A5061341015- Advanced Sensor and Energy Harvesting Materials
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Organic Light-Emitting Diodes Research
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Combustion and flame dynamics
- Tactile and Sensory Interactions
- Neuroscience and Neural Engineering
- Coagulation and Flocculation Studies
- Advanced Memory and Neural Computing
- Nanocluster Synthesis and Applications
- Nanowire Synthesis and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Surface Modification and Superhydrophobicity
- ZnO doping and properties
- 2D Materials and Applications
- Organic Electronics and Photovoltaics
- Graphene and Nanomaterials Applications
- Advanced Materials and Mechanics
- Nanomaterials and Printing Technologies
- 3D Printing in Biomedical Research
- CCD and CMOS Imaging Sensors
- Hydrogels: synthesis, properties, applications
- Nanofabrication and Lithography Techniques
Ulsan National Institute of Science and Technology
2019-2025
Institute for Basic Science
2015-2024
Government of the Republic of Korea
2020
University of California, Berkeley
2019
Lawrence Berkeley National Laboratory
2019
Seoul National University
2001-2018
Northwestern University
2013
Indiana University – Purdue University Indianapolis
2013
Indiana University School of Medicine
2013
Collaborative Innovation Center of Chemistry for Energy Materials
2010
Abstract Deformable full-colour light-emitting diodes with ultrafine pixels are essential for wearable electronics, which requires the conformal integration on curvilinear surface as well retina-like high-definition displays. However, there remaining challenges in terms of polychromatic configuration, electroluminescence efficiency and/or multidirectional deformability. Here we present ultra-thin, colloidal quantum dot diode arrays utilizing intaglio transfer printing technique, allows...
Soft bioelectronic devices provide new opportunities for next-generation implantable owing to their soft mechanical nature that leads minimal tissue damages and immune responses. However, a form of the optoelectronic device optical sensing retinal stimulation has not been developed yet because bulkiness rigidity conventional imaging modules composing materials. Here, we describe high-density hemispherically curved image sensor array leverages atomically thin MoS2-graphene heterostructure...
Abstract In the future electronics, all device components will be connected wirelessly to displays that serve as information input and/or output ports. There is a growing demand of flexible and wearable displays, therefore, for input/output next-generation consumer electronics. Among many kinds light-emitting devices these quantum dot diodes (QLEDs) exhibit unique advantages, such wide color gamut, high purity, brightness with low turn-on voltage, ultrathin form factor. Here, we review...
We herein report on the large-scale synthesis of ultrathin Bi2Te3 nanoplates and subsequent spark plasma sintering to fabricate n-type nanostructured bulk thermoelectric materials. were synthesized by reaction between bismuth thiolate tri-n-octylphosphine telluride in oleylamine. The thickness was ∼1 nm, which corresponds a single layer crystals. materials prepared surfactant-removed using sintering. found that grain size density strongly dependent temperature, we investigated effect...
Colloidal nanocrystals have been intensively studied over the past three decades due to their unique properties that originate, in large part, from nanometer-scale sizes. For applications electronic and optoelectronic devices, colloidal nanoparticles are generally employed as assembled nanocrystal solids, rather than individual particles. Consequently, tailoring 2D patterns well 3D architectures of is critical for various micro- nanoscale devices. Here, recent advances designed assembly,...
An ultrathin skin-attachable display is a critical component for an information output port in next-generation wearable electronics. In this regard, quantum dot (QD) light-emitting diodes (QLEDs) offer unique and attractive characteristics future displays, including high color purity with narrow bandwidths, electroluminescence (EL) brightness at low operating voltages, easy processability. Here, QLED displays that utilize passive matrix to address individual pixels are reported. The...
Biomimetic miniaturized suction cups (mSCs) are designed for the patient friendly, dry adhesives of smart medical skin. Both strong van der Waals force and induced negative pressure by ultrasoft mSCs facilitate tight skin coupling without discomfort or irritations, improve sensitivities embedded stretchable electronics continuous vital sign monitoring, enable multiple drug reloading loss adhesion. As a service to our authors readers, this journal provides supporting information supplied...
Displaying information on transparent screens offers new opportunities in next-generation electronics, such as augmented reality devices, smart surgical glasses, and windows. Outstanding luminance transparency are essential for "see-through" displays to show vivid images over clear background view. Here quantum dot light-emitting diodes (Tr-QLEDs) reported with high brightness (bottom: ≈43 000 cd m-2 , top: ≈30 total: ≈73 at 9 V), excellent transmittance (90% 550 nm, 84% visible range), an...
