Details of the Researcher

PHOTO

Takuya Hasegawa
Section
Institute of Multidisciplinary Research for Advanced Materials
Job title
Associate Professor
Degree

  • 博士（工学）（新潟大学）

  • 修士（工学）（新潟大学）

e-Rad No.
30793690

Research History 4

  • 2025/04 - Present
    Tohoku University　Institute of Multidisciplinary Research for Advanced Materials

  • 2022/10 - 2025/03
    Tohoku University　Institute of Multidisciplinary Research for Advanced Materials

  • 2019/10 - 2022/09
    Tohoku University　Institute of Multidisciplinary Research for Advanced Materials Division of Inorganic Material Research

  • 2016/10 - 2019/09
    Kochi University

Education 3

  • Niigata University　Graduate School of Science and Technology

    2014/10 - 2016/09

  • Niigata University　Graduate School of Science and Technology

    2012/04 - 2014/03

  • Niigata University　Faculty of Engineering　Department of Chemistry and Chemical Engineering

    2008/04 - 2012/03

Committee Memberships 10

  • 日本セラミックス協会　行事企画委員（東北北海道支部選出）

    2024/04 - Present

  • 日本セラミックス協会秋季シンポジウム　フォトセラミックス セッションオーガナイザー

    2023/09 - Present

  • 映像情報メディア学会情報ディスプレイ研究委員会　幹事

    2019/05 - Present

  • 日本化学会東北支部　監査

    2025/03 - 2026/02

  • 日本化学会東北支部　令和6年度幹事長

    2023/03 - 2025/02

  • 映像情報メディア学会情報ディスプレイ研究委員会　幹事補佐

    2017/05 - 2019/04

  • 公益社団法人 日本化学会 コロイドおよび界面化学部会　第75回コロイドおよび界面化学討論会 実行委員

    2024/09 -

  • 日本化学会東北支部　令和 6 年度 化学系学協会東北大会 実行委員

    2024/09 -

  • The 10th International Symposium on Functional Materials (ISFM2024)　Local Steering Committee

    2024/08 -

  • 東北大学多元物質科学研究所 第18回 新機能無機物質探索研究センターシンポジウム　世話人

    2021/03 -

Show all ︎Show first 5

Professional Memberships 5

  • 日本無機マテリアル学会

    2021 - Present

  • 日本化学会

    2017/09 - Present

  • 日本希土類学会

    2016/11 - Present

  • 応用物理学会

    2016 - Present

  • 日本セラミックス協会

    2015 - Present

Research Interests 5

  • フォトセラミックス

  • 希土類化合物

  • セラミックス

  • 結晶構造解析

  • 蛍光体

Research Areas 3

  • Nanotechnology/Materials / Nanostructure chemistry /

  • Nanotechnology/Materials / Functional solid-state chemistry /

  • Nanotechnology/Materials / Inorganic compounds/materials chemistry /

Awards 5

  1. 第77回日本セラミックス協会進歩賞

    2023/06　日本セラミックス協会　酸化物をホスト結晶とした新規赤色蛍光体の開発

  2. 第２回イムラ・ジャパン賞

    2018/03　イムラ・ジャパン　植物の生長を促進し，安定供給を実現する無機波長変換材料の開発

  3. 2016年度 IDY学生奨励賞

    2017/01　情報ディスプレイ研究会　Mn4+を発光中心とした赤色蛍光体の合成と蛍光特性評価

  4. 日本電子材料技術協会第52回秋期講演大会 優秀発表賞

    2015　日本電子材料技術協会　アークイメージング炉を用いたガラス蛍光体の合成

  5. Poster Award

    2014　10. International Symposium for Phosphor Materials and Applications Phosphor Safari 2014　Study on the synthesis of novel red-emitting Ce3+ activated oxide phosphors

Papers 104

  1. Insights into the phase transition behavior of thermochromic VO2 (M1) powders doped with Tungsten

    Yibei Xue, Lei Miao, Takuya Hasegawa, Ayahisa Okawa, Tomoyo Goto, Yeongjun Seo, Tohru Sekino, Shu Yin

    Advanced Powder Technology　36　(5)　104857-104857　2025/05

    Publisher: Elsevier BV

    DOI： 10.1016/j.apt.2025.104857 　

    ISSN： 0921-8831

  2. Phosphorus Doping Coupled with Gradient Film Strategy to Achieve Thermochromic Performance Enhancement of VO2

    Yibei Xue, Peng Song, Lei Miao, Takuya Hasegawa, Ayahisa Okawa, Tomoyo Goto, Yeongjun Seo, Ryo Maezono, Tohru Sekino, Shu Yin

    ACS Applied Materials & Interfaces　2025/03/13

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acsami.4c19835 　

    ISSN： 1944-8244

    eISSN： 1944-8252

  3. Fabrication of Cs0.33WO3-g-C3N4-rGO nanocomposite for near-infrared shielding and photocatalysis applications

    Vinda Puspasari, Qiuyu Jin, Yibei Xue, Ayahisa Okawa, Takuya Hasegawa, Shu Yin

    Applied Surface Science　162983-162983　2025/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.apsusc.2025.162983 　

    ISSN： 0169-4332

  4. Surface facet engineering of ZnIn2S4 via supercritical hydrothermal synthesis for enhanced NO gas sensing performance

    Ardiansyah Taufik, Lei Miao, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    Applied Surface Science　684　161845-161845　2025/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.apsusc.2024.161845 　

    ISSN： 0169-4332

  5. Optical Properties of Cobalt/Nickel Doped SrAl12O19 Blue Inorganic Pigments and Their Application in 3YSZ Ceramics

    Qiuyu Cheng, Zhiwei Wang, Ayahisa Okawa, Takuya Hasegawa, Yamato Hayashi, Tohru Sekino, Shu Yin

    Journal of Alloys and Compounds　179402-179402　2025/02

    Publisher: Elsevier BV

    DOI： 10.1016/j.jallcom.2025.179402 　

    ISSN： 0925-8388

  6. Optical properties and application of blue and purple inorganic pigment powders based on cobalt/nickel doped Sr2MgSi2O7

    Qiuyu Cheng, Zhiwei Wang, Ayahisa Okawa, Takuya Hasegawa, Tohru Sekino, Shu Yin

    Solid State Sciences　107869-107869　2025/02

    Publisher: Elsevier BV

    DOI： 10.1016/j.solidstatesciences.2025.107869 　

    ISSN： 1293-2558

  7. W/Mo/Cr Doping Modulates the Negative–Positive Inversion Gas Sensing Behavior of VO2(M1)

    Lei Miao, Yibei Xue, Peng Song, Takuya Hasegawa, Ayahisa Okawa, Ryo Maezono, Tohru Sekino, Shu Yin

    ACS Sensors　2025/01/09

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acssensors.4c03006 　

    ISSN： 2379-3694

    eISSN： 2379-3694

  8. Novel Selectivity: Target of Gas Sensing Defined by Behavior

    Lei Miao, Peng Song, Yibei Xue, Zhufeng Hou, Takuya Hasegawa, Ayahisa Okawa, Tomoyo Goto, Yeongjun Seo, Ryo Maezono, Tohru Sekino, Shu Yin

    Advanced Materials　2024/12/19

    Publisher: Wiley

    DOI： 10.1002/adma.202413023 　

    ISSN： 0935-9648

    eISSN： 1521-4095

    More details Close

    Abstract Traditional selectivity of gas sensors determined by the magnitude of the response value has significant limitations. The distinctive inversion sensing behavior not only defies the traditional sensing theory but also provides insight into defining selectivity. Herein, the novel definition of selectivity is established in a study with VO2(M1). The sensing behavior of VO2(M1) is investigated after its synthesis conditions optimization by machine learning. In gases of the same nature, VO2(M1) shows remarkably selective for NH3 marked with unique resistance increase behavior. Such anomalous behavior is attributed to the formation of the Schottky junction between VO2(M1) and the electrode. The “work function‐electron affinity” relation is summarized as the selectivity coefficient, a parameter for predicting the selectivity of the sensing material effectively.

