ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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23.21
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: March 05, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.21.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: March 05, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.21.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Temperature Dependence of Electroluminescence in Cz doped PVCz Double-Layerd EL Devices
    Shinji Kawakami, Toshihisa Tsushima, Yasuo Hirooka, Hiroyuki Kusano, M ...
    Article type: Article
    Session ID: IDY99-105
    Published: March 05, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.21.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Temperature dependence of electroluminescent properties of Cz doped PVCz double-layered EL devices has been studied. Luminance is more than 3000cd/m^2 at 110K and 500cd/m^2 at 300K. Temperature dependence of carrier mobility and barrier height at negative electrode has been studied by considering current-voltage characteristics. The temperature dependence of the hole mobility in Cz doped PVCz has been analyzed and the activation energy for carrier hopping has been derived. The tunneling carrier injection at negative electrode has been clearly observed and the barrier height has been determined.
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  • Dependence of Carrier Transport Properties on Cathode Metals in PVCz Double-Layered Organic EL Devices
    Daisuke Morita, Toshihisa Tsushima, Kazuaki Hatano, Tatsuhiro Sawada, ...
    Article type: Article
    Session ID: IDY99-106
    Published: March 05, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.21.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    PVCz double-layered organic EL devices with negative electrodes using magnesium, strontium and silver metals have been fabricated and dependence of electroluminescent characteristics on the cathode metal has been studied. The device structure is such as ITO/PVCz/PVCz: perylene/Metal. Luminance of 1000 cd/m^2 has been obtained for the devices without electron transport molecules in the layer adjacent to the negative electrode. Dependencies of threshold voltage of electroluminescence emission and barrier height at negative electrode on the metal work function have been clearly observed from the luminance-voltage characteristics and from the charge transport analysis based on Fowler-Nordheim plot, respectively.
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  • Organic EL devices using a gallium complex
    Y. Hamada, H. Kanno, T. Tsujioka, H. Takahashi, T. Usuki
    Article type: Article
    Session ID: IDY99-107
    Published: March 05, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.21.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A gallium complex (GaMq_2Cl) consisting of two 2-methyl-8-hydroxy-quinolines (Mq) and a chlorine was synthesized and used for the fabrication of organic EL devices. The photoluminescent peak of GaMq_2Cl at 492 nm was as strong in intensity as that of tris(8-hydroxyquinolinato)aluminum (Alq_3). The organic EL devices using GaMq_2Cl as an emitting material showed green luminance of 10, 490 cd/m^2. When it was used as an electron transport material in a rubrene doped device, an organic EL device with a high luminance of 27, 700 cd/m^2 was obtained.
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  • Analysis of ion transport in LC cells with asymmetric alignment layers
    Kenichi TAKAHASHI, Makoto JISAKI, Keiichi NITO, Koichi KAWASUMI
    Article type: Article
    Session ID: IDY99-108
    Published: March 05, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.21.0_19
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The presence of impurity ions in liquid crystal displays has long been blamed for degrading of devices. We have investigated the behavior of ions in bulk of the liquid crystal (LC) and in the interface between the LC and the alignment layer, using electro-optical, electrochemical and ζ-potential measurements. We report the effect of impurity ions in Nematic LC cells with asymmetric alignment layers made by different process. When a symmetric external electric field is applied to a Nematic LC cell, the internal dc voltage is built up, and the flicker is observed. This is a possible cause for impurity ions being introduced by the applied electric field and disturbing the absorption-desorption equilibrium.
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  • Image-Sticking Effect in AM-LCDs Caused by Ionic Impurities
    Nobuyoshi Sasaki
    Article type: Article
    Session ID: IDY99-109
    Published: March 05, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.21.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The transients of the transmittance and the voltage holding ratio(VHR) of a liquid crystal cell were measured by the bipolar pulse driving in order to clarify the influence of residual DC voltage to image-sticking effects. The pulse voltage with the condition of half-tone image driving was applied to the LC cell involving ions after the DC voltage application to induce the residual DC voltage. The resultant transmittance of the cell was lower than that of the unstressed level with increasing VHR as a function of DC application time. The drop of the transmittance is considered to be not caused by residual DC but the increase of the VHR due to decrease of mobile ion density.
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  • Dual Frequency Driven PDLC Displays : Addressable and Bistable Switching Character
    Junji Ohyama, Hiroshi Matsuda, Ken Eguchi
    Article type: Article
    Session ID: IDY99-110
    Published: March 05, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.21.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Reported is switching of bistable PDLCs with dual frequency drive. Low frequency voltage pulses (2.5kHz/100 V/>0.25 s) result in the transparent memory state. High frequency pulses (100kHz/80V/0.5s) return to the opaque memory state; which is a time useful for practical applications, e.g.still picture. Applying repeatedly high frequency voltage pulses recover the initial scattered state, which is different from above two states, for reproducible switching. Polymer content and surface treatment of substrates drastically affect the PDLC droplet formation and bistability without holding voltage.
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  • Design of Holographic Polymer Dispersed Liquid Crystal materials for High Reflectivity
    Tomohisa Goto, Koji Mimura, Taisaku Nakata
    Article type: Article
    Session ID: IDY99-111
    Published: March 05, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.21.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A holographic polymer dispersed liquid crystal (HPDLC) device is useful for color reflective LCD because it requires neither polarizer nor color filter. HPDLC devices with high reflectivity have been prepared by controlling the phase separation temperature of the HPDLC precursor. The acceleration of the phase separation is one of the guides for HPDLC with high reflectivity. In addition to this, a multi-layered HPDLC device and a HPDLC device having two gratings in a pixel have also been prepared.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: March 05, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.21.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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