A5013971136- Spectroscopy and Quantum Chemical Studies
- Advanced Fluorescence Microscopy Techniques
- Photochemistry and Electron Transfer Studies
- Molecular Junctions and Nanostructures
- Molecular Spectroscopy and Structure
- DNA and Nucleic Acid Chemistry
- Advanced Chemical Physics Studies
- Machine Learning in Materials Science
- Porphyrin and Phthalocyanine Chemistry
- Advanced biosensing and bioanalysis techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Magnetism in coordination complexes
- solar cell performance optimization
- Spectroscopy and Chemometric Analyses
- Organic Light-Emitting Diodes Research
- Metabolomics and Mass Spectrometry Studies
- Biosensors and Analytical Detection
- Nanowire Synthesis and Applications
- Nanocluster Synthesis and Applications
- Thin-Film Transistor Technologies
- Bacterial biofilms and quorum sensing
- Chalcogenide Semiconductor Thin Films
- Computational Drug Discovery Methods
- Organic Electronics and Photovoltaics
- Protein Structure and Dynamics
Pohang University of Science and Technology
2014-2025
RIKEN
2020-2022
Nanyang Technological University
2020
Excited state intramolecular proton transfer (ESIPT) of 1-hydroxy-2-acetonaphthone (HAN) has been in controversy, mainly because its Stokes shift is small compared to those typical ESIPT molecules. We have investigated excited dynamics HAN by time-resolved fluorescence with a resolution high enough record the nuclear wave packet motions state. Population both normal and tautomer forms were recorded together state, which confirm HAN. The population imply that biphasic two time constants <25...
The effects of epitaxial materials and solar cell design on the performance cells grown by multilayer approach are investigated. novel structure with a p-on-n type configuration suggested exhibits improved uniformity in photovoltaic because suppression Zn diffusion. This provides routes to achieve further improvements acts as guideline for commercialization technique.
Hidden Markov models (HMMs) are used to learn single-molecule kinetics across a range of experimental techniques. By their construction, HMMs assume that events occur on slower timescales than those data acquisition. To move beyond HMM limitation and allow for any timescale, we must treat in continuous time as they nature. We propose method kinetic rates from Förster resonance energy transfer (smFRET) collected by integrative detectors, even if exceed acquisition rates. achieve that, exploit...
Nuclear wave packets (NWPs) in electronically excited states generated by ultrashort laser pulses can persist through photochemical processes and be detected the product state. The NWPs that are coupled with reaction dynamics undergo changes during process provide crucial insights into potential energy surfaces molecular dynamics. We present a computational method to calculate products of ultrafast projecting nuclear displacements, obtained via Born–Oppenheimer simulations, onto normal modes...
The effect of varying degrees surface and vertical coverage gold nanoparticles (Au-NPs) by poly(styrenesulfonate)-doped poly(3,4-ethylenedioxythiophene) (PEDOT:PSS), which was used as a capping layer between indium tin oxide (ITO) hole transport (HTL) on small-molecule fluorescent organic light-emitting diodes (OLEDs), systemically investigated. With respect to the Au-NP loading amount size, resultant current densities influenced charge balance and, therefore, OLED device performance. When...
The acidic proton in pyranine is transferred coherently to acetate through the stretching motion of whole molecule.
Lifetimes of chemical species are typically estimated by either fitting time-correlated single-photon counting (TCSPC) histograms or phasor analysis from time-resolved photon arrivals. While both methods yield lifetimes in a computationally efficient manner, their performance is limited choices made on the number distinct contributing photons. However, encoded arrival times collected for each illuminated spot and need not be set hand
Single-molecule Förster resonance energy transfer (smFRET) is widely utilized to investigate the structural heterogeneity and dynamics of biomolecules. However, it has been difficult simultaneously achieve a wide observation time window, high structure resolution, resolution with current smFRET methods. Herein, we introduce new method utilizing two-dimensional fluorescence lifetime correlation spectroscopy (2D FLCS) surface immobilization techniques. This method, scanning 2D FLCS, enables us...
Detection of the biofilm bacteria would be a counter strategy to detect hidden in their camouflage. Through unbiased screening biofilm, we discovered long wavelength probe CDr15 with extracellular DNA as molecular target. revealed real-time geometric distribution eDNA 3D bacterial colony.
A <sup>Py</sup><bold>A</bold>-modified adenine cluster, exhibiting a large Stokes shift based on interstrand stacking interactions of adenines, was investigated and exploited as signaling parts fluorescent DNA probes.
A trimer of dicyanoaurate has been studied as a model system the covalent chemical bond formation. Here, we report dynamics in water upon photoexcitation by femtosecond time-resolved luminescence (TL) and spectra at cyrogenic temperature. Temperature was varied means to control medium flexibility well population isomers. unique parallelism between spectrum vs. time temperature observed, which enables unambiguous band assignments facilitates investigation dynamics. Upon S1, intersystem...
Revealing a proper reaction coordinate in chemical is the key step towards elucidation of molecular dynamics. In this report, we investigated dynamics intramolecular charge transfer (ICT) 8-aminopyrene-1,3,6-trisulfonic acid (APTS) occurring excited state by time-resolved fluorescence (TF) and TF spectra. Accurate rates rate-dependent nuclear wave packets product allow detailed investigation The ICT rate solvent dependent: (34 fs)-1 , (87 (∞)-1 water, formamide, dimethylformamide,...
The Cover Feature illustrates the trajectory of wave packets on excited state following photoexcitation and coherent intramolecular charge transfer reaction. Amplitude packet ring deformation mode is modified by reaction rate, whereas breathing orthogonal to coordinate therefore impervious rate. More information can be found in Article W. Heo T. Joo page 1448 Issue 11, 2019 (DOI: 10.1002/cphc.201801103).
Abstract Lifetimes of chemical species are typically estimated, across each illuminated spot a sample, by either fitting time correlated single photon counting (TCSPC) decay histograms or, more recently, through phasor analysis from time-resolved arrivals. While both methods yield lifetimes in computationally efficient manner, the performance is limited choices made when TCSPC histogram. In addition, also requires setting number hand before can be determined. Yet itself encoded arrival times...
Abstract Our goal is to learn kinetic rates from single molecule FRET (smFRET) data even if these exceed the acquisition rate. To achieve this, we develop a variant of our recently proposed hidden Markov jump process (HMJP) with which transition kinetics parallel measurements in donor and acceptor channels. HMJP generalizes model (HMM) paradigm two critical ways: (1) it deals physical smFRET systems as they switch between conformational states continuous time ; (2) estimates directly without...
Recent advances in short pulse lasers and time domain spectroscopies enabled investigation of molecular dynamics a few femtosecond even attosecond regime.For coherent photochemical reaction occurring an electronic excited state, can be studied by recording the nuclear wave packet motions reactant product potential energy surfaces (PES) following photoexcitation to Franck-Condon state.[1][2][3][4] Wave packets state may also formed impulsive chemical reaction.Evolution contain extensive...