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Effect of thin LiF layers in multi-layered PVCz polymer LEDs
Hiroki Yoshihara,Yousuke Tanaka,Suiko Tanaka,Masahiko Kitagawa,Hiroyuki Kusano,Hiroshi Kobayashi 한국물리학회 2005 Current Applied Physics Vol.5 No.1
We have investigated in detail the dependence of the electroluminescent characteristics on the thin LiF layer inserted under theelectrode layer of multi-layered PVCz polymer light emitting diode (PLED). Clear dependency has been obtained and reduction inthe operating voltage, improvement in luminance and the luminous and current eciencies have been realized with the optimizationof the thickness. The eect of thin LiF layer has been analyzed by using the current voltage dependence at low voltage regions andthe current is supposed to be carried considered LiF layer by tunnel injection between the PVCz layer and the electrode layer
Synthesis and electrical conductivity of bulk tetra-valent cerium pyrophosphate
Hiroaki Onoda,Yousuke Inagaki,Akihide Kuwabara,Naoto Kitamura,Koji Amezawa,Atsushi Nakahira,Isao Tanaka 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.3
Tetra-valent cerium pyrophosphate was synthesized from cerium oxide and phosphoric acid by heating. The sintering processes, pressure-less sintering (PLS), spark plasma sintering (SPS), and hydrothermal hot pressing (HHP), were attempted to form bulk pyrophosphate. Furthermore, the electrical conductivity of bulk cerium pyrophosphate was investigated. Tetravalent cerium pyrophosphate was synthesized by heating at 700 oC for 20 hours. The hydrothermal hot pressing process was a suitable method to synthesize bulk tetra-valent cerium phosphate.
Upham, Jeremy,Fujita, Yuu,Kawamoto, Yousuke,Tanaka, Yoshinori,Song, Bong Shik,Asano, Takashi,Noda, Susumu Optical Society of America 2013 Optics express Vol.21 No.3
<P>We develop a silicon photonic crystal nanocavity device capable of performing targeted optical pulse capture and release via distinct ports on demand, based on dynamic Q factor control. The capture of 4 ps pulses and their release up to 332 ps later is directly observed by time-resolved measurements of the energy behaviour in both the nanocavity and emitted from the release port. We also discuss how the behaviour of excited free carriers dictates the performance of such dynamic devices. (C) 2013 Optical Society of America</P>
OPTICAL-INFRARED AND HIGH-ENERGY ASTRONOMY COLLABORATION AT HIROSHIMA ASTROPHYSICAL SCIENCE CENTER
UEMURA, MAKOTO,YOSHIDA, MICHITOSHI,KAWABATA, KOJI S.,MIZUNO, TSUNEFUMI,TANAKA, YASUYUKI T.,AKITAYA, HIROSHI,UTSUMI, YOUSUKE,MORITANI, YUKI,ITOH, RYOSUKE,FUKAZAWA, YASUSHI,TAKAHASHI, HIROMITSU,OHNO, MA The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
The Hiroshima Astrophysical Science Center (HASC) was founded in 2004 at Hiroshima University, Japan. The main mission of this institute is the observational study of various transient objects including gamma-ray bursts, supernovae, novae, cataclysmic variables, and active galactic nuclei by means of multi-wavelength observations. HASC consists of three divisions; the optical-infrared astronomy division, high-energy astronomy division, and theoretical astronomy division. HASC is operating the 1.5m optical-infrared telescope Kanata, which is dedicated to follow-up and monitoring observations of transient objects. The high-energy division is the key operation center for the Fermi gamma-ray space telescope. HASC and the high-energy astronomy group in the department of physical science at Hiroshima University are closely collaborating with each other to promote multi-wavelength time-domain astronomy. We report the recent activities of HASC and some science topics pursued by this multi-wavelength collaboration.