LSO and YSO crystals were grown by the Czochralski method in the Institute for Scintillation Materials, Kharkiv, Ukraine from raw materials of 4 N and 5 N purity, respectively. For the luminescent investigation, optically-graded samples with dimensions of 3×5×0.5 mm3 were prepared.
The emission and excitation spectra were measured both in the integral regime, and in time gates of 1.2–10 ns and 50–100 ns (called as the fast and slow components, respectively) in the limits of SR pulse with a repetition time of 100 ns and a duration of 0.127 ns. The excitation spectra were corrected for the spectral dependence of transmittance of Al-grating and intensity of SR beam; the emission spectra were not corrected. Using SR excitation, the decay kinetics of the luminescence was measured in the 1.2–100 ns time range.