A5076701832- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Perovskite Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Thin-Film Transistor Technologies
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Quantum Dots Synthesis And Properties
- Nanomaterials and Printing Technologies
- Synthesis and properties of polymers
- ZnO doping and properties
- Advanced Fiber Optic Sensors
- Nonlinear Optical Materials Research
- Silicon and Solar Cell Technologies
- Luminescence and Fluorescent Materials
- Molecular Junctions and Nanostructures
- Supercapacitor Materials and Fabrication
- Chalcogenide Semiconductor Thin Films
- Nanowire Synthesis and Applications
- Solid-state spectroscopy and crystallography
- Nanofabrication and Lithography Techniques
- Semiconductor materials and devices
- Semiconductor materials and interfaces
- solar cell performance optimization
Jeonbuk National University
2015-2024
Kyushu University
2002-2024
Hyundai Steel (South Korea)
2022
Naver (South Korea)
2021
Chonbuk National University Hospital
2014-2020
Government of the Republic of Korea
2017-2020
Jeonju University
2016-2020
Fusion Academy
2016-2018
Fusion (United States)
2016-2018
Ewha Womans University
2015
Abstract Highly efficient and bendable organic solar cells (OSCs) are fabricated using solution‐processed silver nanowire (Ag NW) electrodes. The Ag NW films were highly transparent (diffusive transmittance ≈ 95% at a wavelength of 550 nm), conductive (sheet resistance 10 Ω sq −1 ), flexible (change in 1.1 ± 1% bending radius ≈200 μm). Power conversion efficiencies ≈5.80 5.02% obtained for devices on NWs/glass NWs/poly(ethylene terephthalate) (PET), respectively. Moreover, the NWs/PET...
A series of molecular engineered organic glasses have been prepared to exploit the use complementary Ar−ArF interactions improve poling efficiency. These self-organized also used as host in binary chromophore system further number density chromophores and r33 values. Ultrahigh values (up 327 pm/V at wavelength 1310 nm) good temporal stability could be achieved these materials.
Abstract Transparent electrodes have been widely used in electronic devices such as solar cells, displays and touch screens. Highly flexible transparent are especially desired for the development of next generation devices. Although indium tin oxide (ITO) is most commonly material fabrication electrodes, its brittleness growing cost limit utility Therefore, need new conductive materials with superior mechanical properties clear urgent. Ag nanowire (AgNW) has attracting increasing attention...
The authors demonstrate that the reduction of quantum efficiency with increasing current density in phosphorescent light emitting diodes (PhOLEDs) is related to formation excitons hole transporting layer based on analysis emission spectra and exciton zone. Low roll-off a PhOLED was achieved using dual layers (D-EMLs) by confining near interface between layers. external maintained almost constant up 22mA∕cm2 (10000cd∕m2) adopting D-EMLs Ir(ppy)3 PhOLEDs, resulting high (ηext=13.1%) at luminance.
An effective method for depositing highly transparent and conductive ultrathin silver (Ag) electrodes using minimal oxidation is reported. The of Ag layers significantly improves the intrinsic optical structural properties without any degradation its electrical conductivity. Oxygen‐doped (AgO x ) thicknesses as low 6 nm exhibit completely 2D continuous morphologies on ZnO films, smaller reflections absorbances, sheet resistances compared with those discontinuous granular‐type same thickness....
Abstract Highly efficient deep‐blue fluorescent materials based on phenylquinoline–carbazole derivatives (PhQ‐CVz, MeO‐PhQ‐CVz, and CN‐PhQ‐CVz) are synthesized for organic light‐emitting diodes (OLEDs). The form high‐quality amorphous thin films by thermal evaporation the energy levels can be easily adjusted introduction of different electron‐donating electron‐withdrawing groups carbazoylphenylquinoline. Non‐doped OLEDs that use PhQ‐CVz as emitter show bright emission (Commission...
By inserting a very thin layer of Ag between two layers amorphous indium zinc tin oxide (IZTO), we fabricated highly flexible, low resistance, and transparent IZTO-Ag-IZTO multilayer electrode on polyethylene terephthalate (PET) substrate. Due to surface plasmon resonance (SPR) effects the ductility layer, exhibited sheet resistance 4.99Ω∕sq. high transparency 86% as well superior flexibility despite thickness IZTO (30nm). It was found that transition from distinct islands continuous film...
White OLEDs with high efficiency and color stability are developed by using energy level dopants. The white showed external quantum of 11.7% remarkable the variation CIE chromaticity coordinates less than (0.02, 0.01) between 10 cd m−2 5000 m−2. Moreover roll-off was low CRI value over 87. Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2089/2008/adma200702435_s.pdf or from author. Please note: publisher not responsible content...
