Up-conversion emission characteristics and temperature measurement of core-shell structured NaGdF4: Er3+Tm3+/Yb3+@NaYbF4: xYb3+ (x = 25, 50) phosphors
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Updated: May 13, 2025

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
Published on: November 10, 2017
Xuecheng Li1, Haoyue Hao1, Liang Li1
1School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zi Bo 255000, PR China.
Abstract:
In this study, the intensity and properties of up-conversion luminescence in core-shell structured NaGdF4: Er3+/Tm3+/Yb3+@NaGdF4: Yb3+ phosphors were investigated. After coating the NaGdF4: 0.5Er3+/0.5Tm3+/30Yb3+ (0.5Er/0.5Tm/30Yb) core with NaGdF4: xYb3+ (x = 25, 50) shells, the luminescence intensity of the phosphors was improved. The enhancement factor reached to 3.97 (x = 25) and 1.15 (x = 5) respectively. Owing to the different increase of up-conversion luminescence peak, the emission color changed from blue-green to yellowish-green in NaGdF4: 0.5Er3+/0.5Tm3+/30Yb3+@NaGdF4: 25Yb3+ (0.5Er/0.5Tm/30Yb@25Yb) phosphors. Additionally, the temperature sensing properties of the 0.5Er/0.5Tm/30Yb@25Yb phosphors were examined. A maximum relative sensitivity (Sr) of 0.013 K-1 was observed at 303 K based on florescence intensity ratio of two green emission. And a higher Sr of 0.034 K-1 was recorded at 403 K based on the ratio of green (540 nm) and near-red emissions (800 nm). These findings not only deepen the understanding of the up-conversion processes in core-shell structured phosphors but also promote the development of rare-earth ion core-shell structures for applications in temperature sensing and luminescent displays.
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