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Current applied physics : the official journal of ... 22건

  1. [국내논문]   Editorial board  


    Current applied physics : the official journal of the Korean Physical Society v.5 no.4 ,pp. CO2 - CO2 , 2005 , 1567-1739 ,

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  2. [국내논문]   The electrical characteristics of pentacene-based organic field-effect transistors with polymer gate insulators  

    Kang, G.-W. (Department of Physics, Inha University, Incheon 402-751, South Korea ) , Park, K.-M. (Department of Physics, Inha University, Incheon 402-751, South Korea ) , Song, J.-H. (Department of Physics, Inha University, Incheon 402-751, South Korea ) , Lee, C.H. (Department of Physics, Inha University, Incheon 402-751, South Korea ) , Hwang, D.H. (Department of Applied Chemistry, Kumoh National Institute of Technology, Kumi 730-701, South Korea)
    Current applied physics : the official journal of the Korean Physical Society v.5 no.4 ,pp. 297 - 301 , 2005 , 1567-1739 ,

    초록

    Abstract We have studied the electrical characteristics of pentacene field-effect transistors with the polymer insulators such as polymethyl methacrylate (PMMA) or poly-4-vinylphenol (PVP). The dependence of the field-effect mobility on the electric field and the temperature were measured to understand the conduction mechanism in the pentacene thin film. The transistor with PVP gate insulator shows higher field-effect mobility, μ FET =0. 0.15 cm 2 /Vs, and smaller threshold voltage, V T = 1.9 V, compared with the transistor with PMMA. The higher mobility of pentacene on PVP is attributed to the larger grain size, as observed by the atomic force microscope (AFM) images. The transistor with the PVP gate insulator shows less field dependence, implying less trap concentrations. In addition, it shows a thermally activated behavior with an activation energy of about 49 meV at high temperature and temperature independence at the low temperature, implying that the conduction process is governed by hopping mechanism at high temperature, while it is predominantly limited by a tunneling process through the grain boundaries.

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  3. [국내논문]   Electrical properties of multi-walled carbon nanotube/poly(methyl methacrylate) nanocomposite  

    Park, S.J. (Department of Polymer Science and Engineering, Inha University, Incheon 402-751, South Korea ) , Lim, S.T. (Department of Polymer Science and Engineering, Inha University, Incheon 402-751, South Korea ) , Cho, M.S. (Department of Polymer Science and Engineering, Inha University, Incheon 402-751, South Korea ) , Kim, H.M. (Department of Physics, Korea University, Seoul 136-701, South Korea ) , Joo, J. (Department of Physics, Korea University, Seoul 136-701, South Korea ) , Choi, H.J. (Department of Polymer Science and Engineering, Inha University, Incheon 402-751, South Korea)
    Current applied physics : the official journal of the Korean Physical Society v.5 no.4 ,pp. 302 - 304 , 2005 , 1567-1739 ,

    초록

    Abstract Multi-walled carbon nanotube (MWNT) nanocomposites with poly(methyl methacrylate) were prepared via both an in situ bulk polymerization and a suspension polymerization using a radical initiator of 2,2-azobisisobutyronitrile (AIBN). Prior to the synthesis, the MWNT was purified in an acidic solution to remove impurities such as metallic catalysts and amorphous carbons. The AIBN induced PMMA was grafted on the MWNT, which was confirmed by a Fourier transform infrared spectrometer (FT-IR). The composite morphology of the MWNT was observed by scanning electron microscopy (SEM). Electrical characteristics were further examined via both a four-probe method and a rotational rheometer equipped with a high voltage generator.

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  4. [국내논문]   Organic electrophosphorescent devices with mixed hole transport material as emission layer  

    Matsushima, Hidenobu (Department of Electric and Electronic Engineering, Toyama University, Toyama 930-8555, Japan ) , Naka, Shigeki (Corresponding author ) , Okada, Hiroyuki (Department of Electric and Electronic Engineering, Toyama University, Toyama 930-8555, Japan ) , Onnagawa, Hiroyoshi (Department of Electric and Electronic Engineering, Toyama University, Toyama 930-8555, Japan)
    Current applied physics : the official journal of the Korean Physical Society v.5 no.4 ,pp. 305 - 308 , 2005 , 1567-1739 ,

    초록

    Abstract We report on the reduction of driving voltage in organic electrophosphorescent devices with mixed hole transport material as emission layer. The emission layer was mixed with N , N ′ -diphenyl- N , N ′ -(3-methylphenyl) -[1,1 ′ -biphenyl]-4,4 ′ -diamine (TPD) as a hole-transport material, 4,4 ′ -bis(9-carbazolyl)-biphenyl (CBP) as a host material for a phosphorescent material, tris(2-phenylpyridine) iridium (Ir(ppy) 3 ) as a phosphorescent material and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (bathocuproine: BCP) as an electron-transport material. The emission occurred from Ir(ppy) 3 and was independent on the ratio of TPD and CBP. For triple-layered device with the TPD:CBP mixing ratio of 10:90, maximum luminance obtained was 104,000 cd/m 2 at V = 12 V, J = 490 mA/cm 2 . Maximum efficiency was 20 lm/W at 3.1 mA/cm 2 .

