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Atomic level structural control and characterisation of perovskite quantum dots

Research Project

Project/Area Number 22KJ0994
Project/Area Number (Other) 22J15607 (2022)
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeMulti-year Fund (2023)
Single-year Grants (2022)
Section国内
Review Section Basic Section 34010:Inorganic/coordination chemistry-related
Research InstitutionThe University of Tokyo

Principal Investigator

シュヴァリエ オリビエ  東京大学, 理学系研究科, 特別研究員(DC2)

Project Period (FY) 2023-03-08 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2023: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2022: ¥900,000 (Direct Cost: ¥900,000)
KeywordsPerovskite / Nanoclusters / Quantum dots / Quasi-melting / TEM / Nanocluster / Blue LED
Outline of Research at the Start

In this project, we investigate the effect of size confinement and atomic agitation on the properties of perovskite nanocrystals by synthesizing size-controlled sub-2.5 nm clusters of various sizes.

Outline of Annual Research Achievements

In this year, I successfully synthesized sub-2 nm lead halide perovskite nanocrystals with precise size control. I studied the size-dependence of the clusters' properties and demonstrated how the smallest clusters showed increased vibrations and increased disorder, which in turn lead to decreased optical properties. Specifically, the fluorescence quantum yield and fluorescence lifetimes sharply decreased when reducing the size from 2.4 nm to 1.2 nm. In line with quantum confinement effects, the wavelength was also shown to decrease sharply. By using transmission electron microscopy imaging with atomic resolution and a 3 ms temporal resolution, I showed that the increased disorder in smaller clusters was consistent with quick quasi-melting transitions accessible at room temperature. I demonstrated how the internal structure of the clusters, with crystallographic defects such as twinning stabilized the clusters and increased their melting point. Similarly, caesium-based structures also showed an increased melting point and increased structural rigidity, compared to methylammonium-based clusters, in line with their heightened stability. Future plans involve expanding this study to larger (10 nm) perovskite nanocrystals and investigate the temperature dependence of the quasi-melting equilibrium.

Report

(2 results)
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • Research Products

    (7 results)

All 2023 2022

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (6 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Precision Synthesis and Atomistic Analysis of Deep-Blue Cubic Quantum Dots Made via Self-Organization2022

    • Author(s)
      Chevalier Olivier J. G. L.、Nakamuro Takayuki、Sato Wataru、Miyashita Satoru、Chiba Takayuki、Kido Junji、Shang Rui、Nakamura Eiichi
    • Journal Title

      Journal of the American Chemical Society

      Volume: 144 Issue: 46 Pages: 21146-21156

    • DOI

      10.1021/jacs.2c08227

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] Between molecules and nanocrystals: synthesis and properties of perovskite nanoclusters2023

    • Author(s)
      O. Chevalier, T. Nakamuro, N. Yoshikawa, R. Shimano, R. Shang and E. Nakamura
    • Organizer
      103rd Chemical Society of Japan annual meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Citric Acid enabled synthesis of ultrasmall lead perovskite clusters2023

    • Author(s)
      O. Chevalier, T. Nakamuro, N. Yoshikawa, R. Shang, R. Shimano and E. Nakamura
    • Organizer
      28th French-Japanese Symposium on Medicinal and Fine Chemistry
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Between molecules and nanocrystals: synthesis and properties of perovskite nanoclusters2023

    • Author(s)
      O. Chevalier, T. Nakamuro, N. Yoshikawa, R. Shimano, R. Shang and E.
    • Organizer
      103rd Chemical Society of Japan annual meeting
    • Related Report
      2022 Annual Research Report
  • [Presentation] Polycarboxylates as synthetic tools for small and efficient perovskite quantum dots2022

    • Author(s)
      O. Chevalier, T. Nakamuro, R. Shang and E. Nakamura
    • Organizer
      ACS San Diego Spring 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Atomic precision synthesis and characterization of perovskite quantum dots for blue light emitting diodes2022

    • Author(s)
      O. Chevalier, T. Nakamuro, R. Shang and E. Nakamura
    • Organizer
      102nd Chemical Society of Japan annual meeting
    • Related Report
      2022 Annual Research Report
  • [Presentation] Precision synthesis and atomistic analysis of deep-blue cubic quantum dots made via self-organization2022

    • Author(s)
      O. Chevalier, T. Nakamuro, S. Wataru, S. Miyashita, T. Chiba, J. Kido, R. Shang and E. Nakamura
    • Organizer
      12th CSJ Chemistry Festa
    • Related Report
      2022 Annual Research Report

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Published: 2022-04-28   Modified: 2024-12-25  

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