4.7 Article

Temperature sensing down to 4 K with erbium-doped tellurite glasses

Journal

JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 575, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jnoncrysol.2021.121183

Keywords

Tellurite glasses; Optical temperature sensor; Rare earths; up-conversion luminescence; Low-temperature photoluminescence

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Two binary tellurite glasses with different concentrations of Er3+ ions were prepared and compared for their potential use in optical temperature sensing at cryogenic temperatures. By optimizing the concentration of erbium ions, luminescence intensity ratio of selected levels can be used for non-contact optical temperature sensing.
Two binary tellurite glasses within TeO2-PbCl2-WO3 system with different concentrations of Er3+ ions were prepared by the conventional melt-quench technique and their optical properties were compared with emphasis on their potential use for temperature sensing starting from 4 K. Therefore, absorption and emission spectroscopy was used to determine the emission properties of Er3+ in the visible and near-infrared regions across a wide temperature range of 4-300 K. Photoluminescence emissions resulting from direct absorption or frequency up conversion were measured across a wide temperature range and their dependence on the concentration of erbium ions and on excitation power density were studied in detail. It was demonstrated that by optimizing concentration of erbium ions, the luminescence intensity ratio of suitably selected thermally coupled/uncoupled levels and their Stark sublevels can be used for the non-contact optical temperature sensing at cryogenic temperatures.

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