Search results for: Min Ju Cho

Items from 1 to 20 out of 76 results

article

Ultra‐Deep‐Blue Aggregation‐Induced Delayed Fluorescence Emitters: Achieving Nearly 16% EQE in Solution‐Processed Nondoped and Doped OLEDs with CIE_y < 0.1

Hyung Jong Kim, Hyunchul Kang, Ji‐Eun Jeong, Su Hong Park, more

Advanced Functional Materials > 31 > 33 > n/a - n/a

Ultra‐deep‐blue aggregation‐induced delayed fluorescence (AIDF) emitters (TB‐tCz and TB‐tPCz) bearing organoboron‐based cores as acceptors and 3,6‐substituted carbazoles as donors are presented. The thermally activated delayed fluorescence (TADF) properties of the two emitters are confirmed by theoretical calculations and time‐resolved photoluminescence experiments. TB‐tCz and TB‐tPCz exhibit fast...

article

Asymmetric Host Molecule Bearing Pyridine Core for Highly Efficient Blue Thermally Activated Delayed Fluorescence OLEDs

Jiwon Yoon, Seong Keun Kim, Hyung Jong Kim, Suna Choi, more

Chemistry – A European Journal > 26 > 69 > 16383 - 16391

In this study, two host materials, pCzBzbCz and pCzPybCz, are synthesized to achieve a high efficiency and long lifetime of blue thermally activated delayed fluorescence organic light‐emitting diodes (TADF‐OLEDs). The molecular design strategy involves the introduction of a pyridine group into the core structure of pCzPybCz as an electron‐withdrawing unit, and an electron‐donating phenyl group into...

article

Synthesis of Conjugated Wide-Bandgap Copolymers Bearing Ladder-Type Donating Units and Their Application to Non-Fullerene Polymer Solar Cells

Mai Ha Hoang, Gi Eun Park, Dinh Long Phan, Trinh Tung Ngo, more

Macromolecular Research > 2018 > 26 > 9 > 844-850

Two new wide-bandgap conjugated copolymers, T-3MT and 2T-3MT, containing methyl-3-thiophenecarboxylate (3MT) as a weak accepting unit and indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) as ladder-type donating units, were synthesized through Stille coupling polymerization. The effects of the IDT and IDTT units on the physical, optical, and electrochemical properties of these copolymers...

article

Novel wide-bandgap copolymer bearing alkylthio-thiophene-substituted benzodithiophene and methyl thiophene-3-carboxylate for highly stable fullerene-free simple polymer solar cells

Su Hong Park, Gi Eun Park, Suna Choi, Seo Yeon Park, more

Organic Electronics > 2018 > 53 > C > 151-159

We successfully synthesized a wide-bandgap p-type copolymer, 3MT-Th-S, bearing alkylthio-substituted benzodithiophene (BDT) as a donor and methyl-3-thiophenecarboxylate (3MT) as a weak electron acceptor. The electron affinity of the sulfur atom in the 2-ethylhexylthio side chains tethered to the thiophene units induces a low-lying highest occupied molecular orbital (HOMO) energy level in the corresponding...

article

Effect of acceptor strength in new acceptor–donor–acceptor-type molecules on their miscibility with donor polymers for bulk-heterojunction fullerene-free solar cells

Seo Yeon Park, Gi Eun Park, Suna Choi, Ji Hyung Lee, more

Dyes and Pigments > 2017 > 146 > C > 226-233

We designed and synthesized two kinds of spirobifluorene (SP)-based acceptor–donor–acceptor (A–D–A)-type acceptor materials, denoted by SP-IC and SP-TCF, which have an A–D–A structure consisting of a 3D tetrathienospirobifluorene donor core and 2-(3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (IC) or 2-(3-cyano-4,5,5-trimethylfuran-2(5H)-ylidene)malononitrile (TCF) acceptors as terminal units,...

article

Side-chain engineering of diketopyrrolopyrrole-based copolymer using alkyl ester group for efficient polymer solar cell

Jae Yoon Kim, Young Un Kim, Hyung Jong Kim, Hyun Ah Um, more

Macromolecular Research > 2016 > 24 > 11 > 980-985

The new diketopyrrolopyrrole-based copolymer, referred to as PDPPBDTE, bearing linear alkyl ester groups, was synthesized with the objective of improving the miscibility between the donor polymer and [6,6]-phenyl C₇₁ butyric acid methyl ester (PC₇₁BM). PDPPBDTA bearing ethylhexyl side-chains was also synthesized as a control polymer. The PDPPBDTE:PC₇₁BM blend film showed a relatively small crystalline...

