2018 Fiscal Year Final Research Report
Multiexciton Dynamics in Semiconductor Nanoparticles and their Application to Photoresponsive Systems
Project Area | Application of Cooperative-Excitation into Innovative Molecular Systems with High-Order Photo-functions |
Project/Area Number |
26107005
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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 |
Review Section |
Science and Engineering
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Research Institution | Kwansei Gakuin University |
Principal Investigator |
TAMAI Naoto 関西学院大学, 理工学部, 教授 (60163664)
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Co-Investigator(Kenkyū-buntansha) |
増尾 貞弘 関西学院大学, 理工学部, 教授 (80379073)
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Research Collaborator |
KATAYAMA Teturo
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Project Period (FY) |
2014-07-10 – 2019-03-31
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Keywords | 半導体ナノ微粒子 / 励起子素過程 / ハイブリッド / ホットキャリア移動 / 光スイッチング / フェムト秒分光 / プラズモン / 単一微粒子分光 |
Outline of Final Research Achievements |
Various quantum confined semiconductor nanoparticles (SNPs) such as quantum dots (QDs), nanorods (NRs), and nanoplatelets (NPLs) were synthesized and their exciton dynamics were examined by state-selective fs transient absorption spectroscopy and ps luminescence spectroscopy. The efficient and ultrafast carrier transfer from band-edge state and higher excited state (hot carrier transfer) were observed in SNPs-acceptor systems, and the correlation between carrier transfer and the structure of SNPs was revealed. By attaching a photochromic molecule to SNPs, efficient optical switching of SNPs luminescence was demonstrated. In addition, multiexciton dynamics followed by laser oscillation in single perovskite microcrystals were examined by fs transient absorption microscopy. Furthermore, single and multiexciton luminescence from a single QD were successfully controlled by AFM manipulation and plasmonic nanostructures.
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Free Research Field |
光物理化学
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Academic Significance and Societal Importance of the Research Achievements |
SNPsの励起子素過程と量子閉じ込めの次元性・構造との関係を明らかにする事は,SNPsの発光素子や光電変換素子などへの応用において基盤となる知識を与えるものである。特に,SNPsを利用した高励起状態からのホットキャリア移動を利用すると,従来のバルク半導体を利用した太陽電池の光電変換効率限界30%(Shockley- Queisser限界)を大幅に超える高効率太陽電池が作製可能と考えられる。更に,SNPsの発光スイッチングは超解像顕微鏡技術への応用として,プラズモンを用いた単一SNPの単一発光・多光子発光の精密制御は光通信等の基盤技術として重要であり,本研究の学術的・社会的意義は大きい。
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