Journal
NANOSCALE
Volume 9, Issue 33, Pages 12132-12141Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr03682e
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Funding
- Natural Science Foundation of Jiangsu Province of China [BK20160073]
- Jiangsu Key RD Program [BE2015102]
- Jiangsu Key Laboratory for Advanced Metallic Materials [BM2007204]
- Fundamental Research Funds for the Central Universities [2242016K40012]
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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 codoped Na(Gd, Yb) F-4 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.
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