Abstract
Fluorescent materials doped with rare-earth ions have raised great interest because of their prominent use in near-infrared temperature sensing, where their application in biological systems is possible. In this work, the performance of Nd3+-doped calcium yttrium silicate (CYS) ceramic powder phosphor prepared by combustion synthesis method for optical temperature sensing is discussed. The material is amorphous after heat-treatment at 700 °C, and it exhibits intense near-infrared (NIR) fluorescence when the sample is irradiated by a CW laser radiation at λ ~ 532 nm. The characteristic emission peaks of Nd3+ in the NIR region, centered at 811 and 895 nm, were observed corresponding to the 4F5/2 and 4F3/2 multiplets relaxation to the ground state. By inspecting the fluorescence behavior of these NIR emissions as a function of temperature, a noticeable change on the relative intensities corresponding to transitions 4F5/2 → 4I9/2 and 4F3/2 → 4I9/2 in the temperature range of 298–673 K was observed. Through the use of the fluorescence intensity ratio technique, the optical temperature sensing performance was studied assuming a quasi-equilibrium Boltzmann population distribution among the thermally coupled levels 4F5/2 and 4F3/2. A maximum absolute sensitivity Sa of ~ 3.2 × 10−3 K−1 at 795 K and a relative thermal sensitivity Sr of 1.59% K−1 at 298 K were obtained. These results indicate that the Nd3+-doped CYS powder system studied here exhibits a potential use in thermal sensing within the first biological window (700–950 nm).
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Acknowledgements
N. R. acknowledges Conselho Nacional de Desenvolvimento Científico e Tecnológico for the support with grant number 303129/2017-4. G. S. M. acknowledges Conselho Nacional de Desenvolvimento Científico e Tecnológico for the support with grant number 305452/2019-3.
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Rakov, N., Maciel, G.S. Nd3+-doped amorphous calcium yttrium silicate ceramic powder for near-infrared thermometry. Appl. Phys. A 127, 363 (2021). https://doi.org/10.1007/s00339-021-04526-5
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DOI: https://doi.org/10.1007/s00339-021-04526-5