Extensive experimental and theoretical study suggests that interchromophore electrostatic interactions are among the most severe impediments to induction stability of large electro-optic coefficients in electric-field-poled organic materials. In this report, multichromophore-containing dendritic materials have been investigated as a means minimize unwanted attenuation nonlinear optical (electro-optic) activity at high chromophore loading. The molecular architectures employed were designed...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTwo-Step "Seed-Mediated" Synthetic Approach to Colloidal Indium Phosphide Quantum Dots with High-Purity Photo- and ElectroluminescenceParthiban RamasamyParthiban RamasamyDepartment of Energy Science Engineering, DGIST, Daegu 42988, Republic KoreaMore by Parthiban Ramasamyhttp://orcid.org/0000-0001-5844-7196, Keum-Jin KoKeum-Jin KoDepartment Flexible Printable Electronics, Polymer Materials Fusion Research Center, Chonbuk National University,...
Extremely flexible transparent conducting electrodes are developed using a combination of metal‐embedding architecture into plastic substrate and ultrathin electrodes, which leads to highly (optical transmittance ≈93% at wavelength 550 nm), (sheet resistance ≈13 Ω □ −1 ), extremely (bending radius ≈ 200 μm) electrodes. The used fabricate organic solar cells light‐emitting diodes that exhibit performance similar or superior devices fabricated on glass substrates. Moreover, the do not show...
Abstract Improving the ohmic contact and interfacial morphology between an electron transport layer (ETL) perovskite film is key to boost efficiency of planar solar cells (PSCs). In current work, amorphous–crystalline heterophase tin oxide bilayer (Bi‐SnO 2 ) ETL prepared via a low‐temperature solution process. Compared with amorphous SnO sol–gel (SG‐SnO or crystalline nanoparticle (NP‐SnO counterparts, Bi‐SnO exhibits improved surface morphology, considerably fewer oxygen defects, better...
Herein, a novel strategy is presented for enhancing light absorption by incorporating gold nanostars (Au NSs) into both the active layer of organic solar cells (OSCs) and rear-contact hole transport perovskite (PSCs). We demonstrate that power conversion efficiencies OSCs PSCs with embedded Au NSs are improved 6 14%, respectively. find pegylated greatly dispersable in chlorobenzene solvent, which enabled complete blending layer. The plasmonic contributions accelerated charge transfer...
Abstract Solution‐processed triple‐cation perovskite solar cells (PSCs) rely on complex compositional engineering or delicate interfacial passivation to balance the trade‐off between cell efficiency and long‐term stability. Herein, facile fabrication of highly efficient, stable, hysteresis‐free tin oxide (SnO 2 )‐based PSCs is demonstrated with a champion 20.06% using green, halogen‐free antisolvent. The antisolvent, composed ethyl acetate (EA) solvent hexane (Hex) in different proportions,...
Boseop Kim, HyoungSeok Sang-Woo Lee, Gichang Donghyun Kwak, Jeon Dong Hyeon, Sunghyun Park, Sungju Seonhoon Dongpil Seo, Heungsub Minyoung Jeong, Sungjae Minsub Suk Hyun Ko, Seokhun Taeyong Jinuk Soyoung Kang, Na-Hyeon Ryu, Kang Min Yoo, Minsuk Chang, Soobin Suh, Sookyo In, Jinseong Kyungduk Hiun Jisu Yong Goo Yeo, Donghoon Ham, Dongju Young Jaewook Inho Jung-Woo Ha, Woomyoung Nako Sung. Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing. 2021.
The authors report a promising metal oxide-doped hole transporting layer (HTL) of rhenium oxide (ReO3)-doped N,N′-diphenyl-N,N′-bis (1,1′-biphenyl)-4,4′-diamine (NPB). tris(8-hydroxyquinoline) aluminum-based organic light-emitting diodes with ReO3-doped NPB HTL exhibit driving voltage 5.2–5.4V and power efficiency 2.2–2.3lm∕W at 20mA∕cm2, which is significantly improved compared to those (7.1V 2.0lm∕W, respectively) obtained from the devices undoped NPB. Furthermore, device reveals prolonged...
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTDiels−Alder "Click Chemistry" for Highly Efficient Electrooptic PolymersTae-Dong Kim, Jingdong Luo, Yanqing Tian, Jae-Won Ka, Neil M. Tucker, Marnie Haller, Jae-Wook Kang, and Alex K.-Y. JenView Author Information Department of Materials Science & Engineering Chemistry, University Washington, Seattle, Washington 98195 Cite this: Macromolecules 2006, 39, 5, 1676–1680Publication Date (Web):February 2,...
Iridium complexes containing cyclometalated 2-cyclohexenylpyridine derivatives with rigid and bulky cyclohexene units are synthesized, found to be highly efficient materials in EL devices (see figure). Devices based on these iridium emit yellowish- green light the very high external quantum efficiency of 18.7%.
We have synthesized a new class of highly efficient nonlinear optical (NLO) chromophores based on the novel tricyanopyrroline (TCP) electron acceptor. Molecular linear and properties prototypical were measured calculated to understand structure−property relationships. One such chromophore showed molecular first hyperpolarizability (β) (8700 ± 702) × 10-30 esu at excitation wavelengths 1.9 μm, another macroscopic electro-optic (EO) coefficients (r33) 51 pm/V 1.55 μm with 20 wt % loading when...