Journal
CERAMICS INTERNATIONAL
Volume 39, Issue 2, Pages 1129-1134Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.07.036
Keywords
Y2O3; Spray pyrolysis; Thermometry; Up-conversion
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Funding
- Ministry of Science and Education of the Republic of Serbia [45020, 171022]
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Recently, trivalent rare earth doped materials have received significant attention due to the strong temperature dependence of the fluorescence emission of these materials, which can be useful in temperature sensing. Here, we investigated Y2O3 ceramic powders doped with Yb3+ and co-doped with either Tm3+ or Ho3+. The powders were obtained via spray pyrolysis at 900 degrees C and additionally thermally treated at 1100 degrees C for 24 h. Structural characterization using X-ray powder diffraction confirmed the cubic bixbyte structure. Scanning electron microscopy (SEM) revealed that the particles exhibit a uniform spherical morphology. The up-conversion emissions were measured using laser excitation at 978 nm, resulting in the following transitions: blue emission in the range of 450-500 nm, weak red emission in the range of 650-680 nm and near infrared emission in the range of 765-840 nm for Tm3+, as well as green emission centered at 550 nm and weak near infrared emission at 755 nm for the Ho3+ ions. In addition, the temperature dependence of the fluorescence intensity ratios of different Stark components was analyzed in the range of 10-300 K. Significant temperature sensitivity was detected for several components, with the largest value of 0.097 K-1 related to the intensity ratio of I-536 and I-772 emissions observed for the Y2O3:Yb,Ho powder. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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