A5103266119- Advanced Sensor and Energy Harvesting Materials
- Luminescence and Fluorescent Materials
- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Neuroscience and Neural Engineering
- Carbon Nanotubes in Composites
- Laser-Plasma Interactions and Diagnostics
- Tactile and Sensory Interactions
- Gas Sensing Nanomaterials and Sensors
- Metamaterials and Metasurfaces Applications
- Solar-Powered Water Purification Methods
- Anodic Oxide Films and Nanostructures
- Advanced Electron Microscopy Techniques and Applications
- Advancements in Battery Materials
- Gold and Silver Nanoparticles Synthesis and Applications
- Modular Robots and Swarm Intelligence
- Plasmonic and Surface Plasmon Research
- 3D Printing in Biomedical Research
- Semiconductor materials and devices
- Thermal Radiation and Cooling Technologies
- Quantum Dots Synthesis And Properties
- Laser-induced spectroscopy and plasma
- Conducting polymers and applications
- Advanced Materials and Mechanics
- Graphene research and applications
Northwestern University
2019-2024
Sungkyunkwan University
2013-2023
Korea Electrotechnology Research Institute
2006-2022
Korea Advanced Institute of Science and Technology
2014-2022
University of Waterloo
2022
Kyushu University
2016-2021
Government of the Republic of Korea
2017-2019
Daejeon University
2019
Chevron (China)
2019
Suwon Research Institute
2018
Abstract Aromatic organic deep-blue emitters that exhibit thermally activated delayed fluorescence (TADF) can harvest all excitons in electrically generated singlets and triplets as light emission. However, blue TADF generally have long exciton lifetimes, leading to severe efficiency decrease, i.e., rolloff, at high current density luminance by annihilations light-emitting diodes (OLEDs). Here, we report a emitter employing simple molecular design, which an activation energy well spin–orbit...
The sensitivity of a nanoscale crack-based sensor is enhanced markedly by modulating the crack depth. crack-depth-propagated exhibits ≈16 000 gauge factor at 2% strain and superior signal-to-noise ratio ≈35, which facilitates detection target signals for voice-pattern recognition.
The development of efficient metal-free organic emitters with thermally activated delayed fluorescence (TADF) properties for deep-blue emission is still challenging. A new family TADF based on a donor–acceptor architecture has been developed. electronic interaction between donor and acceptor plays key role in the mechanism. Deep-blue OLEDs fabricated these achieved high external quantum efficiencies over 19.2 % CIE coordinates (0.148, 0.098).
Abstract By simple modification of the functional groups on donor unit, thermally activated delayed fluorescence (TADF) properties emitters can easily be manipulated. A series deep blue to emissive TADF derivatives is developed, capable deep‐blue emissions from 403 460 nm in toluene. Deep‐blue organic light‐emitting diodes (OLEDs) based this are fabricated, resulting an electroluminescence peak at 428 and a high external quantum efficiency up 10.3%. One OLED has achieved commission...
3D multifunctional frameworks, as flexible a single strand of silk, modulate and measure neural activity brain spheroids.
Abstract Owing to the growing demand for highly integrated electronics, anisotropic heat dissipation of thermal management material is a challenging and promising technique. Moreover, satisfy needs advancing flexible stretchable electronic devices, maintaining high conductivity during deformation materials at issue. Presented here an effective assembly technique realize continuous array boron nitride (BN) nanosheets on tetrahedral structures, creating 3D paths with deformable electronics....
Abstract Tactile function is essential for human life as it enables us to recognize texture and respond external stimuli, including potential threats with sharp objects that may result in punctures or lacerations. Severe skin damage caused by severe burns, cancer, chemical accidents, industrial accidents the structure of tissue well nerve system, resulting permanent tactile sensory dysfunction, which significantly impacts an individual’s daily life. Here, we introduce a fully-implantable...
Near-infrared (NIR) organic light-emitting devices have aroused increasing interest because of their potential applications such as information-secured displays, photodynamic therapy, and optical telecommunication. While thermally activated delayed fluorescent (TADF) emitters been used in a variety high-performance diodes (OLEDs) emitting the visible spectral range, efficient NIR TADF materials rarely reported. Herein, we designed synthesized novel solution-processable dimeric...
