1D and 2D Photophysics

We investigate unique physical properties of low-dimensional materials such as carbon nanotubes and two-dimensional semiconductors. Our research focuses on understanding exciton-phonon interactions, exciton dynamics, and interlayer coupling effects. We explore novel optical phenomena including upconversion luminescence and laser cooling through selective excitation of bright excitons in carbon nanotubes. We also study efficient energy transfer in two-dimensional heterostructures and photocarrier relaxation processes. Our goal is to translate these fundamental insights into applications for next-generation optical devices and quantum technologies.

Upconversion photoluminescence in carbon nanotubes featured image

Upconversion photoluminescence in carbon nanotubes

PL and UCPL spectra for the same SWNT. Introduction Our research delves into an exciting optical phenomenon called upconversion photoluminescence, where materials absorb …

avatar
Daichi Kozawa
Efficient energy transfer in ultra-thin materials featured image

Efficient energy transfer in ultra-thin materials

Efficient Energy Transfer in Ultra-Thin Materials. © 2016 American Chemical Society Our research group is exploring the Fast Interlayer Energy Transfer in MoSe2/WS2 …

avatar
Daichi Kozawa
Photocarrier relaxation pathway in two-dimensional semiconductors featured image

Photocarrier relaxation pathway in two-dimensional semiconductors

Lattice structures monolayer and bilayer. ©2014 Springer Nature Limited Our research group has revealed the Photocarrier Relaxation Pathway in Two-Dimensional Semiconducting …

avatar
Daichi Kozawa