  9. Luminescence Tuning of NIR Luminescence Nanophosphor Bi3+/Yb3+-Doped RE2MoO6 (RE = Gd, Y, and Lu) and Gd2Mo1–xWxO6

    Taisei Hangai, Takuya Hasegawa, Jian Xu, Takayuki Nakanishi, Takashi Takeda, Tomoyo Goto, Yasushi Sato, Ayahisa Okawa, Shu Yin

    The Journal of Physical Chemistry C　2024/11/15

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.jpcc.4c04814 　

    ISSN： 1932-7447

    eISSN： 1932-7455

  10. Control of Particle Morphology and Orientation in Rare-Earth Layered Molybdate Phosphors Particles

    Takuya Hasegawa, Suzuka Noda, Ayahisa Okawa, Shu Yin

    Journal of the Society of Powder Technology, Japan　61　(11)　687-693　2024/11/10

    Publisher: The Society of Powder Technology, Japan

    DOI： 10.4164/sptj.61.687 　

    ISSN： 0386-6157

    eISSN： 1883-7239

  11. Synthesis of Novel Colored Substrate-free Pearlescent Pigments of Vanadium Phosphates with Large-size Layered Platelet Morphology

    Qiuyu CHENG, Yibei XUE, Takuya HASEGAWA, Ayahisa OKAWA, Kizuku KUSHIMOTO, Junya KANO, Tohru SEKINO, Shu YIN

    Journal of Alloys and Compounds　177735-177735　2024/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.jallcom.2024.177735 　

    ISSN： 0925-8388

  12. Coloring Properties of Blue Inorganic Pigments Based on Cobalt/Nickel Doped Strontium Magnesium β-Alumina Structure in 3YSZ Ceramics

    Qiuyu CHENG, Ayahisa OKAWA, Takuya HASEGAWA, Yamato HAYASHI, Tohru SEKINO, Shu YIN

    Ceramics International　2024/10

    Publisher: Elsevier BV

    DOI： 10.1016/j.ceramint.2024.10.208 　

    ISSN： 0272-8842

  13. Unveiling the NIR modulation performance enhancement of VO2 endowed by oxygen vacancy elimination

    Yibei Xue, Lei Miao, Peng Song, Takuya Hasegawa, Ayahisa Okawa, Ryo Maezono, Tohru Sekino, Shu Yin

    Solar Energy Materials and Solar Cells　274　113007-113007　2024/08

    Publisher: Elsevier BV

    DOI： 10.1016/j.solmat.2024.113007 　

    ISSN： 0927-0248

  14. High-temperature corrosion of sintered RE2Si2O7 (RE = Yb and Ho) environmental barrier coating materials by volcanic ash Peer-reviewed

    Ayahisa Okawa, Son Thanh Nguyen, Tadachika Nakayama, Thi-Mai-Dung Do, Hisayuki Suematsu, Shu Yin, Takuya Hasegawa, Tsuneo Suzuki, Takashi Goto, Koichi Niihara

    International Journal of Minerals, Metallurgy and Materials　31　(7)　1628-1638　2024/05/28

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s12613-024-2899-3 　

    ISSN： 1674-4799

    eISSN： 1869-103X

  15. Acquisition of Emissive Single-Crystalline AEu(MoO4)2 (A = Na, K, Rb, and Cs) Double Molybdates by One-Pot Hydrothermal Synthesis: Relationship between Particle Morphology and Photoluminescence Properties

    Suzuka Noda, Takuya Hasegawa, Tomoyo Goto, Yasushi Sato, Ayahisa Okawa, Shu Yin

    Crystal Growth & Design　2024/04/04

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.cgd.4c00332 　

    ISSN： 1528-7483

    eISSN： 1528-7505

  16. Key Role of Metal-to-Metal Charge Transfer Transition between Mo6+ and Bi3+ for Enhancement in NIR Luminescence of Gd2MoO6:Bi,Yb Nanophosphor

    Taisei Hangai, Takuya Hasegawa, Jian Xu, Takayuki Nakanishi, Takashi Takeda, Kosuke Nakano, Kenta Hongo, Ryo Maezono, Tomoyo Goto, Yasushi Sato, Ayahisa Okawa, Shu Yin

    The Journal of Physical Chemistry C　2024/02/15

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.jpcc.3c07501 　

    ISSN： 1932-7447

    eISSN： 1932-7455

  17. Uncovering the distinctive phase transition characteristics and thermochromic performance of VO2 with different N-doping sites

    Yibei Xue, Lei Miao, Takuya Hasegawa, Ayahisa Okawa, Shunya Yoshino, Hideki Kato, Masato Kakihana, Shu Yin

    Applied Surface Science　159779-159779　2024/02

    Publisher: Elsevier BV

    DOI： 10.1016/j.apsusc.2024.159779 　

    ISSN： 0169-4332

  18. One-pot facile synthesis of rod-like Bi2S3 particle in deep eutectic solvent and its ppb-level selective H2S gas detection

    Reiko Furukawa, Takuya Hasegawa, Ayahisa Okawa, Shu Yin

    Dalton Transactions　2024

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d4dt03006k 　

    ISSN： 1477-9226

    eISSN： 1477-9234

    More details Close

    Bismuth sulfide, Bi2S3, was prepared by a one-pot reaction using various choline chloride-based deep eutectic solvents (DESs) as the reaction field. Rod-like particles obtained with acetamide-thioacetamide-based DESs were found to...

  19. Er3+/Tm3+ co-doped Zr0.85Y0.15O1.925:Yb3+ phosphors: Dual-mode ratiometric thermometry based on near infrared up-conversion/down-shifting photoluminescence

    Takuya Hasegawa, Yuki Takahashi, Tomoyo Goto, Yasushi Sato, Ayahisa Okawa, Shu Yin

    Dalton Transactions　2024

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d4dt01972e 　

    ISSN： 1477-9226

    eISSN： 1477-9234

    More details Close

    Ratiometric thermometry is among the emerging applications in phosphor materials. Particularly, the technique of ultrafine-space thermometry has garnered significant attention in bio-imaging. Near-infrared (NIR) light, with its high tissue permeability,...

  20. Relationship between Bandgap Energy and Photoluminescence Properties of Pr3+-activated Complex Perovskite Oxide by Cation–Nitrogen Substitution

    Suzuka Noda, Yasushi Sato, Takuya Hasegawa, Masato Kakihana, Shu Yin

    New Journal of Chemistry　2024

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d3nj05682a 　

    ISSN： 1144-0546

    eISSN： 1369-9261

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    The photoluminescence properties of f–f emission-type phosphors are strongly dependent on the electronic structure of the host materials. This study investigated in detail the relationship between the bandgap energy and...

  21. Elucidation of Structural Features and Photoluminescence Properties for Hydrothermally-synthesized γ-KEu(MoO4)2 Microcrystal Phosphor with Metastable Orthorhombic Structure and Differences of Luminescence Properties by Structure Transition Due to Y3+-dilution

    Takuya Hasegawa, Suzuka Noda, Wataru Hikita, Kenji Toda, Ayahisa Okawa, Shu Yin

    New Journal of Chemistry　2024

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d3nj05866b 　

    ISSN： 1144-0546

    eISSN： 1369-9261

    More details Close

    Potassium europium molybdate, KEu(MoO4)2,is an intriguing material known for its efficient luminescence properties attributed to Eu3+ ions and its polymorphic nature. Despite its significance, research on the metastable γ-phase has...

  22. Vanadium-Containing Keggin-Type Polyoxometalates, [VM12O40]3– and [VVM11O40]4– (M = Mo, W): Structural Characterization and Voltammetric, NMR, and EPR Studies Related to Electrochemical Reduction at Framework and Central Vanadium Sites

    Sousuke Yokoyama, Shinya Azuma, Yohei Eguchi, Keisuke Kodani, Takuya Hasegawa, Shuhei Ogo, Hiromi Ota, Si-Xuan Guo, John F. Boas, Jie Zhang, Alan M. Bond, Tadaharu Ueda

    Inorganic Chemistry　63　(1)　117-128　2023/12/23

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.inorgchem.3c01921 　

    ISSN： 0020-1669

    eISSN： 1520-510X

  23. Control of the Emission and Excitation Energies in Pr3+-Activated Perovskite Oxide–Oxynitrides by Bandgap Engineering

    Yasushi Sato, Jin Odahara, Rie Yanamoto, Suzuka Noda, Takuya Hasegawa, Shu Yin, Junjun Jia, Masato Kakihana

    Chemistry of Materials　2023/12/22

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.chemmater.3c02119 　

    ISSN： 0897-4756

    eISSN： 1520-5002

  24. Photoluminescence/Optical-absorption modulation of layered lanthanide molybdates for chemical sensing of reductive materials

    Takuya Hasegawa, Yuzuki Kanaoka, Suzuka Noda, Ayahisa Okawa, Shu Yin

    Chemistry Letters　2023/12/05

    Publisher: Oxford University Press (OUP)

    DOI： 10.1093/chemle/upad005 　

    ISSN： 0366-7022

    eISSN： 1348-0715

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    Abstract This work have found K1-δHδEu(MoO4)2 as a novel material for detecting reducing agents. The red emission from Eu3+ was notably diminished in the presence of the reducing agent, followed by its restoration in the presence of the oxidizing agent, demonstrating a significant luminescence modulation. This effect is believed to be induced by polaron absorption between Mo5+ and Mo6+, deactivating the red luminescence of Eu3+. Notably, the facile proton deinsertion stemming from the layered structure contributed to its exceptional restoration capability.

