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Scintillation properties of GdAlO3 single crystals doped with Nd
M. Akatsuka,N. Kawaguchi,T. Yanagida 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
Nd-doped GdAlO3 single crystals were synthesized by the floating-zone method to evaluate their scintillation properties,particularly in the near-infrared (NIR) range. Under X-ray irradiation, scintillation due to the 4F3/2→4I11/2 transition of Nd3+was observed at 1064 nm. By changing the irradiation dose from 1 mGy-10Gy, we evaluated the relation between thescintillation intensity and the X-ray dose, and some samples showed good linearity. The scintillation decay time ranged 66-241μs due to Nd3+.
Effect to optical properties by changing the Al2O3 ratio in K2O-Al2O3-P2O5 glasses
D. Shiratori,Y. Isokawa,H. Samizo,M. Koshimizu,N. Kawaguchi,T. Yanagida 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
In this study, we prepared glasses with the composition of 0.1% Ce-doped (100−x) KPO3-xAl2O3 and investigated luminescent characteristics. The glass samples with different Al2O3 ratio (x = 5, 10, 15, 20, 25, 30 and 40) were synthesized by the melt quenching method. The All samples had high transmittance (80−90%) at wavelengths longer than 350 nm except for x = 40, and by increasing the Al2O3 ratio, the transmittance of the samples was improved. From the measurements of photoluminescence (PL) decay curve, the luminescence decay time was confirmed to be typical for the 5d−4f transition of Ce3+ (~30 ns). The samples showed thermally-stimulated luminescence (TSL), and the sensitivity of dose response was confirmed to be linear in the dose range from 0.01 mGy to 1 Gy for the x = 25 and 30 samples which showed the highest sensitivity among the present samples. The scintillation spectra show the broad luminescence around 300−500 nm, and these emission intensities were increased by increasing the Al2O3 ratio.