Studies on degradation and durability of Cd-free quantum dot solutions, films, and LEDs

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02556
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 28030:Nanomaterials-related
• Research Institution: Hiroshima University
• Principal Investigator: Saitow Ken-ichi 広島大学, 自然科学研究支援開発センター, 教授 (80302579)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 量子ドット / ナノ粒子 / 半導体 / シリコン

Outline of Final Research Achievements

Quantum dots are called next generation optoelectrical materials, and televisions and tablets have recently appeared on the market. However, there are two issues for further implementation. Namely, i) principal quantum dots involve heavy metals such as cadmium. 2) there are few studies on the degradation and durability. Under these situations, in the past 17 years of research, we have developed silicon (Si) quantum dots that emit three primary colors, Si quantum dots that emit white light, and Si quantum dot LEDs that emit blue-white light. In this project research, we synthesized Si quantum dots with different surface structures, and clarified the factors of deterioration of Si quantum dot solutions and Si quantum dot devices and the physical properties and structures necessary for improving durability. In the future, we will develop Cd-free quantum dots with a view to practical application.

Free Research Field

物質・材料科学

Academic Significance and Societal Importance of the Research Achievements

本研究では，表面構造や被覆率の異なるSi量子ドットを合成した。次に，これらのSi 量子ドット溶液，Si 量子ドットフィルム，Si 量子ドット LEDにおいて，それぞれの光物性や構造の変化を追跡した。得られた結果から，量子ドットの状態，物性の変化を数値化した。特に，3種類の方法で，３つの異なる発光波長（青・赤・緑）で発光するシリコン量子ドットの合成に成功した。また，それを用いた光デバイスの作製を行うことができた。