A5022480064- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Luminescence and Fluorescent Materials
- Thin-Film Transistor Technologies
- Advanced Sensor and Energy Harvesting Materials
- Physics of Superconductivity and Magnetism
- Nanomaterials and Printing Technologies
- Educational Research and Pedagogy
- Synthesis and properties of polymers
- Green IT and Sustainability
- Semiconductor materials and devices
- Semiconductor Lasers and Optical Devices
- Education, Safety, and Science Studies
- Silicone and Siloxane Chemistry
- Educational Systems and Policies
- Liquid Crystal Research Advancements
- Molecular Junctions and Nanostructures
- Education and Learning Interventions
- Carbon Nanotubes in Composites
- Polydiacetylene-based materials and applications
- Nanofabrication and Lithography Techniques
- Iron-based superconductors research
- Graphene research and applications
- Quantum, superfluid, helium dynamics
Hanbat National University
2018-2025
Gyeongsangnam-do Agricultural Research and Extension Services
2023
Electronics and Telecommunications Research Institute
2010-2022
Chungbuk National University Hospital
2022
Korea Research Institute of Standards and Science
2022
Korea University of Science and Technology
2022
Seoul National University Bundang Hospital
2022
Seoul National University
2022
Woo Young Medical (South Korea)
2021
Soongsil University
2018
The performance of both organic light-emitting diodes (OLEDs) and solar cells (OSC) depends on efficient coupling between optical far field modes the emitting/absorbing region device. Current approaches towards OLEDs with light-extraction often are limited to single-color emission or require expensive, non-standard substrates top-down structuring, which reduces compatibility large-area light sources. Here, we report integrating solution-processed nano-particle based light-scattering films...
New highly twisted and rigid blue materials composed of anthracene with xylene as the core unit either naphthalene or phenyl end units were synthesized. Non-doped devices using BDNA displayed 5.26% maximum external quantum efficiency CIE color coordinates (x, y: 0.159, 0.072).
Abstract Efficient transparent organic light‐emitting diodes (OLEDs) with improved stability based on conductive, poly(3,4‐ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) electrodes are reported. Based optical simulations, the device structures carefully optimized by tuning thickness of doped transport layers and electrodes. As a result, performance PEDOT:PSS‐based OLEDs reaches that indium tin oxide (ITO)‐based reference devices. The efficiency long‐term significantly improved....
An industrial-grade polyethylene naphthalate (PEN) substrate is explored as a simple, cost-effective platform for high-efficiency organic light-emitting diodes (OLEDs). Its high refractive index, combined with the built-in scattering properties inherent to version, allows significant enhancement in outcoupling without any extra structuring or special optical elements. Flexible, color-stable OLEDs efficiency close 100 lm W−1 are demonstrated. As service our authors and readers, this journal...
Stretchable sensors based on conductive hydrogels have attracted considerable attention for wearable electronics. However, their practical applications been limited by the low sensitivity, high hysteresis, and long response times of hydrogels. In this study, we developed high-performance poly(vinyl alcohol) (PVA)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) post-treated with NaCl, which showed excellent mechanical properties, fast electrical response, ultralow...
A new POSS (polyhedral oligomeric silsesquioxane)-substituted polyfluorene was synthesized from the nickel-catalyzed Yamamoto coupling reaction. The polymers could be well characterized by 1H NMR, FT-IR, and elemental analysis. PL spectra of PFPOSSs on quartz film showed reduced aggregation/excimer formation because bulky group prohibited interchain interactions. This effective dilution effect high thermal stability unit also improved color blue emission even after annealing at 150 °C....
Mitogen-activated protein kinase (MAPK) phosphatase-1 (MKP-1) is a dual-specificity phosphatase that involved in the regulation of cell survival, differentiation and apoptosis through inactivating MAPKs by dephosphorylation. Here, we provide evidence for role MKP-1 glutamate-induced death HT22 hippocampal cells primary mouse cortical neurons. We suggest that, during oxidative stress, C (PKC) delta becomes activated induces sustained activation extracellular signal-regulated 1/2 (ERK1/2)...
