RIES
Research Institute for Electronic Science, Hokkaido University
北海道大学
電子科学研究所

LAST UPDATE 2021/06/07
-
研究者氏名
Researcher Nameビジュ・ヴァスデヴァン・ピライ BIJU Vasudevan Pillai
教授 professor -
所属
Professional Affiliation北海道大学電子科学研究所
物質科学研究部門 分子フォトニクス研究分野
Research Institute for Electronic Science, Hokkaido University
Material and Molecular Sciences, Laboratory of Molecular Photonics -
研究キーワード
Research Keywords
Photochemistry
Physical Chemistry
Semiconductor Nanoparticles and Quantum Dots
Single-molecules
Electron and energy transfer
Molecular Sensors
- 研究テーマ
Research Subject -
Fluorescent Nanomaterials, Quantum Dots, and Molecules
研究の背景 Background
Metal chalcogenide quantum dots and metal halide perovskite nanomaterials emerge as a promising and cost-effective class of semiconductors for next-generation photoluminescent, electroluminescent and photovoltaic devices. These nanomaterials own high optical absorption coefficients and narrow-band bright photoluminescence, which are in addition to the composition-and size-dependent tunable bandgap, exciton binding energy, and carrier diffusion. However, these materials show photobleaching or stochastic fluctuations in their luminescence due to electronics/ionic defects and photo-charging. Therefore, it is essential to classify the origins of the blinking and bleaching processes and develop high-quality quantum optical materials.
研究の目標 Outcome
Semiconductor quantum dots, nanocrystals, and microcrystals with stable photoluminescence and electroluminescence are developed by synthesizing these nanomaterials, analyzing their photoluminescence properties at the single-particle level, and passivating ionic and electronic defects. Random charging, blinking, and bleaching of metal chalcogenide quantum dots are suppressed by photoinduced electron transfer from molecular donors. Conversely, the photoluminescence and electroluminescence properties of halide perovskite quantum dots, nanocrystals, and microcrystals are optimized by real-time halide vacancy filling and light-soaking. Thus, by combining materials synthesis and optical studies with physicochemical modification of the structure and properties, this research develops highly luminescent semiconductor materials.
研究図Research Figure

Fig.2. Bromide and iodide perovskite quantum dots with photoluminescence optimized by halide vacancy filling.
文献 / Publications
L. Chouhan, S. Ito, E. M. Thomas, Y. Takano, S. Ghimire, H. Miyasaka, V. Biju, ACS Nano 2021, 15, 2831. E. M. Thomas, S. Ghimire, R. Kohara, A. N. Anil, K. Yuyama, Y. Takano, K. G. Thomas, V. Biju, ACS Nano 2018, 12, 9060.
研究者HP
- biju
es.hokudai.ac.jp
- http://bijulab.main.jp/en/