Journal
MICROCHIMICA ACTA
Volume 184, Issue 8, Pages 2661-2669Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-017-2278-0
Keywords
Remote sensing; Luminescence; Temperature sensors; Rare-earth; FIR technique; Energy transfer; J-O theory; X-ray diffraction; Solid-state reaction; Optical thermometer
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Funding
- National Research Foundation of Korea (NRF) Grant - Korea government (MSIP) [2015R1A5A1037656]
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The authors have synthesized Er(III)-doped BiOCl microplates by a solid-state reaction method. Under irradiation with 980 nm light, the microplates emit both green and red upconversion emissions originating from the transitions of Er(III) ions. By properly adjusting the concentration of the Er(III) ions, the colors can be tuned from pure green to yellowish green. The optimal doping concentration is 3 mol%. Furthermore, the ratio of the two green emission bands of the Er(III) ions is strongly temperature-dependent. The doped microplates can be used to sense temperature in the 298 to 778 K range, indicating a maximum sensitivity of 2.8 x 10(-3) K-1. The sensitivity is independent of Er(III) ion concentration. The internal heating properties of the microplates induced by the laser excitation are also discussed. Theoretical analysis reveals that the temperature of the doped BiOCl microplates increases from 276 to 324 K with elevating the laser power from 246 to 445 mW.
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