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Arimitsu Lab
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An organic materials chemistry lab that amplifies functions triggered by light and heat.
AboutAbout the lab
Amplifying light-induced functions through reactions
The Arimitsu Lab studies organic materials chemistry, focusing on functions that appear in response to stimuli such as light and heat, and on amplifying those functions.
The lab designs and synthesizes a variety of functional organic molecules and polymers and evaluates their functions; every member handles everything from organic synthesis to applications in functional materials.
One line of research is developing highly sensitive photopolymers by multiplying, through reactions, the acids and bases generated by light.
The lab also actively accepts joint research with companies.
Key terms
- Photobase generator
- A compound that generates a base (an alkaline molecule) when exposed to light
- Base proliferation reaction
- An autocatalytic reaction in which a compound decomposes under the action of a base catalyst and releases a new base molecule
- Photopolymer
- A polymer material that reacts when exposed to light. A functional polymer essential to the electronics industry
NewsLab news
Research results published in ACS Macro Lett.
Research results published in Macromolecules
Research results published in Macromolecules
Research results published in J. Polym. Sci.
Research results published in ACS Appl. Polym. Mater.
ResearchResearch themes
The Arimitsu Lab studies organic materials chemistry, focusing on functions that appear in response to stimuli such as light and heat, and on amplifying those functions. Focusing on functions that emerge only when photochemistry, organic chemistry, and polymer science work together, the lab designs and synthesizes functional organic molecules and polymers and evaluates their functions.
*Illustrative imageCascade Chemistry Linking Reactions
The lab works on "cascade chemistry," which links multiple chemical reactions to amplify the initial change. If the first step is a photochemical reaction, a slight change caused by light can be amplified thermochemically, and the lab expects this to enable ultra-high sensitivity in photoreactive materials.
*Illustrative imageDevelopment of Highly Efficient Photoinitiators
Photopolymers are evolving from the conventional "one photon, one chemical reaction" type to a "one photon, many thermochemical reactions" type. The latter works on the principle of generating an acid or base with light and using it as a catalyst to trigger polymer reactions, and the lab researches and develops the highly efficient photoinitiators used here.
*Illustrative imageDevelopment of Base Proliferation Reactions
An autocatalytic reaction in which a compound decomposes under the action of a base catalyst and releases a new base molecule is called a base proliferation reaction. Prof. Arimitsu and colleagues were the first in the world to discover this reaction, and the lab researches and develops a variety of base proliferators that cause it.
*Illustrative imageDevelopment of Base-Proliferating Photopolymers
Combining a photobase generator with a base proliferation reaction can secondarily increase the concentration of the base generated by light, enabling dramatically higher sensitivity. The lab researches and develops a variety of materials, such as photoresists and UV-curing materials.
MembersFaculty
The Arimitsu Lab consists of faculty members, a visiting professor, a secretary, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorKoji Arimitsu
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “UV LED Machine” Carin Baars / CC BY-SA 4.0 (cropped)
- Cascade Chemistry Linking Reactions: “Chemistry Laboratory ( )” U.S. Army RDECOM from Aberdeen Proving Ground, MD, USA / CC BY 2.0 (cropped)
- Development of Highly Efficient Photoinitiators: “Sheets-emerge-from-the-UV-curing-lamps” Ligonauer / CC BY-SA 4.0 (cropped)
- Development of Base Proliferation Reactions: “Light Amplification by Stimulated Emission of Radiation” 彭嘉傑 at Chinese Wikipedia / CC BY-SA 3.0 (cropped)
- Development of Base-Proliferating Photopolymers: “Light setting dental material” Niomno / CC BY 3.0 (cropped)
- Related lab (郡司・山本研究室): “Rated-viscosity silicone oils - силиконовые масла нормрованной вязкости” Retired electrician / CC0 (cropped)
- Related lab (酒井秀樹・酒井健一研究室): “Polysorbate 80 Food additive E433” Radiotrefoil / CC BY-SA 4.0 (cropped)
- Related lab (中山研究室): “Phosphor rot” Tomihahndorf / Public domain (cropped)
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