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Plasmonic modulation of the upconversion fluorescence in NaYF4 :Yb/Tm hexaplate nanocrystals using gold nanoparticles
Hua Zhang1, Yujing Li, Ivan A Ivanov
1Department of Materials Science and Engineering, University of California, Los Angeles, 90095, USA.
Angewandte Chemie (International Ed. in English)
|March 18, 2010
Abstract:
Automatic upgrade: attachment of gold nanoparticles (NPs) onto upconversion nanocrystals (NCs) results in plasmonic interactions that lead to a significant enhancement of upconversion emission of more than 2.5. Conversely, formation of a gold shell greatly suppresses the NC emission because of considerable scattering of excitation irradiation (see picture; a=NC before seed attachment; b, c=NC with attached Au NPs; c=NC with Au shell; scale bar=50 nm).
