A5080470222- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Perovskite Materials and Applications
- Electrocatalysts for Energy Conversion
- Molecular Sensors and Ion Detection
- Advanced Photocatalysis Techniques
- Advanced battery technologies research
- Porphyrin and Phthalocyanine Chemistry
- X-ray Diffraction in Crystallography
- Polydiacetylene-based materials and applications
- Crystallization and Solubility Studies
- Chalcogenide Semiconductor Thin Films
- Ammonia Synthesis and Nitrogen Reduction
- Molecular Junctions and Nanostructures
- Nanocluster Synthesis and Applications
- Graphene and Nanomaterials Applications
- Photochromic and Fluorescence Chemistry
- Photoreceptor and optogenetics research
- CO2 Reduction Techniques and Catalysts
- Microbial Fuel Cells and Bioremediation
- Supramolecular Chemistry and Complexes
- Electrochemical Analysis and Applications
- Metalloenzymes and iron-sulfur proteins
Hannam University
2020-2025
Seoul National University
2007-2021
Johannes Kepler University of Linz
2017-2020
Daejeon University
2020
Government of the Republic of Korea
2020
University of Seoul
2014
Inspired by self-repair mechanism of PSII in plants, we report a self-healing system which spontaneously repairs molecular catalyst and photosensitizer during photocatalytic H2 evolution. A bipyridine-embedded UiO-type metal–organic framework (MOF), namely Ptn_Ir_BUiO, incorporated H2-evolving photosensitizer, was synthesized subject to evolution reaction (HER). Impressively, HER with Pt0.1_Ir_BUiO showed very stable photocatalysis without significant decrease its activity colloidal...
We report on a molecularly tailored 1:1 donor-acceptor (D-A) charge-transfer (CT) cocrystal that manifests strongly red-shifted CT luminescence characteristics, as well noteworthy reconfigurable self-assembling behaviors. A loosely packed molecular organization is obtained consequence of the noncentrosymmetric chemical structure molecule A1, which gives rise to considerable free volume and weak intermolecular interactions. The stacking features complex result in an external...
A new 2:1 donor (D):acceptor (A) mixed-stacked charge-transfer (CT) cocrystal comprising isometrically structured dicyanodistyrylbenzene-based D and molecules is designed synthesized. Uniform 2D-type morphology manifested by the exquisite interplay of intermolecular interactions. In addition to its appealing structural features, unique optoelectronic properties are unveiled. Exceptionally high photoluminescence quantum yield (ΦF ≈ 60%) realized non-negligible oscillator strength S1...
Abstract Highly efficient red–green–blue (RGB) tricolor luminescence switching was demonstrated in a bicomponent solid film consisting of (2 Z ,2′ )‐2,2′‐(1,4‐phenylene)bis(3‐(4‐butoxyphenyl)acrylonitrile) (DBDCS) and )‐3,3′‐(2,5‐bis(6‐(9 H ‐carbazol‐9‐yl)hexyloxy)‐1,4‐phenylene)bis(2‐(3,5‐bis(trifluoromethyl)phenyl)acrylonitrile) ( m ‐BHCDCS). Reversible RGB with high ratiometric color contrast λ em =594, 527, 458 nm for red, green, blue, respectively) realized by different external stimuli...
Abstract Supramolecular polymers (SPs) have received great attention because of their potential for various practical applications. As part our search SPs that are highly fluorescent in aqueous media, we designed a system based on cucurbit[8]uril (CB[8]) host and newly cyanostilbene guest. Fluorescence quantum yields ≈0 % the disassembled monomer state 91 CB[8]‐induced SP were obtained. The intriguing photophysical properties elucidated through detailed experimental computational analysis,...
Abstract Artificial photosynthesis has been devised and investigated in pursuit of solving the 21st century's energy problem. Despite significant advances recent decades, applying technology real life is still a challenging subject for scientists. As term “artificial photosynthesis” stems from mimicking natural photosynthesis, we can learn nature's strategies which have evolved over 3.4 billion years. This Review highlights important be borrowed highly efficient robust artificial...
Abstract Supramolecular polymers (SPs) have received great attention because of their potential for various practical applications. As part our search SPs that are highly fluorescent in aqueous media, we designed a system based on cucurbit[8]uril (CB[8]) host and newly cyanostilbene guest. Fluorescence quantum yields ≈0 % the disassembled monomer state 91 CB[8]‐induced SP were obtained. The intriguing photophysical properties elucidated through detailed experimental computational analysis,...
Waterproof complexes: Cationic Ir(III) photosensitizers (PSs) with an ancillary 4,4'-bis(4-(triphenylsilyl)phenyl)-2,2'-bipyridine ligand enabled hydrogen evolution from water high turnover numbers (TONs; see scheme). The peripheral triphenylsilyl moieties prevent substitution by solvent molecules, such as water, and thus increase the durability of complexes. SR=sacrificial reducing agent, WRC=water-reduction catalyst.
Abstract A series of Cu I photosensitizers was synthesized, characterized, and investigated for photocatalytic H 2 evolution from water. structure–property correlation established their catalytic activity photophysical properties, which further elaborated by DFT calculations. new photosensitizer (Cu‐TPAPhen) with triphenylamine‐substituted phenanthroline ligands showed unprecedentedly high turnover numbers 19 000 when tested in combination triethylamine as a sacrificial reagent colloidal Pt...
