Thermo-responsive imaging media enabling reversible switching of its emission with high high invisibility

2014 Fiscal Year Final Research Report

• Project/Area Number: 25870137
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Organic and hybrid materials; Device related chemistry
• Research Institution: Chiba University
• Principal Investigator: NAKAMURA Kazuki 千葉大学, 融合科学研究科(研究院), 助教 (00554320)
• Co-Investigator(Renkei-kenkyūsha): KOBAYASHI Norihisa 千葉大学, 大学院融合科学研究科, 教授 (50195799) ; UEMURA Sei 産業技術総合研究所, フレキシブルエレクトロニクス研究センター, 研究員 (50392593)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 発光スイッチング / サーモクロミズム / 励起エネルギー移動 / フルオラン色素

Outline of Final Research Achievements

We aimed fabrication of photo functional material enabling thermo-responsive switching of photoluminescence under irradiation of UV light. For the purpose of the security application, high invisibility under visible light is required, i.e. absorption change of the material during emission switching should be suppressed.
Photo-functional polymeric films were fabricated by using thermochromic fluoran dyes, its developer, and luminescent molecules. The emission of this composite film could be reversibly changed and maintained via the thermochromic reaction taking placing within the fluoran dye-developer system. However, the color changes during emission switching was still large. Therefore, we investigated the emission switching using various fluoran molecules and emission molecules. As the result, the emission switching were achieved with lower absorption change.

Free Research Field

光化学、電気化学、錯体化学、画像形成材料