Shielding Upconversion by Surface Coating : A Study of the Emission Enhancement Factor

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)766-770
Journal / PublicationChemPhysChem
Volume17
Issue number5
Online published30 Sept 2015
Publication statusPublished - 3 Mar 2016

Abstract

Surface coating is a commonly used strategy to enhance up conversion emissions by shielding the luminescent core from surface quenching. In this work, we provide insights into the effect of surface coating on upconversion by investigating NaYF4:Yb/Er nanoparticles and the corresponding NaYF4:Yb/Er@NaYFcore–shell nanoparticles, as a function of dopant concentration of Yb3+and excitation power. We observe declining emission enhancement factors with decreasing Yb3+concentration and increasing excitation power. Our mechanistic investigations suggest that the phenomenon originates from stepwise excitation in the upconversion process, as well as energy hopping among the Yb3+ dopants. This increased understanding of the effect of surface coating on upconversion should be important towards the rational design of lanthanide-doped core–shell nanoparticles for various applications.

Research Area(s)

  • core-shell structures, energy transfer, luminescence, nanoparticles, upconversion

Citation Format(s)

Shielding Upconversion by Surface Coating: A Study of the Emission Enhancement Factor. / Sun, Tianying; Ma, Ronghua; Qiao, Xvsheng et al.
In: ChemPhysChem, Vol. 17, No. 5, 03.03.2016, p. 766-770.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review