PHOTOLUMINESCENCE OF LiKSO4 ACTIVATED BY TL+ IONS

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Rare Earth Activated Oxyfluoride Glasses and Glass-Ceramics for Scintillation Applications

Oxyfluoride glasses 49SiO2-6Al2O3-24Li2O-20LaF3 activated with Tb, Ce, Eu have been synthesized and studied. After heating at 580C and 750C crystalline phases were obtained. The samples were studied by DTA (Differential thermal analyzer), CL (cathodoluminescence), XRD (X—ray diffraction), SEM (scanning electron microscope), EDS (energy dispersive x-ray spectroscopy) methods. We found out that presence of crystalline phase enhances the CL of Tb activated samples significantly; whereas, the shortest decay time of 0.29 mks has been observed for less intense Ce doped glass sample

EPR, optical and thermometric studies of Cr3+ ions in the α-Al2O3 synthetic single crystal

The optical spectra of a single crystal of α-Al2O3Cr3+ were studied in a wide temperature range. The crystal was demonstrated to have a potential for optical thermometric applications. Three ways of measuring temperature were tested and analyzed: i) luminescence intensity ratio of the R1 and R2 lines; ii) change of the full width of half maxima of the R1 and R2 lines, and iii) thermal shifts of the R1 and R2 lines maxima. The highest absolute and relative sensitivities were obtained at cryogenic temperatures. In addition, the thermal shifts of the R lines were analyzed using the McCumber-Sturge equation to estimate the Debye temperature and the electron-vibrational interaction parameter