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Ishii Lab
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The lab creates materials and devices that turn invisible light into usable light.
AboutAbout the lab
Turning invisible light into usable light
The Ishii Lab studies how to convert light that cannot be seen by the eye into useful light and electricity.
Using materials that combine inorganic nanocrystals with organic molecules, the lab detects and converts light that is difficult to use, such as near-infrared light and polarized light.
By turning the information carried by invisible light into usable information, the lab aims to improve the efficiency with which light is used.
Key terms
- Near-infrared light
- Light with a longer wavelength than visible light, which cannot be seen by the naked eye
- Upconversion
- A phenomenon in which weak light is absorbed and re-emitted as stronger light with a shorter wavelength
- Circularly polarized light
- Light with a special property: its wave travels while twisting either clockwise or counterclockwise
NewsLab news
A master's student received the Excellent Poster Award at the symposium "Molecular Chirality 2026"
A paper from a collaborative study was published in ACS Photonics
A master's student received the Student Presentation Award at the 42nd Rare Earth Research Conference
A master's student received the Yoshiro Sekine Award of the Department of Chemistry and Biochemistry
A master's student received the Poster Award at The 2nd RIST International Symposium
ResearchResearch themes
The Ishii Lab creates materials that can detect and manipulate the information carried by invisible light, with the aim of applying them to photoelectronics. Combining inorganic nanocrystals with organic molecules, the lab studies the detection and conversion of near-infrared light and polarized light.
*Illustrative imageConverting near-infrared light into visible light
The lab is developing upconversion nanoparticles that convert faint, invisible near-infrared light into visible light.
*Illustrative imageThin films that detect circularly polarized light
This research creates organic–inorganic hybrid thin films with a helical structure and uses them to detect circularly polarized light.
*Illustrative imageGenerating near-infrared light from ultraviolet light
This research uses quantum cutting, a phenomenon in which the absorption of one photon results in the emission of two, to achieve bright near-infrared emission.
*Illustrative imageInterfaces that detect faint light
By precisely controlling the interface between organic molecules and inorganic nanocrystals, this research aims at highly sensitive photocurrent amplification that can detect even weak light.
MembersFaculty
The members of the Ishii Lab are faculty, postdoctoral researchers, research assistants, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorAyumi Ishii
- Assistant ProfessorMasashi Sugiyama
- Senior Researcher (Lecturer)Shingo Hattori
- Senior Researcher (Lecturer)Yusuke Kinoshita
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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: “John Piper glass panel, Stained Glass Museum, Ely” Ojwelch / CC0 (cropped)
- Converting near-infrared light into visible light: “Agate luminescence in ultraviolet rays” Dr Anatoly / CC BY 4.0 (cropped)
- Thin films that detect circularly polarized light: “Passiflora Tendrils 03” Filo gèn' / CC BY-SA 4.0 (cropped)
- Generating near-infrared light from ultraviolet light: “LightningBranches” Caldwbr / CC0 (cropped)
- Interfaces that detect faint light: “Philippine tarsier (Carlito syrichta fraterculus) Bohol” Charles J. Sharp / CC BY-SA 4.0 (cropped)
- Related lab (井村研究室): “Front of 4th century CE Roman Lycurgus Cup, British Museum (1958,1202.1)” Chappsnet / CC BY 4.0 (cropped)
- Related lab (鹿又研究室): “Ring van Möbius - Hans Kalkhoven” Alex P. Kok / CC BY-SA 4.0 (cropped)
- Related lab (山本研究室): “Fluorescence of Riboflavin in Water” Ksenia Kandurova, Yurii Kandurov, Dmitry Stavtsev / CC BY 4.0 (cropped)
- Related lab (中田研究室): “Ship in a bottle - geograph.org.uk - 2273412” Steve Fareham / CC BY-SA 2.0 (cropped)
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