Dopant concentration dependence on optical and scintillation properties of Eu-doped Gd3Al2Ga3O12 single crystals

Kunikata, Toshiaki; Watanabe, Kenichi; Kantuptim, Prom; Ichiba, Kensei; Shiratori, Daiki; Kato, Takumi; Nakauchi, Daisuke; Kawaguchi, Noriaki; Yanagida, Takayuki

doi:10.35848/1347-4065/acfb16

Jpn. J. Appl. Phys.

2023

DOI: 10.35848/1347-4065/acfb16

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Dopant concentration dependence on optical and scintillation properties of Eu-doped Gd₃Al₂Ga₃O₁₂ single crystals

Toshiaki Kunikata,

Kenichi Watanabe,

Prom Kantuptim

et al.

Abstract: We have studied scintillation properties of Eu3+-doped Gd3Al2Ga3O12 single crystals. Gd3Al2Ga3O12 single crystals with different concentrations of Eu3+ (0.5, 1.0, 5.0, 10.0, and 15.0 %) were grown using the floating-zone method. In photoluminescence (PL) and scintillation properties, the Eu-doped Gd3Al2Ga3O12 single crystals showed emission peaks and several millisecond decay times due to 4f-4f transitions of Eu3+ ions. Pulse height spectra of all the samples were investigated under γ-ray irradiation from 137C… Show more

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2024

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Cited by 3 publications

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Evaluation of photoluminescence and scintillation properties of Eu-doped YVO4 single crystals synthesized by optical floating zone method

Ichiba,

Kato,

Watanabe

et al. 2024

Journal of Luminescence

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Evaluation of photoluminescence and scintillation properties of Eu-doped YVO4 single crystals synthesized by optical floating zone method

Ichiba,

Kato,

Watanabe

et al. 2024

Journal of Luminescence

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Comparative Validation of Scintillator Materials for X-Ray-Mediated Neuronal Control in the Deep Brain

Hildebrandt,

Koshimizu,

Asada

et al. 2024

IJMS

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When exposed to X-rays, scintillators emit visible luminescence. X-ray-mediated optogenetics employs scintillators for remotely activating light-sensitive proteins in biological tissue through X-ray irradiation. This approach offers advantages over traditional optogenetics, allowing for deeper tissue penetration and wireless control. Here, we assessed the short-term safety and efficacy of candidate scintillator materials for neuronal control. Our analyses revealed that lead-free halide scintillators, such as Cs3Cu2I5, exhibited significant cytotoxicity within 24 h and induced neuroinflammatory effects when injected into the mouse brain. In contrast, cerium-doped gadolinium aluminum gallium garnet (Ce:GAGG) nanoparticles showed no detectable cytotoxicity within the same period, and injection into the mouse brain did not lead to observable neuroinflammation over four weeks. Electrophysiological recordings in the cerebral cortex of awake mice showed that X-ray-induced radioluminescence from Ce:GAGG nanoparticles reliably activated 45% of the neuronal population surrounding the implanted particles, a significantly higher activation rate than europium-doped GAGG (Eu:GAGG) microparticles, which activated only 10% of neurons. Furthermore, we established the cell-type specificity of this technique by using Ce:GAGG nanoparticles to selectively stimulate midbrain dopamine neurons. This technique was applied to freely behaving mice, allowing for wireless modulation of place preference behavior mediated by midbrain dopamine neurons. These findings highlight the unique suitability of Ce:GAGG nanoparticles for X-ray-mediated optogenetics. The deep tissue penetration, short-term safety, wireless neuronal control, and cell-type specificity of this system offer exciting possibilities for diverse neuroscience applications and therapeutic interventions.

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Preparation of Ce-Doped Gd3(Al, Ga)5O12 Nanopowders via Microwave-Assisted Homogenization Precipitation for Transparent Ceramic Scintillators

Liu,

Zhang,

et al. 2024

Materials

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Ce-doped gadolinium gallium aluminum oxide (Ce: GGAG) precursors were first prepared by the microwave-assisted homogeneous precipitation method (MAHP). Thermal gravity-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), specific surface area analysis (BET) and field emission scanning electron microscopy (FE-SEM) were employed to investigate the crystal structure, phase evolution and morphologies of the Ce: GGAG precursors and powders. The influence of Ga ion concentration in the salt solution on the properties of Ce: GGAG powders was investigated. All the precursors were transformed into single-phase GGAG after being calcined at 950 °C in a furnace for 3 h. Monodispersed Ce: GGAG powders were obtained as the Ga ion concentration was lower than 0.06 mol/L. Single-phase and dense Ce: GGAG ceramics were obtained after sintering at 1600 °C in a flowing oxygen atmosphere for 10 h. Specifically, the Ce: GGAG ceramic reached its maximum density of ~6.68 g/cm3, which was close to its theoretical density of 6.70 g/cm3, and exhibited the highest optical transmittance of 65.2% at 800 nm after hot isostatic pressing sintering (HIP) as the Ga ion concentration was 0.02 mol/L. The decay time and light yield of the GGAG ceramic were 35 ns and 35,000 ± 1250 ph/MeV, respectively, suggesting that Ce: GGAG ceramics prepared using MAHP-synthesized nanopowders are promising for scintillation applications.

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Dopant concentration dependence on optical and scintillation properties of Eu-doped Gd₃Al₂Ga₃O₁₂ single crystals

Cited by 3 publications

References 51 publications

Evaluation of photoluminescence and scintillation properties of Eu-doped YVO4 single crystals synthesized by optical floating zone method

Evaluation of photoluminescence and scintillation properties of Eu-doped YVO4 single crystals synthesized by optical floating zone method

Comparative Validation of Scintillator Materials for X-Ray-Mediated Neuronal Control in the Deep Brain

Preparation of Ce-Doped Gd3(Al, Ga)5O12 Nanopowders via Microwave-Assisted Homogenization Precipitation for Transparent Ceramic Scintillators

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