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Issue 33, 2017
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Emission color tuning of core/shell upconversion nanoparticles through modulation of laser power or temperature

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Abstract

Upconversion nanoparticles (UCNPs) are an excellent choice to construct security features against counterfeiting, owing to their unique NIR-to-VIS upconversion luminescence (UCL) characteristics. However, the application of upconversion materials is limited, due to their single and invariant emission colors. Herein, the temperature-dependent UCL properties of NaGdF4:Yb/Ho (or Tm) UCNPs in the solid state have been investigated. An anomalous UCL enhancement at higher temperatures has been demonstrated for these small-sized (<10 nm) UCNPs and the underlying mechanism is discussed herein. Meanwhile, effective UCL with tunable multicolor emissions has been realized by the rational incorporation of Ho3+ and Tm3+ emitters into a single nanostructure. The emission colors of these Ho/Tm co-doped Na(Gd,Yb)F4 UCNPs can be tuned by changing the laser power or temperature, due to the different spectral sensitivities of the Tm3+ and Ho3+ emitters to the excitation power density and temperature. The power- and temperature-responsive color shifts of these Ho/Tm co-doped UCNPs are favorable for immediate recognition by the naked eye, but are hard to copy, offering the possibility of designing more secure anti-counterfeiting patterns.

Graphical abstract: Emission color tuning of core/shell upconversion nanoparticles through modulation of laser power or temperature

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Publication details

The article was received on 24 May 2017, accepted on 30 Jul 2017 and first published on 01 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR03682E
Citation: Nanoscale, 2017,9, 12132-12141
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    Emission color tuning of core/shell upconversion nanoparticles through modulation of laser power or temperature

    Q. Shao, G. Zhang, L. Ouyang, Y. Hu, Y. Dong and J. Jiang, Nanoscale, 2017, 9, 12132
    DOI: 10.1039/C7NR03682E

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