2023 Fiscal Year Final Research Report
Photoinduced macroscopic polarization change with long-lived metastable state
| Project/Area Number |
21K05085
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 34010:Inorganic/coordination chemistry-related
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| Research Institution | Kyushu University |
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Principal Investigator |
SU SHENGQUN 九州大学, 先導物質化学研究所, 学術研究員 (90817496)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | spin transition / electron transfer / magnetic change / polarization change / electric current / light |
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| Outline of Final Research Achievements |
To realize photo-induced macroscopic polarization change with current output during the relaxation process from excited state to the ground state. We focused on the spin crossover complexes with Light-Induced Excited Spin-State Trapping effect (LIESST) and Prussian blue analogues with photo-induced electron-transfer-coupled spin transition (ETCST) process. We have obtained a polar Fe(II) spin crossover complex exhibited LIESST effect, in which 28% of Fe(II) changes from the low spin state of the ground state to the high spin state of the excited state after photoexcitation. When the excited state returned to the ground state, the current was detected. Then, we developed a trinuclear [Fe2Co] Prussian blue analogue with 100% conversion from ground state to excited state in response to the light irradiation. During this process, the output current was observed. This study will benefit the development of multifunctional optoelectronic materials and energy conversion materials.
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| Free Research Field |
coordination chemistry
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| Academic Significance and Societal Importance of the Research Achievements |
This study combined the photo-responsive molecular magnetic materials and polar molecular crystals realizing the conversion of light energy to electrical energy. It paves the way to develop opto-electric multifunctional materials, next generation memories and energy saving and conversion materials.
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