Abstract Much effort has been devoted to developing highly efficient organic light‐emitting diodes (OLEDs) that function through phosphorescence or thermally activated delayed fluorescence (TADF). However, host materials for blue TADF and phosphorescent guest emitters are limited because of their requirement high triplet energy levels. Herein, we report the rigid acceptor unit benzimidazobenzothiazole (BID‐BT), which is suitable use in bipolar hosts OLEDs. The designed materials, based on...
Abstract A family of organic emitters with a donor–σ–acceptor (D‐σ‐A) motif is presented. Owing to the weakly coupled D‐σ‐A intramolecular charge‐transfer state, transition from localized excited triplet state ( 3 LE) and CT) singlet 1 occurred small activation energy high photoluminescence quantum efficiency. Two thermally activated delayed fluorescence (TADF) components were identified, one which has very short lifetime 200–400 ns other longer TADF order microseconds. In particular, two...
The practical limits of coinage-metal-based plasmonic materials demand sustainable, abundant alternatives with a wide range the solar energy spectrum. Aluminum (Al) is an emerging alternative, but its instability in aqueous environments critically applicability to various light-harvesting systems. Here, we report design strategy achieve robust platform for plasmon-enhanced light harvesting using Al nanostructures. incorporation mussel-inspired polydopamine nanolayers nanoarrays allowed...
Abstract Implantable deep brain stimulation (DBS) systems are utilized for clinical treatment of diseases such as Parkinson’s disease and chronic pain. However, long-term efficacy DBS is limited, neuroplastic changes associated therapeutic mechanisms not well understood. Fundamental mechanistic investigation, typically accomplished in small animal models, difficult because the need stimulators that currently require either frequent handling test subjects to charge battery-powered or...
Abstract Human nonverbal communication tools are very ambiguous and difficult to transfer machines or artificial intelligence (AI). If the AI understands mental state behind a user’s decision, it can learn more appropriate decisions even in unclear situations. We introduce Brain–AI Closed-Loop System (BACLoS), wireless interaction platform that enables human brain wave analysis transfers results verify enhance decision-making. developed earbud-like electroencephalography (EEG) measurement...
Core–shell plasmonic nanohybrids are synthesized through a simple solutionbased process utilizing mussel-inspired polydopamine (PDA). The multi-purpose PDA not only facilitates metal formation, but also serves as scaffold to incorporate photosensitizers around the cores, well an adhesive between and substrate. resulting assembly exhibits highly enhanced light absorption in photo catalytic systems augment artificial photosynthesis. As service our authors readers, this journal provides...
Soft, wireless sensors monitor the temperature and interface pressure of patient’s skin for compression therapy.
Abstract The refractive index is the fundamental property of all optical materials and dictates Snell’s law, propagation speed, wavelength, diffraction, energy density, absorption emission light in materials. Experimentally realized broadband indices remain <40, even with intricately designed artificial media. Herein, we demonstrate a measured >1,800 resulting from mesoscopic crystal dielectric constant greater than three million. This gigantic enhancement effect originates...
Nanoscale-crack-based sensor achieves remarkable durability through the use of a self-healable polymer.
Abstract Solar‐thermal materials have been intensively studied in the context of production and localization thermal energy, targeting an industry level application. Although photonic optical strategies for enhancing light absorption increased efficiency photo excitation/conversion into most them several limitations such as large area fabrication, stability broadband/omnidirectional absorption. In this study, a gold‐coated hierarchical nanoturf membrane (Au/h‐Nanoturf membrane) incorporated...
Abstract As eidetic signal recognition has become important, displaying mechanical signals visually imposed huge demands for simple readability and without complex processing. Such visualization of is used in delicate urgent medical or safety‐related industries. Accordingly, chromic materials are considered to facilitate with multiple colors process. However, the response recovery time very long, such that rapid regular unable be detected, i.e., physiological signals, as respiration. Here,...
Thermally activated delayed fluorescence (TADF) based on through-space donor and acceptor interactions constitute a recent promising approach to develop efficient TADF emitters. Novel isomers using dithia[3.3]-paracyclophane building block as versatile 3D platform promote are presented. Such allows bring together the D A units into close proximity probe effect of their orientation, contact site distance emission properties. This study provides evidence that dithia[3.3]paracyclophane core is...