Development of giant-shell quasi-type-II core-shell quantum dot scintillators

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K18612
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 14:Plasma science and related fields
• Research Institution: Shizuoka Institute of Science and Technology (2022); Tohoku University (2021)
• Principal Investigator: Tsukuda Satoshi 静岡理工科大学, 理工学部, 准教授 (00451633)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: 量子ドット / シンチレータ / コアシェル構造

Outline of Final Research Achievements

Semiconductor quantum dots can be tuned the emission wavelength by the quantum size effect. It is also known that core-shell quantum dots, in which a quantum dot is covered with another semiconductor, exhibit a high photoluminescence quantum yield. In this study, we have developed a highly efficient scintillator material based on core-shell quantum dots. In particular, we focused on the quasi-Type-II core-shell structure. CdSe/CdS core-shell quantum dots with thick shells were synthesized. The quasi-Type-II quantum dots exhibit the radiation absorption at the shell and emission from the core part, instead of completing radiation absorption and emission in the core as in the Type-I.

Free Research Field

ナノ材料科学

Academic Significance and Societal Importance of the Research Achievements

巨大シェル準Type-IIコアシェル量子ドットは、既存の量子ドットとは異なり、吸収と発光を空間的に分離したシンチレーション機構を示すため、高効率のシンチレータ材料の開発が期待できる。また、ナノ材料であるため、プラスチックシンチレータに混ぜ込むなどの加工の容易さや、放射線がん治療でのリアルタイムモニタリングなどの生体内での利用と極めて汎用性の高い材料である。そのため応用展開は、正確な放射線計測技術の需要が高い環境、医療、食品など他分野に広がっているため、本研究成果の波及効果は非常に高い。