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  5. [국내논문]   Polymer based blue electrophosphorescent light emitting devices  

    Lee, Chang-Lyoul (School of Materials Science and Engineering, Seoul National University, San 56-1, Shillim-Dong, Kwanak-Gu, Seoul 151-744, South Korea ) , Ragini Das, Rupasree (Department of Materials Science and Engineering, Kwangju Institute of Science and Technology, 1 Oryong-Dong, Buk-gu, Kwangju 500-712, South Korea ) , Kim, Jang-Joo (School of Materials Science and Engineering, Seoul National University, San 56-1, Shillim-Dong, Kwanak-Gu, Seoul 151-744, South Korea)
    Current applied physics : the official journal of the Korean Physical Society v.5 no.4 ,pp. 309 - 313 , 2005 , 1567-1739 ,

    초록

    Abstract A series of bis-orthometalated monocyano Ir(III) complexes, [Ir(ppy) 2 PX 3 CN], (X=Oph, Ph and n -bu) were synthesized and the influence of the steric and electronic effects of the phosphine ligand on the photophysical and electrochemical properties of complexes were studied. These cyano phosphine complexes emit light from an admixture of triplet metal-to-ligand charge-transfer ( 3 MLCT) and ligand centered (LC) states in the region of 455–498 nm with a vibronic progression. The trends of the photophysical and electrochemical properties of metal complexes in the series were well understood by the electronic parameter of the phosphine ligands. Polymer light emitting devices were fabricated by doping Ir(ppy) 2 P( n -bu) 3 CN in the PVK host and the device performances were investigated. The maximum external quantum efficiency ( η ex ) was 1.45% for a 10 wt% Ir(ppy) 2 P( n -bu) 3 CN doped PVK device. A power efficiency of 0.99 lm/W at 230 cd/m 2 and 6 mA/cm 2 was obtained. The corresponding chloro complexes of the general formula [Ir(ppy) 2 PX 3 Cl] were also synthesized and the optical and device properties were compared with the cyano complexes.

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  6. [국내논문]   Luminescence and photoelectric properties of thiophene dendrimer spin-coated films  

    Shinbo, Kazunari (Department of Electrical and Electronic Engineering, Niigata University, Niigata 950-2181, Japan ) , Ikeda, Yoshifumi (Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan ) , Xia, Chuanjun (Department of Chemistry, University of Houston, Houston, TX 77204-5003, USA ) , Kato, Keizo (Department of Electrical and Electronic Engineering, Niigata University, Niigata 950-2181, Japan ) , Kaneko, Futao (Department of Electrical and Electronic Engineering, Niigata University, Niigata 950-2181, Japan ) , Advincula, Rigoberto C. (Department of Chemistry, University of Houston, Houston, TX 77204-5003, USA)
    Current applied physics : the official journal of the Korean Physical Society v.5 no.4 ,pp. 314 - 316 , 2005 , 1567-1739 ,

    초록

    Abstract Thiophene dendrimer spin-coated films were fabricated and the optical and photoelectric properties were investigated. Absorption edge and peak of photoluminescence (PL) spectra for the film were observed at around 550 and 618 nm, respectively. The excitation spectrum almost corresponded with optical absorption. From the voltage vs. current properties, the Schottky conductions were estimated in the indium tin oxide (ITO)/dendrimer/Al device. Photoelectric properties were also observed and the action spectra of the photocurrent in the device also corresponded with the absorption spectrum.

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  7. [국내논문]   Study of interfacial polarization phenomena in organic films by MDC, SHG and surface potential measurement  

    Iwamoto, Mitsumasa (Corresponding author ) , Manaka, Takaaki (Department of Physical Electronics, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan ) , Yoshizaki, Kei (Department of Physical Electronics, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan)
    Current applied physics : the official journal of the Korean Physical Society v.5 no.4 ,pp. 317 - 320 , 2005 , 1567-1739 ,

    초록

    Abstract Carrier injection, carrier separation, and carrier transport in the films are key processes in organic devices. Therefore, the understanding of interfacial electrostatic phenomena is of crucial importance. From the view point of dielectric physics, we have been studying the surface polarization phenomena. Using Maxwell displacement current (MDC) measurement, optical second harmonic generation (SHG) measurement, and Kelvin-probe surface potential measurement, surface polarization phenomena at the interfaces have been elucidated experimentally and theoretically. This paper describes how the surface polarization phenomena can be clarified by these measurements. Finally, our experiment on evaporated Alq 3 film is shown.

