Journal
PHYSICA B-CONDENSED MATTER
Volume 521, Issue -, Pages 270-274Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2017.07.011
Keywords
Upconversion; LaF3; Ytterbium; Temperature sensing
Categories
Funding
- National Natural Science Fund of China [31201377, 11404292]
- Fund for Young Backbone Teachers of Universities in Henan Province [2014GGJS-085, 2013GGJS-111]
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The structural and optical properties of Er3+/Yb3+ codoped LaF3 phosphors are investigated using X-ray diffraction (XRD) and upconversion luminescence spectra. The result shows that the hexagonal phase of LaF3 keep stability at temperature lower than 800 degrees C in air condition and will be oxidized to be LaOF at higher temperature. Its upconversion emission intensity varies with the doping concentrations of Yb3+ ions and reaches a maximum at around 7 mol% Yb3+. The power-dependent luminescence reveals the possible emission mechanisms and the corresponding upconversion processes. Furthermore, the optical temperature sensing properties of LaF3: Er3+/Yb3+ are studied based on the fluorescence intensity ratio (FIR) technique for two thermally coupled levels (H-2(11/2) and S-4(3/2)) of Er3+. The maximum sensitivity is found to be about 0.00157 K-1 at 386 K, revealing this phosphor to be a promising prototype for applications in optical temperature sensing.
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