  25. Developments of Eu2+/Ce3+-activated red luminescence in oxide host matrices with strong crystal field coordination

    Takuya Hasegawa

    Journal of the Ceramic Society of Japan　131　(9)　533-541　2023/09

    DOI： 10.2109/jcersj2.23087 　

    ISSN： 1882-0743

    eISSN： 1348-6535

  26. Gas sensing performance of Nb2CTx synthesized by hydrothermal assisted in-situ HF generation etching method Peer-reviewed

    Ayahisa Okawa, Mingyang Yang, Takuya Hasegawa, Tadaharu Ueda, Sunghun Cho, Tohru Sekino, Shu Yin

    3　(1)　2023/05

    DOI： 10.1007/s43939-023-00048-4 　

  27. Phase transition behavior and optical properties of F/Mo co-doped VO2 for smart windows Peer-reviewed

    Nonoko Suzuki, Yibei Xue, Takuya Hasegawa, Shu Yin

    Solar Energy Materials and Solar Cells　251　112105-112105　2023/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.solmat.2022.112105 　

    ISSN： 0927-0248

  28. Liquid-phase oxidation synthesis of WS2-WO3 particles with enhanced gas sensing performance

    Chinatsu Yoshizawa, Takuya Hasegawa, Ayahisa Okawa, Shu Yin

    Functional Materials Letters　16　(01)　2023/02/23

    Publisher: World Scientific Pub Co Pte Ltd

    DOI： 10.1142/s1793604723400015 　

    ISSN： 1793-6047

    eISSN： 1793-7213

    More details Close

    In this study, [Formula: see text] particles were successfully synthesized by a solvothermal liquid-phase oxidation process under various conditions and their gas sensing performance was evaluated at room temperature. The sample synthesized in ethanol-rich solvent at 210[Formula: see text]C showed excellent gas sensing performance. It is suggested that the crystalline phase and the particle morphology, which are essential for improving gas sensing performance, are effectively controllable by the present liquid phase oxidation process.

  29. Cerium(III) Niobate Layered Perovskites: Abnormal Optical Absorption Modulations by Tuning of B-Site Composition and Perovskite Layer Charge Control

    Takuya Hasegawa, Tadaharu Ueda, Yusuke Asakura, Shu Yin

    Inorganic Chemistry　61　(50)　20636-20646　2022/12/02

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.inorgchem.2c03550 　

    ISSN： 0020-1669

    eISSN： 1520-510X

  30. Recent Advances in Ternary Metal Oxides Modified by N Atom for Photocatalysis

    Jingwen Wang, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    Catalysts　12　(12)　1568-1568　2022/12/02

    Publisher: MDPI AG

    DOI： 10.3390/catal12121568 　

    eISSN： 2073-4344

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    Ternary metal oxides (TMOs) with flexible band structures are of significant potential in the field of photocatalysis. The efficient utilization of renewable and green solar energy is of great importance to developing photocatalysts. To date, a wide range of TMOs systems has been developed as photocatalysts for water and air purification, but their practical applications in visible light-assisted chemical reactions are hindered mainly by its poor visible light absorption capacity. Introduction of N atoms into TMOs can narrow the band-gap energy to a lower value, enhance the absorption of visible light and suppress the recombination rate of photogenerated electrons and holes, thus improving the photocatalytic performance. This review summarizes the recent research on N-modified TMOs, including the influence of N doping amounts, N doping sites, and N-induced phase transformation. The introduced N greatly tuned the optical properties, electronic structure, and photocatalytic activity of the TMOs. The optimal N concentration and the influence of N doping sites are investigated. The substitutional N and interstitial N contributed differently to the band gap and electron transport. The introduced N can tune the vacancies in TMOs due to the charge compensation, which is vital for inducing different activity and selectivity. The topochemical ammonolysis process can convert TMOs to oxynitride with visible light absorption. By altering the band structures, these oxynitride materials showed enhanced photocatalytic activity. This review provides an overview of recent advances in N-doped TMOs and oxynitrides derived from TMOs as photocatalysts for environmental applications, as well as some relevant pointers for future burgeoning research development.

  31. Morphology and facet tailoring of CaSnO3 assembled in molten salt with defect-mediated photocatalytic activity

    Jingwen Wang, Yusuke Asakura, Takuya Hasegawa, Shu Yin

    Journal of Environmental Chemical Engineering　10　(5)　108169-108169　2022/10

    Publisher: Elsevier BV

    DOI： 10.1016/j.jece.2022.108169 　

    ISSN： 2213-3437

  32. Crystal-phase and Surface-Structure Engineering of MoS<sub>2</sub> for Improving Gas Sensor Performance at Room Temperature

    Ardiansyah Taufik, Yusuke Asakura, Takuya Hasegawa, Hideki Kato, Masato Kakihana, Rosari Saleh, Tohru Sekino, Shu Yin

    Journal of the Society of Powder Technology, Japan　59　(7)　338-347　2022/07/10

    Publisher: The Society of Powder Technology, Japan

    DOI： 10.4164/sptj.59.338 　

    ISSN： 0386-6157

    eISSN： 1883-7239

  33. Synthesis of star-like BiVO4 photocatalysts by organic-aqueous hetero-phase reaction: Interaction between bismuth and amino group of oleylamine

    Taisei Hangai, Namiki Uchiyama, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    Functional Materials Letters　15　(04)　2022/05

    Publisher: World Scientific Pub Co Pte Ltd

    DOI： 10.1142/s1793604722500205 　

    ISSN： 1793-6047

    eISSN： 1793-7213

    More details Close

    The bismuth vanadate (BiVO4) photocatalyst was successfully synthesized by an organic-aqueous hetero-phase reaction method using organic additives (oleic acid, oleyl alcohol, and oleylamine) to investigate the reaction mechanism. The BiVO4 with a star-like morphology could be synthesized with oleylamine. Bismuth precursors formed by the interaction between bismuth and the amino group of oleylamine were nano-sized complex particles with amorphous phase, finally resulted in the formation of star-like morphology. Moreover, BiVO4 synthesized with oleylamine showed excellent photocatalytic activity on degradation of rhodamine B.

  34. Synthesis and color tuning of titanium oxide inorganic pigment by phase control and mixed-anion co-doping

    Jindi Cao, Takuya Hasegawa, Yusuke Asakura, Peng Sun, Shuo Yang, Bin Li, Wenbin Cao, Shu Yin

    Advanced Powder Technology　33　(5)　103576-103576　2022/05

    Publisher: Elsevier BV

    DOI： 10.1016/j.apt.2022.103576 　

    ISSN： 0921-8831

    eISSN： 1568-5527

  35. Utility of NaMoO 3 F as a Precursor for Homogeneous Distribution of Cobalt Dopants in Molybdenum Oxynitrides

    Yusuke Asakura, Takuya Hasegawa, Shu Yin

    Chemistry – An Asian Journal　17　(10)　2022/04/06

    Publisher: Wiley

    DOI： 10.1002/asia.202200143 　

    ISSN： 1861-4728

    eISSN： 1861-471X

  36. Electrochromic Behavior Originating from the W6+/W5+ Redox in Aurivillius-type Tungsten-Based Layered Perovskites Peer-reviewed

    Reona Iimura, Takuya Hasegawa, Shu Yin

    Inorganic Chemistry　61　(5)　2509-2516　2022/01/23

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.inorgchem.1c03364 　

    ISSN： 0020-1669

    eISSN： 1520-510X

  37. Electrochemical antioxidant capacity measurement: a downsized system and its application to agricultural crops

    Hiroki Ishida, Naoki Yamasaki, Yuuki Otsuka, Daichi Mori, Tomoko Shimamura, Takuya Hasegawa, Shuhei Ogo, Tadaharu Ueda

    Analytical Sciences　38　(1)　151-156　2022/01

    DOI： 10.2116/analsci.21P217 　

    ISSN： 0910-6340

    eISSN： 1348-2246

  38. Coprecipitation synthesis of Ca<inf>14</inf>Al<inf>10</inf>Zn<inf>6</inf>O<inf>35</inf>:Mn4+ deep-red phosphor and silica-modified waterproofing ability

    Ayu Nakagawa, Hirotoshi Nakabayashi, Yoshinori Nishiwaki, Shuhei Ogo, Tadaharu Ueda, Takuya Hasegawa

    Journal of the American Ceramic Society　2022

    DOI： 10.1111/jace.18831 　

    ISSN： 0002-7820

    eISSN： 1551-2916

  39. Morphology Control of Transition Metal Oxides by Liquid-Phase Process and Their Material Development

    Shu Yin, Takuya Hasegawa

    KONA Powder and Particle Journal　40　94-108　2022

    Publisher: Hosokawa Powder Technology Foundation

    DOI： 10.14356/kona.2023015 　

    ISSN： 0288-4534

    eISSN： 2187-5537

  40. Mechanism investigation of the enhanced oxygen storage performance of YBaCo4O7+δ synthesized by a glycine-complex decomposition method

    Ting Ru Chen, Takuya Hasegawa, Sung Hun Cho, Tomoyo Goto, Tohru Sekino, Masato Kakihana, Shu Yin

    Chemical Communications　58　(17)　2822-2825　2022

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d1cc06157g 　

    ISSN： 1359-7345

    eISSN： 1364-548X

  41. Improvement of the Oxygen Storage/Release Speed of YBaCo<inf>4</inf>O<inf>7+δ</inf>Synthesized by a Glycine-Complex Decomposition Method

    Tingru Chen, Takuya Hasegawa, Yusuke Asakura, Masato Kakihana, Teruki Motohashi, Shu Yin