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  8. [국내논문]   Organic light emitting diodes with nanostructured ultrathin layers at the interface between electron- and hole-transport layers  

    Kato, Keizo (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan ) , Takahashi, Kazuki (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan ) , Suzuki, Keisuke (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan ) , Sato, Takayuki (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan ) , Shinbo, Kazunari (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan ) , Kaneko, Futao (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan ) , Shimizu, Hidehiko (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan ) , Tsuboi, Nozomu (Department of Material Science and Technology, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan ) , Tadokoro, Toyoyasu (R&D Center, Nippon Seiki Co., Ltd., 1-190-1 Fujihashi, Nagaoka 940-2141, Japan) , Ohta, Shinichi
    Current applied physics : the official journal of the Korean Physical Society v.5 no.4 ,pp. 321 - 326 , 2005 , 1567-1739 ,

    초록

    Abstract Organic light emitting diodes (OLEDs) with nanostructured ultrathin layers inserted at the interface between electron- and hole-transport layers were investigated. The fundamental structure of the OLEDs fabricated by a vacuum evaporation method was indium-tin-oxide (ITO) anode/copper phthalocyanine (CuPc)/ N,N ′ -diphenyl- N,N ′ - bis (3-methylphenyl)-1,1 ′ -diphenyl-4,4 ′ -diamine (TPD)/8-hydroxyquinoline aluminum (Alq 3 )/LiF/Al cathode. Fullerene (C 60 ) and rhodamine B (RhB) molecules were used as the nanosutructured ultrathin layers inserted at the interface between the Alq 3 and TPD layers. The electroluminescent (EL) properties have been measured for the OLEDs with C 60 and RhB ultrathin layers and the dependences on the thickness and the position of the inserted layers were examined. For the OLEDs with the C 60 ultrathin layer, the improvements of the drive voltage and EL efficiency were observed. The OLED with the inserted C 60 ultrathin film of a monolayer thickness showed the highest efficiency, which was twice as large as that without C 60 layer. On the contrary, the improvements were not observed for the OLEDs with the RhB ultrathin layer.

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  9. [국내논문]   Study on the electronic structure of pyrazoline derivatives with different substituents  

    Yang, G.B. (Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University, Changchun 130023, PR China ) , Wu, Y. (Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University, Changchun 130023, PR China ) , Tian, W.J. (Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University, Changchun 130023, PR China ) , Zhou, X. (State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, PR China ) , Ren, A.M. (State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, PR China)
    Current applied physics : the official journal of the Korean Physical Society v.5 no.4 ,pp. 327 - 330 , 2005 , 1567-1739 ,

    초록

    Abstract The electronic structures of a series of pyrazoline derivatives are investigated by means of quantum chemical calculation methods B3LYP/6-31G and ZINDO-SOS, the semi-experiential method AM1 and PM3 as well as the UV–Vis absorption spectroscopy and cyclic voltammograms (CVs) experiment. The results suggest that the theoretical findings are consistent with the experimental observations, indicating that different constituents could considerably alter the electronic structure, i.e., HOMO level, LUMO level and energy gap.

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  10. [국내논문]   High-efficiency blue and white phosphorescent organic light-emitting devices  

    Tokito, Shizuo (NHK Science and Technical Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan ) , Tsuzuki, Toshimitsu (NHK Science and Technical Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan ) , Sato, Fumio (NHK Science and Technical Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan ) , Iijima, Toshiki (Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8610, Japan)
    Current applied physics : the official journal of the Korean Physical Society v.5 no.4 ,pp. 331 - 336 , 2005 , 1567-1739 ,

    초록

    Abstract We have significantly improved the efficiency of blue and white phosphorescence from organic light-emitting devices (OLEDs) based on phosphorescent iridium complexes. To improve the emission efficiency, 4,4 ′ -Bis(9-carbazolyl)-2,2 ′ -Dimethyl-biphenyl (CDBP), which has a high triplet energy, was used as the carrier-transporting host for the emissive layer. The blue phosphorescent OLED exhibited a maximum external quantum efficiency of 10.4%, which corresponds to a current efficiency of 20.4 cd/A. This result can be explained as due to the efficient confinement of triplet energy on blue phosphorescent molecules, which is consistent with the results of transient photoluminescence experiments. The white phosphorescent OLED with greenish-blue and red emissive layers exhibited a maximum external quantum efficiency of 12% and a luminous efficiency of 18 cd/A. This is primarily attributed to the improvement of greenish-blue emission efficiency as well as the emission efficiency of the blue phosphorescent OLED.

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