Takahiko Horiai
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View article: Scintillating and Photoluminescent Ratiometric and Visual Luminescence Thermometry Based on the Ce <sup>3+</sup> -Doped Eutectic Structures
Scintillating and Photoluminescent Ratiometric and Visual Luminescence Thermometry Based on the Ce <sup>3+</sup> -Doped Eutectic Structures Open
A next-generation class of dual-phase, multifunctional photoconversion and thermal sensing materials has been developed using Ce3+-doped YAG-YAP eutectic crystals, synthesized via directional solidification at variable rates (0.1-0.9 mm/mi…
View article: Growth of complex oxide single crystals with high melting point over 2200 °C using tungsten crucible
Growth of complex oxide single crystals with high melting point over 2200 °C using tungsten crucible Open
Complex oxide single crystals with melting points (MPs) above 2200 °C cannot be grown from the melt using iridium (Ir) or platinum (Pt) crucibles due to the MP limitations of these materials. To overcome this, we focused on the tungsten (W…
View article: Unveiling two-dimensional electron systems on ultra-wide bandgap semiconductor $\mathrmβ$-Ga$_2$O$_3$
Unveiling two-dimensional electron systems on ultra-wide bandgap semiconductor $\mathrmβ$-Ga$_2$O$_3$ Open
Ultra-wide bandgap (UWBG) semiconductors promise to revolutionize power electronics, yet a fundamental understanding of their interfacial electronic structure has been hindered by the absence of direct experimental observation. Here, we re…
View article: Correlating Structural Disorder and Pr<sup>3+</sup> Emission Dynamics in Lu<sub>3</sub>Al<sub>2.5–<i>x</i></sub>Sc<sub><i>x</i></sub>Ga<sub>2.5</sub>O<sub>12</sub> Crystals: A Comprehensive Structure–Property Investigation
Correlating Structural Disorder and Pr<sup>3+</sup> Emission Dynamics in Lu<sub>3</sub>Al<sub>2.5–<i>x</i></sub>Sc<sub><i>x</i></sub>Ga<sub>2.5</sub>O<sub>12</sub> Crystals: A Comprehensive Structure–Property Investigation Open
This study explored the influence of Sc3+ ions incorporation on the structural, vibrational, luminescent, and scintillation properties of Pr3+-doped Lu3(Al, Sc)2.5Ga2.5O12 garnet crystals. Addressing the limited research on Sc-admixed and …
View article: Crystal Growth and Energy Transfer Study in Ce3+ and Pr3+ Co-Doped Lu2Si2O7
Crystal Growth and Energy Transfer Study in Ce3+ and Pr3+ Co-Doped Lu2Si2O7 Open
Ce-doped Lu2Si2O7 has a high density, high luminescence efficiency even at high temperatures, and a high effective atomic number, making it a promising candidate for use as a radiation detector in medical devices and resource exploration e…
View article: Crystal growth and temperature dependence of luminescence characteristics of Pr<sup>3+</sup> and Tb<sup>3+</sup> doped solid-solution sesquioxide single crystals
Crystal growth and temperature dependence of luminescence characteristics of Pr<sup>3+</sup> and Tb<sup>3+</sup> doped solid-solution sesquioxide single crystals Open
Pr 3+ - and Tb 3+ -doped (Lu,Y,Sc) 2 O 3 single crystals grown using the micro-pulling-down method show promising performance as optical thermometers, providing a wide operating temperature range and relatively high relative sensitivity.
View article: Shaping scintillation and UV-VIS-NIR luminescence properties through synergistic lattice disordered engineering and exciton-mediated energy transfer in Pr<sup>3+</sup>-doped Lu<sub>1.5</sub>Y<sub>1.5</sub>Al<sub>5−<i>x</i></sub>Sc<sub><i>x</i></sub>O<sub>12</sub> (<i>x</i> = 0.0–2.0) garnets
Shaping scintillation and UV-VIS-NIR luminescence properties through synergistic lattice disordered engineering and exciton-mediated energy transfer in Pr<sup>3+</sup>-doped Lu<sub>1.5</sub>Y<sub>1.5</sub>Al<sub>5−<i>x</i></sub>Sc<sub><i>x</i></sub>O<sub>12</sub> (<i>x</i> = 0.0–2.0) garnets Open
Substituting Sc 3+ for Al 3+ in Pr 3+ -doped Lu 1.5 Y 1.5 Al 5− x Sc x O 12 crystals enhances the Pr 3+ emission across the UV-Vis-NIR spectral range. This enhancement is attributed to an efficient Sc 3+ → Pr 3+ energy transfer and increas…
View article: Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped Tb3Al5−xScxO12 Garnet
Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped Tb3Al5−xScxO12 Garnet Open
Aluminum garnets display exceptional adaptability in incorporating mismatching elements, thereby facilitating the synthesis of novel materials with tailored properties. This study explored Ce3+-doped Tb3Al5−xScxO12 crystals (where x ranges…
View article: Optical and scintillation properties of Pr3+-doped (La, Y)2Si2O7 single crystals
Optical and scintillation properties of Pr3+-doped (La, Y)2Si2O7 single crystals Open
Pr-doped scintillators are attracting attention because of their potential applications in medical devices. In this study, we focused on Pr-doped (La, Y)2Si2O7 scintillators to grow single crystals by the micro-pulling-down method and to e…