    ACS Applied Materials and Interfaces　13　(43)　51008-51017　2021/11/03

    DOI： 10.1021/acsami.1c15419 　

    ISSN： 1944-8244

    eISSN： 1944-8252

  42. An ultra-sensitive room temperature toluene sensor based on molten-salts modified carbon nitride

    Zijing Wang, Zhanyong Gu, Fen Wang, Angga Hermawan, Shingo Hirata, Yusuke Asakura, Takuya Hasegawa, Jianfeng Zhu, Miki Inada, Shu Yin

    Advanced Powder Technology　32　(11)　4198-4209　2021/11

    DOI： 10.1016/j.apt.2021.09.027 　

    ISSN： 0921-8831

    eISSN： 1568-5527

  43. High-concentration N-doped La2Ti2O7 nanocrystals: Effects of nano-structuration and doping sites on enhancing the photocatalytic activity

    Jingwen Wang, Yusuke Asakura, Takuya Hasegawa, Shu Yin

    Chemical Engineering Journal　423　130220-130220　2021/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.cej.2021.130220 　

    ISSN： 1385-8947

  44. Enhanced visible-light-induced photocatalytic NOx degradation over (Ti,C)-BiOBr/Ti3C2Tx MXene nanocomposites: Role of Ti and C doping

    Angga Hermawan, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    Separation and Purification Technology　270　118815-118815　2021/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.seppur.2021.118815 　

    ISSN： 1383-5866

    eISSN： 1873-3794

  45. Polyoxometalates in Imidazolim-based Ionic Liquids: Acceptor Number and Polarity Estimated from Their Voltammetric Behaviour

    Hiroki ISHIDA, Shinya AZUMA, Naoki YAMASAKI, Hitomi KURITA, Takuya HASEGAWA, Shuhei OGO, Tadaharu UEDA

    Analytical Sciences　37　(8)　1131-1137　2021/08/10

    Publisher: Japan Society for Analytical Chemistry

    DOI： 10.2116/analsci.20p412 　

    ISSN： 0910-6340

    eISSN： 1348-2246

  46. MoS2–xSex Nanoparticles for NO Detection at Room Temperature

    Ardiansyah Taufik, Yusuke Asakura, Takuya Hasegawa, Shu Yin

    ACS Applied Nano Materials　4　(7)　6861-6871　2021/07/23

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acsanm.1c00926 　

    ISSN： 2574-0970

    eISSN： 2574-0970

  47. Remarkable Effects of Lanthanide Substitution for the Y-Site on the Oxygen Storage/Release Performance of YMnO3+δ

    Mayu Otomo, Takuya Hasegawa, Yusuke Asakura, Shu Yin

    ACS Applied Materials & Interfaces　13　(27)　31691-31698　2021/07/14

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acsami.1c06880 　

    ISSN： 1944-8244

    eISSN： 1944-8252

  48. SnO-SnO<inf>2</inf> modified two-dimensional MXene Ti<inf>3</inf>C<inf>2</inf>T<inf>x</inf> for acetone gas sensor working at room temperature

    Zijing Wang, Fen Wang, Angga Hermawan, Yusuke Asakura, Takuya Hasegawa, Hiromu Kumagai, Hideki Kato, Masato Kakihana, Jianfeng Zhu, Shu Yin

    Journal of Materials Science and Technology　73　128-138　2021/05/20

    DOI： 10.1016/j.jmst.2020.07.040 　

    ISSN： 1005-0302

  49. A simple and novel effective strategy using mechanical treatment to improve the oxygen uptake/release rate of YBaCo<inf>4</inf>O<inf>7+δ</inf> for thermochemical cycles

    Tingru Chen, Yusuke Asakura, Takuya Hasegawa, Teruki Motohashi, Shu Yin

    Journal of Materials Science and Technology　68　8-15　2021/03/30

    DOI： 10.1016/j.jmst.2020.06.043 　

    ISSN： 1005-0302

  50. Ce(iv)-centered charge-neutral perovskite layers topochemically derived from anionic [CeTa2O7]− layers Peer-reviewed

    Takuya Hasegawa, Naoki Yamasaki, Yusuke Asakura, Tadaharu Ueda, Shu Yin

    Chemical Science　12　(45)　15016-15027　2021

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d1sc03053a 　

    ISSN： 2041-6520

    eISSN： 2041-6539

  51. Intrinsic carbon-doping induced synthesis of oxygen vacancies-mediated TiO2 nanocrystals: Enhanced photocatalytic NO removal performance and mechanism

    Zhanyong Gu, Zhitao Cui, Zijing Wang, Ken Sinkou Qin, Yusuke Asakura, Takuya Hasegawa, Kenta Hongo, Ryo Maezono, Shu Yin

    Journal of Catalysis　393　179-189　2021/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.jcat.2020.11.025 　

    ISSN： 0021-9517

    eISSN： 1090-2694

  52. Carbon vacancies and hydroxyls in graphitic carbon nitride: Promoted photocatalytic NO removal activity and mechanism

    Zhanyong Gu, Zhitao Cui, Zijing Wang, Ken Sinkou Qin, Yusuke Asakura, Takuya Hasegawa, Satoshi Tsukuda, Kenta Hongo, Ryo Maezono, Shu Yin

    Applied Catalysis B: Environmental　279　2020/12/15

    DOI： 10.1016/j.apcatb.2020.119376 　

    ISSN： 0926-3373

  53. Solvothermal synthesis of potassium, rubidium, and cesium molybdenum oxyfluorides

    Yusuke Asakura, Takuya Hasegawa, Shu Yin

    Journal of the Ceramic Society of Japan　128　(12)　1061-1065　2020/12

    DOI： 10.2109/jcersj2.20182 　

    ISSN： 1882-0743

    eISSN： 1348-6535

  54. Phase stabilization of red-emitting olivine-type NaMgPO<inf>4</inf>:Eu2+phosphors: Via molten-phase quenching

    Takuya Hasegawa, Masato Iwaki, Ryo Tanaka, Sun Woog Kim, Shu Yin, Kenji Toda

    Inorganic Chemistry Frontiers　7　(21)　4040-4051　2020/11/07

    DOI： 10.1039/d0qi00880j 　

    eISSN： 2052-1553

  55. Octahedral morphology of NiO with (111) facet synthesized from the transformation of NiOHCl for the NO<inf>: X</inf>detection and degradation: Experiment and DFT calculation

    Angga Hermawan, Adie Tri Hanindriyo, Erland Rachmad Ramadhan, Yusuke Asakura, Takuya Hasegawa, Kenta Hongo, Miki Inada, Ryo Maezono, Shu Yin

    Inorganic Chemistry Frontiers　7　(18)　3431-3442　2020/09/21

    DOI： 10.1039/d0qi00682c 　

    eISSN： 2052-1553

  56. Preparation of MGF phosphor by O<inf>2</inf> postannealing and impact on luminescence properties and crystal lattice

    Takuya Hasegawa, Ryo Tanaka, Tadaharu Ueda, Kenji Toda

    Journal of the American Ceramic Society　103　(9)　5145-5156　2020/09/01

    DOI： 10.1111/jace.17222 　

    ISSN： 0002-7820

    eISSN： 1551-2916

  57. Surface Engineering of 1T/2H-MoS<inf>2</inf>Nanoparticles by O<inf>2</inf>Plasma Irradiation as a Potential Humidity Sensor for Breathing and Skin Monitoring Applications

    Ardiansyah Taufik, Yusuke Asakura, Takuya Hasegawa, Hideki Kato, Masato Kakihana, Shingo Hirata, Miki Inada, Shu Yin

    ACS Applied Nano Materials　3　(8)　7835-7846　2020/08/28

    DOI： 10.1021/acsanm.0c01352 　

    eISSN： 2574-0970

  58. Impact of the Lithium Cation on the Voltammetry and Spectroscopy of [XVM<inf>11</inf>O<inf>40</inf>]n-(X = P, As (n = 4), S (n = 3); M = Mo, W): Influence of Charge and Addenda and Hetero Atoms

    Toru Konishi, Keisuke Kodani, Takuya Hasegawa, Shuhei Ogo, Si Xuan Guo, John F. Boas, Jie Zhang, Alan M. Bond, Tadaharu Ueda

    Inorganic Chemistry　59　(15)　10522-10531　2020/08/03

    DOI： 10.1021/acs.inorgchem.0c00876 　

    ISSN： 0020-1669

    eISSN： 1520-510X

  59. CuO Nanoparticles/Ti<inf>3</inf>C<inf>2</inf>T<inf>x</inf> MXene Hybrid Nanocomposites for Detection of Toluene Gas

    Angga Hermawan, Biao Zhang, Ardiansyah Taufik, Yusuke Asakura, Takuya Hasegawa, Jianfeng Zhu, Pei Shi, Shu Yin

    ACS Applied Nano Materials　3　(5)　4755-4766　2020/05/22

    DOI： 10.1021/acsanm.0c00749 　

    eISSN： 2574-0970

  60. Metal-substituted tungstosulfates with Keggin structure: Synthesis and characterization Peer-reviewed

    Shinya Azuma, Taiga Kadoguchi, Yohei Eguchi, Hikaru Hirabaru, Hiromi Ota, Masahiro Sadakane, Kazumichi Yanagisawa, Takuya Hasegawa, Tadaharu Ueda

