A5042183695- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Perovskite Materials and Applications
- Thin-Film Transistor Technologies
- Quantum Dots Synthesis And Properties
- Luminescence and Fluorescent Materials
- Advanced Sensor and Energy Harvesting Materials
- Advancements in Solid Oxide Fuel Cells
- Green IT and Sustainability
- Graphene research and applications
- ZnO doping and properties
- Nanofabrication and Lithography Techniques
- Advanced Battery Technologies Research
- Molecular Junctions and Nanostructures
- Advanced battery technologies research
- Recycling and Waste Management Techniques
- Extraction and Separation Processes
- Advancements in Battery Materials
- 3D Printing in Biomedical Research
- Nanomaterials and Printing Technologies
- 2D Materials and Applications
- Transition Metal Oxide Nanomaterials
Seoul National University
2010-2025
Anyang University
2020-2024
Hanyang University
2020-2024
Pusan National University
2020-2021
Nissan (United States)
2011-2020
University of California, Los Angeles
2020
Pohang University of Science and Technology
2011-2016
University of North Dakota
2008-2010
Highly efficient organic/inorganic hybrid perovskite light-emitting diodes (PeLEDs) based on graphene anode are developed for the first time. Chemically inert avoids quenching of excitons by diffused metal atom species from indium tin oxide. The flexible PeLEDs with plastic substrate show good bending stability; they provide an alternative and reliable electrode highly PeLEDs.
Electron‐injecting interlayers (ILs) which are stable in air, inject electrons efficiently, block holes, and quenching of excitons, very important to realize efficient inverted polymer light‐emitting diodes (IPLEDs). Two air‐stable electron‐injecting (ILs), branched polyethyleneimine (PEI) ethoxylated (PEIE) for use IPLEDs introduced, the roles ILs comparing these with a conventional Cs 2 CO 3 IL elucidated. These can reduce electron injection barrier between ZnO emitting layer by decreasing...
Abstract Graphene-based organic light-emitting diodes (OLEDs) have recently emerged as a key element essential in next-generation displays and lighting, mainly due to their promise for highly flexible light sources. However, efficiency has been, at best, similar that of conventional, indium tin oxide-based counterparts. We here propose an ideal electrode structure based on synergetic interplay high-index TiO 2 layers low-index hole-injection sandwiching graphene electrodes, which results...
Although several transparent conducting materials such as carbon nanotubes, graphene, and polymers have been intensively explored flexible electrodes in optoelectronic devices, their insufficient electrical conductivity, low work function, complicated electrode fabrication processes limited practical use. Herein, a 2D titanium carbide (Ti3 C2 ) MXene film with (TCE) properties, including high conductivity (≈11 670 S cm-1 function (≈5.1 eV), which are achieved by combining simple solution...
In this paper, equivalent electric circuit models of a commercial 1.2-kW proton exchange membrane (PEM) fuel cell stack are proposed based on AC impedance studies. The PEM was operated using room air and pure hydrogen (99.995%). Using electrochemical spectroscopy (EIS) technique, data were collected in the laboratory under various loading conditions. Impedance analyzed developed basic elements like resistors inductors, distributed such as Warburg constant-phase elements. A nonlinear...
Although solution processing of small-molecule organic light-emitting diodes (OLEDs) has been considered as a promising alternative to standard vacuum deposition requiring high material and cost, the devices have suffered from low luminous efficiency difficulty multilayer processing. Therefore, should be achieved in simple-structured OLEDs fabricated using process. We report very efficient solution-processed that use novel universal electron-transporting host materials based on...
We report a unique and highly stable electrocatalyst-platinum (Pt) supported on titanium-ruthenium oxide (TRO)-for hydrogen fuel cell vehicles. The Pt/TRO electrocatalyst was exposed to stringent accelerated test protocols designed induce degradation failure mechanisms identical those seen during extended normal operation of automobile-namely, support corrosion vehicle startup shutdown, platinum dissolution acceleration deceleration. These experiments were performed both ex situ (on supports...
Abstract Making small nanograins in polycrystalline organic–inorganic halide perovskite (OIHP) films is critical to improving the luminescent efficiency light‐emitting diodes (PeLEDs). 3D OIHPs have fundamental limitations related exciton binding energy and diffusion length. At same time, passivating defects at grain boundaries also when size becomes smaller. Molecular additives can be incorporated shield suppress boundaries; however, unevenly distributed molecular cause imbalanced charge...
Abstract Mechanically resilient optoelectronic devices are relevant for a wide range of applications, including portable and wearable devices. Perovskite thin film‐based suitable choice designing such systems as it demonstrates high performance while preserving moderate mechanical compliance. Yet its property can be improved further by integrating the energy dissipation system self‐healing ability into film. Copolymers containing Lewis‐base functional groups, elastomer chains, cyclic...
Making light work: Polymer-based compositions with a perfluorinated ionomer (PFI) as hole injection/extraction layers are introduced for organic LEDs and photovoltaic cells. The work functions of the formed by single spin-coating could be tuned to improve device efficiency lifetime. effects PFI surface on charge lifetime were investigated. Detailed facts importance specialist readers published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made...
