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Kiyoshi Miyata Last modified date:2023.11.27

Associate Professor / Inorganic/Analytical Chemistry
Department of Chemistry
Faculty of Sciences


Graduate School
Undergraduate School


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Homepage
https://kyushu-u.elsevierpure.com/en/persons/kiyoshi-miyata
 Reseacher Profiling Tool Kyushu University Pure
http://www.chem.kyushu-univ.jp/Spectrochem/member-en/
Academic Degree
PhD of Science
Country of degree conferring institution (Overseas)
No
Field of Specialization
Physical Chemistry, Electron dynamics, Ultrafast spectroscopy
ORCID(Open Researcher and Contributor ID)
https://orcid.org/0000-0001-6748-1337
Total Priod of education and research career in the foreign country
02years10months
Outline Activities
The researcher is interested in photo-carrier dynamics in organic solids or organic-inorganic semiconductors using ultrafast spectroscopy.
Research
Research Interests
  • Elucidation of mechanisms of photoinduced chemical processes using metal complexes
    keyword : Artificial photosynthesis
    2019.04.
  • Exciton dynamics in lanthanide metal/ions
    keyword : lanthanide
    2018.04.
  • Structural dynamics of thermally assisted delayed fluorescence molecules
    keyword : Thermally Assisted Delayed Fluorescence
    2018.02.
Academic Activities
Reports
1. Kiyoshi Miyata, Felisa S. Conrad-Burton, Florian L. Geyer, X.-Y. Zhu, Triplet Pair States in Singlet Fission, Chemical Reviews, 10.1021/acs.chemrev.8b00572, 2019.02, [URL], 一重項励起子分裂(シングレットフィッション)は励起された一重項励起子状態が二つのトリプレット状態に分裂する過程である。この過程にはいまだに理解されていない部分が多くあり、中でも中間状態であるトリプレット対状態はその重要性を大きく見過ごされていた。このレビューではトリプレット対状態の重要性にフォーカスし、現時点での理解を整理することで業界がこれから追求すべき方向性の一つを明確に提示している。.
Papers
1. S. Miyazaki, K. Goushi, Y. Kitagawa, Y. Hasegawa, C. Adachi, K. Miyata, K. Onda, Highly efficient light harvesting of a Eu(iii) complex in a host–guest film by triplet sensitization, Chemical Science, 10.1039/D3SC01817B , 2023.06.
2. Raj Kumar Koninti, Kiyoshi Miyata, Masaki Saigo, Ken Onda, Achieving Thermally Activated Delayed Fluorescence from Benzophenone by Host–Guest Complexation, J. Phys. Chem. C, 10.1021/acs.jpcc.1c04283, 2021.08.
3. Yusuke Kawashima, Tomoyuki Hamachi, Akio Yamauchi, Koki Nishimura, Yuma Nakashima, Saiya Fujiwara, Nobuo Kimizuka, Tomohiro Ryu, Tetsu Tamura, Masaki Saigo, Ken Onda, Shunsuke Sato, Yasuhiro Kobori, Kenichiro Tateishi, Tomohiro Uesaka, Go Watanabe*, Kiyoshi Miyata*, Nobuhiro Yanai, Singlet fission as a polarized spin generator for biological nuclear hyperpolarization, Nature Communications, 14, 1056, 2023.01, Singlet fission (SF), converting a singlet excited state into a spin-correlated triplet-pair state, is an effective way to generate a spin quintet state in organic materials. Although its application to photovoltaics as an exciton multiplier has been extensively studied, the use of its unique spin degree of freedom has been largely unexplored. Here, we demonstrate that the spin polarization of the quintet multiexcitons generated by SF improves the sensitivity of magnetic resonance of water molecules through dynamic nuclear polarization (DNP). We form supramolecular assemblies of a few pentacene chromophores and use SF-born quintet spins to achieve DNP of water-glycerol, the most basic biological matrix, as evidenced by the dependence of nuclear polarization enhancement on magnetic field and microwave power. Our demonstration opens a use of SF as a polarized spin generator in bio-quantum technology..
