ON/OFF switching of photoluminescence from perovskite quantum dots

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H02570
• 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: Kumamoto University
• Principal Investigator: Kida Tetsuya 熊本大学, 大学院先端科学研究部(工), 教授 (70363421)
• Co-Investigator(Kenkyū-buntansha): 猪股 雄介 熊本大学, 大学院先端科学研究部(工), 助教 (40824024) ; 深港 豪 熊本大学, 大学院先端科学研究部(工), 教授 (80380583)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 量子ドット / フォトクロミック分子 / エネルギー移動 / 電子移動 / 蛍光発光 / 発光スイッチング材料

Outline of Final Research Achievements

Diarylethene reversibly isomerizes (changes its structure and properties) between a colorless open ring and a colorful closed ring upon external photostimulation. Here, we synthesized hybrids of diarylethene bound to the surface of CsPbBr3 nanocrystals and switched the emission of the nanocrystals on and off using the reversible color change (absorbance change) of diarylethene upon light stimulation. Femtosecond pump-and-probe spectroscopy of the resulting hybrids revealed fast electron and energy transfer from the nanocrystal to the closed-ring diarylethene, which contributed to the formation of the non-luminescent (Off) state. On the other hand, hybrids consisting of CsPbBr3 nanocrystals and ring-opened diarylethenes did not exhibit this phenomenon and maintained a high luminescent (On) state. The On state was reversibly switched between the On and Off states by alternating UV and visible light irradiation, and exhibited a high On/Off intensity ratio.

Free Research Field

無機材料化学

Academic Significance and Societal Importance of the Research Achievements

本研究によって、ペロブスカイトCsPbBr3量子ドット、ジアリールエテン、TEMPOを組み合わせることで安定な発光スイッチング材料の開発に成功した。さらに時間分間分光法によってそのメカニズムを解明することができた。今後、これらの知見を活かして固体状態でスイッチする光材料を開発することで、超解像イメージング用の発光プローブやナノ光メモリなどの記録媒体への応用が期待できる。