article

Importance of varying electron-accepting moieties in regular conjugated terpolymers for use in polymer solar cells

Hyung Jong Kim, Gi Eun Park, Dae Hee Lee, Min Ju Cho, more

Organic Electronics > 2016 > 38 > C > 256-263

Three A₁-D-A₂-D regular conjugated terpolymers containing diketopyrrolopyrrole, isoindigo, or thienoisoindigo moieties were synthesized. Each terpolymer with the combination of two different acceptors and thiophene as common donor displayed strong absorption from 500 nm to the near-IR region as well as different molecular energy levels. Among three terpolymers, bulk heterojunction polymer solar cell...

article

Diketopyrrolopyrrole-based conjugated small molecules bearing two different acceptor moieties for organic solar cells

Eun Yi Ko, Suna Choi, Gi Eun Park, Dae Hee Lee, more

Synthetic Metals > 2016 > 221 > C > 39-47

Three A₁-D-A₂-D-A₁-type conjugated molecules (A: acceptor, D: donor), containing diketopyrrolopyrrole (DPP) acceptors, another weaker acceptor, and thiophenes as common donors, were synthesized. The molecules exhibited strong absorption from 500nm to the near-IR wavelength region, and different molecular energy levels. The three molecules synthesized were applied in solar cells made with phenyl-C₇₁...

article

Ternary polymer solar cell based on two donors and one acceptor for improving morphology and power conversion efficiency

Hyun Ah Um, Dae Hee Lee, Gi Eun Park, Min Ju Cho, more

Synthetic Metals > 2016 > 220 > C > 362-368

We synthesized isoindigo-based two donor-acceptor (D-A) copolymers to optimize the morphology in ternary blend films with two p-type polymers and n-type phenyl-C61-butyric acid methyl ester (PC₆₁BM). Compared to binary systems with a single copolymer and PC₆₁BM, the ternary polymer solar cell with two copolymers and PC₆₁BM showed highly enhanced power conversion efficiency of 5.13% with a high short...

article

Isoindigo-based polymer solar cells with high open circuit voltages up to 1.01 V

Gi Eun Park, Suna Choi, Jicheol Shin, Min Ju Cho, more

Organic Electronics > 2016 > 34 > C > 157-163

Isoindigo-based copolymers containing non-fluorinated (PIIDBT) and fluorinated bithiophene moieties (PIIDFBT) were synthesized. The replacement of hydrogen atoms with electronegative fluorine atom attained the intramolecular noncovalent interactions in conjugated polymer structure employing the concept of conformational locks. Furthermore, the fluorine characteristics as substituent atoms tuned the...

article

Effect of the thiophene and selenophene moiety in regular terpolymers on the performance of thin film transistors and polymer solar cells

Ji Hyung Lee, Gi Eun Park, Suna Choi, Dae Hee Lee, more

Polymer > 2016 > 94 > C > 43-52

We demonstrated the effective structural control of the conjugation length and various donor moieties using thiophene and selenophene derivatives in a regular terpolymer system and compared the properties with two copolymers of PDPP-SS and PDPP-TT. The three different terpolymers are composed of diketopyrrolopyrrole (DPP)-based polymers such as PDPP-TTS, PDPP-TSS, and PDPP-TTSS. The optical and electronic...

article

A diketopyrrolopyrrole-based regular terpolymer bearing two different π-extended donor units and its application in solar cells

Sang Beom Kim, Hyun Ah Um, Hyung Jong Kim, Min Ju Cho, more

Organic Electronics > 2016 > 31 > C > 198-206

In this study, to adjust the desired molecular energy levels and bandgap energies of polymers for photovoltaic applications, a regular terpolymer structure was designed. A new regular terpolymer, poly(DPP4T-alt-TBP), containing diketopyrrolopyrrole (DPP), BT, and BP units in the repeating group was successfully synthesized. The DPP-BT monomeric unit in polymer backbone enhanced chain packing and induced...

article

Regular conjugated terpolymers comprising two different acceptors and bithiophene donor in repeating group: Effect of strong and weak acceptors on semiconducting properties

