Check out our latest publication about upconverting nanoparticles and their shielding in aqueous environments from the link below.

Palo, E., Lahtinen, S., Päkkilä, H., Salomäki, M., Soukka, T., and Lastusaari, M., “Effective Shielding of NaYF₄:Yb³⁺,Er³⁺ Upconverting Nanoparticles in Aqueous Environments Using Layer-by-Layer Assembly” Langmuir 34 (2018) 7759-7766.
Read online: http://dx.doi.org/10.1021/acs.langmuir.8b00869