2025/08/12 by М. Н. Попова, Popova, M. N., M. Diab +9
Chemistry · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Inorganic Fluorides and Related Compounds #Luminescence Properties of Advanced Materials #Materials Science (cond-mat.mtrl-sci) #Optics (physics.optics) #Radiation Detection and Scintillator Technologies
paper · pdf · doi:10.48550/arxiv.2508.08858
openalex publication_date 2025/08/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We carried out high-resolution (0.02 cm-1) measurements of the photoluminescence (PL) spectra of CaWO4:Ho3+, including in magnetic field, and performed spectra modeling. Well-resolved hyperfine structure was observed in the luminescence spectra of CaWO4:Ho3+ for the first time. Energies of several crystal-field levels were specified, g-factors were determined. Variations of a magnetic field as small as several tenths of mT can be detected from the PL spectra. We show that the PL spectra are much more sensitive to lattice strains in CaWO4:Ho3+ than the absorption spectra. The spectra were simulated using refined crystal-field parameters and taking into account both hyperfine and deformation interactions. Here, we used the previously obtained distribution function of random strains induced by point lattice defects in an elastically anisotropic CaWO4 crystal. A luminescence thermometer for temperatures around 20 K based on CaWO4:Ho3+ is suggested.