    Dalton Transactions　49　(9)　2766-2770　2020/03/07

    DOI： 10.1039/c9dt04737a 　

    ISSN： 1477-9226

    eISSN： 1477-9234

  61. New layered perovskite family built from [CeTa2O7]− layers: coloring mechanism from unique multi-transitions Peer-reviewed

    Takuya Hasegawa, Atsushi Shigee, Yoshinori Nishiwaki, Makoto Nagasako, Adie Tri Hanindriyo, Kenta Hongo, Ryo Maezono, Tadaharu Ueda, Shu Yin

    Chemical Communications　2020

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d0cc03466e 　

    ISSN： 1359-7345

    eISSN： 1364-548X

    More details Close

    <p>A Ce3+-based layered perovskite compound, Dion–Jacobson type RbCeTa2O7, has been discovered for the first time by introducing only a trivalent cerium ion to form [CeTa2O7]− layers.</p>

  62. Quantitative Determination of the Effective Mn4+ Concentration in a Li<inf>2</inf>TiO<inf>3</inf>:Mn4+ Phosphor and Its Effect on the Photoluminescence Efficiency of Deep Red Emission Peer-reviewed

    Takuya Hasegawa, Yoshinori Nishiwaki, Fumito Fujishiro, Shinnosuke Kamei, Tadaharu Ueda

    ACS Omega　4　(22)　19856-19862　2019/11/26

    DOI： 10.1021/acsomega.9b02798 　

    eISSN： 2470-1343

  63. Improved luminescence properties of Na<inf>2</inf>TiSiO<inf>5</inf> phosphor by the Ge4+ doping in the crystal lattice Peer-reviewed

    Young Ji Park, Sun Woog Kim, Kazuma Sugimoto, Takuya Hasegawa, Koudai Tanima, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Journal of Ceramic Processing Research　20　(5)　460-463　2019/10

    DOI： 10.36410/jcpr.2019.20.5.460 　

    ISSN： 1229-9162

  64. Luminescence enhancement of LiSrPO<inf>4</inf>:Eu2+ phosphor by Mg2+ ion addition Peer-reviewed

    Shinnosuke Kamei, Tomoki Hatsumori, Takuya Hasegawa, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Materials Research Innovations　23　(6)　359-362　2019/09/19

    DOI： 10.1080/14328917.2018.1482650 　

    ISSN： 1432-8917

    eISSN： 1433-075X

  65. Blue-light-pumped wide-band red emission in a new Ce3+-activated oxide phosphor, BaCa<inf>2</inf>Y<inf>6</inf>O<inf>12</inf>:Ce3+: Melt synthesis and photoluminescence study based on crystallographic analyses Peer-reviewed

    Takuya Hasegawa, Masato Iwaki, Sun Woog Kim, Tadaharu Ueda, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Journal of Alloys and Compounds　797　1181-1189　2019/08/15

    DOI： 10.1016/j.jallcom.2019.05.155 　

    ISSN： 0925-8388

  66. Single Crystal Growth and Crystal Structure Analysis of Novel Orange-Red Emission Pure Nitride CaAl<inf>2</inf>Si<inf>4</inf>N<inf>8</inf>:Eu2+ Phosphor Peer-reviewed

    Shota Hasegawa, Takuya Hasegawa, Sun Woog Kim, Ryota Yamanashi, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    ACS Omega　4　(6)　9939-9945　2019/06/07

    DOI： 10.1021/acsomega.9b00606 　

    eISSN： 2470-1343

  67. Mild condition synthesis without high temperature process of Eu2+-doped barium orthosilicate nanophosphor via Water-Assisted Solid-State Reaction (WASSR) method Peer-reviewed

    Yusuke Shibuta, Takuya Hasegawa, Sun Woog Kim, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Journal of Alloys and Compounds　788　1009-1012　2019/06/05

    DOI： 10.1016/j.jallcom.2019.02.295 　

    ISSN： 0925-8388

  68. Blue-yellow multicolor phosphor, Eu2+-activated Li<inf>3</inf>NaSiO<inf>4</inf>: Excellent thermal stability and quenching mechanism Peer-reviewed

    Masato Iwaki, Shota Kumagai, Shoma Konishi, Atsuya Koizumi, Takuya Hasegawa, Kazuyoshi Uematsu, Atsushi Itadani, Kenji Toda, Mineo Sato

    Journal of Alloys and Compounds　776　1016-1024　2019/03/05

    DOI： 10.1016/j.jallcom.2018.10.299 　

    ISSN： 0925-8388

  69. Novel green Sr<inf>4</inf>ScAl<inf>3</inf>O<inf>10</inf>:Eu2+ phosphor prepared by the melt quenching technique Peer-reviewed

    Kenji Toda, Masato Iwaki, Minenori Katsu, Shin Nosuke Kamei, Sun Woog Kim, Takuya Hasegawa, Masaru Muto, Ryota Yamanashi, Tatsuya Sakamoto, Tadashi Ishigaki, Kazuyoshi Uematsu, Mineo Sato, Dae Ho Yoon

    Journal of Ceramic Processing Research　20　(3)　276-279　2019

    ISSN： 1229-9162

  70. Potentiometric evaluation of antioxidant capacity using polyoxometalate-immobilized electrodes Peer-reviewed

    Yukino Tanaka, Takuya Hasegawa, Tomoko Shimamura, Hiroyuki Ukeda, Tadaharu Ueda

    Journal of Electroanalytical Chemistry　828　102-107　2018/11/01

    DOI： 10.1016/j.jelechem.2018.09.024 　

    ISSN： 1572-6657

  71. Synthesis of Na<inf>2</inf>FePO<inf>4</inf>F using polytetrafluoroethylene Peer-reviewed

    Atsushi Tsu-Ura, Hirotaka Torii, Takuya Hasegawa, Dai Murayama, Sun Woog Kim, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Journal of the Ceramic Society of Japan　126　(5)　336-340　2018/05

    DOI： 10.2109/jcersj2.17230 　

    ISSN： 1882-0743

    eISSN： 1348-6535

  72. Paradigm Change for Solid State Reactions: Synthesis of Lithium Orthophosphate Li3PO4 Nanoparticles by a Water Assisted Solid State Reaction (WASSR) Method

    Sun Woog Kim, Kenji Toda, Takuya Hasegawa, Mizuki Watanabe, Tatsuro Kaneko, Ayano Toda, Atsushi Itadani, Mineo Sato, Kazuyoshi Uematsu, Tadashi Ishigaki, Junko Koide, Masako Toda, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    SCIENCE OF ADVANCED MATERIALS　10　(4)　592-596　2018/04

    DOI： 10.1166/sam.2018.2844 　

    ISSN： 1947-2935

    eISSN： 1947-2943

  73. Structure of triaquatris(1,1,1-trifluoro-4-oxo-pentan-2-olato)cerium(III) as a possible fluorescent compound Peer-reviewed

    Atsuya Koizumi, Takuya Hasegawa, Atsushi Itadani, Kenji Toda, Taoyun Zhu, Mineo Sato

    Acta Crystallographica Section E: Crystallographic Communications　74　229-232　2018/02

    DOI： 10.1107/S2056989018001135 　

    eISSN： 2056-9890

  74. Bluish-White Luminescence in Rare-Earth-Free Vanadate Garnet Phosphors: Structural Characterization of LiCa<inf>3</inf>MV<inf>3</inf>O<inf>12</inf> (M = Zn and Mg) Peer-reviewed

    Takuya Hasegawa, Yusuke Abe, Atsuya Koizumi, Tadaharu Ueda, Kenji Toda, Mineo Sato

    Inorganic Chemistry　57　(2)　857-866　2018/01/16

    DOI： 10.1021/acs.inorgchem.7b02820 　

    ISSN： 0020-1669

    eISSN： 1520-510X

  75. Synthesis of nano-sized materials using novel water assisted solid state reaction method Peer-reviewed

    Kenji Toda, Tatsuro Kaneko, Takuya Hasegawa, Mizuki Watanabe, Yusuke Abe, Takeshi Kuroi, Mineo Sato, Kazuyoshi Uematsu, Sun Woog Kim, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    Key Engineering Materials　777 KEM　163-167　2018

    DOI： 10.4028/www.scientific.net/KEM.777.163 　

    ISSN： 1013-9826

  76. Yellow MgV<inf>2</inf>O<inf>6</inf>·2H<inf>2</inf>O nanophosphor synthesized by a water-assisted solid-state reaction (WASSR) method at low temperature below 80 °C Peer-reviewed

    Sun Woog Kim, Yusuke Abe, Mizuki Watanabe, Takuya Hasegawa, Masaru Muto, Ayano Toda, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato, Emiko Kawakami, Junko Koide, Masako Toda, Yoshiaki Kudo, Toshiyuki Masui, Takaki Masaki, Dae Ho Yoon

    Dyes and Pigments　145　339-344　2017/10

    DOI： 10.1016/j.dyepig.2017.06.024 　

    ISSN： 0143-7208

    eISSN： 1873-3743

  77. Stabilization of novel high temperature phase yellow-emitting σ-type (Ba<inf>1-: X - Y</inf>Eu<inf>x</inf>Mg<inf>y</inf>)<inf>2</inf>P<inf>2</inf>O<inf>7</inf> phosphors using a melt synthesis technique Peer-reviewed