4. Yuushi Shimoda, Kiyoshi Miyata, Masaki Saigo, Youichi Tsuchiya, Chihaya Adachi, Ken Onda, Intramolecular-rotation driven triplet-to-singlet upconversion and fluctuation induced fluorescence activation in linearly connected donor–acceptor molecules, The Journal of Chemical Physics, 10.1063/5.0029608, 153, 204702, 2020.11, [URL], 熱活性化遅延蛍光(TADF)の設計は、ESTを小さくするために遷移が関わる軌道の重なりを小さくしなければならないが、発光特性の観点からは重なりを大きくする必要があり本質的な矛盾が内在している。ドナー‐アクセプター型のTADF材料のDA二面角揺らぎを制御した分子に対する時間分解赤外分光と量子化学計算により励起状態での構造変化の比較検討を元に、二面角揺らぎがこの矛盾を解決する糸口になり得ると提案した。.
5. Shiori Miyazaki;Kiyoshi Miyata;Haruna Sakamoto;Fumiya Suzue;Yuichi Kitagawa;Yasuchika Hasegawa;Ken Onda, Dual Energy Transfer Pathways from an Antenna Ligand to Lanthanide Ion in Trivalent Europium Complexes with Phosphine-Oxide Bridges, The Journal of Physical Chemistry A, 10.1021/acs.jpca.0c02224, 124, 6601-6606, 2020.07, [URL].
6. Kiyoshi Miyata, Ryota Nagaoka, Masaki Hada, Takanori Tanaka, Ryuji Mishima, Taihei Kuroda, Sota Sueta, Takumi Iida, Yoshifumi Yamashita, Takeshi Nishikawa, Kenji Tsuruta, Yasuhiko Hayashi, Ken Onda, Toshihiko Kiwa, Takashi Teranishi, Liquid-like dielectric response is an origin of long polaron lifetime exceeding 10 μ s in lead bromide perovskites, The Journal of Chemical Physics, 10.1063/1.5127993, 152, 8, 084704, 2020.02.
7. , [URL].
8. Miyata, Kiyoshi; Zhu, X. -Y., Ferroelectric large polarons, NATURE MATERIALS, 10.1038/s41563-018-0068-7, 17, 5, 379-381, 2018.05, オプトエレクトロニクスで非常に重要な位置づけとなっている新規材料鉛ハライドペロブスカイトについて、その特異な電子物性を理解する鍵として強誘電材料としても側面を議論した論文。印加された電場に対して非常に大きく応答できる高誘電率といった性質から、注入されたキャリアが周囲に微視的な強誘電相転移を誘起する可能性について言及し、Ferroelectric polaronという全く新しい概念を提唱した。.
9. Miyata, Kiyoshi; Atallah, Timothy L.; Zhu, X. -Y., Lead halide perovskites: Crystal-liquid duality, phonon glass electron crystals, and large polaron formation, SCIENCE ADVANCES, 10.1126/sciadv.1701469, 3, 10, 2017.10.
10. Miyata, Kiyoshi; Kurashige, Yuki; Watanabe, Kazuya; Sugimoto, Toshiki; Takahashi, Shota; Tanaka, Shunsuke; Takeya, Jun; Yanai, Takeshi; Matsumoto, Yoshiyasu, Coherent singlet fission activated by symmetry breaking, NATURE CHEMISTRY, 10.1038/NCHEM.2784, 9, 10, 983-989, 2017.10.
11. Miyata, Kiyoshi; Meggiolaro, Daniele; Trinh, M. Tuan; Joshi, Prakriti P.; Mosconi, Edoardo; Jones, Skyler C.; De Angelis, Filippo; Zhu, X. -Y., Large polarons in lead halide perovskites, SCIENCE ADVANCES, 10.1126/sciadv.1701217, 3, 8, 2017.08.
