Journal
OPTICAL MATERIALS
Volume 66, Issue -, Pages 12-16Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2017.01.035
Keywords
Thermometry; CaWO4:Ho3+; Emission intensity; Spectral shift; Lifetime
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Funding
- National Natural Science Foundation of China [11674044, 11404047, 11604037]
- Natural Science Foundation Project of Chongqing [CSTC2015jcyjA5005, KJ1500409]
- Chongqing Key Laboratory Improvement Plan (Chongqing Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology), Wenfeng Innovation Foundation of CQUPT
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Optical thermometry based on trivalent rare earth doped materials has attracted much attention recently. This article reported the temperature dependent near infrared luminescence of Ho3+ doped in CaWO4 phosphors. A series of CaWO4:Ho3+ powders have been synthesized by high temperature solid state reaction. The XRD patterns showed that the Ho3+ ions have occupied the lattice sites of Ca2+ ions in the phosphors. The thermometry effect was demonstrated by different spectroscopic parameters through the emission intensity of Ho3+: I-5(6) -> I-5(8) transition at similar to 1190 nm, the spectral shift of the charge transfer band of W-O and the lifetime of Ho3+: F-5(4), S-5(2) excited state. These three optical parameters present a simple linear relation with the temperature in the range of 30-300 degrees C. This allows for accurate thermal sensing based on simultaneous measurement of these parameters. Results show that CaWO4:Ho3+ phosphors might be served as a potential candidate for thermometry. (C) 2017 Elsevier B.V. All rights reserved.
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