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Vacha Lab
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A lab that observes molecules one at a time to investigate the optical properties of organic materials at the nanoscale.
AboutAbout the lab
Seeing and understanding the nanoscale world of organic materials.
Vacha Lab studies the nanoscale world of organic and polymeric materials through single-molecule observation and spectroscopy.
By observing the light emitted by individual molecules, the lab can see heterogeneity within a material and learn about its structure, dynamics, and photochemistry.
Single-molecule spectroscopy is also the foundation of the super-resolution microscopy techniques recognized with the Nobel Prize in Chemistry.
With applications in optoelectronic devices and energy conversion devices in mind, the lab investigates the fundamental properties of materials.
Key terms
- Single-molecule spectroscopy
- A method that measures the light emitted by one molecule, rather than by many molecules together
- Quantum dot
- A semiconductor particle a few nanometers in size. The color of the light it emits changes with the size of the particle
- Exciton
- A state in a material that has absorbed light, in which an electron and a hole are bound together and move around as a pair
NewsLab news
A doctoral student won a Poster Award at an international photochemistry conference
A student won the Young Researcher Encouragement Award at the Fullerene-Nanotubes-Graphene General Symposium
A student won the Excellent Student Presentation Award for a poster presentation at the 2024 Symposium on Photochemistry
A master's student won the Best Presentation Award at the master's thesis presentation
ResearchResearch themes
Single-molecule spectroscopy is a powerful method for investigating soft, complex materials at the nanoscale. Vacha Lab uses the emission from individual molecules to reveal the structure, dynamics, and photochemistry of organic materials, aiming to apply this knowledge to optoelectronic and energy conversion devices.
*Illustrative imageThe shape and light of organic semiconductors
Conjugated polymers are organic semiconductors expected to find use in displays, lighting, and solar cells. The lab focuses on a single polymer chain and studies how the way it bends relates to its emission spectrum, exciton migration, and photooxidation.
*Illustrative imageMeasuring organic EL at the nanoscale
Organic electroluminescence (EL) is a technology used in applications such as TV displays. The lab measures EL from single organometallic complex molecules, single conjugated polymer chains, and single halide perovskite nanocrystals.
*Illustrative imageQuantum dots and perovskites
Semiconductor quantum dots and halide perovskite nanocrystals are candidates for new light-emitting materials. The lab studies the emission spectrum of each individual particle, size distribution, photoluminescence quantum yield, blinking, and the influence of the surrounding environment.
*Illustrative imageChanging the color of light
The lab observes how triplet excitons spread in molecular solids, and the process in which two triplets collide and annihilate each other. This is linked to photon upconversion, which converts low-energy photons into higher-energy photons.
MembersFaculty
Vacha Lab's members include faculty, researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorMartin VachaPublications ↗
- Assistant Professor川本 正
- Assistant ProfessorShun OmagariPublications ↗
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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: “EFluor Nanocrystal Vials” Travis.jennings / CC BY 3.0 (cropped)
- The shape and light of organic semiconductors: “Luminescent polythiophenes” Aromaticmoleculessmell / CC BY 3.0 (cropped)
- Measuring organic EL at the nanoscale: “Nexus one screen microscope” Matthew Rollings / CC BY 3.0 (cropped)
- Quantum dots and perovskites: “Perovskite domain structure” Furasova / CC BY 4.0 (cropped)
- Changing the color of light: “Upconversion Fluorescence - Optical fiber that contains infrared light shines with a blue color in the dark - Laser Physics Lab - NTNU-NT” NTNU, Faculty of Natural Sciences and Technology / CC BY 2.0 (cropped)
- Related lab (金子研究室): “Scanning tunneling microscope-MHS 2237-IMG 3817-gradient” Rama / CC BY-SA 3.0 fr (cropped)
- Related lab (笹川研究室): “Superconductor-levitation” Pongkaew / CC0 (cropped)
- Related lab (熊井・村石研究室): “Aluminium metal pieces” W. Oelen / CC BY-SA 3.0 (cropped)
- Related lab (道信研究室): “1inchpolymersolarcell” Aromaticmoleculessmell / CC BY 3.0 (cropped)
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