A5100618959- Advanced Fiber Laser Technologies
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Silicon Nanostructures and Photoluminescence
- Advanced Photocatalysis Techniques
- Perovskite Materials and Applications
- Photonic and Optical Devices
- Diamond and Carbon-based Materials Research
- MXene and MAX Phase Materials
- Graphene research and applications
- Photonic Crystals and Applications
- Nanowire Synthesis and Applications
- Advanced Thermoelectric Materials and Devices
- Laser-Matter Interactions and Applications
- 3D IC and TSV technologies
- Nanopore and Nanochannel Transport Studies
- Biosensors and Analytical Detection
- Photonic Crystal and Fiber Optics
- Electronic Packaging and Soldering Technologies
- Nanoplatforms for cancer theranostics
- Advanced X-ray Imaging Techniques
- Mechanical and Optical Resonators
- Advanced biosensing and bioanalysis techniques
- Carbon and Quantum Dots Applications
Korea Institute of Industrial Technology
2024
Gwangju Institute of Science and Technology
2022
Pohang University of Science and Technology
2018-2021
Korea Institute of Science and Technology
2013-2021
Institute for Basic Science
2018-2019
University of California, San Francisco
2019
LG (South Korea)
2019
Ajou University
2011
Chosun University
2008
Highly luminescent CuInS2/ZnS (CIS/ZnS) core/shell quantum dots with a yield of 65% were synthesized by cation exchange reaction. Similar sized CIS cores and CIS/ZnS core/shells, which confirmed TEM, showed that occurred inside the core, reduced core size increased blue-shift in their emission. ICP revealed to have gradient composition is richer indium close surface explains broad emission spectrum. This reaction could be applied AgInS2 (AIS) QDs, blue shift 70 nm The PXRD pattern also peak...
An in-depth experimental investigation was conducted into the use of a graphene oxide-based saturable absorber implemented on side-polished fiber platform for femtosecond pulse generation in 2 μm region. First, it experimentally shown that an all-fiberized thulium-holmium (Tm-Ho)-codoped ring laser with reduced cavity length can produce stable pulses by incorporating oxide-deposited fiber. Second, measurement accuracy issue obtaining precise pulse-width value autocorrelator together silica...
The high activity of specific enzymes in cancer has been utilized diagnosis, as well tumor-targeted drug delivery. NAD(P)H:quinone oxidoreductase-1 (NQO1), an overexpressed enzyme certain tumor types, maintains homeostasis and inhibits oxidative stress caused by elevated reactive oxygen species (ROS) cells. NQO1 lung liver cells is increased compared to that normal Interestingly, reacts with trimethyl-locked quinone propionic acid (QPA) produces a lactone-based group via intramolecular...
Abstract In this paper, we report on our progress developing heavy metal free (or Cd‐free) QD‐LEDs for all three colors. With improvement in synthesis, have developed high quantum yield dots (more than 95% red and green more 80% blue), with peak wavelengths suitable BT.2020. Building upon these high‐performance through novel device structure design optimization demonstrated efficiency EQE = 16.9%, 13%, 9% red, green, blue, respectively. Specifically, a systematic study the impact of shell...
Abstract MoS 2 composed of earth‐abundant elements is considered as a promising hydrogen evolution reaction (HER) catalyst for p‐type Si photocathode owing to its appropriate adsorption free energy the edge sites and high photochemical stability in acidic electrolytes. However, direct synthesis uniform atomically thin on by usual chemical vapor deposition techniques remains challenging because weak van der Waals interaction between . Herein, controlling gas phase kinetics during...
Environmentally friendly ZnSe/ZnS core/shell quantum dots (QDs) as an alternative blue emission material to Cd-based QDs have shown great potential for use in next-generation displays. However, it remains still challenging realize a high-efficiency dot light-emitting diode (QLED) based on due their insufficient electrical characteristics, such excessively high electron mobility (compared the hole mobility) and deep-lying valence band. In this work, effects of doped with transport materials...
We report wafer-scale growth of atomically thin, three-dimensional (3D) van der Waals (vdW) semiconductor membranes. By controlling the kinetics in near-equilibrium limit during metal-organic chemical vapor depositions MoS2 and WS2 monolayer (ML) crystals, we have achieved conformal ML coverage on diverse 3D texture substrates, such as periodic arrays nanoscale needles trenches quartz SiO2/Si substrates. The properties, channel resistivity photoluminescence, are verified to be seamlessly...
