The University of Osaka · Materials Science
Professor Marilou Cadatal‐Raduban's research lab specializes in the development and characterization of advanced functional materials for ultraviolet and vacuum ultraviolet (VUV) applications. Key research directions include the design and synthesis of rare-earth-doped fluoride scintillators—particularly Nd³⁺:LaF₃ and Nd³⁺:(La₁₋ₓBaₓ)F₃—optimized for fast response, high transparency, and efficient VUV emission. The lab also focuses on photoconductive detectors based on titanium dioxide (TiO₂) thin films for UV-C sensing, investigating the influence of film thickness, crystallinity, and substrate on photoresponsivity. Additionally, the group employs first-principles density functional theory (DFT) to explore the electronic, optical, and thermoelectric properties of two-dimensional materials such as MXenes (e.g., Mo₂C-MXenes) for next-generation optoelectronic and energy conversion devices.
Figures are computed from collected data and may differ slightly.
Nd3+:(La1-xBax)F3-x (x = 0.1) efficiently grown by the micro-pulling down method is explored. Transparency down to 164 nm and broad fluorescence centered at 175 nm make it a novel vacuum ultraviolet scintillator and a potential tunable laser material with the capability of short pulse amplification.
Nd3+:(La1−x,Bax)F3−x(x=0.1) is efficiently grown by the micro-pulling-down method. Characterization of its optical properties reveals that it is transparent in the vacuum ultraviolet region with an absorption edge at around 180 nm. It has fluorescence centered at 175 nm with a bandwidth of 12 nm and a lifetime of 6.1 ns as measured by a vacuum ultraviolet streak camera and spectrometer combination. It is proposed to be suitable as a vacuum ultraviolet scintillator and a potential laser material.
Vacuum ultraviolet radiation (VUV, from 100 nm to 200 nm wavelength) is indispensable in many applications, but its detection is still challenging. We report the development of a VUV photoconductive detector, based on titanium dioxide (TiO<sub>2</sub>) nanoparticle thin films. The effect of crystallinity, optical quality, and crystallite size due to film thickness (80 nm, 500 nm, 1000 nm) and type of substrate (silicon Si, quartz SiO<sub>2</sub>, soda lime glass SLG) was investigated to explore
We report on fabricated titanium dioxide (TiO<sub>2</sub>) thin films along with a transimpedance amplifier (TIA) test setup as a photoconductivity detector (sensor) in the ultraviolet-C (UV-C) wavelength region, particularly at 260 nm. TiO<sub>2</sub> thin films deposited on high-resistivity undoped silicon-substrate at thicknesses of 100, 500, and 1000 nm exhibited photoresponsivities of 81.6, 55.6, and 19.6 mA/W, respectively, at 30 V bias voltage. Despite improvements in the crystallinity of
Abstract We report the potential of lanthanum fluoride (LaF 3 ) as a fast-response scintillator. When excited by an extreme ultraviolet free electron laser, neodymium-doped LaF 3 (Nd 3+ :LaF 3 ) exhibited a 1.9 ns fast decay component and a 6.7 ns slow decay component for its 172 nm emission peak. The slow decay component is due to interconfigurational 4f 2 5d-4f 3 transition in Nd 3+ . First principles density functional theory calculations using the Perdew–Burke–Ernzerhof hybrid functional inc
We investigate the structural, electronic, optical, and thermoelectric properties of three compositions of Mo2C-MXenes (Mo2CF2, Mo2C(OH)2, and Mo2CO2) from monolayer to multilayer by first principles calculation within Density Functional Theory (DFT) and Boltzmann transport theory. Firstly, the atomic structures of Mo2C-MXenes are optimized, and their respective structures are created with comparative research. Secondly, their electronic band structures and optical properties are studied in deta
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