Exploring the Possibility of Using Stark Lines of Pr³⁺ in CaTiO₃ Perovskite for Low Temperature Luminescence Thermometry

Abstract

Herein, we perform detailed analysis of the photoluminescence emission spectra, first to identify the stark splitting lines and later to use the luminescence intensity ratio between different Stark split levels of 1 D 2 → 3 H 4 f−f transitions of Pr 3+ in CaTiO 3 perovskite host for an interesting application of luminescence thermometry. The measurements were performed in the temperature range 10−295 K to understand the luminescence output by measuring high resolution data first using 300 grooves/ mm and later using 1200 grooves/mm gratings. The relative sensitivity obtained from the luminescence intensity ratio method shows values ranging between 0.08 and 0.82%•K −1 at a temperature of 120 K. The relative sensitivity between 1 D 2 (0) → 3 H 4 (0) works best for the present case. The excellent repeatability with minimum uncertainty suggests that there is a definite possibility of using Stark lines for temperature evaluation, and much more effort is required in this direction to establish the procedure for practical use.