    H. Nakagawa, S. W. Kim, T. Hasegawa, S. Hasegawa, T. Ishigaki, K. Uematsu, K. Toda, H. Takaba, M. Sato

    Inorganic Chemistry Frontiers　4　(9)　1562-1567　2017/09

    DOI： 10.1039/c7qi00359e 　

    eISSN： 2052-1553

  78. On the possibility of polystyrene-derived carbon coating for NASICON-type Na<inf>3</inf>V<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf> composites as cathode materials for sodium-ion batteries Peer-reviewed

    Dai Okada, Takumi Fugane, Yuka Matsumoto, Takuya Hasegawa, Atsushi Itadani, Kazuyoshi Uematsu, Kenji Toda, Hideki Hashimoto, Jun Takada, Mineo Sato

    Journal of the Ceramic Society of Japan　125　(4)　322-325　2017/04

    DOI： 10.2109/jcersj2.16266 　

    ISSN： 1882-0743

    eISSN： 1348-6535

  79. Discovery of novel inorganic Mn5+-doped sky-blue pigments based on Ca<inf>6</inf>BaP<inf>4</inf>O<inf>17</inf>: Crystal structure, optical and color properties, and color durability Peer-reviewed

    Sun Woog Kim, Go Eun Sim, Ji Young Ock, Jeong Hun Son, Takuya Hasegawa, Kenji Toda, Dong Sik Bae

    Dyes and Pigments　139　344-348　2017/04

    DOI： 10.1016/j.dyepig.2016.12.038 　

    ISSN： 0143-7208

    eISSN： 1873-3743

  80. Development of water assisted solid state reaction for the ceramic materials Peer-reviewed

    Kenji Toda, Sun Woog Kim, Takuya Hasegawa, Mizuki Watanabe, Tatsuro Kaneko, Ayano Toda, Ryota Yamanashi, Shota Kumagai, Masaru Muto, Atsushi Itadani, Mineo Sato, Kazuyoshi Uematsu, Tadashi Ishigaki, Junko Koide, Masako Toda, Emiko Kawakami, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    Key Engineering Materials　751 KEM　353-357　2017

    DOI： 10.4028/www.scientific.net/KEM.751.353 　

    ISSN： 1013-9826

  81. Determination of the crystal structure and photoluminescence properties of NaEu<inf>1-x</inf>Gd<inf>x</inf>(MoO<inf>4</inf>)<inf>2</inf> phosphor synthesized by a water-assisted low-temperature synthesis technique Peer-reviewed

    Takuya Hasegawa, Sun Woog Kim, Yusuke Abe, Masaru Muto, Mizuki Watanabe, Tatsuro Kaneko, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato, Junko Koide, Masako Toda, Yoshiaki Kudo

    RSC Advances　7　(40)　25089-25094　2017

    DOI： 10.1039/c7ra01832k 　

    eISSN： 2046-2069

  82. Improvement of luminescence properties of rubidium vanadate, RbVO<inf>3</inf>, phosphors by erbium doping in the crystal lattice Peer-reviewed

    S. W. Kim, T. Hasegawa, M. Muto, A. Toda, T. Kaneko, K. Sugimoto, K. Uematsu, T. Ishigaki, K. Toda, M. Sato, J. Koide, M. Toda, Y. Kudo

    New Journal of Chemistry　41　(12)　4788-4792　2017

    DOI： 10.1039/c6nj03823a 　

    ISSN： 1144-0546

    eISSN： 1369-9261

  83. Formation of nanophosphors using novel water assisted solid state reaction Peer-reviewed

    Kenii Toda, Sun Woog Kim, Tadashi Ishigaki, Takuya Hasegawa, Yusuke Abe, Yusuke Shibuta, Kazuyoshi Uematsu, Mirteo Sato, Yoshiaki Kudo

    Proceedings of the International Display Workshops　1　622-625　2017

    ISSN： 1883-2490

  84. Environmentally friendly Rb<inf>3</inf>V<inf>5</inf>O<inf>14</inf> fluorescent red pigment Peer-reviewed

    Sun Woog Kim, Takuya Hasegawa, Mizuki Watanabe, Kazuma Sugimoto, Yu Saito, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Dyes and Pigments　136　219-223　2017/01/01

    DOI： 10.1016/j.dyepig.2016.08.040 　

    ISSN： 0143-7208

    eISSN： 1873-3743

  85. Luminescence of phosphor balls prepared using melt quenching synthesis method Peer-reviewed

    Takuya Hasegawa, Kenji Toda, Tadashi Ishigaki, Shinnosuke Kamei, Sun Woog Kim, Kazuyoshi Uematsu, Mineo Sato, Masahiro Yoshimura

    Materials Science Forum　883　17-21　2017

    DOI： 10.4028/www.scientific.net/MSF.883.17 　

    ISSN： 0255-5476

  86. Unusual, broad red emission of novel Ce3+-activated Sr<inf>3</inf>Sc<inf>4</inf>O<inf>9</inf> phosphors under visible-light excitation Peer-reviewed

    Takuya Hasegawa, Sun Woog Kim, Tadaharu Ueda, Tadashi Ishigaki, Kazuyoshi Uematsu, Hiromitsu Takaba, Kenji Toda, Mineo Sato

    Journal of Materials Chemistry C　5　(36)　9472-9478　2017

    DOI： 10.1039/c7tc03203j 　

    ISSN： 2050-7534

    eISSN： 2050-7526

  87. Development of a novel nontoxic vivid violet inorganic pigment – Mn3+-doped LaAlGe<inf>2</inf>O<inf>7</inf> Peer-reviewed

    Sun Woog Kim, Yu Saito, Takuya Hasegawa, Kenji Toda, Kazuyoshi Uematsu, Mineo Sato

    Dyes and Pigments　136　243-247　2017/01/01

    DOI： 10.1016/j.dyepig.2016.08.038 　

    ISSN： 0143-7208

    eISSN： 1873-3743

  88. A new lanthanum(III) complex containing acetylacetone and 1 H -imidazole Peer-reviewed

    Atsuya Koizumi, Takuya Hasegawa, Atsushi Itadani, Kenji Toda, Taoyun Zhu, Mineo Sato

    Acta Crystallographica Section E: Crystallographic Communications　73　1739-1742　2017

    DOI： 10.1107/S205698901701461X 　

    eISSN： 2056-9890

  89. Abnormal improvement in emission of lanthanum oxysulfide phosphor La<inf>2</inf>O<inf>2</inf>S:Tb3+ synthesized by a novel method, thermal decomposition in eutectic molten salt Peer-reviewed

    Sun Woog Kim, Takuya Hasegawa, Takeshi Abe, Hiroko Nakagawa, Shota Hasegawa, Kohei Seki, Kenji Toda, Kazuyoshi Uematsu, Tadashi Ishigaki, Mineo Sato

    Ceramics International　42　(8)　10389-10392　2016/06/01

    DOI： 10.1016/j.ceramint.2016.03.176 　

    ISSN： 0272-8842

  90. Novel soft chemical synthesis methods of ceramic materials Peer-reviewed

    Kenji Toda, Sun Woog Kim, Takuya Hasegawa, Mizuki Watanabe, Tatsuro Kaneko, Ayano Toda, Atsushi Itadani, Mineo Sato, Kazuyoshi Uematsu, Tadashi Ishigaki, Junko Koide, Masako Toda, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    Key Engineering Materials　690　268-271　2016

    DOI： 10.4028/www.scientific.net/KEM.690.268 　

    ISSN： 1013-9826

  91. Improved synthesis of SrLiAl<inf>3</inf>N<inf>4</inf>:Eu2+ phosphor using complex nitride raw material Peer-reviewed

    S. W. Kim, T. Hasegawa, S. Hasegawa, R. Yamanashi, H. Nakagawa, K. Toda, T. Ishigaki, K. Uematsu, M. Sato

    RSC Advances　6　(66)　61906-61908　2016

    DOI： 10.1039/c6ra14107b 　

    eISSN： 2046-2069

  92. Improvement of Emission Intensity for Near-infrared-emitting Ca<inf>14</inf>Zn<inf>6</inf>Al<inf>10</inf> O<inf>35</inf>:Mn4+ Phosphor by Oxygen-pressure Method Peer-reviewed

    Takuya Hasegawa, Sun Woog Kim, Takeshi Abe, Shota Kumagai, Ryota Yamanashi, Kohei Seki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Chemistry Letters　45　(9)　1096-1098　2016

    DOI： 10.1246/cl.160498 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  93. Rare-earth-free white emitting Ba<inf>2</inf>TiP<inf>2</inf>O<inf>9</inf> phosphor: Revealing its crystal structure and photoluminescence properties Peer-reviewed

    Takuya Hasegawa, Sun Woog Kim, Shinnosuke Kamei, Tadashi Ishigaki, Kazuyoshi Uematsu, Koutoku Ohmi, Kenji Toda, Mineo Sato