Hybrid photovoltaic (PV) cells containing CuInS 2 quantum dots (CIS QDs) incorporated into organic PV layers were developed through a simple solution process. Four types of such fabricated by blending poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl C 61 butyric acid methyl ester (P3HT:PCBM) and CIS QDs in weight ratios 1:1:0, 1:1:0.2, 1:1:0.5, 1:1:1. The hybrid cell with exhibited increased light absorption greater efficiency than the purely cell. In performance tests under an air mass (AM) 1.5...
Hexagonal boron nitride (hBN) is a wide bandgap van der Waals material that emerging as powerful platform for quantum optics and nanophotonics. In this work, we demonstrate whispering gallery mode silica microresonators hybridized with thin layers of hBN exhibit high intrinsic optical quality factor >7 × 105 linear absorption coefficient 9.5 cm–1. Measurements the effect thickness on Q comparison theoretical model allows films to be estimated. These high-Q devices will useful applications in...
Highly uniform silicon nanopore membranes were developed for applications in implantable bioartificial organs. A robust, readily scalable, non-fouling surface coating is required to enhance membrane hemocompatibility. However, the must be ultrathin keep nanopores from occluding. Recently, zwitterionic brush polymers have demonstrated significantly lower fouling under biological conditions. In this study, we explore poly(sulfobetaine methacrylate) (pSBMA) at sub-5 nm thickness. Membrane...
Multi-encoded rugate porous silicon (PSi)-based optical biosensor was developed to specify the biomolecules. PSi generated by an electrochemical etching of wafer using electrode configuration in aqueous ethanolic HF solution. displayed three very sharp reflection bands whose maxima varied spatially across PSi. The sensor system studied consisted a multilayer modified with biotin. probed various fragments protein analyte. operates measurement peaks white light spectrum from layer. When...
Biotin/silole-derivatized distributed Bragg reflectors porous silicon (DBR PSi) smart particles for the detection of streptavidin have been developed. DBR PSi fabricated by applying a computer-controlled periodic square current waveform was prepared application as label-free biosensor based on interferometer. The fabrication, optical characterization, and surface derivatization were described. displaying dual properties such photoluminescence (lambda(em) = 505 nm) reflectivity (lambda(max)...
Although various methods have been developed to disperse transition metal dichalcogenides (TMDCs) in aqueous environments, the methodology generate stable TMDC dispersions remains challenging. Here, we a hierarchical van der Waals (vdW) heterostructure-based strategy few-layered TMDCs (WS2, MoS2, WSe2, and MoSe2) using both hexagonal boron nitride (hBN) sodium cholate (SC) as synergistic vdW surfactants. By showing long-term stability of up 3 years, extinction spectra these TMDC/hBN/SC...
In this paper we report on our progress developing heavy metal free (or Cd‐free) QD‐LEDs for all three colors. With improvement in synthesis have developed high quantum yield QDs (>95% Red and Green; >80% Blue) with peak wavelengths suitable BT.2020. Building upon these performance through novel device structure design optimization demonstrated efficiency EQE=16.9%, 13%, 9% Red, Green, Blue, respectively.
In article number 1700142, Moon-Ho Jo, Ho Won Jang and co-workers directly synthesize a 3D molybdenum disulfide (MoS2), which acts as catalyst for hydrogen evolution reaction, on the TiO2-coated p-type Si photocathode solar water splitting. The fabricated photocathodes exhibit excellent performances in photoelectrochemical reaction due to advantages of MoS2, reduces overpotential by abundant edge sites exposed ambient increases absorption sun light antireflection effect. This strategy paves...
Hexagonal boron nitride (hBN) is a wide bandgap van der Waals material that emerging as powerful platform for quantum optics and nanophotonics. In this work, we demonstrate whispering gallery mode silica microresonators hybridized with thin layers of epitaxially grown hBN exhibit high optical quality factor $> 7 \times 10^5$. Measurements the effect thickness on $Q$ comparison theoretical model allows linear absorption coefficient films to be estimated. These high-$Q$ devices will useful...