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Published: January 29, 2009
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Article type: Index
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Published: January 29, 2009
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Shinji YAMASHITA, Hiroko KOMINAMI, Yoichiro NAKANISHI, Kazuhiko HARA, ...
Article type: Article
Session ID: IDY2009-1
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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White LED is expected to as lighting of the next generation, for example, head lightings, LCD back lightings, illuminations and so on. However, red emitting phosphors used for white LED is lower luminance efficiency than other phosphors. La_2O_2S:Eu is known as red emitting phosphor, it shows good luminescence under near-ultraviolet excitation. In this study, synthesis of La_2O_2S:Eu using the citric-acid-gel method has been investigated. As the result, the particle size can be controlled by changing pre-firing conditions.
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Xin LIU, Hiroko KOMINAMI, Yoichiro NAKANISHI, Kazuhiko HARA
Article type: Article
Session ID: IDY2009-2
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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There has been increasing interest in hexagonal boron nitride (h-BN), which shows UV emission at 215nm. Aiming at the application of this material as powder phosphors, we have investigated the effect of the annealing condition at various atmospheres (N_2, H_2, NH_3 and O_2) on its UV emission. The intensity of the 320nm emission band decreased with the annealing at more than 1200℃ in a vacuum. It also decreased in the H_2 and NH_3 atmosphere, while increased by the annealing at 900℃ in the O_2 atmosphere.
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Tomoharu SANO, Hiroko KOMINAMI, Yoichiro NAKANISHI, Kazuhiko HARA
Article type: Article
Session ID: IDY2009-3
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Liquid phase synthesis of ZnCdO powder under the high-pressure conditions has been investigated for the preparation of multi-layered ZnO/ZnCdO/ZnO particles, for which lower temperature process is preferred to prevent inter-diffusion between the layers. The results, has shown that high-pressure firing is highly effective in terms of suppression of defects, leading to the enhancement of exciton emission.
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H. Komoda, H. Kobayashi, Y. Kawanishi, H. Kominami, Y. Nakanishi, K. H ...
Article type: Article
Session ID: IDY2009-4
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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In contrast to the conventional powder phosphors consisting of particles with a uniform material composition, GaN-based nanostructure-embedded particles, which consist of GaN quantum dots or quantum wells in the AlN matrix, has been proposed. We can expect the novel phosphors to have higher luminescence efficiencies owing to the carrier confinement effect. To date, we have focused mainly on the synthesis and characterization of AlN core particles formed by the first process stage. In this study, we studied the conditions systematically, and found that the crystallinity of AlN core particle depends on the reaction temperature and atmosphere.
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Toshiki Nagura, Hiroko Kominami, Yoichiro Nakanishi, Kazuhiko Hara
Article type: Article
Session ID: IDY2009-5
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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ZnAl_2O_4:Mn is known as green phosphor which emits luminescence of high color purity. We have investigated the effects of synthesis parameters on the properties of the phosphor prepared by solid phase method in order to improve the luminescent characteristics. The properties of the sample strongly depended on reduction temperature and Zn content in starting materials. The brightness and color purity changed with the reduction temperature probably due to variation in Mn^<2+> concentration and crystal structure of ZnAl_2O_4 respectively. It was also found that Zn content in starting materials influenced the trend.
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Toshikatsu SAKAI, Shinji OKAMOTO, Katsu TANAKA
Article type: Article
Session ID: IDY2009-6
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Bi-activated SrGa_2S_4 (SrGa_2S_4:Bi) phosphor exhibits green luminescence with a peak wavelength of 533nm and a full width half maximum (FWHM) of 55nm. This luminescence is due to the 6p-6s transition in the 6s^2 configuration of Bi^<3+>. As SrGa_2S_4 is co-activated by Bi^<3+> and Mn^<2+> ions, the excitation band around 400nm is enhanced relative to that around 300nm.
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Kyosuke TERADA, Takahisa YAMASAKI, Toshiaki SEINO, Hiroko KOMINAMI, Yo ...