We report a significant enhancement and reduced efficiency roll-off in blue white phosphorescent organic light-emitting diodes (PHOLEDs) based on mixed host structure. The combination of hole-transport-type an electron-transport-type as emissive layer resulted effective charge carrier injection distribution the recombination zone, therefore highly efficient PHOLEDs with peak external quantum power efficiencies 21.6% 44.9 lm/W were achieved. Moreover, structure showed 37 lm/W, which is over...
The p53 tumor suppressor protein is a key regulator of cellular functions including responses to numerous stress signals, and triggers apoptosis in many cell types, neurons. major mechanisms known regulate stabilization activation include phosphorylation ubiquitin ligase-mediated proteasomal degradation. Cyclin-dependent kinase 5 (Cdk5), proline-directed serine/threonine kinase, most active the central nervous system plays variety roles neuronal degeneration. Here, we demonstrate for first...
An organic conductive polymer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), is an attractive candidate for a low-cost, low-temperature, and solution-processed electrode material achieving high-performance flexible stretchable thin-film devices. Unlike most materials, this water-soluble conjugated polymer highly stable against chemical physical exposure. It exhibits the superior mechanical flexibility highest optical transparency electrical conductivity among all...
To improve the viewing angle characteristic as well light extraction effect of strong microcavity devices, we fabricated a nanoporous polymer film (NPF) scattering medium component. We designed two types organic emitting diodes (OLEDs) with by changing thickness hole transport layer (HTL; e.g. 30 nm and 60 nm) to investigate different effects NPF. Very interestingly, could observe significant enhancement external quantum efficiency (EQE) for each device (30 thick HTL: 18.0%, 31.6%) when...
Abstract Transparent organic light‐emitting diodes (TOLEDs) are exciting next‐generation electronic devices that can be embedded and integrated into walls, windows, head‐up panels in commercial domestic buildings, cars, planes, other segments of the consumer goods sector. TOLEDs also fundamental components for realization stacked OLEDs various industrial research applications. Furthermore, futuristic smart wearables clothing as well medical purposes will benefit remarkably from development...
Skin-attachable conductive materials have attracted significant attention for use in wearable devices and physiological monitoring applications. Soft, skin-like films must excellent mechanical electrical characteristics with on-skin conformability, stretchability, robustness to detect body motion biological signals. In this study, a conductive, stretchable, hydro-biodegradable, highly robust cellulose/poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) hybrid film is...
This study presents a method to prepare stretchable, conductive, water-permeable, and recyclable hybrid films using hydroxyethyl cellulose PEDOT:PSS for eco-friendly sensors, with high sensitivity, low power consumption, hysteresis.
A series of novel organic semiconducting polymers composed fluorene and bis(2-phenyl-2-cyanovinyl)-10-hexylphenothiazine) (PZB) comonomer were synthesized characterized. These found to be thermally stable readily soluble in common solvents. Our results showed that the color light emitted by homopolymer, poly(9,9-dioctylfluorene-2,7-diyl) (PDOF), could easily tuned incorporating PZB comonomer, which has a narrower band gap. The photoluminescence (PL) emission spectra copolymers highly...
Conventional planar organic light‐emitting diodes (OLEDs) suffer from poor light extraction due to the total internal reflection at waveguided interfaces. Therefore, development of efficient structures is great necessity and significance realize practical applications in large area cost‐effective sources. In this paper, a high‐performance outcoupling system for white OLEDs with spontaneously formed metal oxide nanostructures developed. The fabrication process simple can be scaled...
The authors report scalable growth of free-standing graphene wafers with copper(Cu) catalyst on SiO2/Si substrate at low temperature and investigation their thermal conductivity. Cu is the most common cheapest among electronic materials. Our process for producing based a low-pressure, fast-heating chemical vapor deposition method. Thermal conductivity measurements nondestructive Raman spectroscopy showed that free-standing-graphene good conductor. possibility growing wafer temperatures by...
We propose and fabricate a random light scattering layer for extraction in organic light-emitting diodes (OLEDs) with silver nanodots, which were obtained by melting nanowires. The OLED the as an internal structure was enhanced 49.1% integrated external quantum efficiency (EQE). When wrinkle is simultaneously used structure, total enhancement of EQE 65.3%. maximized to 65.3% at current level 2.0 mA/cm2. By applying OLED, variance emission spectra negligible over broad viewing angle. Power...