A5035298062- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Perovskite Materials and Applications
- Thin-Film Transistor Technologies
- Liquid Crystal Research Advancements
- Molecular Junctions and Nanostructures
- Nonlinear Optical Materials Research
- Advanced Memory and Neural Computing
- Photochromic and Fluorescence Chemistry
- Molecular Sensors and Ion Detection
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Advanced Sensor and Energy Harvesting Materials
- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Green IT and Sustainability
- Nonlinear Optical Materials Studies
- Porphyrin and Phthalocyanine Chemistry
- Synthesis and properties of polymers
- Photoreceptor and optogenetics research
- Nanomaterials and Printing Technologies
Korea University
2016-2025
Asan Medical Center
2023
University of Ulsan
2023
Ulsan College
2023
Government of the Republic of Korea
2015-2021
Seoul Institute
2015-2020
University of Siegen
2019
University at Buffalo, State University of New York
2011-2016
Korea Basic Science Institute
2013
Korea Institute of Science and Technology
2006
Thermally activated delayed fluorescence materials exhibited outstanding external quantum efficiencies in OLEDs along with good CIE color coordinates and improved device stabilities. Hence these are most promising for commercialization of OLEDs.
Despite the high performance of OLEDs consisting host–guest blend systems in emissive layer, containing a single molecule as an emitter layer (<italic>i.e.</italic> non-doped OLEDs) have significant advantages including easy fabrication procedures and enhanced device stability.
A facile approach to make an efficient hybrid bulk heterojunction photovoltaic device with lead sulfide nanocrystals and a low-bandgap polymer is demonstarted, resulting in power conversion efficiency of about 2–3%.
Anthracene-based conjugated molecules are synthesized and J-aggregations clearly observed in a single-crystal structure study. Single-crystal-based field-effect transistors (FETs) exhibit high mobility. They displayed dramatic photoinduced enhancement of the drain current showed unusually photoresponsivity under extremely low intensity light. Due to excitons, single multiple-stage memory operations achieved.
Abstract Ultra‐deep‐blue aggregation‐induced delayed fluorescence (AIDF) emitters (TB‐tCz and TB‐tPCz) bearing organoboron‐based cores as acceptors 3,6‐substituted carbazoles donors are presented. The thermally activated (TADF) properties of the two confirmed by theoretical calculations time‐resolved photoluminescence experiments. TB‐tCz TB‐tPCz exhibit fast reverse intersystem crossing rate constants owing to efficient spin–orbit coupling between singlet triplet states. When applied in...
Abstract Three new color‐tunable (deep‐blue to sky‐blue) and solution‐processable emitters—9′‐(2,12‐di‐ tert ‐butyl‐5,9‐dioxa‐13 b ‐boranaphtho[3,2,1‐ de ]anthracen‐7‐yl)‐9′ H ‐9,3′:6′,9″‐tercarbazole ( TB‐3Cz) , 9′‐(2,12‐di‐ ]anthracen‐7‐yl)‐9,9″‐diphenyl‐9 ,9′ ,9″ ‐3,3′:6′,3″‐tercarbazole TB‐P3Cz) 9‐(2,12‐di‐ ]anthracen‐7‐yl)‐ N 3 6 ‐tetraphenyl‐9 ‐carbazole‐3,6‐diamine TB‐DACz) —are demonstrated, which are cleverly designed synthesized by appending a boron‐fused entity as an electron...
Recently, all-polymer solar cells (all-PSCs) have made significant progress in terms of efficiency and performance. Using Y-series-based small-molecule acceptors, a new range polymer acceptors for all-PSC has been developed. These synthesized low band gap, broad absorption, easily tunable energy levels, making them suitable n-type candidates efficient all-PSCs. In this review, we summarize some molecular design synthesis strategies used to advance the field innovative materials device...
We synthesized a highly crystalline DPP-based polymer, DPPBTSPE, which contained 1,2-bis(5-(thiophen-2-yl)selenophen-2-yl)ethene as planar and rigid electron donating group. High- low-molecular weight (MW) DPPBTSPE fractions were collected by Soxhlet extraction employed to investigate their unique charge transport properties in macroscopic films single polymer nanowire (SC-PNW), respectively. The low-MW could provide well-isolated high aspect ratio SC-PNWs, the direction of π–π stacking was...