Article type: Article
Session ID: IDY2009-7
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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SrGa_2S_4:Eu^<2+> thin film phosphors, which are expected as green emitting phosphors for FEDs and white-LEDs, were prepared with two-source electron beam evaporation technique in which SrS:Eu and Ga_2S_3:Eu pellets were used as source materials and these were evaporated simultaneously. To lower annealing temperature to make the film phosphor was tried by using both thermal annealing at 500℃ and laser annealing, in addition to the conventional high temperature at around 850℃. The diffraction peaks of SrGa_2S_4 by XRD and the green emission peaked at 530nm of SrGa_2S_4:Eu^<2+> in PL and CL were obtained also by the [lower temperature and laser] annealing. These results mean that the SrGa_2S_4:Eu^<2+> thin film phosphors can be prepared also by the low temperature annealing under an assist with the laser annealing. However, the luminance of the film annealed by this method is about 2000cd/m^2 which is lower than 30000cd/m^2 of the film annealed at high temperature annealing under excitation with 10kV and 60μA/cm^2. Therefore, the improvement of the crystallinity and luminescent properties of the films annealed by the [lower temperature and laser] annealing is the issue in future.
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Nobutoshi KISHI, Takao ISHIMA, Yasuhiro WATANABE, Daisuke IDE, Souichi ...
Article type: Article
Session ID: IDY2009-8
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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BaTiO_3 thick-dielectric films were prepared by the doctor blade method to obtain the high performance inorganic electroluminescent devices with peeling off process. Before sintering of dielectric film, the thick-dielectric films were coated on the setter and organic films. In a second case, dielectric films on the organic films were transferred on the setter after the drying process. As a setter ZrO_2 was used to obtain a ceramic sheet. Many cracks were appeared in a thick film dielectric directly coated on the setter. On the other hand crystal growth was improved in the transferred films from organic films. High dielectric constant of 6500 was obtained from dielectric sheet.
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Mitsuru NITTA, Takahiro KOSHIBA, Yoshinobu MIYAMOTO, Koutoku OHMI
Article type: Article
Session ID: IDY2009-9
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Ba_2SiS_4:Ce is expected as a new blue EL material for low temperature process, since the phosphor thin film is crystallized below 700℃. In this paper, improvement in crystallographic and luminescent characteristics has been attempted by supplying excess Si, and installing foundation layer. A proper anneal condition has been also investigated.
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Keiichi SAHARA, Junichi ISHINO, Haruki FUKADA, Toshihiro MIYATA, Tadat ...
Article type: Article
Session ID: IDY2009-10
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Inorganic thin-film electroluminescent (TFEL) devices were fabricated using an oxide phosphor emitting layer prepared on a sapphire substrate with either an R- or A-plane lattice structure. A high-luminance in green emission was obtained in a single-insulating-layer-type or double-insulating- layer type TFEL device fabricated using a postannealed Zn_2Si_<0.6>Ge_<0.4>O_4:Mn thin film deposited on a R-plane sapphire sheet substrate. Bendable and see-through Zn_2Si_<0.6>Ge_<0.4>O_4:Mn TFEL lamps were demonstrated using a double-insulating-layer-type device fabricated on a R-plane sapphire sheet with a thickness of approximately 60μm.
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Kouhei UEDA, Shun MATSUI, Haruki FUKADA, Toshihiro MIYATA, Tadatsugu M ...
Article type: Article
Session ID: IDY2009-11
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Blue-emitting thin-film electroluminescent (TFEL) devices fabricated using a La_2O_3:Bi thin film and a thick BaTiO_3 ceramic sheet have been newly developed. Two types of thick-ceramic-insulating-layer-type TFEL devices were fabricated with or without a ZnS thin-film carrier acceleration layer. A luminance of 46.9cd/m^2 was obtained in a TFEL device fabricated with a ZnS thin-film layer and La_2O_3:Bi thin-film emitting layer deposited with a Bi content of about 2.5at.% at approximately 250℃ and postannealed at approximately 1000℃ and driven at 1kHz. The device showed blue EL emission corresponding to CIE chromaticity coordinates of (x=0.17, y=0.27).
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Yuki IMAI, Tomokazu SHIGA
Article type: Article
Session ID: IDY2009-12
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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In order to reduce the data voltage of PDP, a drive technique utilizing a floating pulse was developed for a self-erase-discharge addressing. Floating pulse enables a use of higher wall-charge-accumulating pulse voltage, resulting in the reduction of address voltage. With the address technique, minimum address voltage was 0V. Light emission duty was 70% when the number of groups and subfields were 3 and 15, respectively. Voltage margin of the wall-charge-accumulation pulse was 10V.
