Development of novel spin-probe techniques for organic devices by ESR-induced currents
| Project/Area Number |
17H03135
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Device related chemistry
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| Research Institution | Osaka City University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2018: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
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| Keywords | EDMR / ODMR / 有機デバイス / ESR / スピン流 / 逆スピンホール効果 / 電子スピン共鳴 / スピントロニクス / 電流検出ESR / 電子正孔対 / 酸素 / 誘起電流 / 有機EL / 有機LED |
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| Outline of Final Research Achievements |
In this study, we developed techniques to utilize the current change that occurs when the electron spin is reversed in organic semiconductor devices. We found that the current change in OLEDs is caused by the spin reversal of electron-hole pairs. The electron-hole pairs were found to decrease with increasing voltage, and the EL process was classified into three regions depending on the voltage: the pair accumulation region, the pair dissociation/recombination region, and the non-pair formation region. It was also found that the nature of the electron-hole pairs determines the magnetic field responsivity of the OLEDs. We also investigated the electromotive force generated by ferromagnetic resonance in metal bilayer thin films, and clarified the relationship between the excitation power and the electromotive force due to the resonance.
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| Academic Significance and Societal Importance of the Research Achievements |
有機物質を代表とする半導体や導体には電子スピンをもつキャリヤやその複合体が存在しているが、そのスピンを磁気共鳴操作を用いて反転した際に素子にどのような影響が生じるか調べることは、新しいデバイスへの応用やデバイス内の物性を調べる手段を模索する意味で重要である。この研究ではその技術開拓を行うことを主眼とし、研究を行った結果、電子スピンの反転による電流変化を与える電子状態の起源を明らかにでき、さらには新たなスピン物性の開拓及び応用展開を行える手掛かりを得ることができた.
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Report
(5 results)
Research Products
(18 results)