    Dalton Transactions　45　(28)　11554-11559　2016

    DOI： 10.1039/c6dt01715k 　

    ISSN： 1477-9226

    eISSN： 1477-9234

  94. Rare Earth-Doped Phosphors for White Light-Emitting Diodes Peer-reviewed

    M. Sato, S. W. Kim, Y. Shimomura, T. Hasegawa, K. Toda, G. Adachi

    Handbook on the Physics and Chemistry of Rare Earths　49　1-128　2016

    DOI： 10.1016/bs.hpcre.2016.03.001 　

    ISSN： 0168-1273

  95. Novel yellowish white-emitting Eu2+-activated phosphate phosphor based on Rb<inf>2</inf>Ba<inf>3</inf>P<inf>4</inf>O<inf>14</inf> Peer-reviewed

    Kazuma Sugimoto, Takuya Hasegawa, Sunwoog Kim, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Journal of Ceramic Processing Research　17　(5)　401-404　2016

    ISSN： 1229-9162

  96. Color tuning of oxide phosphors Peer-reviewed

    Sun Woog Kim, Kenji Toda, Takuya Hasegawa, Kazuyoshi Uematsu, Mineo Sato

    Phosphors, up Conversion Nano Particles, Quantum Dots and Their Applications: Volume 1　219-246　2016/01/01

    DOI： 10.1007/978-3-662-52771-9_7 　

  97. Synthesis and luminescent properties of novel Ca<inf>3</inf>Y<inf>3</inf>Ge<inf>2</inf>BO<inf>13</inf>:Ln3+ (Ln3+ = Tb3+ and Eu3+) phosphors Peer-reviewed

    Takuya Hasegawa, Natsuki Sato, Sun Woog Kim, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Journal of the Ceramic Society of Japan　123　(1438)　507-511　2015/06/01

    DOI： 10.2109/jcersj2.123.507 　

    ISSN： 1882-0743

    eISSN： 1348-6535

  98. Synthesis of Eu2+-activated Rb-Ba-Sc-Si-O glass phosphors using melt synthesis technique Peer-reviewed

    Sun Woog Kim, Takuya Hasegawa, Michiyo Inoue, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Journal of the Ceramic Society of Japan　122　(1426)　452-455　2014/06

    DOI： 10.2109/jcersj2.122.452 　

    ISSN： 1882-0743

    eISSN： 1348-6535

  99. Synthesis of blue-emitting (K <inf>1-x</inf>Na <inf>x</inf>)Mg <inf>4</inf>(PO <inf>4</inf>)<inf>3</inf>:Eu 2+ phosphors Peer-reviewed

    Sun Woog Kim, Takuya Hasegawa, Tadashi Ishigaki, Kazuyoshi Uematsu, Mineo Sato, Kenji Toda

    Journal of Information Display　15　(2)　53-57　2014/04

    DOI： 10.1080/15980316.2014.907213 　

    ISSN： 1598-0316

    eISSN： 2158-1606

  100. Novel reddish yellow-emitting Ce3+-doped Ba<inf>3</inf>Sc <inf>4</inf>O<inf>9</inf> phosphors for blue-light-based white LEDs Peer-reviewed

    Takuya Hasegawa, Sun Woog Kim, Tadashi Ishigaki, Kazuyoshi Uematsu, Hiromitsu Takaba, Kenji Toda, Mineo Sato

    Chemistry Letters　43　(6)　828-830　2014

    DOI： 10.1246/cl.140070 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  101. Title Synthesis and photoluminescence properties of Mn2+ co-doped white emitting (Sr,Sn)ZnP<inf>2</inf>O<inf>7</inf> phosphor Peer-reviewed

    Sun Woog Kim, Takuya Hasegawa, Hiroyuki Yumoto, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Journal of Ceramic Processing Research　15　(3)　177-180　2014

    ISSN： 1229-9162

  102. Study on luminescence properties of new borogermanate phosphors

    Takuya Hasegawa, Natsuki Sato, Tadashi Ishigaki, Sun Woog Kim, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Proceedings of the International Display Workshops　1　765-767　2013

    Publisher: International Display Workshops

    ISSN： 1883-2490

  103. New blue light excitable red-emitting phosphate phosphor

    Kenji Toda, Sun-Woog Kim, Tadashi Ishigaki, Takuya Hasegawa, Kazuyoshi Uematsu, Mineo Sato

    Proceedings of the International Display Workshops　1　715-716　2013

    Publisher: International Display Workshops

    ISSN： 1883-2490

  104. Efficient red emission of blue-light excitable new structure type NaMgPO<inf>4</inf>:Eu2+ phosphor Peer-reviewed

    Sun Woog Kim, Takuya Hasegawa, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    ECS Solid State Letters　2　(12)　2013

    DOI： 10.1149/2.004312ssl 　

    ISSN： 2162-8742

    eISSN： 2162-8750

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Misc. 9

  1. セリウム導入層状ペロブスカイトと電荷中性層の創成 Invited

    長谷川拓哉

    セラミックス　57　(8)　507-510　2022/08

  2. 液相反応場による環境応答機能性無機材料の合成 Invited

    殷澍, 長谷川拓哉, 李斌

    日本電子材料技術協会会報　52　13-21　2021

  3. Mn4+賦活酸化物蛍光体の発光効率向上に向けた新しい材料開発ガイドライン Invited

    長谷川拓哉, 殷澍

    セラミックス　55　(12)　880-884　2020/12

  4. New Path for Polyoxometalates: Controlled Synthesis and Characterization of Metal-Substituted Tungstosulfates

    Hikaru Hirabaru, Daisuke Kawamoto, Miho Ohnishi, Hiromi Ota, Masahiro Sadakane, Kazumichi Yanagisawa, Takuya Hasegawa, Tadaharu Ueda

    European Journal of Inorganic Chemistry　2020

    DOI： 10.1002/ejic.202000138 　

    ISSN： 1434-1948

    eISSN： 1099-0682

  5. Nanophosphors synthesized by the water-assisted solid-state reaction (WASSR) method: Luminescence properties and reaction mechanism of the WASSR method

    Sun Woog Kim, Takuya Hasegawa, Mizuki Watanabe, Masaru Muto, Toshiya Terashima, Yusuke Abe, Tatsuro Kaneko, Ayano Toda, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato, Emiko Kawakami, Junko Koide, Masako Toda, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    Applied Spectroscopy Reviews　53　(2-4)　177-194　2018/04

    DOI： 10.1080/05704928.2017.1390344 　

    ISSN： 0570-4928

    eISSN： 1520-569X

  6. 近紫外LED用新規白色蛍光体Na3Sc2(PO4)3:Eu2+,Tb3+,Mn2+におけるエネルギー移動

    岩城将人, 長谷川拓哉, 上松和義, 戸田健司, 佐藤峰夫

    希土類　(72)　2018

    ISSN： 0910-2205

  7. Eu2+によるLi3NaSiO4の白色発光メカニズムの解明

    岩城将人, 小泉敦也, 長谷川拓哉, 上松和義, 板谷篤司, 戸田健司, 佐藤峰夫

    希土類　(70)　2017

    ISSN： 0910-2205

  8. Synthesis of glass phosphors for white LEDs

    113　(408)　21-24　2014/01/24

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  9. Synthesis and Luminescence Property of Eu^<2+>-activated Phosphate Phosphor

    KAMEI Shinnosuke, HASEGAWA Takuya, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    (60)　62-63　2012/05/08

    ISSN： 0910-2205

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Presentations 36

  1. Dual-mode Ratiometric Thermometry in Yb-Er/Tm Multi-doping Yttria Stabilized Zirconia Phosphor Invited

    T. Hasegawa, A. Okawa, S. Yin

    The 23rd International Symposium on Eco-materials Processing and Design (ISEPD2025)　2025/01

  2. 反熱消光蛍光体の下方－上方変換蛍光を利用したサーモメトリ特性，第63回セラミックス基礎科学討論会 Invited

    長谷川拓哉, 古川 玲依子, 大川采久, 殷澍

    第63回セラミックス基礎科学討論会　2025/01

  3. Dual-mode ratiometric thermometry in YSZ:Yb-Er/Tm phosphor: Utilizing near infrared up-conversion/down-shifting photoluminescence