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Seita IKEDA, Harimu SHIN, Tomokazu SHIGA
Article type: Article
Session ID: IDY2009-13
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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The multi-width scan pulse, erase-addressing scheme provides high speed and low voltage addressing. However the dynamic voltage margin is influenced by the number of sustain pulses before the addressing. In this report, the scan pulse widths were adjusted according to the number of sustain pulses for obtaining large margin. It was found that more than 19 sustain pulses are necessary when Full-HD PDP is driven with 24 contiguous-subfield, single-scan, 14 grouped AWD scheme. The width of scan pulse ranged from 0.2μs to 0.6μs with an average of 0.52μs. Driving with 3 sustain pulses is also possible when the number of groups is increased to 30 or the number of subfield is reduced to 19.
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Takenobu USUI, Keiji ISHII, Yoshikuni HIRANO, Yoshimichi TAKANO, Yukio ...
Article type: Article
Session ID: IDY2009-14
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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We are currently in the process of developing Super-Hi-Vision (SHV) system with 4320 scanning lines. In order to reproduce the image obtained on SHV on plasma display panel (PDP), the frequency of address drive circuit must be increased. This is because the address discharge period for 4320 scanning lines is so long that the desired frame rate and brightness cannot be secured for PDP. However, an increase in the frequency of the address drive circuit can result in unstable discharge and image degradation. Hence, we propose a method for simultaneous scanning of multiple lines to shorten the address discharge period and also perform a subjective assessment test to evaluate the quality of the image obtained with this method. The test results reveal a significant degradation in image quality when this method is applied to subfields with a large luminescence weight. We also confirm that it is advantageous to use the minimum error method to choose the display data.
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Yo KIDA, Hidetaka SHIMAWAKI, Yoichiro NEO, Hidenori MIMURA, Katsuhisa ...
Article type: Article
Session ID: IDY2009-15
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Metal-oxide-semiconductor (MOS) cathode arrays based on nanocrystalline silicon covered with a thin oxide film prepared by a pulsed laser ablation technique have been fabricated and their emission properties have been investigated. The electron emission occurred at the gate voltage higher than the work function of the Au gate, and was relatively stable. We observed the emission image on the phosphor screen and the emission divergence was estimated to be less than 3°.
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Tadao UETSUKI, Takuma OOHIRA, Yuji TAKEDA, Hidetoshi YANO, Osamu FUKUM ...
Article type: Article
Session ID: IDY2009-16
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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To improve the reliability on the CCL, it is very important to grasp the damage of the cathode at the end of lamp life. Authors have studied the influence of the mercury of the damage to the Ni cathode and Mo cathode. As the result, it was revealed that the damage to the cathode increased when the mercury vapour vanished from the lamp, and that the way to get damage to the Ni cathode differed from that to the Mo cathode.
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Junichi NOMOTO, Manabu KONAGAI, Haruki FUKADA, Toshihiro MIYATA, Tadat ...
Article type: Article
Session ID: IDY2009-17
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Impurity-doped ZnO thin films suitable for transparent electrode applications in LCDs that reduce resistivity and improve the uniformity of resistivity distribution have been prepared by newly developed oxidization-suppressing dc magnetron sputtering deposition methods that superimpose rf power and use more optimized targets. Descriptions are also presented concerning the observed increase in the resistivity of impurity-doped ZnO thin films resulting from exposure to long-term testing in a high humidity environment (air at 90% relative humidity and 60℃) as well as the increase in resistivity associated with a decrease of film thickness. The resistivity stability of impurity-doped ZnO thin films might be considerably improved by co-doping with another impurity.
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Tatsuya KANEKO, Ryotaro MORI, Koro TAKAHASHI
Article type: Article
Session ID: IDY2009-18
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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The high power LED light source for projection system using a three-dimensional LED array with an ellipsoidal reflection mirror has been developed. The LED array has an optical structure similar to the conventional halogen lamp and a liquid cooling system. It can be used in the projection system instead of conventional light source. The light source enables increase the high light collecting efficiency and the LED current by liquid cooling. This system can achieve 32% light collecting efficiency and more than 80% bright uniformity.
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Toshihiko KANBARA, Nodoka OKISAWA
Article type: Article
Session ID: IDY2009-19
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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In the various field such as virtual reality, the immersive display system is produced and developed as an effective device for human. In our research, we want to constract an immersive display system with a huge concave hemi-spherical screen. First, we have tried to constract a display system on the screen by LCD projector with a fish-eye lens. However, some problems are caused in this method. Second, we try to re-constract the disylay system with full-color LEDs which shine as pixels on the screen. We describe the technical design of the display system.
