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Ishii-Fukagawa Lab
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The lab explores how organic molecules conduct electricity and emit light, using its own original measurement methods.
AboutAbout the lab
How organic EL emits light, seen from the arrangement of electrons.
The Ishii-Fukagawa Lab studies the electronic structure that underlies organic electronics.
Using electron spectroscopy, the lab clarifies which levels electrons occupy, and how, inside the molecules used in devices such as organic EL displays.
It also examines the electrical characteristics of the devices themselves, linking both spectroscopy and device research to improved performance.
The lab develops its own measurement methods and instruments, found nowhere else in the world, and carries out its research with them.
Key terms
- Photoelectron spectroscopy
- A method that shines intense light on a material and measures the electrons that are emitted, to learn how electrons are arranged inside a molecule
- Work function
- The energy needed to remove one electron from a material. It determines how an electrode and a molecule connect electronically
- Organic EL (OLED)
- A device in which the organic molecules themselves emit light when a voltage is applied. It is used in displays and lighting
NewsLab news
A doctoral student received the Best Presentation Award at the Young Researchers' Forum on Opening the Future of Organic Molecular and Bioelectronics
A doctoral student received the Shoulders-Gray-Spindt Award at the International Vacuum Nanoelectronics Conference
A doctoral student received the Presentation Encouragement Award at the 60th Japan Society of Applied Physics meeting
A paper on an "organic EL device that can generate power" was featured in a press release from Chiba University
Project Professor Hirohiko Fukagawa received the Best Paper Award at the International Display Workshops
ResearchResearch themes
The lab uses electron spectroscopy to clarify the electronic structure that underlies organic electronics, which attracts attention for applications such as organic EL displays. It also examines the electrical characteristics of the devices themselves, and pursues research that leads to better performance through both spectroscopy and device studies.
*Illustrative imageInvestigating Electronic Structure with Photoelectron Spectroscopy
When high-energy light such as ultraviolet is shone on a material, electrons are emitted by the photoelectric effect. Measuring the velocity distribution of these photoelectrons shows how electrons were distributed inside the original molecule, and makes it possible to study things such as how electron levels line up at the interface between an organic molecular layer and an electrode.
*Illustrative imageInvestigating Electronic Structure with Photoelectron Yield Spectroscopy
Photoelectron spectroscopy can only be measured in high vacuum, and it is poorly suited to highly insulating samples. Photoelectron yield spectroscopy measures only the total amount of emitted electrons, so it can be used in air and on insulators, and can also examine the ionization energy of liquids and of organic transistors during operation.
*Illustrative imageMeasuring Surface Potential with the Kelvin Probe Method
A sample and a reference electrode are placed facing each other, and the distance between the plates is made to oscillate. The difference in work function is measured from the alternating signal that flows as a result. The lab uses this to measure the large surface potential caused by spontaneous polarization in organic EL devices, and to measure work functions in liquids.
*Illustrative imageInvestigating Devices with the Displacement Current Method
The lab has been developing a displacement current measurement method to probe carrier behavior inside devices. Because it reveals carrier injection characteristics, spatial distribution, trap characteristics, and polarization characteristics, the lab uses it to study the operating mechanism of organic transistors and the relationship to degradation in organic EL devices.
MembersFaculty
The Ishii-Fukagawa Lab consists of faculty and doctoral, master's, and undergraduate students. Faculty from the Advanced Science Center also take part in supervision.As of 2026
- ProfessorHisao Ishii
- Project ProfessorHirohiko Fukagawa
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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: “AMOLED display microphoto 002 front ( )” Jan Helebrant / CC BY-SA 2.0 (cropped)
- Investigating Electronic Structure with Photoelectron Spectroscopy: “Iodide photoelectron image” JJJNewman / CC BY-SA 4.0 (cropped)
- Investigating Electronic Structure with Photoelectron Yield Spectroscopy: “Silver Target in XPS Spectrometer” MichaelBueker / CC BY-SA 3.0 (cropped)
- Measuring Surface Potential with the Kelvin Probe Method: “Scanning Kelvin Probe (SKP) Block Diagram” Sraisac / CC BY-SA 4.0 (cropped)
- Investigating Devices with the Displacement Current Method: “Metal Oxide TFT Cross Section” NoAppliedVoltage / CC BY-SA 4.0 (cropped)
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