A5100430921- Luminescence and Fluorescent Materials
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Photochemistry and Electron Transfer Studies
- Perovskite Materials and Applications
- Photochromic and Fluorescence Chemistry
- Supramolecular Self-Assembly in Materials
- Molecular Sensors and Ion Detection
- Liquid Crystal Research Advancements
- Porphyrin and Phthalocyanine Chemistry
- Nonlinear Optical Materials Research
- Polydiacetylene-based materials and applications
- Molecular Junctions and Nanostructures
- Advanced Photocatalysis Techniques
- Photorefractive and Nonlinear Optics
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Photonic and Optical Devices
- Synthesis and properties of polymers
- Supramolecular Chemistry and Complexes
- Analytical Chemistry and Sensors
- biodegradable polymer synthesis and properties
Kyungpook National University Hospital
2012-2025
Seoul National University
2015-2024
Samsung (South Korea)
2001-2024
Seoul National University Hospital
2010-2022
University of Chicago
2014-2022
Seoul Institute
2017-2021
Government of the Republic of Korea
2016-2021
Columbia University
2018-2021
University of Seoul
2014-2020
Northern Netherlands Provinces alliance
2013-2020
A new class of organic nanoparticles (CN-MBE nanoparticles) with a mean diameter ca. 30−40 nm, which exhibit strongly enhanced fluorescence emission, were prepared by simple reprecipitation method. CN-MBE (1-cyano-trans-1,2-bis-(4'-methylbiphenyl)ethylene) is very weakly fluorescent in solution, but the intensity increased almost 700 times nanoparticles. Enhanced emission attributed to synergetic effect intramolecular planarization and J-type aggregate formation (restricted excimer...
Recently, organic fluorescent molecules harnessing the excited-state intramolecular proton transfer (ESIPT) process are drawing great attention due to their unique photophysical properties which facilitate novel optoelectronic applications. After a brief introduction ESIPT and related photophysical properties, molecular design strategies towards tailored emission discussed in relation theoretical aspects. Subsequently, recent studies on advanced applications surveyed, particularly focusing...
Color tuning and switching of the solid-state luminescence organic materials are attractive subjects for both fundamental research practical applications such as optical recording. We report herein cyanostilbene-based highly luminescent molecular sheets which exhibit two-color fluorescence in response to pressure, temperature, solvent vapor. The origin multistimuli is two-directional shear-sliding capability sheets, formed via intermolecular multiple C−H···N C−H···O hydrogen bonds. resulting...
π-Conjugated organic molecules represent an attractive platform for the design and fabrication of a wide range nano- microstructures use in optoelectronics. The desirable optical electrical properties π-conjugated these applications depend on their primary molecular structure intermolecular interactions such as packing or ordering condensed states. Because difficulty satisfying rigorous structural requirements photoluminescence charge transport, development novel high-performance systems...
Phosphorescent Ir(III) complexes attract enormous attention because they allow highly efficient electrophosphorescence. In pursuing the development of during last decade, significant progress has been made in terms colour-tunability, thermal- and photo-stability, phase homogeneity, phosphorescence efficiency. By far, extensive synthetic efforts have focused on molecular design ligands to achieve a wide range colour that is compatible with organic light-emitting device (OLED) applications....
White-light-emitting single molecules are promising materials for use in a new generation of displays and light sources because they offer the possibility simple fabrication with perfect color reproducibility stability. To realize white-light emission at molecular scale, thereby eliminating detrimental concentration- or environment-dependent energy transfer problem conventional fluorescent phosphorescent systems, between larger band-gap donor smaller acceptor must be fundamentally blocked....
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStrongly Fluorescent Organogel System Comprising Fibrillar Self-Assembly of a Trifluoromethyl-Based Cyanostilbene DerivativeByeong-Kwan An, Deug-Sang Lee, Jong-Soon Yil-Sung Park, Hyung-Su Song, and Soo Young ParkView Author Information School Materials Science Engineering, ENG445, Seoul National University, San 56-1, Shillim-dong, Kwanak-ku, 151-744, Korea, Central R&D center, Dongwoo FineChem Co., Ltd., 1177, Pyungtaek-Si, Kyunggi-Do,...
Get turned on: Fluorescent photochromic organic nanoparticles (FPONs) of 1 (see picture) show a strongly enhanced fluorescence emission with increasing concentration and bistable photochromism. High-contrast on/off switching has been successfully implemented in size-tuned FPONs also photo-rewritable polymer film highly loaded 1. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2004/z461172_s.pdf or from author. Please note: The...
We report a novel color tuning methodology in the electrophosphorescent iridium complex by substituting one cyclometalating ligand to an ancillary as emitting center. Highly efficient exothermic inter-ligand energy transfer (ILET) from MLCT3 state produced between and 2-(2,4-difluorophenyl)pyridine LX3 of offers chance access wider range sky blue (478 nm) red (666 nm). Characteristic shapes photoluminescence spectra, strong solvatochromic phenomena well DFT calculations gave evidences for this ILET.
