Scintillation Properties of Pr-Doped Lanthanum Pyrosilicate Single Crystals

Abstract

Five samples of lanthanum pyrosilicate (La2Si2O7) single crystals with 0.5–10.0% Praseodymium (Pr)-doping concentrations were synthesized by the floating-zone method. Photoluminescence and scintillation properties of these crystals were investigated in this study for the first time. The multiple emissions from electron transitions of Pr3+ were observed on both a photoluminescence emission map and scintillation spectra, including the desired emission band of Pr3+ 5d–4f transition at 250–310 nm. The major photoluminescence and scintillation decay times were approximately 19 and 26 ns, respectively. When compared with commercial scintillators such as Tl-doped cesium iodide (CsI), the Pr-doped La2Si2O7 samples presented a respectively low afterglow level of 32 ppm after 20 ms of X-ray irradiation. Under 662 keV γ-ray irradiation from 137Cs, the 3.0% Pr-doped La2Si2O7 sample presented a scintillation light yield of 3200 ph/MeV, which was the best value among the tested samples.

Photoluminescence and scintillation properties of Pr-doped (Lu, Y)2Si2O7 crystals

“…It could be considered that the large excitation density of X-rays effectively induced nonradiative relaxation processes owing to interactions upon numerous excited electrons. 51) The slow components (200-240 ns) were almost the same values as that confirmed in some REPS; 30,44) thus, it would be attributed to the recombination of STE. The wavelength sensitivity of the used photomultiplier tube at the emission wavelength of 4f-4f transitions nm) was quite low.…”

“…They were 27-40 ns and typical values as 5d-4f transitions of Pr 3+ . [43][44][45] When compared with decay times of Pr-doped LPS and YPS, the obtained values were slightly slow. The tendency would be reasonable because decay times were proportional to QY, 46) whose values were higher than those of the LPS and YPS.…”

Scintillation properties of transparent Lu‐α‐SiAlON:Ce3+ ceramics

“…Table 1 lists the obtained fitting parameters. The third term was derived from the instrument response function, 32 that is to say, the developed transparent Lu‐α‐SiAlON:Ce 3+ ceramics have two decay components. Whereas no reports have been made for decay time of Ce‐doped α‐SiAlON, considering that decay time of general scintillation materials with Ce 3+ as emission center is several tens ns, 33–38 the faster one $$( {\ {{\tau }_1} = \ 48\ {\mathrm{ns}}} )$$ should be derived from 5f‐4d transition from Ce 3+ .…”

Radiation resistance of praseodymium-doped aluminum lithium fluorophosphate scintillator glasses for laser fusion experiments

“…On the other hand, the 9.0 ns decay constants of the Pr 3+ -doped APLF glasses are faster than the ones obtained from similar glasses (∼19.6 ns) under optical excitation. 7,8) Under X-ray excitation, the APLF glass UV emission decay constants are also faster compared to other Pr 3+ -doped glasses and crystals such as 20La 2 O 3 −30Al 2 O 3 -50B 2 O 3 (LAB, 15 ns), 43) CaSiO 3 (20 ns), 44) Gd 2 Si 2 O 7 (GPS, 18-29 ns), 45) La 2 Si 2 O 7 (LaPS, 25-27 ns), 46) and SrLu 2 O 4 (14 ns). 47) It should be noted further that no additional slow component is observed on the γ-ray-irradiated glass as compared to its non-irradiated counterpart, i.e.…”