| 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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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | spin transition / electron transfer / magnetic change / polarization change / electric current / light / photoexcitation / charge transfer / ion displacement / photo effect |
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| Outline of Research at the Start |
We propose an approach towards light-induced polarization switching in a single crystal of spin crossover complexes with light-induced excited spin-state trapping effect, in which long-lived metastable states with different polarization can be generated by direct excitation upon irradiation with suitable light. Moreover, we expect to identify the differences in the chemical and electronic structures between ground states and excited states for unraveling the mechanism of this process. This project will also pave the way towards highly efficient energy conversion from light to electricity.
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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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| 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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