Extending the temperature sensing range using Eu3+ luminescence up to 865 K in a single crystal of EuPO4.
Phys Chem Chem Phys
; 21(29): 16329-16336, 2019 Jul 24.
Article
em En
| MEDLINE
| ID: mdl-31309210
ABSTRACT
Temperature evaluation through the measurement of emission intensities (the intensity ratio method) requires two distinct bands, one of which is used as a reference, and the emission intensity of the other is monitored as a function of a change in temperature. Herein, we report the influence of the excitation wavelength and a coupling scheme between the lanthanoid and defect emission from the host lattice to extend the temperature sensing range by using a single crystal of europium(iii) phosphate. The temperature dependence of the emission intensity was studied for different excitation wavelengths 365 (intraconfigurational 4f2 excitation), 338 (defect excitation), and 254 nm (O2- â Eu3+ charge-transfer excitation), in the temperature range 293-865 K. We determined the Boltzmann equilibrium among different coupling schemes using a linear regression model to infer that for excitation at a 338 nm wavelength, and evaluating the intensity ratio between defect emission and the Eu3+ 5D0,17FJ transitions, the temperature sensing range can be extended up to at least 865 K, with relative sensitivity in the range 0.33-1.94% K-1 (at 750 K). The results showed a resolution of <1 K with excellent reproducibility, suggesting that the thermometers can be used with high reliability.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2019
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Article