Pr-doped gadolinium pyrosilicate, which had a composition of Gd 2 Si 2 O 7 , was synthesized by the floating zone method with different Pr concentrations from 0.1 to 2.0 mol%. After confirming the crystal phase by X-ray diffraction analysis, photoluminescence (PL) and scintillation properties were investigated. PL emission spectra showed a broad emission peak at 340-360 nm due to Pr 3+ 5d-4f transition, and decay times were around 9-12 ns. In X-ray-induced scintillation spectra, we confirmed a similar spectral shape with PL, and scintillation decay times were around 18-29 ns. In the 137 Cs γ-ray-irradiated pulse height measurement, the 1.0% Pr-doped sample had shown the highest scintillation light yield of 2290 ph/MeV among the present samples. In the same setup, we also used different γ-ray sources to check the energy response linearity. Finally, energy resolution as a function of γ-ray energy was investigated.
Lanthanum and lutetium pyrosilicate (La 2 Si 2 O 7 and Lu 2 Si 2 O 7 , respectively) single crystals with a Tm doping concentration of 2.0% were successfully synthesized by the floating-zone method. X-ray diffraction patterns showed a single phase in each compound without the impurity phase. Both their photoluminescence (PL) and scintillation properties were systematically determined in this study, including PL emission, PL decay time, X-ray-induced scintillation spectra, X-ray-induced scintillation decay time, afterglow level, and pulse height spectra. The emission from Tm 3+ 4f-4f transition was observed on both samples as shown by PL emission as well as X-ray-induced scintillation spectra. Under 137 Cs 662 keV γ-ray irradiation, their scintillation light yields were 2340 ph/MeV for Tm-doped Lu 2 Si 2 O 7 and 1440 ph/MeV for Tm-doped La 2 Si 2 O 7 .
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