Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

1 Publication
Extending the temperature sensing range using Eu3+ luminescence up to 865 K in a single crystal of EuPO4
Sharma, S.ORC; Köhler, T.; Beyer, J.; Fuchs, M.; Gloaguen, R.; Heitmann, J.
The temperature evaluation through the measurement of emission intensities (intensity ratio method) require two distinct bands; one of which is used as a reference, and the emission intensity of other is monitored as a function of a change in temperature. Herein, we report the influence of excitation wavelengths, and a coupling scheme between 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 emission intensity was studied for different excitation wavelengths: 365 (intraconfigurational 4f2 excitation), 338 (defect excitation), and 254 nm (O2- →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 an excitation at 338 nm wavelength, and evaluating the intensity ratio between defect emission and the Eu3+ 5D0,1 → 7FJ transitions, the temperature sensing range can be extended upto at least 865 K, with relative sensitivity in the range, 0.33-1.94%K-1 (at 750 K). The results showed resolution of < 1 K with an excellent reproducibility, suggesting that the thermometers can be used with high reliability.
Keywords: photoluminescence, Eu3+ doping, temperature sensing, relative sensitivity

Publ.-Id: 29430 - Permalink