Wydział Chemii

K. Maciejewska

Przemysław Szklarz

A. Bednarkiewicz

M. D. Dramićanin

L. Marciniak

2023

Journal of Alloys and Compounds

935

168064/1-168064/7

10.1016/j.jallcom.2022.168064

Naukowa

Angielski

Artykuł

It was demonstrated that he temperature-driven irreversible structural phase transformations in the Eu³⁺ activated LaPO₄, La_0.5Y_0.5PO₄, and YPO₄ nanocrystals can be used for the thermal history measurements over the 200^oC-1000^oC temperature range. Increase of the temperature caused significant changes in the Eu³⁺ local surroundings and, in consequence modified the intensity and the emission spectra. We showed that the intensity ratio of Eu^{3+ 5}D₀→ ⁷F₂ to ⁵D₀→⁷F₁ emissions may serve as a highly-sensitive indicator of the highest temperature to which the nanocrystals were exposed to. The relative sensitivity of Y_0.5La_0.5PO₄:2 %Eu³⁺ based thermal history paint was as high as 0.8 %/°C at 1000 °C. The thermal history surface map of the square steel plate covered with Y_0.5La_0.5PO₄:2 %Eu³⁺ paint, heated locally at one of the corner is obtained as proof-of-concept experiment. The proposed ratiometric readout strategy facilitates measurement and enhances the accuracy of thermal history analysis.

Luminescent nanoparticles, Rare earths orthophosphates, Structural transformation, Thermal history sensors

http://dx.doi.org/10.1016/j.jallcom.2022.168064

http://www.elsevier.com