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Article type: Cover
Pages
Cover1-
Published: March 06, 1998
Released on J-STAGE: June 23, 2017
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Article type: Index
Pages
Toc1-
Published: March 06, 1998
Released on J-STAGE: June 23, 2017
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Kenji Furukawa, Manabu Uchida, Takenori Izumizawa
Article type: Article
Pages
1-6
Published: March 06, 1998
Released on J-STAGE: June 23, 2017
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Materials for organic EL devices are summarized. The silole ring is a novel core component for efficnent electron transporting materials. The feature is conspicuous by comparison of the calculated LUMO energy levels of the silole ring with those of some nitrogen-containing cyclic compounds. The silole derivatives with 2 ring-system have high glass transition temperatures and those with triphenylamino groups are useful bipolar compounds as the hole transporting material and the emissive one.
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Yuji Hamada, Hiroshi Kanno, Takeshi Sano, Hiroyuki Fujii, Yoshitaka Ni ...
Article type: Article
Pages
7-12
Published: March 06, 1998
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A volatile Eu complex, Eu (TTA)_3phen (TTA; thenoyltrifluoroacetone, phen; 1,10-phenanthroline), was synthesized and applied to an electroluminescent (EL) cell structure of [ITO/hole transport layer/emitting layer (host material; azomethine zinc complex, and dopant; Eu (TTA)_3phen)/MgIn]. The emitting layer were formed by a codeposition technique. A red emission (EL peak wavelength; 614 nm) with a very sharp spactral band was observed from the EL cell with 5 wt% Eu(TTA)_3phen, and maximum luminance of 137 cd/m^2 was achieved.
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Y. Shimada, T. Yagi, T. Ikeda, O. Takamatsu, H. Matsuda, K. Takimoto
Article type: Article
Pages
13-18
Published: March 06, 1998
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We present a new method to fabricate sharp metal tips for scanning probe microscopy. The metal tip, which is deposited on a silicon mold, is attached by metal-to-metal bonding to a metal pad on a substrate, and peeled off the mold. By applying this method, a platinum tip with a radius curvature of less than 15nm was successfully fabricated. We succeeded to form a tip on a piezoresistive cantilever, and obtained high resolution topography and surface conductance images, respectively.
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Yuji Nakazono, Toshiyuki Takagi, Hideo Ichinose, Atsushi Sawada, Shohe ...
Article type: Article
Pages
19-24
Published: March 06, 1998
Released on J-STAGE: June 23, 2017
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Residual DC phenomenon of LC cell is explained by using not only space charge polarization in LC layer but also orientation polarization of alignment layers and LC layer, then LC materials with negative dielectric anisotropy is evaluated based on this model. From simulation for orientation polarization annd experiments, it was found that residual DC by orientation polarization become considerable when specific resistively of alignment material is greater than 1.0×10^<14>[Ωcm]. Then properties of LC materials necessary for low residual DC values are discussed for various values of specific resistively of alignment layer.
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Goroh Saitoh, Masaharu Satoh, Etsuo Hasegawa
Article type: Article
Pages
25-30
Published: March 06, 1998
Released on J-STAGE: June 23, 2017
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In order to investigate the dynamic behavior of liquid crystal (LC) mixture, the molecular Dynamics (MD) calculation of the mixtures have been performed. The relaxation process from the state that forcibly oriented liquid crystal mixture was calculated by GEMS/MD program. Each compound in the mixture indicated the different order parameter (S). It was observed that a lower viscosity compound showed faster decay of S The S value of mixture was correspond to the phase transition temperature.
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E. Matsui, N. Matsuzawa, A. Yasuda
Article type: Article
Pages
31-36
Published: March 06, 1998
Released on J-STAGE: June 23, 2017
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The broadening threshold-voltage distribution realized by a novel gray-scale technique is explained as due to an increase in the smectic-layer tilt angles. It was found that microdomain growth is pinned by nanometer-scale particles. Hysteresis was reduced by increasing the conductivity of the alignment layers. The structural changes during switching were investigated by measuring the time-resolved shifts of the FT-IR peaks of the carbonyl group and the pyrimidine skeleton. Molecular orbital calculations suggest that the shifts of these groups in the IR peak can be attributed to changes in the local dielectric constants of the ambient environment. Orientation during switching in the SmC^* phase was found to be similar to that in the N^* phase.
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Toshiaki YOSHIHARA, Yoshinori KIYOTA, Tetsuya MAKINO, Hironori SHIROTO ...
Article type: Article
Pages
37-40
Published: March 06, 1998
Released on J-STAGE: June 23, 2017
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Improvement of the screen brightness was investigated by using a reflective type of direct driven SSFLCD with a single polarizer. We found that wavelength dependence of retardation : △ nd of the SSFLC cell has a significant influence on the substantial contrast ratio of the cell in terms of the reflective type of color display. Optimization of the wavelength dependence of △ nd provides us a good contrast ratio reflective type of SSFLCD.
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M. Yoneya, M. Ohta, M. Oh-e, H. Asuma, K. Kondo
Article type: Article
Pages
41-46
Published: March 06, 1998
Released on J-STAGE: June 23, 2017
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Electro-optical performances of in-plane switching mode TFT liquid crystal (LC) displays were analyzed by using device simulations. Electrode geometries, conductivity of black matrix and tilt angle of the LC molecules at the substrate surface were identified as key points to optimize the electronic performance (driving voltage, crosstalk) and optical performance (viewing angle), respectively.
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Article type: Appendix
Pages
App1-
Published: March 06, 1998
Released on J-STAGE: June 23, 2017
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