Time-integrated luminescence thermometry of Eu³⁺ and Dy³⁺ doped YVO<inf>4</inf>

Abstract

Photoluminescence spectra of bulk YVO4 doped with 1 mol% of Eu3+ and Dy3+ were recorded on the range from room temperature to 733 K, in 20 K steps. The temperature sensing performances were estimated by the luminescence intensity ratio, line-broadening and line-shift methods. The luminescence intensity ratio was tested by the ratio of intensities of 5D1→7F1 and 5D0→7F2,4 transitions of Eu3+, and 4I15/2→6H15/2 and 4F9/2→6H15/2 transitions of Dy3+. The temperature dependent line-broadenings were measured on 5D0→7F2 and 4F9/2→6H13/2 of Eu3+ and Dy3+, respectively. The line-shifts were investigated on 5D0→7F1 and 4F9/2→6H15/2 of Eu3+ and Dy3+, respectively. The experimental data of all three methods is fitted and is in excellent agreement with the theory. The calculated thermometric figures of merit, absolute and relative sensitivities, show the sensor performances at the given temperature, and allow the selection of the best sensor material or transition to be chosen for the desired temperature range.