Abstract We report effective solution‐processed chemical p‐type doping of graphene using trifluoromethanesulfonic acid (CF 3 SO H, TFMS), that can provide essential requirements to approach an ideal flexible anode for practical applications: i) high optical transmittance, ii) low sheet resistance (70 % decrease), iii) work function (0.83 eV increase), iv) smooth surface, and air‐stability at the same time. The TFMS‐doped formed nearly ohmic contact with a conventional organic hole...
This review focuses on the importance and key functions of anode interfacial layers based conducting polymers in organic organic–inorganic hybrid perovskite optoelectronics. Insertion a buffer layer between electrode semiconducting is most common effective way to control properties eventually improve device characteristics, such as luminous efficiency light‐emitting diodes power conversion solar cells. Conducting are considered one promising materials for future electronics because...
A novel flexible encapsulation method (Flex Lami-capsulation) is reported, which can be applied in the roll-to-roll process for mass production of organic electronic devices. Flex Lami-capsulation very simple, fast, and getter-free, as effective glass encapsulation. Use this feasible large-area displays does not have drawbacks conventional methods.
Although the luminous efficiency has been significantly improved in multilayered organic light-emitting diodes (OLEDs), understanding major factors that influence degradation of OLEDs remains a challenge due to their complex device structure. In this regard, we elucidate crucial role hole injection layer (HIL) by using systematically controlled interfaces. To analyze charge dependent mechanism OLEDs, fabricate small-molecule with molecularly HILs. reduced energy barrier greatly improves both...
Flexible transparent electrode materials such as conducting polymers, silver nanowires, carbon nanotubes and graphenes are being investigated possible replacements for conventional brittle inorganic electrodes. However, they have critical drawbacks of low work function (WF), resulting in a high hole injection barrier to an overlying semiconducting layer simplified organic or organic–inorganic hybrid perovskite light-emitting diodes (OLEDs PeLEDs). Here, we report new anode material (AnoHIL)...
This paper introduces a method for improving the sensitivity to NO2 gas of p-type metal oxide semiconductor sensor. The sensor was fabricated using CuO nanowires (NWs) grown through thermal oxidation and decorated with ZnO nanoparticles (NPs) sol-gel method. heterojunction exhibited better than pristine in CuO/ZnO sensors caused decrease width hole accumulation layer (HAL) an increase initial resistance. possibility influence HAL helped improve sensing characteristics growth morphology,...
A series of electrospun nanofiber mat electrodes with two different commercial Pt/C catalysts and a binder Nafion poly(acrylic acid) were fabricated evaluated. The assembled into membrane-electrode-assemblies (MEAs) using 211 as the membrane. Variations in catalyst type, composition (the ratio to Nafion), fiber diameter had little or no impact on hydrogen/air fuel cell power output. 25 cm2 sprayed gas diffusion electrode MEAs compared terms beginning life (BoL) end (EoL) performance after...
We used various nondestructive analyses to investigate host material systems in the emitting layer (EML) of simple-structured, green phosphorescent organic light-emitting diodes (OLEDs) clarify how affect its luminous efficiency (LE) and operational stability. An OLED that has a unipolar single-host EML with conventional poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) showed high operating voltage, low LE (∼26.6 cd/A, 13.7 lm/W), short lifetime (∼4.4 h @ 1000 cd/m2)....
With the rapid growth of volume spent Li-ion batteries (LIBs), recycling LIBs has attracted significant attention in recent years for future sustainability. In particular, there remains a great need development scalable and environment-friendly separation process to recycle valuable cathode active materials from electrode scraps. this work, froth flotation technique was adopted separate mixture anode materials. To evaluate whether recovered maintain their functional integrity after developed...
Light-Emitting Diodes In article number 2405272, Tae-Woo Lee and co-workers report on a high-performance perovskite light-emitting diode device achieved through the introduction of 1,8-octanedithiol (ODT). This additive effectively passivates defects within MAPbBr3 emitter at interface with hole injection layer. The inset illustrates how ODT prevents exciton quenching by defect passivation, significantly enhancing luminescent properties efficiency.
Abstract It is a great challenge to develop solution‐processed, polymeric hole‐injection layers (HILs) that perform better than small molecular for realizing high‐performance small‐molecule organic light‐emitting diodes (SM‐OLEDs). We have greatly improved the injection efficiency and current of SM‐OLEDs by introducing conducting polymer compositions composed polyaniline doped with polystyrene sulfonate perfluorinated ionomer (PFI) as HIL. During single spin‐coating compositions, PFI layer...
The use of flexible organic light-emitting diodes (OLEDs) for the next-generation displays and solid-state lightings has been considered, but widely used transparent conducting electrode (TCE), indium–tin-oxide (ITO), should be replaced by electrodes due to its brittleness increasing cost. Therefore, many kinds alternative TCEs have increasingly studied. In this paper, properties applications candidate classified into four categories (conducting polymer, silver nanowire, carbon nanotube...