Mai Ha Hoang, Jong‐Soo Ahn, Duc Nghia Nguyen, Trinh Tung Ngo, more

Journal of Polymer Science Part A: Polymer Chemistry > 54 > 10 > 1339 - 1347

Diketopyrrolopyrrole (DPP)‐based terpolymers—P(DPP‐TPyT) and P(DPP‐T3MTT)—bearing bithiophene donating groups and weak accepting units such as pyridine (Py) or methyl thiophene‐3‐carboxylate (3MT), in the polymer backbone, were successfully synthesized. Although the two polymers had similar physical and electrochemical properties, grazing incidence X‐ray diffraction patterns of P(DPP‐TPyT) and P(DPP‐T3MTT)...

article

New π‐Conjugated polymers containing 4H,4′H‐[1,1′‐Bithieno [3,4‐C]Pyrrole]‐4,4′,6,6′(5H,5′H)‐Tetraone (biTPD) units and their application to thin‐Film transistors and photovoltaic cells

Dae Hee Lee, Kyung Hwan Kim, Jicheol Shin, Min Ju Cho, more

Journal of Polymer Science Part A: Polymer Chemistry > 54 > 9 > 1228 - 1235

We successfully synthesized new D‐A copolymers that employ 1,10‐bithienopyrrolodione (biTPD), thiophene, and selenophene‐based donor monomeric units. Two polymers, PBTPDEBT and PBTPDEBS, exhibited high degrees of crystallinity and unique polymer chain arrangements on the substrate, which is attributed to their enhanced coplanarity and intermolecular interactions between the polymer chains. Among the...

article

Dithienothiophene–diketopyrrolopyrrole-containing copolymers with alkyl side-chain and their application to polymer solar cells

Suna Choi, Gi Eun Park, Jicheol Shin, Hyun Ah Um, more

Synthetic Metals > 2016 > 212 > C > 167-173

We synthesized a series of dithieno[3,2-b:2′,3′-d]thiophene and diketopyrrolopyrrole (DPP) based alternating copolymers, PDTTDPPs, with one of three branched alkyl side-chains (2-ethylhexyl, 2-butyloctyl, or 2-decyltetradecyl chains) tethered to the DPP moiety. These branched alkyl side-chains of various sizes were anchored to the DPP moiety owing to the relatively facile synthesis of DPP-based building...

article

A phenothiazine-based “naked-eye” fluorescent probe for the dual detection of Hg2+ and Cu2+: Application as a solid state sensor

Matinder Kaur, Min Ju Cho, Dong Hoon Choi

Dyes and Pigments > 2016 > 125 > C > 1-7

A phenothiazine-based colorimetric and fluorescent probe (3) for Hg²⁺ and Cu²⁺ was designed and synthesized. Probe 3 showed high selectivity and sensitivity toward Hg²⁺ and Cu²⁺ over other metal ions. This probe works as a chemodosimeter based on the Kucherov reaction for the selective detection of Hg²⁺. Copper recognition is based on soft–soft metal interactions with the –S and –N atoms of the probe...

article

Molecular-weight engineering of high-performing diketopyrrolopyrrole-based copolymer bearing high π-extended long donating units

Mai Ha Hoang, Duc Nghia Nguyen, Trinh Tung Ngo, Hyun Ah Um, more

Polymer > 2016 > 83 > C > 77-84

Two D–A alternating π-conjugated copolymers bearing diketopyrrolopyrrole (DPP) and sextetthiophene with different molecular weights were synthesized to investigate their physical properties and performance in thin-film transistors and photovoltaic cells. The solubility and molecular weight (MW) of these copolymers with a highly rigid backbone were improved by controlling the feeding ratio of the monomer...

article

Diketopyrrolopyrrole-tellurophene polymer for fast, selective, and reversible detection of bromine in solution, vapor, and solid states: A systematic study

Matinder Kaur, Dae Hee Lee, Da Seul Yang, Hyun Ah Um, more

Dyes and Pigments > 2015 > 123 > C > 317-322

Conjugated polymers are of great interest and have been extensively examined as colorimetric and fluorometric sensors for biologically important species. Here, we report the systematic investigation of diketopyrrolopyrrole based conjugated polymers (PDTDPPT, PDTDPPSe and PDTDPPTe) bearing S, Se, and Te towards oxidative addition of Br₂ using absorption spectroscopy, NMR spectroscopy, cyclic voltammetry,...

