Korea University · Engineering
Professor Chul Hoon Kim's research lab specializes in ultrafast photophysics and photochemistry, focusing on intramolecular energy and charge transfer dynamics in organic and hybrid materials. The lab investigates excited-state processes such as excited-state intramolecular proton transfer (ESIPT) and intramolecular charge transfer (ICT) using advanced femtosecond time-resolved fluorescence techniques. Key research directions include the design and characterization of functional dyes, metal-organic frameworks (MOFs), and hybrid photocatalysts for solar energy conversion and CO₂ reduction. The lab also develops high-resolution spectroscopic tools to probe ultrafast dynamics with sub-100 fs time resolution.
Figures are computed from collected data and may differ slightly.
Excited state intramolecular proton transfer (ESIPT) and subsequent intramolecular charge transfer (ICT) dynamics of a 2-(2'-hydroxyphenyl)benzoxazole derivative conjugated with an electron withdrawing group (HBOCE) in solutions and a polymer film has been investigated by femtosecond time-resolved fluorescence (TRF) and TRF spectra measurements without the conventional spectral reconstruction method. TRF with high enough resolution (<100 fs) reveals that the ESIPT dynamics of HBOCE in liquids pr
A porphyrinic metal-organic framework (<b>PMOF</b>) known as PCN-222(Zn) was chemically doped with a molecular Re(I) catalyst-bearing carboxylate anchoring group to form a new type of metal-organic framework (MOF)-Re(I) hybrid photocatalyst. The porphyrinic MOF-sensitized hybrid (<b>PMOF/Re</b>) was prepared with an archetypical CO<sub>2</sub> reduction catalyst, (L)Re<sup>I</sup>(CO)<sub>3</sub>Cl (Re(I); L = 4,4'-dicarboxylic-2,2'-bipyridine), in the presence of 3 vol % water produced CO with
Three new D-π-A-structured organic dyes, coded as <b>SGT-138</b>, <b>SGT-150</b>, and <b>SGT-151</b>, with the expansion of π-conjugation in the π-bridge and acceptor parts have been developed to adjust HOMO/LUMO levels and to expand the light absorption range of organic dyes. Referring to the <b>SGT-137</b> dye, the π-bridge group was extended from the 4-hexyl-4<i>H</i>-thieno[3,2-<i>b</i>]indole (<b>TI</b>) to the 9-hexyl-9<i>H</i>-thieno[2',3':4,5]thieno[3,2-<i>b</i>]indole (<b>TII</b>), and
We report a time-resolved fluorescence apparatus utilizing fluorescence upconversion by noncollinear sum frequency generation and two photon absorption as an excitation. Near perfect time-resolution is achieved with 20 fs pulses to give the instrument response of 33 fs (FWHM) over the entire fluorescence wavelength for a 100 microm thick mixing crystal. Through experiments and numerical simulations, it is shown that 40 fs time-resolution can be obtained even for a 580 microm thick mixing crystal
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