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Hetero-Fusion Materials Lab
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A lab that creates light-emitting materials using luminescent radicals and dendrimers.
AboutAbout the lab
Creating light-emitting materials from molecular design.
The Hetero-Fusion Materials Lab studies the creation and functional development of light-emitting materials and organic semiconductor materials at the boundary of organic chemistry, materials chemistry, and photochemistry.
As light-emitting molecules, the lab focuses on luminescent radicals, whose ground state and excited state are both doublets, and on dendrimers.
The lab works consistently from molecular design and synthesis through evaluation of optical properties to device applications.
On the lab's website, it is introduced under the name "Yamashita Lab."
Key terms
- Dendrimer
- A polymer in which branched monomers are connected in a tree-like form. It has a single molecular weight and a well-defined structure
- Luminescent radical
- A radical whose ground state is a doublet, and a material that emits only from the doublet excited state as well
- Rectification
- The property by which electrical conductance changes depending on the direction in which voltage is applied
NewsLab news
A paper on a water-soluble luminescent radical as a dual imaging probe for fluorescence and nuclear magnetic resonance was published in Advanced Science
In joint research with the Institute of Science Tokyo, a paper on blue upconversion OLEDs was published in Advanced Functional Materials
A student received a Poster Award at the 14th Asian and Oceanian Photochemistry Conference
A paper on a naphthalene-substituted luminescent radical was accepted by Chemistry Letters
Kyushu University issued a press release on the lab's results on a new luminescent radical exhibiting circularly polarized light
ResearchResearch themes
The Yamashita Lab makes light-emitting materials and organic semiconductor materials at the boundary of organic chemistry, materials chemistry, and photochemistry, and develops their functions. Working consistently from molecular design and synthesis through evaluation of optical properties to device applications, it aims to create next-generation organic functional materials that combine luminescence, spin, and polarization functions.
*Illustrative imageSolution-processed OLED materials
Solution-processed organic EL (OLED) materials are expected to allow cheaper, larger-area devices, but they have not yet reached practical use. Centering on carbazole dendrimers, the lab develops new solution-processable light-emitting materials and applies them to high-efficiency OLED devices.
*Illustrative imageQuantum materials using luminescent radicals
In light-emitting materials whose ground state is a doublet (radicals), emission comes only from the doublet excited state as well. The lab develops these luminescent radicals aiming at higher efficiency and better stability, and has also shown that making them water-soluble allows their use as imaging probes for fluorescence and nuclear magnetic resonance.
*Illustrative imageAssembly of dendrimers and sensing
Carbazole dendrimers combined with a suitable acceptor molecule change their emission color depending on the environment, such as the solvent. In joint research with the University of Tsukuba and others, the lab found that third-generation dendrimers, which are hard to crystallize, form crystals with a porous structure. These crystals change emission color when they take up solvent vapor, so they can be used as sensing materials.
*Illustrative imageSingle-molecule diodes
In joint research with Osaka University, the lab measured the conductance of a single molecule of a carbazole-linked oligomer using the mechanically controllable break junction (MCBJ) method. It has been found that the oligomer shows rectification, in which conductance changes depending on the direction of the voltage.
MembersFaculty
Members of the Yamashita Lab consist of faculty, research fellows, technical staff, PhD and master's students, and non-degree research students.As of 2026
- Associate ProfessorKen Yamashita
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: “70 Light-emitting-diode-(LED)” www.LEDlighting5.com / CC BY-SA 3.0 (cropped)
- Solution-processed OLED materials: “OLED SUBPIXELS” TECH EDU / CC BY-SA 4.0 (cropped)
- Quantum materials using luminescent radicals: “Luminescence material” Vishal Garasia vish / CC BY-SA 4.0 (cropped)
- Assembly of dendrimers and sensing: “Dendrimer and dendron” Olukin at English Wikipedia / CC BY-SA 4.0 (cropped)
- Single-molecule diodes: “Molecular Electronics ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (ナノ融合材料分野): “Such different zinc oxide - nanorods” Andrey P. Tarasov / CC BY 4.0 (cropped)
- Related lab (ナノ組織化分野): “Blue Phase Core-Shell Liquid Crystals” Aecohen64 / CC BY 4.0 (cropped)
- Related lab (ナノ構造光学分野): “Electron microscope-CNAM 43819” Antoaneta from Paris, France / CC BY 2.0 (cropped)
- Related lab (ナノ材料解析分野): “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
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