OPTICAL THERMOSENSORS BASED ON THE GLASSES Er2S3–Ag0,05Ga0,05Ge0,95S2
DOI:
https://doi.org/10.32782/pet-2025-1-15Keywords:
sensors, glassy alloys, chalcogenide semiconductors, photoluminescence, rare earth metals, radiation, photosensorsAbstract
Optical sensors are one of the most promising technologies in modern solid-state physics and chemistry. They enable precise measurements and control of temperature, radiation levels, and monitoring of the pollution of various objects without physical contact. The use of such sensors significantly expands the capabilities in industrial production, medicine, and ecology. The relevance of optical sensor research is increasing with the development of modern technologies and the growing demands for accuracy, speed, and safety of measurements. They are used in fields that require high sensitivity to changes in temperature, pressure, humidity, gas concentrations, etc. The luminescent properties of chalcogenide glass alloys with the composition Er2S3–Ag0,05Ga0,05Ge0,95S2 at 0.42 mol.% Er2S3 were investigated. Photoluminescence was observed with emission peaks at 660, 860, and 980 nm upon excitation with a 532 nm wavelength laser. With an increase in temperature, the ratio between the intensities of the photoluminescence changes. The most sensitive to temperature variations was the photoluminescence peak at 860 nm. Based on the formula describing the probability of radiative and non-radiative processes, a model was built to determine the dependence of the photoluminescence intensity on temperature. According to the experimental dependence I(T), the activation energy was calculated (ΔE = 90 meV), which defines the energy required for the transition of erbium ions from the 4S3/2 state to the 2H11/2 state.A linear relationship between the intensity ratio of photoluminescence Ln (I980/I660) and the sample temperature was established. The sensor sensitivity was calculated to be 0.43 K⁻¹. Thus, the investigated glasses, within a limited temperature range, can be used as optical thermosensors.
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