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Volume 34 (1997)
- Issue 6 Pages 370-
- Issue 5 Pages 310-
- Issue 4 Pages 218-
- Issue 3 Pages 134-
- Issue 2 Pages 72-
- Issue 1 Pages 2-
Volume 34, Issue 4
Displaying 1-11 of 11 articles from this issue
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An Overview of Organic Electroluminescent DevicesYasuhiko SHIROTA1997 Volume 34 Issue 4 Pages 218-226
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSThis review article describes the mechanism for electroluminescence in organic materials, structures of organic electroluminescent (EL) devices, material requirements, materials for use in organic EL devices including both low molecular-weight organic compounds and polymers, and performance characteristics of singlelayer, double-layer, and multilayer organic EL devices.View full abstractDownload PDF (1672K) -
Dye Doped Electroluminescent DevicesHisakazu TAKAHASHI1997 Volume 34 Issue 4 Pages 227-232
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSThe purpose of this paper is to show that the host-guest system using a dye as dopant has effects on the high efficiency of organic electroluminescent devices. At first, it was showed that high luminous efficiency was obtained by quinacridone dopant in BeBq 2. Next, it was showed that the emission color changed from red to blue by using Europium complex as dopant. Last, it was found that the emission site, where the dopant is doped, influences the durability of organic electroluminescent devices.View full abstractDownload PDF (1837K) -
Organic Luminescent Devices with a Resonator StructureTakahiro NAKAYAMA1997 Volume 34 Issue 4 Pages 233-242
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSThe optical resonator structure enables the enhancement of the luminescent peak intensity, and it realizes multicolor displays, optical swithches, etc. with organic electroluminescences. In this paper, we report on their characteristics which is attractive in terms of both its fundamental physics and various applications.View full abstractDownload PDF (4219K) -
Organic Electroluminscent Display -The Present Status in its Development and some Problems to be solved in the Future-Hitoshi NAKADA1997 Volume 34 Issue 4 Pages 243-247
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSAn Organic EL display is an emissive type and it provides wide viewing angle, high contrast ratio and quick response time. We have developed a monochrome green dot-matrix type display using Organic EL devices. A pixel number of 256×64 with pixel size of 0.34mm×0.30mm, a luminance of 100cd/m2 and a contrast ratio of 100:1 or over have been achieved. The display consists of a passive matrix and is driven by constant current. The driving duty ratio is 1/64 and the frame rate is 150Hz. Custom IC's having 64 pins have been developed and they were bonded on the flexible tape (TCP: Tape Carrier Package). The display module is made compact by using the TCP. The next issues yet to be solved for the Organic EL display are to develop a full color display and a lager screen size. A few methods are proposed as to how to realize a full color display.View full abstractDownload PDF (1081K) -
Recent Progress in White-Light-Emitting Organic EL Devices and Polymer EL DevicesJunji KIDO1997 Volume 34 Issue 4 Pages 248-253
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSIn this article, white-light-emitting EL devices and polymer-based EL devices will be reported. Several white EL devices having different device architectures are discussed. Materials used for white EL devices include small molecules as well as polymers. In cases of small molecules, white light is generated by stacking several organic layers with different emission colors. In contrast, several fluorescent dyes are doped into a polymer emitter layer in case of polymer-based white EL devices. Three kinds of multicolor devices are introduced, which include white EL devices with color filters. Other multicolor devices are so-called “side-by-side” structure and blue EL with color conversion layers. Novel methods for the fabrication of side-by-side devices using polymers are also introduced.View full abstractDownload PDF (1754K) -
Yasumasa Kawaguchi, Masayuki NAKAJIMA1997 Volume 34 Issue 4 Pages 254-262
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSWe propose the new method about high resolution image expansion algorithms used DCT orthogonal algorithm and restoration algorithm based on super restoration. At first, image is divided into small blocks and transformed using DCT algorithm. Next, image is restored by an super resolution by DCT, in the case that a high frequency component is lacking. The Gerchberg-Papoulis repetition method is used as an super resolution and 1 dimension DCT is used to speed up the orthogonal transform. At last, we show the image magnification examination results using SCID. We can conclude that SN ratio is improved, using our proposed method.View full abstractDownload PDF (5542K) -
Toshio YADA, Taro MAEJIMA, Masaru AOKI1997 Volume 34 Issue 4 Pages 263-271
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSExperimental film formation of a positive photoresist solution dispensed on various size of wafers by spin coating was investigated. The baked films formed on larger wafers have thicker thicknesses in the first stage of the spinning due to the initial lower rates of outflow and become thinner ones in the later stages due to the higher rates of outflow in the intermediate stages and the higher rates of evaporation in the later stages. The minimum thickness deviations, which exist in the intermediate stages of the spinning, increase more distinct in the film formation on larger wafers.View full abstractDownload PDF (1190K) -
Subjective Evaluation Psychological Evaluation Methods of Print ImageTsuneo Suzuki1997 Volume 34 Issue 4 Pages 272-279
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSIn this techinical lectue, I briefly introduce the psychological methos for evaluating the image quality of print image. On the psychological evaluation of image quality, first we must know the structure of the image quality. Then we evaluate the unidimensional component of image quality by the psychophysical method or scaling method.View full abstractDownload PDF (1502K) -
Teruki IKEDA, Yusei OHKUBO1997 Volume 34 Issue 4 Pages 280-286
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSVibrational spectroscopy as Infrared (IR) and Raman spectroscopy is used in such various fields as polymer science, semiconductor industry and biochemistry. IR and Raman are useful for characterizing the surface of advanced materials. For example Raman spectroscopy isu tilized for structure determination of the diamond like carbon, which is coated on a magnetic disk. In this report, we discussed principles, systems and applications of IR and Raman spectroscopy. Particularly ATR and RAS (GAR) method are reported as interesting applications of IR spectroscopy.View full abstractDownload PDF (2330K) -
Noboru OHTA1997 Volume 34 Issue 4 Pages 287-292
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSDue to introduction of color managing system, quality control in color printing tends to employ colorimetric values rather than conventional density values. In this introductory papers, basic ideas of color measurement (colorimetry) are described mainly focusing on practical engineers. Firstly, basic facts of light and color are explained, and terminology and two colorimetric systems are introduced.View full abstractDownload PDF (1454K) -
Yoshihiro IWATA1997 Volume 34 Issue 4 Pages 293-295
Published: July 31, 1997
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSDownload PDF (1049K)
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