Combined structural, photophysical, and quantum-chemical studies at the quantum mechanics/molecular mechanics (QM/MM) level precisely reveal structure-property relationships in a mixed-stack donor-acceptor cocrystal, which displays vibronically structured fluorescence, strongly red-shifted against spectra of parent donor acceptor, with high yield despite pronounced CT character emitting state. The study elucidates reasons for this unusual combination, quantifies ordering nature collective...
Abstract Developing electrical organic conductors is challenging because of the difficulties involved in generating free charge carriers through chemical doping. To devise a novel doping platform, capabilities four designed conjugated polymers (CPs) are quantitatively characterized using an AC Hall‐effect device. The resulting carrier density related to degree electronic coupling between CP repeating unit and 2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane (F4‐TCNQ), doped PIDF‐BT...
Green hydrogen, by definition, must be produced with renewable energy sources without using fossil fuels. To transform the system, we need a fully sustainable production of green and as well introduction such "solar fuels" to tackle chemical storage aspect energies. Conventional electrolysis water splitting into oxygen hydrogen gases is clean nonfossil method, but use massive noble-metal electrodes makes it expensive. Direct photocatalytic evolution in an ideal approach, industrial scale not...
To clarify the influence of electron-withdrawing chlorine (Cl) substituents, two benzothiadiazole (BT)-based D–A-type polymers, PBCl-BTT and PBCl-BTTCl, were utilized in non-fullerene polymer solar cells (PSCs). PBCl-BTTCl has an extra Cl atom on BT unit compared to PBCl-BTT. Because Cl, exhibits distinct properties, such as low energy levels, blue-shifted absorption, a larger bandgap. However, despite more chlorine, inverted-type device based displayed lower efficiency (4.32%) than (7.31%)....
Abstract Phonon dynamics are a critical factor to control the optical properties of excited states in light‐emitting materials. Here, we report an extremely slow relaxation photoexcited lattice vibrations enabled by assembling donor‐acceptor (D–A) molecules [2‐(9,9‐dimethylacridin‐10(9H)‐yl)‐9,9‐dimethyl‐9H‐thioxanthene 10,10‐dioxide], namely AC molecules, into dipolar crystal. By using photoexcitation‐modulated Raman spectroscopy, find that crystalline‐lattice monitored Raman‐scattering...
A highly efficient deep red/near-infrared emitting organic solid based on a β-dicyanostyrylbenzene derivative was reported.
We synthesized two different amphiphilic small molecules 1 and 2 by attaching the same oligo(ethylene glycol) (OEG) unit to dicyanodistyrylbenzene (DCS) fluorophore but at positions. These self-assemble into nanoparticles in water show lower critical solution temperature (LCST) 26 58 °C, respectively. Upon heating, transition of hydrophilic coils hydrophobic globules OEG leads change stacking structure luminescent DCS cores. As a result, it shows significant ratiometric fluorescence color...
In this work, a simple but effective molecular design strategy is developed for the generation of intense blue emission in solid state including single crystals through multiple secondary intermolecular interactions such as CF…HC hydrogen bonding. The synthesized novel imidazole‐based excited‐state intramolecular proton transfer (ESIPT) molecule, 2‐(1‐(3,5‐bis(trifluoromethyl)phenyl)‐4,5‐diphenyl‐1H‐imidazol‐2‐yl)phenol (HPI‐CF 3 ), shows significantly enhanced fluorescence crystal (Φ F =...
Intercorrelation of thermoelectric properties a doped conjugated semiconducting polymer (PIDF-BT) with charge carrier density, conductive morphology, and crystallinity are systematically investigated. Upon being F4-TCNQ by the sequential doping method, PIDF-BT exhibited high electrical conductivity over 210 S cm-1. The significant enhancement resulted from which is attributed to effective charge-transfer-based integer between dopant molecules. Based on systemic characterization optical,...
Abstract Organic photodetectors (OPDs) based on non‐fullerene acceptors (NFAs) have received considerable attention because of their potential for use in various commercial applications as near‐infrared (NIR) light sensing platforms. However, recent OPDs suffer from low NIR photoresponse and large dark/noise currents with narrow bandgap organic photoactive materials. Herein, a π ‐bridge molecular engineering strategy replacing alkoxythienyl benzothiadiazole ultra‐narrow (ultra‐NBG) NFAs is...
Submillimeter sized n-channel organic single crystalline nanosheet based on dicyanodistyrylbenzene derivative, (2E,2′E)-3,3′-(2,5-dimethoxy-1,4-phenylene)bis(2-(5-(4-(trifluoromethyl)phenyl)thiophen-2-yl)acrylonitrile) (Me-4-TFPTA), is developed. Strong π–π interaction, hydrogen bonding interactions derived from cyano group (CN) as well solvent inclusion along the lateral direction play a key role in forming morphology. Me-4-TFPTA nanosheets exhibit excellent field-effect electron mobility...
Abstract We report on a molecularly tailored 1:1 donor–acceptor (D‐A) charge‐transfer (CT) cocrystal that manifests strongly red‐shifted CT luminescence characteristics, as well noteworthy reconfigurable self‐assembling behaviors. A loosely packed molecular organization is obtained consequence of the noncentrosymmetric chemical structure molecule A1 , which gives rise to considerable free volume and weak intermolecular interactions. The stacking features complex result in an external...