article

New π-extended triphenylene-based organic semiconductors in field-effect transistors

Mai Ha Hoang, Duc Nghia Nguyen, Trinh Tung Ngo, Min Ju Cho, more

Synthetic Metals > 2015 > 209 > C > 434-440

We demonstrated the synthesis of two new solution-processed triphenylene-based semiconductors and characterized their physical, optical, and electrochemical properties. Both were intriguingly capable of producing smooth films and high-quality microcrystalline objects. The single-crystal-based field-effect transistors (FETs) using these semiconductors displayed a maximum carrier mobility of ∼0.03cm...

article

Molecular design of large-bandgap host materials and their application to blue phosphorescent organic light-emitting diodes

Ju Sik Kang, Tae Ryang Hong, Hyung Jong Kim, Young Hoon Son, more

Organic Electronics > 2015 > 26 > C > 218-224

New large-bandgap host materials with carbazole and carboline moieties were designed and synthesized for high-performance blue phosphorescent organic light-emitting diodes (PhOLEDs). The two kinds of host materials, 9-(4-(9H-carbazol-9-yl)phenyl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (pP2CZCB) and 9-(3-(9H-carbazol-9-yl)phenyl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (mP2CZCB), displayed...

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DIKETOPYRROLOPYRROLE (12)
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CARBAZOLE (4)
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PCBM (4)
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THIN FILM TRANSISTOR (4)
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INFONA - science communication portal

Search results for: Min Ju Cho

Ultra‐Deep‐Blue Aggregation‐Induced Delayed Fluorescence Emitters: Achieving Nearly 16% EQE in Solution‐Processed Nondoped and Doped OLEDs with CIE_y < 0.1

Asymmetric Host Molecule Bearing Pyridine Core for Highly Efficient Blue Thermally Activated Delayed Fluorescence OLEDs

Synthesis of Conjugated Wide-Bandgap Copolymers Bearing Ladder-Type Donating Units and Their Application to Non-Fullerene Polymer Solar Cells

Novel wide-bandgap copolymer bearing alkylthio-thiophene-substituted benzodithiophene and methyl thiophene-3-carboxylate for highly stable fullerene-free simple polymer solar cells

Effect of acceptor strength in new acceptor–donor–acceptor-type molecules on their miscibility with donor polymers for bulk-heterojunction fullerene-free solar cells

Side-chain engineering of diketopyrrolopyrrole-based copolymer using alkyl ester group for efficient polymer solar cell

Importance of varying electron-accepting moieties in regular conjugated terpolymers for use in polymer solar cells

Diketopyrrolopyrrole-based conjugated small molecules bearing two different acceptor moieties for organic solar cells

Ternary polymer solar cell based on two donors and one acceptor for improving morphology and power conversion efficiency

Isoindigo-based polymer solar cells with high open circuit voltages up to 1.01 V

Effect of the thiophene and selenophene moiety in regular terpolymers on the performance of thin film transistors and polymer solar cells

A diketopyrrolopyrrole-based regular terpolymer bearing two different π-extended donor units and its application in solar cells

Regular conjugated terpolymers comprising two different acceptors and bithiophene donor in repeating group: Effect of strong and weak acceptors on semiconducting properties

New π‐Conjugated polymers containing 4H,4′H‐[1,1′‐Bithieno [3,4‐C]Pyrrole]‐4,4′,6,6′(5H,5′H)‐Tetraone (biTPD) units and their application to thin‐Film transistors and photovoltaic cells

Dithienothiophene–diketopyrrolopyrrole-containing copolymers with alkyl side-chain and their application to polymer solar cells

A phenothiazine-based “naked-eye” fluorescent probe for the dual detection of Hg2+ and Cu2+: Application as a solid state sensor

Molecular-weight engineering of high-performing diketopyrrolopyrrole-based copolymer bearing high π-extended long donating units

Diketopyrrolopyrrole-tellurophene polymer for fast, selective, and reversible detection of bromine in solution, vapor, and solid states: A systematic study

New π-extended triphenylene-based organic semiconductors in field-effect transistors

Molecular design of large-bandgap host materials and their application to blue phosphorescent organic light-emitting diodes

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