A5100399029- Photochemistry and Electron Transfer Studies
- Spectroscopy and Quantum Chemical Studies
- Conducting polymers and applications
- Catalytic Processes in Materials Science
- Catalysis and Hydrodesulfurization Studies
- Organic Electronics and Photovoltaics
- Polyoxometalates: Synthesis and Applications
- Radical Photochemical Reactions
- Catalysts for Methane Reforming
- Advanced Sensor and Energy Harvesting Materials
- Catalysis and Oxidation Reactions
- Porphyrin and Phthalocyanine Chemistry
- Semiconductor materials and devices
- Perovskite Materials and Applications
- Thin-Film Transistor Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Chemical Physics Studies
- Zeolite Catalysis and Synthesis
- Free Radicals and Antioxidants
- Luminescence and Fluorescent Materials
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced Photocatalysis Techniques
- Electron Spin Resonance Studies
- Molecular Junctions and Nanostructures
- Mesoporous Materials and Catalysis
Korea Atomic Energy Research Institute
2023
Samsung (South Korea)
2010-2022
Institute for Basic Science
2016-2019
Ulsan National Institute of Science and Technology
2017-2019
Korea University of Science and Technology
2019
Sungkyunkwan University
2015-2018
Seoul National University
2008-2017
Government of the Republic of Korea
2016
Ulsan College
2016
National Institute of Environmental Research
2015
White-light-emitting single molecules are promising materials for use in a new generation of displays and light sources because they offer the possibility simple fabrication with perfect color reproducibility stability. To realize white-light emission at molecular scale, thereby eliminating detrimental concentration- or environment-dependent energy transfer problem conventional fluorescent phosphorescent systems, between larger band-gap donor smaller acceptor must be fundamentally blocked....
We present a microfluidic technique for measuring the deformability of single cells using pressure required to deform such through micrometre-scale tapered constrictions. Our is equivalent whole-cell micropipette aspiration, but involves considerably simpler operation, less specialized equipment, and technical skill. Single are infused into channel, then deformed series funnel-shaped The constriction openings sized create temporary seal with each cell as it passes constriction, replicating...
Using a novel polymer (polythienothiophene-co-benzodithiophenes 7 F-20) as donor and phenyl-C71-butyric acid methyl ester an acceptor of bulk heterojunction, inverted organic photovoltaics (OPVs) were fabricated. Wet-chemically prepared ZnO poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) used buffer layers. Particularly, for PEDOT:PSS deposition, no annealing step was employed. This OPV showed power conversion efficiency (PCE) ∼7.0%, which is comparable to the hitherto...
Solvent-inventory experiments on the excited-state proton transfer of a 7-hydroxyquinoline molecule complexed cyclically with two alcohol molecules in host medium n-alkane have been carried out various combinations alcohols having different proton-donating abilities. Alcohol participating hydrogen-bonded chain cyclic complex accelerate concerted fashion by accumulating their The rate-determining deprotonation directly to imino group is stimulated push-ahead effect next chain. Our results...
In this work, a simple but effective molecular design strategy is developed for the generation of intense blue emission in solid state including single crystals through multiple secondary intermolecular interactions such as CF…HC hydrogen bonding. The synthesized novel imidazole‐based excited‐state intramolecular proton transfer (ESIPT) molecule, 2‐(1‐(3,5‐bis(trifluoromethyl)phenyl)‐4,5‐diphenyl‐1H‐imidazol‐2‐yl)phenol (HPI‐CF 3 ), shows significantly enhanced fluorescence crystal (Φ F =...
ZnxCd1−xS (0 ≤ x 1) alloy nanoparticles have been fabricated facilely using ethylenediamine as a solvent-coordinating molecular template in water. (x = 0.5) of single-crystalline wurtzite structures having no staking faults constructed homogeneously to show that they are intermediate between ZnS and CdS d-spacing 2θ values. The photoluminescence shifts largely the blue with composition increase Zn shortest wavelength at 0.9 (λmax 480 nm for CdS, 396 Zn0.9Cd0.1S, 424 ZnS). thermal treatment...
Aluminum-doped zinc oxide (AZO) films (70 nm thick) with dissimilar surface roughness were created on indium tin coated glass and used as electrodes for inverted organic solar cells. The photovoltaic performance of the devices depended strongly AZO films. Increases in root-mean-square from 2.5 to 10.9 enhanced power conversion efficiency 0.5% 1.4% due increased contact area between electrode active layer.
Recent approaches in self-healable electrodes use polymers with exhibiting significantly low electrical conductivity, compared to conventional metals. Such also require external stimuli initiate self-healing, or present slow restoration for their intrinsic healing. Herein, we introduce an instantaneous and repeatable self-healing of highly conductive, fully metallic at ambient conditions. These consist silver liquid metal (with no polymer), exhibit a sufficiently high conductivity 2 S/μm....
The sequential, Grotthuss-type, proton-transport mechanism of water has been experimentally observed in the excited-state tautomerization a 7-hydroxyquinoline molecule complexed cyclically with two molecules diethyl ether.
This study examined the effects of electrode geometry combined with cell area on device performance. We systematically investigated in organic solar cells (OSCs) by introducing metal subelectrodes to reduce resistive loss indium tin oxide. The subelectrode defines active and works as conducting at same time very low resistance. series resistance could be reduced significantly using subelectrode, yielding a power conversion efficiency 2.6±0.3% up 4.08 cm2. suggests that OSCs can used for...
Ultrafast excited-state proton transfer of 8-hydroxuquinoline to produce short-lived its tautomeric form causes immensely attenuated fluorescence in water.
The series resistance of organic photovoltaic (OPV) devices was decreased by reducing the sheet indium tin oxide (ITO) electrode, which leads to increasing device efficiency. performance bulk heterojunction OPVs critically dependent on ITO electrode. Upon from , fill factor and power conversion efficiency OPV improved (from 0.407 0.580 respectively) under an AM1.5 simulated solar intensity . dependence suggests dominance electrode as a limiting in practical cell efficiencies.