Efficient utilization of the excitation energy of highly-excited quantum dots for photoreactions
Publicly Offered Research
| Project Area | Application of Cooperative-Excitation into Innovative Molecular Systems with High-Order Photo-functions |
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| Project/Area Number |
15H01099
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Hokkaido University (2016)
National Institute of Advanced Industrial Science and Technology (2015) |
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Principal Investigator |
Biju V・Pillai 北海道大学, 電子科学研究所, 教授 (60392651)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Fiscal Year 2016: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
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| Keywords | Quantum Dots / Photochemical reactions / Singlet oxygen / Excited state / Energy Transfer / Electron Transfer / Nanoparticles / Perovskite / 量子ドット / ナノ材料 / excited state process |
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| Outline of Annual Research Achievements |
Aim of this project was to develop methods for efficient utilization of the energy of highly-excited nanoparticles (NPs) such as quantum dots (QDs) and perovskite nanocrystals (PNCs). Highly-excited NPs were generated by high-intensity laser irradiation. However, energy of such NPs is lost by ultrafast radiative and non-radiative recombination of photo-generated charge carriers. Therefore, extraction of absorbed energy towards practical applications is an important challenge. Here we developed photochemical and photophysical methods for extracting the energy of such NPs. At first, a part of the energy absorbed by QDs was extracted by activation of oxygen into singlet oxygen, which was followed by using singlet oxygen as the secondary energy source for chemical reactions. Here, we developed and used two novel singlet oxygen scavengers. Next, we applied highly-excited QDs to DNA molecules, which resulted in electron transfer from DNA to ionized QDs and formation of QD-DNA conjugates. Finally, we investigated stability of photo-generated charge carriers in highly-excited PNCs by preparation of self-assembled PNC structures. When compared with a PNC isolated in a solution, prolonged stability for photo-generated charge carriers was found for self-assembled structures, which is attributed to trapping or hopping of electrons and holes in or among PNCs. Successively, charge carriers in such PNCs were efficiently extracted by employing electron acceptors such as fullerene, which opens a method for efficient utilization of photoactivated PNCs for solar energy harvesting.
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| Research Progress Status |
28年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
28年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(35 results)
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[Presentation] Singlet Oxygen Generation by Nanoparticles: Stability Vs Oxidation2015
Author(s)
Shin-ichi Yamashita, Morihiko Hamada, Hironobu Saito, Edakkattuparambil S. Shibu, Shin-ichi Wakida, Yoshio Nosaka, Shunsuke Nakanishi, Vasudevanpillai Biju
Organizer
International Conference on Photochemistry ICP2015
Place of Presentation
Jeju Convention Center, Republic of South Korea
Year and Date
2015-06-28
Related Report
Int'l Joint Research
