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Rare earth-doped tellurite glasses for wide-range non-contact temperature sensing from cryogenic to room temperature

Autoři: Kostka Petr | Yatskiv Roman | Smolík Jan | Jílková Kristýna | Zavadil Jiří

Rok: 2025

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

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Jazyk	Název	Abstrakt	Klíčová slova
eng	Rare earth-doped tellurite glasses for wide-range non-contact temperature sensing from cryogenic to room temperature	We demonstrate that suitably doped tellurite glasses can be used for remote non-contact temperature sensing from cryogenic temperatures (4 K), which is typically the domain of crystalline phosphors. For non-contact temperature sensing, thermally coupled levels of rare earth ions are commonly used. The erbium ion 2H11/2 and 4S3/2 levels (emissions around 530 and 550 nm, respectively) are relatively close to each other, with a difference between them less than 750 cm-1, and can therefore be considered as thermally coupled. The population of these levels, and thus the intensity of the corresponding emission bands, should follow a Boltzmann-type energy distribution. We demonstrate that changes in the intensity ratio of these emission bands can be used for temperature sensing from 100 K upwards, both using conventional photoluminescence (excitation 514 nm) and upconversion (excitation 980 nm). This limit is caused by the emission around 530 nm (2H11/2→4I15/2) being practically quenched at temperatures below 100 K. However, when using upconversion and intensity ratios of bands that are not thermally coupled, the detection limit can be extended to cryogenic temperatures. The demonstrated limit of 4 K appears to be only limited by our experimental equipment's inability to reach lower temperatures.	temperature sensing; non-contact; optical sensor; tellurite glass; rare earths; photoluminescence

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