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- 저자 : Kenji Ebihara (검색결과 2 건)
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Sang-Moo Park,Kenji Ebihara,Tomoaki Ikegami,Boong-Joo Lee,Kyung-Bum Lim,신백균 한국물리학회 2007 Current Applied Physics Vol.7 No.5
In this work, indium-tin-oxide (ITO) electrode in organic light emitting device (OLED) was modified by using an O2 plasma treatment and plasma polymerized thiophene buffer layers were inserted between ITO (anode) and organic layer in order to improve the hole injection efficiency. Furthermore, electron injection to cathode (Al) in the test OLED seemed to be improved due to introduction of quantum well in the cathode. The plasma-polymerized thiophene buffer layer on the O2 plasma-treated transparent ITO electrode seemed to result in formation of a stable interface and consequently, reduction the hole mobility, which in turn caused enhanced recombination of hole and electron in the emitting layer. Compared with the test device without buffer layer, the turn-on voltage of the test device with the buffer layer was lowered by 1.0 V.
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Thermal analysis of carbon nanotube film irradiated by a pulsed laser
Toshiyuki Nakamiya,Tsuyoshi Ueda,Tomoaki Ikegami,Kenji Ebihara,Ryoichi Tsuda 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
The prepared multi-walled carbon nanotubes (MWCNTs) lm was mounted on the holder and the lm surface was ashed with asingle pulse of Nd:YAG laser (k = 532 nm) or a pulsed KrF excimer laser (k face damage was measured by inspecting the surface morphology. The dynamics of pulsed nanosecond laser heating process was sim-ulated by the solution of the one-dimensional heat conduction equation. The nite element method (FEM) was applied to solve theequation. The damage threshold energy density for MWCNTs lms ashed by a pulsed Nd:YAG laser were in the range 650 mJ/cm2and 790 mJ/cm2. At the laser uence of 790 mJ/cm2 with Nd:YAG laser, the surface reached the maximum temperature 913.C a t13 ns. Moreover, the Raman spectroscopy of MWCNTs lms before and after irradiation were measured. Graphitization occurredon the sample after irradiation over the threshold energy of surface damage.
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