Synthesis of monodisperse NaYF 4:Yb, Tm@SiO 2 nanoparticles with intense ultraviolet upconversion luminescence

Feng Shi, Xuesong Zhai, Kezhi Zheng, Dan Zhao, Weiping Qin

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

In this paper, the NaYF 4:Yb, Tm upconversion (UC) nanoparticles (NPs) were synthesized using a solvothermal approach, and the core-shell structured NaYF 4:Yb, Tm@SiO 2 NPs, coated with a thin layer of SiO 2 on the surface of the NaYF 4:Yb, Tm NPs, were prepared by a typical Stöber method. X-ray diffraction (XRD), transmission electron microscopy (TEM), and luminescence spectroscopy were applied to characterize these samples. The obtained core-shell structured NaYF 4:Yb, Tm@SiO 2 NPs exhibited a perfect spherical morphology with narrow size distribution and smooth surfaces. Under 980 nm excitation, NaYF 4:Yb, Tm and NaYF 4:Yb, Tm@SiO 2 samples showed intense ultraviolet UC luminescence, which originated from the 1D 23H 6, 1I 63F 4 transitions of Tm 3+. These NPs have great potential for applications as fluorescent labels, imaging probes, optical storage, photodynamic therapy (PDT) in deep tissue, and solid-state lasers.

Original languageEnglish
Pages (from-to)9912-9915
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume11
Issue number11
DOIs
StatePublished - 2011
Externally publishedYes

Keywords

  • Luminescence
  • NaYF
  • Nanoparticles
  • Upconversion

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