Our research on a Novel White Light Excited Two-Dimensional Fluorescence Excitation Spectroscopy Method has been Published in The Journal of Physical Chemistry Letters.

Our research led by Assistant Prof. Tatsuya Yoshida on a Novel White Light Excited Two-Dimensional Fluorescence Excitation Spectroscopy Method has been Published in The Journal of Physical Chemistry Letters.

Two-dimensional electronic spectroscopy (2DES) is a powerful technique for tracking excited-state dynamics. However, in conventional implementations based on transient-absorption detection, spectral assignments can be challenging as ground-state absorption and excited-state absorption often overlap. To address this limitation, this work introduces a new two-dimensional fluorescence excitation spectroscopy (2DFLEX) method that combines white-light excitation with Kerr-gate detection.

In this approach, highly stable, broadband white light generated from a high-repetition-rate Yb-amplified laser is used as the excitation source, enabling simultaneous coverage of a wide excitation-energy range.  Another key feature is the use of fluorescence detection, which provides selective sensitivity to stimulated-emission processes and allows isolation of information originating exclusively from excited states. Using 2DFLEX, the study successfully achieved two-dimensional excitation–emission matrices with picosecond time resolution.

Our 2DFLEX methodology substantially extends the capabilities of fluorescence-detected 2DES. As a new platform technology for spectroscopy, it is expected to facilitate deeper understanding of complex excited-state dynamics and to find broad applications across diverse molecular and materials systems.

“White Light Excited Two-dimensional Fluorescence Excitation Spectroscopy: Picosecond Time-resolved Excitation Emission Matrix”
Tatsuya Yoshida, Kiyoshi Miyata, and Ken Onda*
J. Phys. Chem. Lett. 2026, 17, 6, 1588–1595