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최적화된 전자 수송층을 활용한 완전한 용액공정 기반 녹색 유기발광다이오드
한주원,김용현,Han, Joo Won,Kim, Yong Hyun 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.7
Solution-processed organic light-emitting diodes (OLEDs) have the advantages of low cost, fast fabrication, and large-area devices. However, most studies on solution-processed OLEDs have mainly focused on solution-processable hole transporting materials or emissive materials. Here, we report fully solution-processed green OLEDs including hole/electron transport layers and emissive layers. The electrical and optical properties of OLEDs based on solution-processed TPBi (2,2',2"-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole)) as the electron transport layer were investigated with respect to the spin speed and the number of layers. The performance of OLEDs with solution-processed TPBi exhibits a power efficiency of 9.4 lm/W. We believe that the solution-processed electron transport layers can contribute to the development of efficient fully solution-processed multilayered OLEDs.
거습복합방(祛濕複合方)이 류마토이드 관절염에 미치는 영향
한주원 ( Joo Won Han ),송영일 ( Young Il Song ),윤일지 ( Il Ji Yoon ),오민석 ( Min Suck Oh ) 한방재활의학과학회 2006 한방재활의학과학회지 Vol.16 No.3
Objectives : This study was carried out to know the inhibitory effect of Kuseupbokhap-bang(Qush.fuhe-f.ng; KC) on rheumatoid arthritis in human fibroblast-like synoviocytes(hFLSs). Methods : For this purpose, experiments were performed to measure the cytotoxicity against hFCs and the production of pro-inflammatory cytokines in hFLSs and the production of NO, ROS. Results : KC had no cytotoxicity against hFCs and reduced the production of pro-inflammatory cytokines TNF-α, IL-6, IL-8, IL-1β in hFLSs, increased the production of TIMP-1. As well as KC reduced the production of MMP-3, NOS-II, ICAM-1, the production of Nitric oxide and ROS, and the proliferation of hFLSs in proportion to the concentration of KC significantly. Conclusions : Comparison of the results for this study showed that KC had immunomodulatory effects of suppressing or enhancing.
유기발광다이오드를 위한 SiO<sub>2</sub> 나노파티클-전도성 고분자 기반의 내부 광추출 구조 개발
한주원 ( Joo Won Han ),김진희 ( Jin Hee Kim ),김용현 ( Yong Hyun Kim ),윤창훈 ( Changhun Yun ) 한국화상학회 2017 한국화상학회지 Vol.23 No.4
In this work, we fabricate light extraction structures based on solution-processed SiO<sub>2</sub> nanoparticles-conducting polymer PEDOT:PSS composites for organic light-emitting diodes (OLEDs). The effects of various concentration of SiO<sub>2</sub> nanoparticles and the introduction of upper/bottom buffer layers on the morphology of light extraction structures are investigated.
ZnO 나노파티클-투명 고분자 복합 구조 기반의 OLED용 내부 광추출 구조의 개발
한주원 ( Joo Won Han ),김동우 ( Dong Woo Kim ),임권택 ( Kwon Taek Lim ),김용현 ( Yong Hyun Kim ) 한국화상학회 2015 한국화상학회지 Vol.21 No.4
Organic light-emitting diodes (OLEDs) have attracted much attention as future lighting sources and they have already found application in commercial display devices. However, the external quantum efficiency of conventional OLEDs is still limited to 20~ 30% because of the total internal reflection in the organic layers/transparent electrodes and the substrate. Therefore, the development of the efficient light extraction system is required to realize high efficiency OLEDs. For utilizing the internal light extraction system in devices, the surface roughness of extraction systems should be low enough to prevent leakage current of devices. In this study, we demonstrate an internal light extraction system based on ZnO nanoparticles-transparent polymer composites by a simple and easy manufacturing process. We investigate the effect of nanoparticle dispersion on the optical property, surface morphology of light scattering films.
PEDOT:PSS의 두께가 유무기 하이브리드 태양전지 성능에 미치는 영향
김석윤(Souk Yoon Kim),한주원(Joo Won Han),오준호(Joon-Ho Oh),김용현(Yong Hyun Kim) 한국태양광발전학회 2019 Current Photovoltaic Research Vol.7 No.3
In this study, we investigate organic-inorganic hybrid solar cells with a very simple three-layer structure (Al/n-Si/PEDOT:PSS). The performance of hybrid solar cells is optimized by controlling the sheet resistance and optical transmittance of the PEDOT:PSS layers. As the thickness of the PEDOT:PSS layer decreases, the optical absorption of the n-Si increases, which greatly improves the short-circuit current density (JSC) of devices, but the increase in sheet resistance leads to a decrease in the open-circuit voltage (VOC) and the fill factor (FF). The solar cell with the 180-nm thick PEDOT:PSS layer shows a highest efficiency of 8.45% (VOC: 0.435 V, JSC: 33.7 mA/cm², FF: 57.5%). Considering these results, it is expected that the optimizing process for the sheet resistance and transmittance of the PEDOT:PSS layer is essential for producing high-efficiency organic-inorganic hybrid solar cells and will serve as an important basis for achieving low-cost, high-efficiency solar cells.
솔벤트 도핑과 후처리 공정에 따른 전도성 고분자 PEDOT : PSS의 특성 변화
김진희 ( Jin Hee Kim ),서윤경 ( Yoon Kyung Seo ),한주원 ( Joo Won Han ),오지윤 ( Ji Yoon Oh ),김용현 ( Yong Hyun Kim ) 한국공업화학회 2015 공업화학 Vol.26 No.3
Poly(3,4-ethylenedioxythiophene) : poly(styrenesulfonate) (PEDOT : PSS) has attracted a great deal of attention as a transparent conductive material for organic solar cells or organic light-emitting diodes due to its high electrical conductivity, optical transparency, and excellent mechanical flexibility. It is well known that a solvent doping for PEDOT : PSS thin-films significantly increases the conductivity of films. In this paper, the effect of various kinds of solvent doping and post-treatment on the electrical and structural properties of PEDOT : PSS thin-films is investigated. The solvent doping greatly increases the conductivity of PEDOT : PSS thin-films up to 884 S/cm. A further enhancement of the conductivity of PEDOT : PSS thin-films is achieved by the solvent post-treatment which raises the conductivity up to 1131 S/cm. The enhancement is mainly caused by the depletion of insulating PSS and forming conducting PEDOT-rich granular networks. Strong optical absorption peaks at the wavelength of 225 nm of PEDOT : PSS thin-films indicate the depletion of insulating PSS by post-treatment. We believe that the solvent post-treatment is a promising method to achieve highly conductive transparent PEDOT : PSS thin-films for applications in efficient, low-cost and flexible organic devices.