Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 706, Issue -, Pages 156-163Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.02.245
Keywords
KNN-EB; Transparent ceramic; Photoluminescence; Color-tunable; Optical temperature sensing
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Funding
- National Natural Science Foundation of China [51602055]
- Qishan Scholar Scientific Research Startup Project of Fuzhou University [XRC-1626]
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The lead-free 0.985(K0.5Na0.5) NbO3-0.015ErBiO(3) (KNN-EB-0.015) ceramic was fabricated by pressureless sintering. It possessed a pure perovskite phase with pseudo-cubic symmetry. Due to the fine-grains, small-sized pores, dense microstructure and relaxor-like characteristics, the ceramic was optically clear, exhibiting the highest transmittances of similar to 40% and similar to 71% in the visible and infrared regions, respectively. The photoluminescence (PL) properties of the ceramic were studied, including the up-conversion (UC) green and red emissions, down-conversion near infrared emission as well as the emission lifetimes. The color-tunable (from green to yellow) UC emissions were observed by increasing the temperature, based on the temperature-dependent emission spectra, which also exhibited good thermal stability (52.6% of the initial intensity at 453 K) of the ceramic. Additionally, the temperature sensing properties were investigated using the fluorescence intensity ratio technique. A maximum sensitivity of similar to 0.0048 K at 603 K was obtained. Combined with the good optical and electrical properties, the KNN-EB-0.015 transparent ceramic could be a promising candidate for multifunctional optoelectronic applications. (C) 2017 Elsevier B.V. All rights reserved.
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