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Takashi SUZUKI, Takeshi FUKUDA, Norihiko KAMATA
Article type: Article
Session ID: IDY2009-20
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Since polymer light-emitting diodes can be fabricated by a solution process, these devices are attractive due to the low fabrication cost and the large emitting area. Though a multilayer structure is necessary to improve device performances, it is difficult to fabricate by a solution process. We investigated another deposition process, called as an electrospray deposition. In this method, a high voltage of approximately several kV is applied to a nozzle, from which the polymer solution is sprayed, and the organic solvent is evaporated before reaching the substrate. As a result, multilayer organic films can be deposited without dissolving the under layer. In this report, we investigated a single layer structure of polyfluorene-based polymers. The photoluminescence spectrum and the surface roughness were investigated by changing the applied voltage.
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Hirotaka ASAKI, Ryohei KOBAYASHI, Takeshi FUKUDA, Norihiko KAMATA
Article type: Article
Session ID: IDY2009-21
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Generally, the luminance efficiency and the long term stability of thermal evaporation based organic light-emitting diodes are superior to those of wet-process based devices. In addition, the light extraction efficiency of the top-emission device is higher than that of the bottom emission device owing to the optical loss of transistors. In this report, we investigated the top-emission organic light-emitting diode with conductive polymers deposited by the electrospray deposition. This conductive polymer has high transparency of more than 80% at a visible wavelength region. The blue emission at 438nm has been achieved by combination with fluorine-based polymers as an emitting layer and conductive polymers as an anode. The maximum luminance of 3.34cd/m^2 was achieved at 30V.
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Genichi MOTOMURA, Kenichiro WATANABE, Toshimitsu TSUZUKI, Shizuo TOKIT ...
Article type: Article
Session ID: IDY2009-22
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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We report on phosphorescent organic light-emitting diodes (OLEDs) using 4,4'-bis(N-carbazolyl)-9,9'-spirobifluorene (CFL), which has spirobifluorene and two carbazole moieties, as a thermally stable host material. The thin film of CFL has good thermally stability and it wasn't crystallized at 150℃. The OLED using CFL as a host material and tris (2-phenylpyridine) iridium(III) (Ir(ppy)_3) as a guest material exhibited an external quantum efficiency over 10%. The efficiency was comparable to those of an OLED that using conventional 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP) as a host.
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Keita KANBE, Yasufumi IIMURA
Article type: Article
Session ID: IDY2009-23
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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In order to apply a UV curable liquid crystal film to a gate insulator of organic TFTs, we have done electric characterization of MIM devices using the LC film. Experimental results show that sufficient insulating properties of the LC film are obtained with increasing UV exposure dosage during the polymerization processes and hole accumulation in a MIS device using pentacene on a LC film is observed, indicating the usefulness of a UV curable liquid crystal film for organic TFT devices.
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Michinori Honma, Takao Horiuchi, Toshiaki Nose
Article type: Article
Session ID: IDY2009-24
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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The emission properties of liquid crystal (LC) electrochemiluminescent (ECL) cells were studied to realize various emission colors. The rubrene-doped cell showed markedly high luminance and current density, however, the properties cannot fully be explained by HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) levels of dyes. Next, the emission properties of LC-ECL cells doped with DPVBi- (4,4'-bis(2,2-diphenyl-ethen-1-yl)biphenyl) based fluorescent dyes substituted with methyl and butyl groups were investigated. The luminance was decreased by introducing those alkyl groups. It is considered that the disruption of the current balance of the radical cation and anion is caused by the electron-releasing alkyl groups.
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Masahiro NAKAGAWA
Article type: Article
Session ID: IDY2009-25
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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In this paper we shall examine the nematodynamics which involves both the microscopic order parameters and the macroscopic director based on Landau-de Gennes theory of nematics. Introducing a Lagrange multiplier corresponding to the conservation of trace of the tensor order parameter, the threshold condition of planar alignment cell will be analytically explored to show the agreement with the conventional vector approach on the bases of Oseen-Zocher-Frank theory. In addition some practical numerical computations will be presented so as to describe the relationship between the microscopic orders and the macroscopic director alignments under a certain electric field. In practice, the microscopic orders are found to be affected by the external electric field as well as the anchoring strength at the boundaries.
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Tadashi KISHIMOTO, Kazuhiro WAKO, Takahiro ISHINABE, Tetsuya MIYASHITA ...
Article type: Article
Session ID: IDY2009-26
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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A highly precise measurement method of material parameters of liquid crystal (LC) about the electro-optical property was discussed. On C-V (Capacitance-Voltage) fitting method, which measures elastic constants (K_<11>, K_<33>) and dielectric permittivity (ε_‖, ε_⊥) of LC, the optimization for a voltage driving scheme of LC in the capacitance measurement using LCR meter was experimentally analyzed. And a new compensation method for the capacitance of alignment layer and the treatment method of anchoring strength in LC cell, whose effects were ignored in the conventional measurement method, were proposed. We obtained reliable measurement values using our novel C-V fitting method on the C-V property of LC layer.