View article: Feasibility study of one-dimensional imaging with an optical fiber for radiation dose-rate monitoring system in the decommissioning process
Feasibility study of one-dimensional imaging with an optical fiber for radiation dose-rate monitoring system in the decommissioning process Open
Real-time dose-rate monitoring system under the high dose-rate situation is required for the decommissioning of Fukushima Daiichi Nuclear Plants to remove the debris remaining inside the plants. We have proposed a dose-rate monitor consist…
View article: Fabrication and Properties for Thermal Neutron Detection of 6LiCl/Rb2CeCl5 Eutectic Scintillator
Fabrication and Properties for Thermal Neutron Detection of 6LiCl/Rb2CeCl5 Eutectic Scintillator Open
The 3He gas is commonly used for the detection of thermal neutrons. However, with the depletion of 3He gas, there is a need to develop new solid scintillators for thermal neutron detection. Solid scintillators containing 6Li, which have la…
View article: Development of calculation model for designing temperature characteristics of double-layered thickness-shear resonator
Development of calculation model for designing temperature characteristics of double-layered thickness-shear resonator Open
A calculation model for predicting the temperature characteristics of the double-layered resonator (DRL) was developed by using the total strain ratio including the influence of the waves reflected at the bonding boundary. The validity of …
View article: Crystal growth, luminescence, and scintillation properties of Er-doped La<sub>2</sub>Hf<sub>2</sub>O<sub>7</sub> single crystal
Crystal growth, luminescence, and scintillation properties of Er-doped La<sub>2</sub>Hf<sub>2</sub>O<sub>7</sub> single crystal Open
The growth of Er-doped La 2 Hf 2 O 7 (LHO:Er) single crystals with a high mp of 2413 °C was achieved by the melt-growth method using a tungsten (W) crucible. Polished LHO:Er specimens were obtained from the as-grown crystals. The full widt…
View article: Crucible-Free Growth of Bulk b-Ga2O3 Single-Crystal Scintillator under Oxidizing Atmosphere
Crucible-Free Growth of Bulk b-Ga2O3 Single-Crystal Scintillator under Oxidizing Atmosphere Open
β-Ga2O3 is a well-known semiconductor material for power devices and other applications. Recently, β-Ga2O3 has also been reported as a scintillator material with a light yield of approximately 8400 ph./MeV, scintillation decay time of <1 μ…
View article: Crucible Free Growth of Bulk B-Ga<sub>2</sub>O<sub>3</sub> Single Crystal Scintillator Under Oxidizing Atmosphere
Crucible Free Growth of Bulk B-Ga<sub>2</sub>O<sub>3</sub> Single Crystal Scintillator Under Oxidizing Atmosphere Open
β-Ga2O3 is a well-known semiconductor material for power devices and other applications. Recently, β-Ga2O3 has also been reported as a scintillator material with a light yield of approximately 8400 ph./MeV, scintillation decay time of &…
View article: Development and x-ray imaging performance of Tb-doped GdAlO3-<i>α</i>Al2O3 submicron-diameter phase-separated scintillator fibers
Development and x-ray imaging performance of Tb-doped GdAlO3-<i>α</i>Al2O3 submicron-diameter phase-separated scintillator fibers Open
Scintillators are key components in high-energy x-ray detectors for x-ray computed tomography, which are applied in medical diagnosis, nondestructive testing, and security inspection. Scintillators in x-ray imaging are required to have bot…
View article: Fabrication and scintillation properties of a flexible optical-guiding crystal scintillator
Fabrication and scintillation properties of a flexible optical-guiding crystal scintillator Open
Scintillation properties of a flexible optical-guiding crystal scintillator with a thallium-doped CsI (Tl:CsI) crystal and borosilicate glass as the core and cladding, respectively, are reported. The as-fabricated optical-guiding crystal s…
View article: Fabrication and Characterization of K2CeCl5/6LiCl and CeCl3/SrCl2/6LiCl Eutectics for Thermal Neutron Detection
Fabrication and Characterization of K2CeCl5/6LiCl and CeCl3/SrCl2/6LiCl Eutectics for Thermal Neutron Detection Open
In recent years, thermal neutron detection using scintillators has been used in a wide range of fields. Thus, the development of scintillators with a higher light yield, faster decay, and higher sensitivity for thermal neutrons is required…
View article: Fabrication of CeCl3/LiCl/CaCl2 Ternary Eutectic Scintillator for Thermal Neutron Detection
Fabrication of CeCl3/LiCl/CaCl2 Ternary Eutectic Scintillator for Thermal Neutron Detection Open
To date, 3He gas has been commonly used to detect thermal neutrons because of their high chemical stability and low sensitivity to γ-rays, owing to their low density and large neutron capture cross-section. However, the depletion of 3He ga…