    T. Hasegawa, A. Okawa, S. Yin

    TU-USTB Joint Symposium　2024/10

  4. ワンポット水熱合成による層状希土類モリブデン酸蛍光体の特異形態制御，日本セラミックス協会第37回秋季シンポジウム

    長谷川拓哉, 野田紗伽, 大川采久, 殷 シュウ

    日本セラミックス協会第37回秋季シンポジウム　2024/09

  5. Yb-Er/Tm共ドープイットリア安定化ジルコニアナノ蛍光体の水熱合成と蛍光特性

    長谷川拓哉, 高橋祐希, 大川采久, 殷澍

    第40回希土類討論会　2024/05

  6. Layered lanthanide molybdate phosphors: Control of morphology, crystal phase, and luminescence properties Invited

    The 13th Advanced Lasers and Photon Sources (ALPS2024)　2024/04

  7. Yb3+-Er3+/Tm3+共添加安定化ジルコニアの微粒子合成とアップコンバージョン蛍光温度特性

    長谷川拓哉, 高橋祐希, 大川采久, 殷澍

    日本セラミックス協会2024年年会　2024/03/14

  8. Near-UV pumped near-IR luminescent Gd2MoO6:Yb-Bi nanophosphor Invited

    T. Hasegawa, T. Hangai, J. Xu, T. Nakanishi, T. Takeda, K. Nakano, K. Hongo, R. Maezono, A. Okawa, S. Yin

    The 37th International Korea- Japan Seminar on Ceramics　2023/11/16

  9. 希土類イオン共添加安定化ジルコニア微粒子のアップコンバージョン蛍光

    長谷川拓哉, 高橋祐希, 大川采久, 殷しゅう

    第147回無機マテリアル学会学術講演会　2023/11/10

  10. New Tungsten-based Layered perovskites: Structural Analysis and its Electrochromic Behaviour Invited

    T. Hasegawa, R. Iimura, A. Okawa, S. Yin

    International Congress on Pure & Applied Chemistry Bali (ICPAC Bali) 2023　2023/09/15

  11. 単粒子解析に基づくNaMg(P,Si)O4:Eu2+蛍光体の構造および蛍光特性評価

    長谷川拓哉, 武田隆史, 舟橋司朗, 許健, 中西貴之, 戸田健司, 大川采久, 殷しゅう

    日本セラミックス協会第36回秋季シンポジウム　2023/09/06

  12. NIR Photoluminescence in Nano-sized Molybdate Material for Improvement of Photovoltaic Efficiency of Crystalline Si Solar Cells

    T. Hasegawa, T. Hangai, A. Okawa, S. Yin

    International Symposium on Inorganic and Environmental Materials (ISIEM2023)　2023/06/20

  13. バナジン酸化合物の深共晶溶媒下での合成と機能

    長谷川拓哉, 佐藤拓弥, 大川采久, 殷シュウ

    第146回無機マテリアル学会学術講演会　2023/06/02

  14. Eu2+およびCe3+ドープ酸化物材料における赤色発光の実現 Invited

    長谷川拓哉

    応用物理学会 極限的励起状態の形成と量子エネルギー変換研究グループ 第10回研究会　2023/04/07

  15. 酸化物をホスト結晶とした新規赤色蛍光体の開発 Invited

    長谷川拓哉

    日本セラミックス協会2023年年会　2023/03/09

  16. Discovery of a Novel Tungsten-Containing Layered Perovskite and Its Electrochromic Behavior

    長谷川拓哉, 飯村玲於奈, 殷澍

    第61回セラミックス基礎科学討論会　2023/01/07

  17. Development of NIR-luminescent nano-phosphor materials for enhancement of photovoltaic efficiency of c-Si solar cell Invited

    T. Hasegawa, T. Hangai, S. Yin

    2022 ONLINE JOINT SYMPOSIUM Tohoku University & National Taipei University of Technology　2022/11/28

  18. A New Structural Form in Layered Perovskites: Charge-Neutral Perovskite Layer Composed from Tetravalent Cerium Invited

    T. Hasegawa, S. Yin

    International Congress on Pure & Applied Chemistry Kota Kinabalu (ICPAC KK) 2022　2022/11/24

  19. 電子構造制御に基づくセリウム含有層状ペロブスカイトの発色状態制御

    長谷川拓哉, 殷シュウ

    無機マテリアル学会 第145回 学術講演会　2022/11/11

  20. 結晶構造・電子構造に着目したセリウム含有酸化物の光機能創出 Invited

    長谷川拓哉

    日本セラミックス協会第35回秋季シンポジウム　2022/09/15

  21. Ce4+-centered Charge-neutral Perovskite Layer Transformed from Anionic [CeIIITa2O7]- by Topochemical Oxidation

    T. Hasegawa, S. Yin

    IUMRS-ICYRAM 2022　2022/08/03

  22. [Ce(Nb,Ta)2O7]層状ペロブスカイトの異常発色変化と層電荷制御

    長谷川拓哉, 上田忠治, 殷しゅう

    第38回希土類討論会　2022/05/12

  23. Ce-based layered perovskite oxynitride and its optical properties

    2021/12/09

  24. Discovery of new perovskite family “cerium-based layered perovskites”

    長谷川拓哉, 殷しゅう

    化学系学協会東北大会　2021/10/03

  25. NaMgPO4:Eu2+の急冷プロセスによるオリビン相の安定化

    長谷川 拓哉, 殷 澍, 戸田 健司

    日本セラミックス協会 第33回秋季シンポジウム　2021/09/02

  26. Ce3+を含有した層状ペロブスカイトの電子構造と化学的酸化還元能

    長谷川拓哉, 上田忠治, 殷しゅう

    第37回希土類討論会　2021/05/19

  27. Ce含有 Dion-Jacobson型層状ペロブスカイト酸化物の発見と特異的光学吸収

    長谷川拓哉, 殷シュウ, 上田忠治

    日本セラミックス協会2021年年会　2021/03/23

  28. Stabilization of Olivine Structure by Rapid Cooling from Molten-phase in Red-emitting NaMgPO :Eu Phosphor

    Takuya Hasegawa, Shu Yin, Kenji Toda

    The virtual 45th International Conference and Exposition on Advanced Ceramics　2021/02/11

  29. Ce3+を含む層状ペロブスカイト酸化物の発見

    長谷川拓哉, 重江篤司, 上田忠治, 朝倉裕介, 殷シュウ

    第 36 回希土類討論会　2020/05/19

  30. 酸素 アニーリング による Mg28Ge10O48-δFδ:Mn4+蛍光体 の 内部 量子効率 の 向上効果

    長谷川 拓哉, 殷シュウ, 上田 忠治, 戸田 健司

    日本セラミックス協会2020年会　2020/03/19

  31. 新規セリウム含有層状ペロブスカイトの発見

    重江 篤司, 西脇 芳典, 藤代 史, 上田 忠治, 長谷川 拓哉

    第26回 ヤングセラミスト・ミーティングin中四国　2019/12/07

  32. Quantitative Determination of Effective Mn4+ Concentration and its Influence on Photoluminescence Efficiency of Deep-red emission in Li2TiO3:Mn4+ International-presentation

    Takuya Hasegawa, Yoshinori Nishiwaki, Fumito Fujishiro, Shinnosuke Kamei, Tadaharu Ueda

    The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)　2019/10/28

  33. 4f-5d間遷移を利用した酸化物結晶中での赤色発光の新たな設計指針 Invited

    長谷川拓哉

    令和元年度高知化学会研究会　2019/08/31

  34. Material design concept for red emission generated by 4f 5d transition in oxide crystals

    Takuya Hasegawa, Tadaharu Ueda, Kenji Toda, Mineo Sato

    2019/05/15

  35. Valence-states of Mn and Luminescence Properties for Red-emitting Li2TiO3:Mn4+ Phosphor Prepared by Sol-gel method

    Takuya Hasegawa, Yoshinori Nishiwaki, Fumito Fujishiro, Tadaharu Ueda

    The Ceramic Society of Japan Annual Meeting 2019　2019/03/25

  36. Discovery and Design-concept for Red-emitting Oxide Phosphor Based on 5d-4f Transition Invited

    Takuya Hasegawa, Tadaharu Ueda, Kenji Toda, Mineo Sato

    Phosphor Research Society The 375th Meeting　2019/02/08

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Research Projects 4

  1. Potential-responsive Luminescence Switching Based on Layer Charge Control in 2D Multiple Oxides

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2022/04/01 - 2025/03/31

  2. Creation and construction of basic technologies of indium-free functional nanomaterials for smart windows

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2020/04/01 - 2025/03/31

  3. Development of Ce(IV) based Charge-neutral Layered Perovskite Nanosheets and Discovery of Its Photo-functionality

    Hasegawa Takuya

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tohoku University

    2020/04/01 - 2022/03/31

    More details Close

    This work aims to expand the material series of "cerium introduced layered perovskite", which has been discovered in the world first, and to express the redox property, which was not in the conventional layered perovskite. As a result, we successfully synthesized anionic [Ce(III)Ta2O7]- layer by exfoliation of the layered perovskite and succeeded in creation of charge-neutral [Ce(IV)Ta2O7] perovskite layer induced by chemically oxidization. This was achieved by drawing out the redox ability which conventional layered perovskite does not have to the maximum, and it can be said that the new material system of "redox layered perovskite" was constructed.

  4. Discovery of Eu3+-activated red-emitting phosphor using charge-transfer transition of transition metals as blue-light absorber

    Hasegawa Takuya

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    2017/04/01 - 2020/03/31

    More details Close

    This work is the development of new inorganic luminescent materials, and is aiming the development of the oxide phosphor materials to realize showing the red-emission using excitation energy between the transition metal and its ligands. In this work, the new transition-metal oxide materials, LiCa3MV3O12 (M=Mg, Zn), which show the blue emission under the near UV excitation, were discovered. Recently, many researches using this material have been actively investigated worldwide, and it is known that the materials exhibit red emission by Eu3+ doping.This study is expected to further advance the research on the emission/quenching mechanism of phosphor materials using Eu3+.