Chemical dynamics of organometallic complexes in condensed phase

Ultrafast intramolecular relaxation dynamics of a photo-excited organometallic complex can be examined by femtosecond optical spectroscopy. Our group uses coherent optical spectroscopy to identify the role of molecular vibrations on the swift intersystem crossing process. We are also interested in deciphering ultrafast intramolecular charge/energy transfer reactions of advanced organometallic materials.

Excited state reaction dynamics of molecular aggregates on surface

Charge transfer from organic/inorganic photosensitizers to semiconductors is a critical process that governs the overall reaction in dye-sensitized solar cells and artificial photosynthesis. Understanding the exact mechanism of the charge injection from the adsorbed dye to the semiconductor surface and its reaction quantum yield is crucial to assessing the efficiency of the systems. Our group reveals the ultrafast reaction dynamics of photosensitizers anchored on the surface of a thin semiconductor film by ultrafast optical spectroscopy.

Photophysics of photonic energy materials and devices

Understanding the photo-physics of advanced light-emitting and photocatalytic materials is essential for improving their quantum efficiencies. Our group employs rapid time-resolved optical spectra measurements and their chemometric analysis to unveil the photo-induced reaction processes of various photonic materials.

Development of new spectroscopic techniques and chemometric methods.

Analyzing some convoluted emission bands in the time domain is crucial to elucidate exciton dynamics and device physics in organic light-emitting diodes (OLEDs). Our group has developed a chemometric tool and cost-efficient time-resolved photoluminescence spectrometer for rapid deconvolution of excitonic bands. Now, we use them to perform an operand analysis of an OLED device.