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Masami OGURA, Rumiko YAMAGUCHI
Article type: Article
Session ID: IDY2009-27
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Photostability of Liquid Crystal (LC) materials and alignment layer is very important in affecting the life time of the LC devices. In this report, the photo degradation of LC cell has been investigated by the blue-violet (403nm) laser beam irradiation. The laser beam was focused on LC cells with homogeneous, homeotropic, twisted nematic and hybride orientation. The degradation of the TN cell started earliest in all cells, since azimuthal anchoring strength might reduce. The photo stability did not change when the cell is irradiated under the voltage application.
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Hideo KAWANO
Article type: Article
Session ID: IDY2009-28
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Matrix methods have been used for transmittance analysis of LCDs conventionally. In these methods, refractive-index distribution of media that light waves propagate is assumed to be one-dimensional. Because of this, in case of two-dimensionally distributed media represented by IPS-LCDs, analysis accuracy of the methods is worse than one-dimensional case. This is more remarkable around at neighborhood of electrodes. Therefore, matrix methods can not be used for analysis of dark line areas along to the electrode edge of IPS-LCDs, especially in case of the width to be less than 2um. In this paper author reports results of the dark line areas analysis by FDTD method.
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Hiroshi MURAI, Kazuo SEKIYA, Kazuhiro WAKO, Tadashi KISHIMOTO, Takahir ...
Article type: Article
Session ID: IDY2009-29
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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We produced a 6.5inch-diagonal full-HDTV LCD portable monitor. Since we adopted field sequential color method combined with a blockwise scanning backlight with RGB LEDs for it, we could easily add a feature to switch the LED's wide color gamut to the standard sRGB color gamut on user's demand.
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Hidehiro SEKI, Kazuo SEKIYA, Kazuhiro WAKO, Shigeru NAKANO, Tadashi KI ...
Article type: Article
Session ID: IDY2009-30
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Power consumption of a field sequential color display panel is investigated. As the results, the 30 inch liquid crystal display panel with 200cd/m2 could be driven by lower than 20W. Reduction of the power consumption originated color filter less technology. An OCB liquid crystal display with the field sequential color method has low power consumption and contributes to the progress of imaging media strongly.
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Shutaro KAMATA, Hirokazu FURUE, Hiroto SATO, Hiroshi KIKUCHI, Hideo FU ...
Article type: Article
Session ID: IDY2009-31
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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We proposed a new flexible liquid crystal (LC) device, in which twisted nematic LC layer is stabilized by molecular-aligned polymers. The polymer walls and networks, which were formed by photo-polymerization-induced phase separation, suspended two plastic substrates, and the polymer networks also stabilized twist LC alignment. The polymer walls and networks increased the threshold voltage for LC alignment change. However, the polymer networks fastened the decay response time because of reduction of LC back flow phenomenon.
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Ryota KOHNO, Yasufumi IIMURA
Article type: Article
Session ID: IDY2009-32
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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Recently, display devices using plastic substrates have attracted people's interests due to their many advantages over conventional display devices with glass substrate, such as flexibility, light weight, etc. But reliable process technologies for fabricating flexible displays have not been established yet. In this work, we study fabrication processes of liquid crystal displays (LCDs) using plastic substrates to develop flexible LCDs., and we succeed in fabricating a flexible VA-LCD, which shows comparable display performance to a VA-LCD using glass substrates.
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Tsubasa SAEKI, Reiji HATTORI
Article type: Article
Session ID: IDY2009-33
Published: January 29, 2009
Released on J-STAGE: September 20, 2017
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An electrostatic capacitive type touch panel which can be applied to the bistable and passive-matrix driven electronic paper display and can reduce a cost is presented. The touch panel needs no additional structures such as electrodes or films only for a touch panel operation. In addition, the number of capacitance sensing terminals can dramatically be reduced by using drivers for writing images as a scanner switch. In this report, we explain the operational principle and panel structure of this new touch panel and show the experimental results supporting the operational principle using the Quick-Response Liquid-Powder-Display (QR-LPD^<TM>).
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Article type: Appendix
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Published: January 29, 2009
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Article type: Appendix
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Published: January 29, 2009
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Article type: Appendix
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Published: January 29, 2009
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