Development of advanced liquid-phase synthesis of carbon dots with controlled photoluminescence properties

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22236
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: Keio University
• Principal Investigator: Isobe Tetsuhiko 慶應義塾大学, 理工学部(矢上), 教授 (30212971)
• Co-Investigator(Kenkyū-buntansha): 磯 由樹 慶應義塾大学, 理工学部(矢上), 講師 (00769705)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: 蛍光 / 蛍光ソルバトクロミズム / カーボンドット / フェニレンジアミン / フロログルシノール / 量子ドット / 液相合成 / 表面修飾

Outline of Final Research Achievements

Recently, quantum dots (QDs), which emit light in the band gap and whose emission color can be tuned by controlling particle size through the quantum size effect, have emerged. CdSe, InP, and CsPbBr3 have been developed as QD materials; however, they have problems in terms of toxicity and stability. Against this background, light-emitting materials with high environmental friendliness are required; therefore, we focused on the preparation of luminescent carbon dots (CDs) from abundant carbon sources. In this work, we pioneered an advanced liquid-phase method to synthesize CDs by polymerizing aromatic compound materials in non-aqueous solvents. Furthermore, the effects of surface modification and surrounding environment on the luminescence properties were investigated to control them.

Free Research Field

ナノ蛍光体材料

Academic Significance and Societal Importance of the Research Achievements

本研究より、フェニレンジアミンやフロログルシノールなどの芳香族化合物原料を高沸点有機溶媒中で加熱して重合することによってCDsを合成できることを明らかにした。これらのCDsは表面修飾や周囲環境によって双極子相互作用を制御して蛍光エネルギーを調節できることを実証した。以上より、従来の毒性元素を含む量子ドットの次の時代を担うことが期待される環境親和性のあるナノ蛍光体材料を開発した点で、本研究は学術的にも社会的にも重要な意義をもつ。