The last few years have seen a steady increase in small molecule based conjugated materials, which promise innovative (opto)electronic applications. This requires however systematic understanding of structure–property relationships, can only be achieved via libraries structurally well-defined single crystalline materials on systematically designed molecular structures. In this feature article, we are presenting relationships functionalized distyrylbenzene (DSB), is one the most extensively...
We have synthesized a novel class of imidazole-based excited-state intramolecular proton-transfer (ESIPT) materials, i.e., hydroxy-substituted tetraphenylimidazole (HPI) and its derivative HPI-Ac, which formed large single crystals exhibiting intense blue fluorescence amplified spontaneous emission (ASE). Transparent, clear, well-defined fluorescent HPI-Ac as 20 mm × 25 5 were easily grown from dilute solution. From the X-ray crystallographic analysis semiempirical molecular orbital...
We have designed and synthesized asymmetric cyano-stilbene derivatives containing trifluoromethyl (-CF(3)) substituents with the aim of producing tightly packed pi-dimer systems that as crystals exhibit reversible [2 + 2] cycloaddition characteristic fluorescence modulation. (Z)-3-(3',5'-Bis(trifluoromethyl)biphenyl-4-yl)-2-(4'-(trifluoromethyl)biphenyl-4-yl)acrylonitrile (CN(L)-TrFMBE) its were found to form antiparallel stacks in due their specific intermolecular interactions, including...
We have rationally designed a densely packed 1:1 donor-acceptor (D-A) cocrystal system comprising two isometric distyrylbenzene- and dicyanodistyrylbenzene-based molecules, forming regular one-dimensional mixed stacks. The crystal exhibits strongly red-shifted, bright photoluminescence originating from an intermolecular charge-transfer state. peculiar electronic situation gives rise to high ambipolar p-/n-type field-effect mobility up 6.7 × 10(-3) 10(-2) cm(2) V(-1) s(-1), respectively, as...
Understanding the role of self-assembly and electronic interactions constituent molecules in determining optoelectronic properties a molecular solid is fundamental essential issue material science. Particularly, correlation between stacking mode modulated optical has barely been established spite its scientific technological importance. Herein, we present dicyanodistyrylbenzene-based highly luminescent crystals which uniquely exhibit polymorphism mechanochromism. In these materials, various...
A phosphorescent sensor based on a multichromophoric iridium(III) complex was synthesized and characterized. The construct exhibits concomitant changes in its phosphorescence intensity ratio lifetime response to copper(II) ion. sensor, which is reversible selective, able quantify ions aqueous media, it detects intracellular copper ratiometrically.
Materials design has become a vigorous aspect for organic solid‐state lasing, which often lacks fundamental understanding of structure–property relationships. The development such an is undertaken in this progress report, systematically explores the now‐available libraries single crystals exhibiting light amplification under optical pumping. By doing so, intra‐ and intermolecular contributions are disentangled non‐/occurrence, type, threshold, wavelength, polarization processes, opening path...
A novel donor–acceptor–donor triad that exhibits fluorescence on–off switching with high contrast ratio (ca. 103) in response to a mechanical stimulus the solid state is reported. This system provides very unique example of high-contrast driven by mechanical-force-controlled photo-induced electron transfer (eT) molecular assemblies. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made...
Abstract Luminescent small, all‐organic molecules are of tremendous interest in materials and life science applications. Nevertheless, targeted design requires a basic understanding the excited state deactivation pathways themselves, modulations processes that occur solid state. This particularly concerns crystalline molecular solids, as here not only solid‐state rigidification contributes to these modulations, but specific intermolecular interactions well. Starting from properties, this...
An efficient bulk heterojunction all-small-molecule organic solar cell composed of a high-performance small-molecule donor and self-assembling nonfullerene acceptor is demonstrated. Favorable nanoscale phase separation enhanced charge carrier generation with transport in this donor–acceptor system assures maximum power conversion efficiency 5.4%. As service to our authors readers, journal provides supporting information supplied by the authors. Such materials are peer reviewed may be...
Genome-wide association studies have revealed >60 loci associated with type 2 diabetes (T2D), but the underlying causal variants and functional mechanisms remain largely elusive. Although in TCF7L2 confer strongest risk of T2D among common by presumed effects on islet function, molecular are not yet well understood. Using RNA-sequencing, we identified a TCF7L2-regulated transcriptional network responsible for its effect insulin secretion rodent human pancreatic islets. ISL1 is primary target...
A well-organized donor–acceptor crystalline structure is examined for high performance nonfullerene solar cells. By thermal annealing, nanoscale structures of both donor and acceptor domains are successfully modulated, followed by significant changes in the resulting photovoltaic characteristics. When annealed at 90 °C, a maximum power conversion efficiency 7.64% with remarkable open-circuit voltage 1.03 V obtained. As service to our authors readers, this journal provides supporting...
Organic electrodes have attracted significant attention as alternatives to conventional inorganic in terms of sustainability and universal availability natural systems. However, low working voltages energy densities are inherent limitations cathode applications. Here, we propose a high-energy organic using quinone-derivative, C6Cl4O2, for use sodium-ion batteries, which boasts one the highest average among sodium batteries (∼2.72 V vs Na/Na+). It also utilizes two-electron transfer provide...