New molecular frameworks - from biocompatible near-infrared absorbing dyes to organic thin-film solar cells.
Nanotechnology (Saitama University Research Seed Collection 2025-25 p.110)
Keywords: functional dyes, near-infrared absorbing dyes, bio-specific binding dyes, organic thin-film solar cells, dye film formation
Colors have captivated people since ancient times, such as Cleopatra's purple garments, which symbolized power, and the scarlet robes of Japanese monks. Today, vibrant colors abound in various settings, and the development of new structural frameworks for pigments is both fascinating and profound, with ongoing vigorous research. In recent years, the development of pigments has expanded beyond merely dyeing fabrics to include applications in a wide range of fields, such as pigments usable within living organisms and those for electronic device materials. Our research focuses on the following two themes: - Synthesis of compounds that absorb in the near-infrared region We are developing pigments that absorb in the near-infrared region, not only for use as dyes in electronic devices but also as biological imaging dyes. Furthermore, we are also expanding into luminescent pigments, in addition to absorption. - Synthesis of dyes for organic thin-film solar cells We are developing dyes for organic thin-film solar cells from the perspective of renewable energy. This includes the development of donor-acceptor type long-wavelength absorbing dyes for efficient use of indoor light. We believe that proposing new pigment frameworks is essential.
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Yudai Ishimaru, Associate Professor Graduate School of Science and Technology, Department of Materials Science, Field of Material Functions 【Recent Research Themes】 ● Synthesis and functional evaluation of anti-aromatic compounds ● Creation of self-healing polymer compounds ● Development of phthalocyanine metal complexes for color filters ● Creation of distorted π-conjugated systems ● Synthesis and optical functional evaluation of novel metal complexes
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【Appeal Points to the Industry】 ● Molecular design and synthesis skills for functional colorants suitable for specific applications ● Rapid structural analysis and physical property evaluation of compounds centered around the Scientific Analysis Support Center ● Separation and purification techniques from organic solvent systems to aqueous systems ● Molecular flask library (stabilization of compounds in aqueous systems, drugs, coenzyme Q10, etc.) ● Numerous patent applications filed 【Examples of Practical Application, Use Cases, and Utilization】 ● Development of functional colorants aimed at long-wavelength extension into the near-infrared region ● Development of fullerene pharmaceuticals through fullerene modification ● Development of interface control molecules for organic thin-film solar cells ● Fabrication of ternary organic thin-film solar cells ● Research on catalysts for the photodecomposition of water
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Donor-acceptor type long-wavelength absorbing dye developed
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.