التفاصيل البيبلوغرافية
| العنوان: |
Pr3+:LiGdF4 microparticles for optical temperature sensing. |
| المؤلفون: |
Morozov, O.A.1 (AUTHOR) uh4rad@rambler.ru, Korableva, S.L.2 (AUTHOR), Pudovkin, M.S.1,2 (AUTHOR) jaz7778@list.ru, Shakirov, A.A.2 (AUTHOR), Shavelev, A.A.2 (AUTHOR), Cherosov, M.A.2 (AUTHOR), Klimovitskii, A.E.3 (AUTHOR) |
| المصدر: |
Solid State Communications. Aug2022, Vol. 351, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*LASER pulses, *SPACE groups, *TEMPERATURE, *SINGLE crystals, *HIGH temperatures, *ABSOLUTE value, *SPECIFIC heat |
| مستخلص: |
Single crystal of Pr3+:LiGdF 4 (C Pr = 0.01 at.%) was grown in the resistive furnace by the Bridgman-Stockbarger method. The crystal was milled in an agate mortar. The obtained powder had a tetragonal structure (88 space group I4 1 /a). The specific heat of the sample gradually increases with the increase of temperature from 0.46 (at 200 K) to 0.62 J/g·K (at 389 K). These values are notably less in comparison to the phosphors based on LiYF 4 and LiLuF 4 counterparts. The luminescence spectra of Pr3+:LiGdF 4 microparticles under 442 nm pulse laser excitation demonstrated temperature dependence of its shape in the 80–680 K temperature range. Specifically, the intensity of 3P 1 – 3H j emission increases in reference to 3P 0 – 3H j emission with the increase of temperature. This phenomenon was explained by the fact that 3P 1 and 3P 0 electron levels share their electron populations according to the Boltzmann law. The luminescence intensity ratio (LIR) was taken as a temperature-dependent parameter. The maximal absolute temperature sensitivity (S a) was equal to 0.010 K−1 at 320 K. This value is bigger in comparison to other Pr3+ doped counterparts. The high temperature sensitivity in the 250–450 K temperature range allows using the Pr3+:LiGdF 4 phosphors for biological and industrial applications. The relatively low specific heat minimizes the impact of the phosphors on the studied object for which the temperature reading is performed. • The Pr3+:LiGdF 4 (C Pr = 0.01 at.%) micro-particles had a tetragonal structure. • Pr3+:LiGdF 4 (C Pr = 0.01 at.%) demonstrated low specific heat (0.57 J/g·K at 320 K). • Pr3+:LiGdF 4 (C Pr = 0.01 at.%) demonstrated high value of absolute temperature sensitivity (0.010 K−1 at 320 K). [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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