A new tellurophene-based π-conjugated polymer, PDTDPPTe, was synthesized. PDTDPPTe exhibits a smaller optical band gap (Egopt = 1.25 eV) than thiophene-based PDTDPPT 1.30 eV). Thin-film transistors comprising displayed outstanding performance (μmax 1.78 cm2 V−1 s−1, Ion/Ioff 105–6).
A new solution-processable polymeric emitter containing non-conjugated cyclohexane units was developed for high-performing TADF-OLEDs.
2CzPN-based blue TADF-OLED devices with a ZDN host showed remarkably high external quantum efficiency of 25.7%.
Template-guided solution-shearing (TGSS) is used to fabricate field-effect transistors (FETs) composed of micropatterned prisms as active channels. The comprise highly crystalline PTDPP-DTTE, in which diketopyrrolopyrrole (DPP) flanked by thiophene. FET has a maximum mobility approximately 7.43 cm2 V−1 s−1, much higher than the values thin-film with solution-sheared or spin-coated films PTDPP-DTTE annealed at 200 °C. As service our authors and readers, this journal provides supporting...
We synthesized a novel fully conjugated block copolymer, P3, in which wide-band gap donor (P1) was connected to narrow-band acceptor (P2). As P3 contains P1 with wide bandgap and P2 narrow bandgap, it exhibits very complementary absorption. Transient photoluminescence measurement using dilute solution demonstrated intramolecular charge transfer between the block, not observed P1/P2 blend solution. A thin film showed complete PL quenching because photoinduced inter-/intramolecular states were...
A highly crystalline conjugated donor (D)-acceptor (A) block copolymer (PBDT2T-b-N2200) that has good solubility in nonhalogenated solvents is successfully synthesized. PBDT2T-b-N2200 shows a broad complementary absorption behavior owing to wide-band gap (PBDT2T) present as D-block and narrow-band acceptor (N2200) an A-block. Polymer solar cells (PSCs) with (CBCP) are fabricated using toluene solution PSC created annealed film showing the highest power conversion efficiency of 6.43%, which...
Herein, a novel core molecule for V-shaped host molecules was synthesized, wherein two carbazoles were directly linked to cyclohexane. Cy-mCP and Cy-mCBP hosts also successfully prepared solution-processable thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). The contained cyclohexane linker small molecular (mCP mCBP), exhibiting twice the weight while maintaining basic properties of single with improved film-forming ability solubility in solvents. These...
New isoindigo and di(thienyl)ethylene-containing π-extended conjugated polymers with different branched side-chains molecular weights (MWs) have been synthesized. Octyldodecyl (OD) decyltetradecyl (DT) groups were employed as side chain moieties tethered to units. In addition, the MW of polymer was varied by changing polymerization time. The bearing DT chains showed much better charge transport behavior, compared that OD chains. hole mobility high-MW PIIDDTE-III determined be higher than...
In this work, three-armed luminogens IAcTr-out and IAcTr-in were synthesized used as emitters bearing triazine indenoacridine moieties in thermally activated delayed fluorescence organic light-emitting diodes (OLEDs). These molecules could form a uniform thin film via the solution process also allowed subsequent deposition of an electron transporting layer either by vacuum or all-solution coating method. Intriguingly, new displayed aggregation-induced emission (AIE), which is unique...
New thienothiophene-flanked diketopyrrolopyrrole and thiophene-containing π-extended conjugated polymers with various branched alkyl side-chains were successfully synthesized. 2-Octyldodecyl, 2-decyltetradecyl, 2-tetradecylhexadecyl, 2-hexadecyloctadecyl, 2-octadecyldocosyl groups selected as the side-chain moieties anchored to N-positions of unit. All five found be soluble owing bulkiness side chains. The thin-film transistor based on 2-tetradecylhexadecyl-substituted polymer showed highest...
A single component polymer solar cell with a CDABP film annealed at 180 °C showed maximum power conversion efficiency of 5.28%, which is much higher than that (2.62%) the device as-cast film.
New M- and V-shaped perylene diimide (PDI)-based small molecules were synthesized as new n-type acceptors for nonfullerene-based polymer solar cells.
New small molecules having modified acceptor strength and π-conjugation length containing dicyanovinylene (DCV) tricyanovinylene (TCV) as a strongly electron-accepting unit with indacenodithiophene, IDT(DCV)2, IDT(TCV)2, IDTT(TCV)2, were synthesized studied in terms of their applicability to polymer solar cells PTB7-Th an electron-donating polymer. Intriguingly, the blended films IDT(TCV)2 IDTT(TCV)2 exhibited superior shelf life stabilities more than 1000 h without any reduction initial...