water.