Huan-jun ZHANG, Xing-bang DONG, Hai-ning LI, et al. Upconversion Emission and Temperature Sensing of R-LaOF:Er, Yb. [J]. Chinese Journal of Luminescence 41(5):536-541(2020)
Huan-jun ZHANG, Xing-bang DONG, Hai-ning LI, et al. Upconversion Emission and Temperature Sensing of R-LaOF:Er, Yb. [J]. Chinese Journal of Luminescence 41(5):536-541(2020) DOI： 10.3788/fgxb20204105.0536.
Upconversion Emission and Temperature Sensing of R-LaOF:Er, Yb
Recent years, Up-conversion(UC) luminescence exhibits potential application in temperature measurement based on FIR(fluorescence intensity ratio) technique, which has drawn considerable attention. Lanthanum oxyfluoride(LaOF) inherits the advantage of low lattice phonon energy, and exhibits superior thermal and chemical stability, showing efficient UC luminescence. Thus, limited attention has been paid to the temperature sensing characteristics of Er,3+,/Yb,3+, co-doped LaOF. In the present work, rhombohedral LaOF:Er, Yb phosphors are prepared using hydrothermal method. The structure and fluorescence properties are characterized by X-ray diffraction, SEM and fluorescence spectra. Hexagonal LaF,3, is prepared using hydrothermal method at 120℃. After annealing at 1 000℃, rhombohedral LaOF is obtained. The agglomerated particle crystallizes into one larger particle in the range of several micron following annealing. Excited by 980 nm, the characteristic emission from the Er,3+, ion is observed, including two green emission bands and one red emission,2,H,11/2,→,4,I,15/2, and ,4,S,3/2,→,4,I,15/2, as well as ,4,F,9/2,→,4,I,15/2, transitions. Energy transfer between Er,3+, and Yb,3+, is confirmed because of two-photon process, resulting in upconversion emissions. Finally, the optical temperature sensing properties of R-LaOF:Yb, Er are investigated. The results suggest that R-LaOF:Er, Yb exhibits intense emission and high sensitivity. Its maximum relative sensitivity ,S,R, and absolute sensitivity,S,A, are 0.037 K,-1,and 0.004 3 K,-1, respectively in the temperature range of 150-400 K, suggesting it is a potential candidate in temperature sensing.
upconversion emissiontemperature sensingfluorescence intensity ratio techniquesensor sensitivity
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College of Science， Dalian Maritime University
Institute of Laser Engineering， Faculty of Materials and Manufacturing， Beijing University of Technology
School of Chemistry and Chemical & Environmental Engineering， Weifang University
School of Electrical Engineering， Huainan Normal University
Beijing National Laboratory for Molecular Sciences， State Key Laboratory of Rare Earth Materials Chemistry and Applications， PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry， College of Chemistry and Molecular Engineering， Peking University