Photoluminescence and Scintillation Properties of Ce-doped (MgxCa1−x)HfO3 Single Crystals

Self Cite

Recently, glasses have gained great interest for use as scintillators owing to lots of industrial benefits such as ease of producing customizable shapes and low production cost. Herein, the Er3+-activated BaO–Nb2O5–TeO2 glasses were fabricated for the development of near-infrared (NIR) glass scintillators. The Er3+-activated BaO–Nb2O5–TeO2 glasses exhibited efficient photoluminescence and scintillation that originated from the 4f→4f transition of Er3+. Their quantum yields in photoluminescence were 80% (0.1%Er2O3), 81% (0.5% Er2O3), and 61% (1.0%Er2O3). Further, an almost linear correlation between an X-ray dose rate and NIR scintillation intensity was observed in the 0.5–5000 mGy/h dose rate range. Interestingly, the lowest detectable dose rate limit (0.5 mGy/h) was lower than that of Er-doped Bi4Ge3O12 and Nd-doped GdVO4 single crystals. Further, afterglow levels of the non-doped and Er3+-activated BaO–Nb2O5–TeO2 glasses were about 600 ppm. The observed NIR scintillation properties indicated that the Er3+-activated tellurite glasses should be promising compounds for NIR-emitting scintillators.

Section: Resultsmentioning

confidence: 80%

Scintillation properties of Er³⁺-activated BaO–Nb₂O₅–TeO₂ glasses

Kawano

Okazaki

Takebuchi

et al. 2023

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“…These values were owing to the 5d-4f transitions of Ce 3+ ions. [31][32][33][34][35][36][37] In addition, σ of the Ce:YSO samples were 0.20 (0.1%), 0.39 (0.5%), 0.57 (1.0%), and 0.52 (2.0%), respectively. Since 3σ of the 0.1, 0.5, 1.0, and 2.0% Ce: YSO samples were 0.58, 1.2, 1.7, and 1.6, respectively, the difference of the PL decay time constant was within statistical error.…”

Section: Resultsmentioning

confidence: 95%

Concentration dependence on optical stimulated luminescence properties of Ce: Y₂SiO₅ single crystals

Ichiba,

Takebuchi,

Kato

et al. 2023

Self Cite

In this study, we synthesized Y2SiO5 single crystals having various Ce concentrations by the floating zone method and investigated their photoluminescence (PL) and optically stimulated luminescence (OSL) properties. In PL properties, the Ce-doped samples had an emission band centered at 420 nm, which was due to the 5d-4f transitions of Ce3+ ions. In OSL properties, the OSL spectra showed the emission peaks at 420 nm under stimulation at 520 nm, which was also derived from the 5d-4f transitions of Ce3+ ions. The OSL dose response functions had a lower detection limit of 1 mGy for the 0.5 and 1.0% Ce-doped samples, and 10 mGy for the 0.1 and 2.0% Ce-doped samples. The OSL intensity of the 1.0% Ce-doped sample was approximately 69.3% after 24 hours from X-ray irradiation with respect to immediately after the irradiation.

“…On the other hand, the substitution of a part of the host material, CaHfO 3 by Mg could remove shallow trap levels under the conduction band and would improve afterglow and the LY. 43,44) Hence, evaluating the scintillation properties of Tm:Ca 1−x Mg x HfO 3 single crystal may provide ones that could be applied to integrated detectors.…”

Section: Discussionmentioning

confidence: 99%

Development of Tm-doped CaHfO₃ single-crystal-scintillators for application to integrated-type detectors

Endo,

Ichiba,

Nakauchi

et al. 2024

Photoluminescence and scintillation properties of Tm:CaHfO3 single crystals were investigated. From the results of photoluminescence properties, all the Tm:CaHfO3 samples showed emission bands due to the 4f–4f transitions of Tm3+, and the 1.0% Tm:CaHfO3 sample showed the highest quantum yield among all the samples upon excitation at 360 nm. The afterglow levels at 20 ms after X-ray irradiation for 2 ms were approximately 12,000 ppm. Pulse height spectra using 137Cs as γ-ray source revealed the 1.0% Tm:CaHfO3 sample showed the highest light yield of 1,250 photons/MeV among all the samples.