Large-scale colloidal synthesis and integration of uniform-sized molybdenum disulfide (MoS2 ) nanosheets for a flexible resistive random access memory (RRAM) array are presented. RRAM using MoS2 shows ≈10 000 times higher on/off ratio than that based on exfoliated . The good uniformity the allows wafer-scale system with pressure sensors quantum-dot light-emitting diodes.
Transparent electrodes have been widely used for various electronics and optoelectronics, including flexible ones. Many nanomaterial‐based electrodes, in particular 1D 2D nanomaterials, proposed as next‐generation transparent electrodes. However, their transparency, conductivity, large‐area uniformity, sometimes cost are not yet sufficient to replace indium tin oxide (ITO). Furthermore, the conventional ITO is quite rigid susceptible mechanical fractures under deformations (e.g., bending,...
Colloidal quantum dots (QDs) exhibit unique characteristics such as facile color tunability, pure emission with extremely narrow bandwidths, high luminescence efficiency, and photostability. In addition, dot light-emitting diodes (QLEDs) feature bright electroluminescence, low turn-on voltage, ultrathin form factor, making them a promising candidate for next-generation displays. To achieve the overarching goal of full-color display based on electroluminescence QDs, however it is essential to...
Graphene has been highlighted as a platform material in transparent electronics and optoelectronics, including flexible stretchable ones, due to its unique properties such optical transparency, mechanical softness, ultrathin thickness, high carrier mobility. Despite huge research efforts for graphene‐based electronic/optoelectronic devices, there are remaining challenges terms of their seamless integration, the high‐quality contact formation, precise alignment micrometer‐scale patterns,...
Flexible and stretchable optoelectronic devices can be potentially applied in displays, biosensors, biomedicine, robotics, energy generation. The use of nanomaterials with superior optical properties such as quantum dots (QDs) is important the realization wearable displays biomedical devices, but specific structural design well selection materials should preferentially accompany this technology to realize forms these devices. Here, we report sensors manufactured using colloidal QDs...
Doping semiconductor nanocrystals with magnetic transition-metal ions has attracted fundamental interest to obtain a nanoscale dilute semiconductor, which unique spin exchange interaction between and exciton. So far, the study on doped NCs usually been conducted larger than 2 nm because of synthetic challenges. Herein, we report synthesis characterization Mn(2+)-doped (CdSe)13 clusters, smallest semiconductors. In this study, single-sized clusters are produced in large scale. Despite their...
High-definition red/green/blue (RGB) pixels and deformable form factors are essential for the next-generation advanced displays. Here, we present ultrahigh-resolution full-color perovskite nanocrystal (PeNC) patterning ultrathin wearable Double-layer transfer printing of PeNC organic charge transport layers is developed, which prevents internal cracking film during process. This results in RGB pixelated patterns 2550 per inch (PPI) monochromic 33,000 line pairs with 100% yield. The...
Synaptic photodetectors exhibit photon-triggered synaptic plasticity, which thus can improve the image recognition rate by enhancing contrast. However, still, visualization and of invisible ultraviolet (UV) patterns are challenging, owing to intense background noise. Here, inspired all-or-none potentiation synapse, we develop an integrated device phototransistors (SPTrs) quantum dot light-emitting diodes (QLEDs), facilitating noise reduction UV through on-device preprocessing. The SPTrs...
Recently, highly conductive polymer nanocomposites, particularly soft have received extensive attention as promising material candidates for wearable devices. Compared with the cases of devices based on conventional rigid electronic materials, nanocomposites exhibit excellent conformal contacts skin due to mechanical properties these nanocomposites; therefore, polymeric can be applied stretchable wirings, electrodes, and sensor units in various on-skin electronics. The types polymers...
Mechanically deformable photodetectors (PDs) are key device components for wearable health monitoring systems based on photoplethysmography (PPG). Achieving high detectivity, fast response time, and an ultrathin form factor in the PD is highly needed next-generation PPG systems. Self-powered operation without a bulky power-supply unit also beneficial point-of-care application. Here, we propose self-powered PDs using heavy-metal-free Cu-In-Se quantum dots (QDs), which enable high-performance...