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Updated: Aug 25, 2025

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
Published on: November 10, 2017
Influence of NaYF4 Inert and Active Layer on Upconversion Luminescence
Zhaojin Wang1, Shebao Lin1, Yajun Liu1
1Institute of Physics and Optoelectronics Technology, Baoji University of Arts and Sciences, Baoji 721016, China.
Abstract:
NaYF4:Yb,Er@NaYF4 core-shell nanostructures were prepared to investigate their influence on upconversion (UC) luminescence. Tests revealed green radiation (4S3/2→4I15/2) and red radiation (4F9/2→4I15/2) first increased and then gradually decreased as Yb concentration increased in the NaYF4 shell. The strongest fluorescent radiation occurred at an Yb concentration of 5%. To investigate the complicated variation of luminescence, we designed a set of experiments to study the impact of Yb ion concentration on luminescence intensity, and we analyzed the corresponding enhancement mechanism. It is probable that the energy transfers between both Yb and Er ions and Yb and Yb ions are involved in the UC processes. The enhancement of hybrid nanostructures has huge potential in biological detection and solar cells.
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