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Effects of Er3+ Spatial Distribution on Luminescent Properties and Temperature Sensing of Upconverting Core-Shell Nanocrystals with High Er3+ Content

Abstract

In the upconversion nanocrystals where Er3+ acts as the activator, the concentration quenching will easily occur when the content of Er3+ is high (generally >5mol%), and the Er3+ spatial distribution which is an key factor affecting the concentration quenching is an important issue that must be considered. Herein, we selected Yb: NaErF4 as light-emitting layer and investigated its upconversion performance and temperature sensing behaviors in two kind of core-shell nanoarchitectures. Yb3+ and Er3+ activators were distributed in three-dimensional sphere and two-dimensional thin layer in the Yb: NaErF4@Yb/Nd: NaYF4@NaGdF4 and NaGdF4@Yb: NaErF4@Yb/Nd: NaYF4@NaGdF4 core-shell nanocrystals, respectively. The difference in Er3+ spatial distribution in the core-shell structure resulted in significant modification of red-to-green ratios and decay behaviors upon the excitation of 376 nm, 808 nm, 980 nm and 1532 nm, and the related mechanisms were systematically investigated. In addition, the spatial distribution of Er3+ was demonstrated to have no obvious effect on the transitions of Er3+ thermally coupled (2H11/2→4I15/2 and 4S3/2→4I15/2) and the relative sensitivity for temperature determination under 808 nm laser excitation.

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Supplementary files

Publication details

The article was received on 08 Aug 2017, accepted on 05 Oct 2017 and first published on 05 Oct 2017


Article type: Paper
DOI: 10.1039/C7DT02915B
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Effects of Er3+ Spatial Distribution on Luminescent Properties and Temperature Sensing of Upconverting Core-Shell Nanocrystals with High Er3+ Content

    D. Chen, M. Xu, M. Ma and P. Huang, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02915B

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