Research Topics

• Electroabsorption


• Electrophotoluminescence


• Time-resolved emission

       decay measurements

• Time-resolved emission

       spectrum measurements


• Time-resolved photocurrent


• Impedance spectra



• Fluorescence lifetime

       Imaging measurements

• Time-resolved emission

       imaging measurements



Control of dynamics of molecules and molecular systems is extremely important to create novel functions in materials and biological systems. The use of light along with application of electric field as a tool to give external stimuli has many advantages which originate from the characteristics of interaction among photon, molecules and electric field.

Our primary research interests include the following three major parts:

(a) Structure and Dynamics in the Photoexcited States:

Electronic properties and dynamics in the photoexcited states of optoelectronic materials will be examined, based on the measurements of electroabsorption (E-A) and electro-photoluminescence (E-PL) spectra and time-resolved photoluminescence (PL) and E-PL decays and spectra.

(b) Novel Materials Function:

Electrical conductivity of organic conductors and ionic solids will be examined with photoirradiation and/or application of electric, as a part of our strategy  toward the realization of photoinduced superconductivity or photoinduced superionic conductivity.


(c) Dynamics and Function of Biological System:

Intracellular environments and function can be examined using fluorescence lifetime microscopy (FLIM). Intracellular dynamics and function in the presence of  short pulsed electric field will be also examined with FLIM. We have specially focused to the difference between cancerous cells and non-malignant cells regarding short pulsed electric field effects on intracellular function.