The main research subjects we are focusing on are

  • Preparation of fluorescent nanomaterials and photo-functional molecules

  • Control of charge carrier dynamics and fluorescence blinking in nanomaterials

  • Optical control of biomolecular functioning in cells

  • Manipulation of molecules and nanomaterials using laser tweezers

In these research subjects, we employ steady-state and time-resolved fluorescence spectroscopy, single molecule fluorescence microspectroscopy, and laser trapping microspectroscopy.


Creation of novel nanomaterials for photonics

We develop luminescent semiconductor nanomaterials which have unique electronic and optical properties. These include lead halide perovskites and chalcogenide quantum dots.

We investigate the charge carrier, fluorescence and electron transfer dynamics of the above nanomaterials at the ensemble and single-molecule levels.

We develop molecular sensors of oxidative stress and biological electron transfer reactions. These sensors include organic electron donor-acceptor dyads.

We develop biomolecular assemblies and perovskite crystals by optical trapping.

Bio-Nano Interface

Exploration of the interface between biology and nanoscience not only is expected to resolve fundamental problems in laboratory life science but also has the potentials of reforming human life.

Our laboratory is interested in developing novel nanobioconjugates and molecular probes and applying the conjugates for pinpointing the functioning of biomolecules at single-molecule and single cell levels.


Optical manipulation

We are developing optical manipulation methods by means of laser-trapping to fabricate nanostructures for photonics.

Laser-trapping can achieve selective growth of crystals in nano- micro-meter scales and locally selective substitution of crystals.

We believe this methodology will open a door for future technology to control the structure of materials on demand.



Chemical routes to photo-active nanoscale materials

Groundbreaking advances in photo-voltaic and optoelectronic technologies depend mostly on a realization of novel materials having unique optical properties.

We focus a part of our effort on the design and development of novel photo-active nanomaterials in one, two, and three dimensions, with an emphasis on precisely controlling the optical activity.

Organic and inorganic molecules are our raw materials and wet thermal chemistry and photochemistry are our tools. By optimally controlling the size, shape, and composition of nanomaterials, we generate unique fluorescence, phosphorescence and photothermal properties.

Subsequently, such nanomaterials will be applied to selected problems in biosensing, bioimaging, energy harvesting, and environmental remediation.