RESEARCH TOPICS
We mainly focus on the basic research of the properties of solid state materials with the assistance
of the quantum theory. Especially, influence of the defects or dopants on the properties of solid materials
is studied with the aid of experimental and computational techniques.
Recent Topics
- Organic-inorganic hybrid perovskite solar cell
- Rare-earth free phosphors
- Upconversion phosphors
- Dilute magnetic materials
- Materials Informatics
- Electrical Breakdown
- Chrge-up effect due to X-ray irradiation
- Biomaterials
RECENT PUBLICATIONS
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Mekhrdod S. Kurboniyon, Alok M. Srivastava, Bibo Lou, Dilshod D. Nematov, Amondulloi Burhonzoda, Tomoyuki Yamamoto, Chong-Geng Ma, and Mikhail G. Brik
Thermal Quenching Mechanism of Mn4+ in Na2SiF6, NaKSiF6, and K2SiF6 Phosphors: Insights from the First-Principles Analysis
Inorg. Chem. 63 (2924) 21212-21221.
https://doi.org/10.1021/acs.inorgchem.4c03589
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Zafari Umar, Oleg Khyzhun, Mekhrdod S. Kurboniyon, Tomoyuki Yamamoto, Mikhail G. Brik, Mega Novita, Justyna Barzowska, and Michal Piasecki
The Effect of Hydrostatic Pressure on Structure, Crystal-Field Strength, and Emission Properties of Neat and Ni2+-Activated KMgF3
Adv. Theory Simul. (2024) 202400734
https://doi.org/10.1002/adts.202400734
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Maksym Buryi, Vladimir Babin, Katerina Decka, Katarina Ridzonova, Neda Neykova, Frantisek Hajek, Zhivko Velkov, Zdenek Remes, Robert Tomala, Pawel Socha, Karol Bartosiewicz, Tomas Hostinsky, Petr Mosner, Tomoyuki Yamamoto, Chong-Geng Ma, Mikhail G. Brik
Charge trapping and luminescence of the mixed size CsPbBr3 particles grown in one batch
Opt. Mater. 151 (2024) 115279
https://doi.org/10.1016/j.optmat.2024.115279
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Zafari Umar, Oleg Khyzhun, Tomoyuki Yamamoto, Piotr Bragiel
Ab initio calculations of two-site occupation for substituting ions in MgTa2O6:Cr3+ phosphor: The geometric and electronic structures and optical transition energies
Opt. Mater. 140 (2024) 115057
https://doi.org/10.1016/j.optmat.2024.115057
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Kazuma Midorikawa, Sachiko Hiromoto, Tomoyuki Yamamoto
Carbonate content control in carbonate apatite coatings of biodegradable magnesium
Ceramics International 50 (2024) 6784-6792
https://doi.org/10.1016/j.ceramint.2023.12.021
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First-Principles Calculations of the Electronic Structure and Mechanical Properties of Non-Doped and Cr3+-Doped K2LiAlF6 Under Pressure
Z. Umar, M. S. Kurboniyon, O. Khyzhun, T. Yamamoto, C.-G. Ma, M. G. Brik, M. Piasecki
J. Lumin. 266 (2024) 120278
https://doi.org/10.1016/j.jlumin.2023.120278
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A New Data Transformation and Resampling Approach for Prediction of Yield Strength of High-Entropy Alloys
N. H. Chau, G. Sato, K. Utsugi, T. Yamamoto
Proceedings of 15th Asian Conference of Intelligent Information and Database Systems, ACIIDS 2023. Lecture Notes in Computer Science, vol 13996. Springer, Singapore
https://doi.org/10.1007/978-981-99-5837-5_1
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First-principles study of geometric and electronic structures, and optical transition energies of Mn4+ impurity ions: K2SiF6 as a prototype
M. S. Kurboniyon, B. Lou, U. Zafari, F. Rahimi, A. M. Srivastava, T. Yamamoto, M. G. Brik, C-G. Ma
J. Lumin. 263 (2023) 120103
https://doi.org/10.1016/j.jlumin.2023.120103
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First-principles investigation of divalent ion sensing with cesium lead trihalides
T. Yamamoto, R. Oonaga, H.C. Nguyen, V.H. Vuong, A.T. Nguyen, D.T. Bui, N.N. Hoang, N.D. Nguyen
Opt. Mater.: X 19 (2023) 100253
https://doi.org/10.1016/j.omx.2023.100253
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Geometrical and electronic structure analysis of Mn-doped CaMO3 (M = Ti, Zr and Sn)
M. S. Kurboniyon, U. Zafari, C.-G. Ma, M. Piasecki, M. G. Brik, T. Yamamoto
Phys. Status Solidi B 260 (2023) 2200575
https://doi.org/10.1002/pssb.202200575
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Influence of co-doping of divalent ions on the photoluminescence intensity of Mn4+ doped CaAl12O19
U. Zafari, M. Sagayama, M. Subhoni A. M. Srivastava, W. W. Beers, W. Cohen, C.-G. Ma, M. Piasecki, M. G. Brik, T. Yamamoto
Opt. Mater.: X 16 (2022) 100197.