12. Zhu, Haiming; Miyata, Kiyoshi; Fu, Yongping; Wang, Jue; Joshi, Prakriti P.; Niesner, Daniel; Williams, Kristopher W.; Jin, Song; Zhu, X. -Y., Screening in crystalline liquids protects energetic carriers in hybrid perovskites, SCIENCE, 10.1126/science.aaf9570, 353, 6306, 1409-1413, 2016.09.
13. Miyata, Kiyoshi; Tanaka, Shunsuke; Ishino, Yuuta; Watanabe, Kazuya; Uemura, Takafumi; Takeya, Jun; Sugimoto, Toshiki; Matsumoto, Yoshiyasu, Microscopic hole-transfer efficiency in organic thin-film transistors studied with charge-modulation spectroscopy, PHYSICAL REVIEW B, 10.1103/PhysRevB.91.195306, 91, 19, 2015.05.
Presentations
1. Kiyoshi MIYATA , Exploring the correlation among electron-phonon-spin degree of freedom in advanced molecular optoelectronics
, Recent progress in Developing Advanced Luminescent Materials, Aggregate webinar, 2023.03.
2. Kiyoshi MIYATA, Yuushi SHIMODA, Kei KAMOGAWA, Yasuomi YAMAZAKI, Yusuke TAMAKI, Osamu ISHITANI, Takumi EHARA, Teruyuki HONDA, Ren SATO, Yusuke KURAMOCHI, Akiharu SATAKE, Ken ONDA, Application of ultrafast spectroscopy to understand CO2 reduction mechanisms of photosensitizer-catalyst dyad molecular systems, Coordination Chemistry Symposium “New directions in the use of light and coordination compounds for CO2 reduction, 2022.09.
3. Kiyoshi Miyata, Shiori Miyazaki, Motoaki Gotanda, Kanji Sugioka, Yuichi Kitagawa, Yasuchika Hasegawa, Ayumi Ishii and Ken Onda, Tracking Energy Transfer Processes in Rare Earth Luminescent Materials using Ultrafast Spectroscopy, IUMRS-ICYRAM2022, 2022.08.
4. Kiyoshi MIYATA, Teruyuki HONDA, Takumi EHARA, Ren SATO, Yusuke KURAMOCHI, Akiharu SATAKE, Ken ONDA, Tracking initial processes of CO2 photoreduction in Zn(II) Porphyrin-Re(I) dyad photocatalyst using ultrafast spectroscopy
, ICSM2022, 2022.07.
5. Kiyoshi Miyata, Ken Onda, Direct observation of ultrafast structural dynamics of emergent materials for optoelectronics, The 11th Asian Conference on Ultrafast Phenomena, 2020.01, [URL].
6. Kiyoshi Miyata, Masaki Saigo, Yuushi Shimoda, Hajime Nakanotani, Chihaya Adachi, Yuki Kurashige, Kazuya Watanabe, Yoshiyasu Matsumoto, Ken Onda, Real-time observation of concerted electron-phonon dynamics in organic materials for optoelectronics, CEMS topical meeting on Organic Photoelectronics, 2019.07, [URL].
7. Kiyoshi Miyata, Probing electron-phonon couplings in organic semiconductors using static/time-resolved spectroscopy, The 3rd symposium of Frontier of Organic Semiconductor Laser, 2019.01.
Membership in Academic Society
  • The Rare Earth Society of Japan
  • The Physical Society of Japan
  • The Material Research Society
  • The Chemical Society of Japan
  • Japan OLED Forum
  • The Japan Society of Applied Physics
  • The Spectroscopical Society of Japan
  • Japan Society for Molecular Science
Educational
Educational Activities
・Mentor of the students in the Spectrochemisty lab.
・Lecturer at Basic operation of Chemistry experiment
・Lecturer of General Chemistry