Exploration and Luminescence-Property Control of Organic Polar-Crystal Materials Exhibiting Triboluminescence

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14667
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 33010:Structural organic chemistry and physical organic chemistry-related
• Research Institution: Osaka Metropolitan University
• Principal Investigator: Ogaki Takuya 大阪公立大学, 大学院工学研究科, 特任助教 (80804228)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: トリボルミネッセンス / メカノルミネッセンス / 摩擦発光 / 極性結晶 / 結晶構造 / 分子間相互作用 / エネルギー移動 / 発光

Outline of Final Research Achievements

Triboluminescence (TL) is a luminescent phenomenon induced by mechanical stimuli, and is applicable to the development of external stimuli-responsive luminescent materials without any photoexcitation. TL materials should undergo charge separation and recombination upon mechanical stimuli, and therefore, should form polar crystals. However, it has been difficult to rationally design such organic polar crystals.
To overcome the difficulty, in this work, we developed new strategies for obtaining organic TL materials based on a host-dopant system. In the system, highly-luminescent materials are doped into polar crystal host materials. Furthermore, we found that π-conjugated molecules with iodo and methoxy groups at the both molecular ends form organic polar crystals which is based on the intermolecular halogen bonding and the herringbone packing.

Free Research Field

構造有機化学

Academic Significance and Societal Importance of the Research Achievements

有機トリボルミネッセンス現象自体は古くから知られていたものの，詳細な研究があまり進んでいない研究分野であった。本研究では有機光化学と有機結晶化学の知見を生かして，有機トリボルミネッセンス材料の開発指針を明らかにできた。本研究の成果により，有機トリボルミネッセンスの機構解明や応用研究に向けて材料を提供できることに学術的および社会的な意義がある。