https://doi.org/10.1016/j.omx.2022.100197
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Support Vector Machine-Based Phase Prediction of Multi-principal Element Alloys
H.C. Nguyen, M. Kubo, V. H. Le, and T. Yamamoto
Vietnam J. Comp. Sci. (2022)
https://dx.doi.org/10.1142/S2196888822500312
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Influence of Isostatic Pressure on the Elastic and Electronic Properties of K2SiF6:Mn4+
M. Subhoni U. Zafari, C.-G. Ma, A. M. Srivastava, W. W. Beers, W. Cohen, M. G. Brik, M. Piasecki, T. Yamamoto
Materials 15 (2022) 613.
https://doi.org/10.3390/ma15020613
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Theoretical and Experimental Investigations of Mn4+ Site Occupation in CaAl12O19
M. Sagayama, M. Subhoni U. Zafari, A. M. Srivastava, W. W. Beers, W. Cohen, M. G. Brik, T. Yamamoto
ECS J. Solid State Sci. Tech. 10 (2021) 076004.
http://dx.doi.org/10.1149/2162-8777/ac13df
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Evaluation of Damage Coefficient for Minority-Carrier Diffusion Length of Triple-Cation Perovskite Solar Cells under 1-MeV Electron Irradiation for Space Applications
Y. Miyazawa, G. Kim, A. Ishii, M. Ikegami, T. Miyasaka, Y. Suzuki, T. Yamamoto, T. Ohshima, S. Kanaya, H. Toyota, K. Hirose
J. Phys. Chem. C 125 (2021) 13131-13137.
http://dx.doi.org/10.1021/acs.jpcc.1c01590
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Origin of room-temperature ferromagnetism in Co-doped CeO2
K. Tarui, T. Oomori, Y. Ito, and T. Yamamoto
Physica B 619 (2021) 413158.
https://doi.org/10.1016/j.physb.2021.413158
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First principles analysis of crystal structure, electronic and optical properties of CsSnI3-xBrx perovskite for photoelectric applications
D. D. Nematov, A. S. Burhonzoda, M. A. Khusenov, Kh. T. Kholmurodov, and T. Yamamoto
J. Surf. Investigation: X-ray, Synchrotron and Neutron Techniques 15 (2021) 532-536.
http://dx.doi.org/10.1134/S1027451021030149
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Unusual hydrogen implanted gold with lattice contraction at increased hydrogen content
K. T. Nguyen, V. H. Vuong, T. N. Nguyen, T. T. Nguyen, T. Yamamoto, N. N. Hoang
Nature Comm. 12 (2021) 1560.
http://dx.doi.org/10.1038/s41467-021-21842-9
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First-principles investigations of geometrical and electronic structures of Mn4+ doped A2SiF6 (A= K, Rb, Cs) red phosphors
M. Subhoni, U. Zafari, A. M. Srivastava, W. W. Beers, W. Cohen, M. G. Brik, and T. Yamamoto
Opt. Mat. 115 (2021) 110986.
http://dx.doi.org/10.1016/j.optmat.2021.110986
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Recent progress in nanostructured functional materials and their applications
T. Yamamoto, M. Yoshiya, and N.N. Hoang
Mater. Trans. 61 (2020) 2435-2441.
http://dx.doi.org/10.1016/j.actamat.2020.04.048
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Proton Irradiation Tolerance of High-Efficiency Perovskite Absorbers for Space Applications
S. Kanaya, G-M Kim, M. Ikegami, T. Miyasaka, K. Suzuki, Y. Miyazawa, H. Toyota, K. Osonoe, T. Yamamoto, and K. Hirose
J. Phys. Chem. Lett. 10 (2019) 6990-6995
http://dx.doi.org/10.1021/acs.jpclett.9b02665
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Universal topological representation of geometric patterns
S. Ohmori, Y. Yamazaki, T. Yamamoto, and A. Kitada
Physica Scripta 94 (2019) 105213
http://dx.doi.org/10.1088/1402-4896/ab2946
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Theoretical investigation of the breakdown electric field of SiC polymorphs
K. Yamaguchi, D. Kobayashi, T. Yamamoto, and K. Hirose
Physica B532 (2018) 99-102
http://dx.doi.org/10.1016/j.physb.2017.03.042
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Degradation of CH3NH3PbI3 provskite due to soft X-ray irradiation as analyzed by an X-ray photoelectron spectroscopy time-dependent measurement method
K. Motoki, Y. Miyazawa, D. Kobayashi, M. Ikegami, T. Miyasaka, T. Yamamoto, and K. Hirose
J. Appl. Phys. 121 (2017) 085501
http://dx.doi.org/10.1063/1.4977238
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A valence state evaluation of a positive electrode material in an Li-ion battery
with first principles K- and L-edge XANES spectral simulations and resonance photoelectron spectroscopy
K. Kubobuchi, M. Mogi, M. Matsumoto, T. Baba, C. Yogi, C. Sato, T. Yamamoto, T. Mizoguchi and H. Imai
J. Appl. Phys. 120 (2016) 142125
http://dx.doi.org/10.1063/1.4963379
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Local environment analysis of Fe ions in BaMgSiO4
J. Kase, S. Shingaki, Y. Inaba, K. Meguro, H. Murata, T. Okajima and T. Yamamoto
AIP-Conference Proceedings 1763, 050007 (2016)
https://doi.org/10.1063/1.4961360
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Existence of a polycrystal filled with an arbitrary finite number of self-similar crystals
A. Kitada, S. Ohmori and T. Yamamoto
J. Phys. Soc. Jpn. 85, 045001 (2016)
http://dx.doi.org/10.7566/JPSJ.85.045001
COLLABORATING RESEARCHERS
- Prof. Kazuyuki HIROSE, ISAS/JAXA, Japan - SiO2/Si interface, Electrical breakdown, solar cell
- Prof. Kazuhiko KAWABATA, Kwansei Gakuin Univ. - Bioceramics
- Prof. Mikhail G. BRIK, Tartu Univ., Estonia - Optical materials
- Prof. Nam-Nhat HOANG, VNU-UET, Vietnam - Functional materials
- Prof. Hai-Chau NGUYEN, VNU-UET, Vietnam - Materials informatics
- Prof. Fabio PICHIERRI, Tohoku Univ., Japan - Organic-inorganic hybrid materials
- Prof. Akiko SEKINE. Tokyo Inst. Tech. Japan - Molecular crystals
- Prof. Kholmirzo T. KHOLMURODOV, JINR, Russia - Molecular dynamics simulations for functional materials
- Prof. Tsutomu MIYASAKA, Toin Univ. Yokohama, Japan - Organic-inorganic hybrid perovskite solar cell
- Prof. Masashi IKEGAMI, Toin Univ. Yokohama, Japan - Organic-inorganic hybrid perovskite solar cell
- Prof. Tsuyoshi YOSHIOKA, Teikyo Heisei Univ., Japan - Applied mathematical science
- Dr. Mekhrdod SUBHONI, Academy of Sciences of Republic of Tajikistan, Tajikistan - Rare-earth free phosphor
- Mr. Umar ZAFARI, Academy of Sciences of Republic of Tajikistan, Tajikistan - Rare-earth free phosphor
- Dr. Khaiyom RAHMONOV, Academy of Sciences of Republic of Tajikistan, Tajikistan - Organic-inorganic hybrid perovskite solar cell
- Dr. Mirzoaziz KHUSENOV, Tajik Technical Univ., Tajikistan - Organic-inorganic hybrid perovskite solar cell
EQUIPMENTS (SELECTED)
- Furnace (Box type: 3, tube type: 2)
- RF Magnetron Sputtering equipment
- Drafter
- Powder X-ray Diffractometer (XRD)
- X-ray Photoelectron Spectrometer(XPS)
- UV-Vis Spectrometer
- Photoluminescence Spectrometer
- Cluster Computers