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Keizo Kato,Kazuki Takahashi,Keisuke Suzuki,Takayuki Sato,Kazunari Shinbo,Futao Kaneko,Hidehiko Shimizu,Nozomu Tsuboi,Toyoyasu Tadokoro,Shinichi Ohta 한국물리학회 2005 Current Applied Physics Vol.5 No.4
Organic light emitting diodes (OLEDs) with nanostructured ultrathin layers inserted at the interface between electron- and hole-transport layers were investigated. The fundamental structure of the OLEDs fabricated by a vacuum evaporation method wasindium-tin-oxide (ITO) anode/copper phthalocyanine (CuPc)/N,N0-diphenyl-N,N0-bis(3-methylphenyl)-1,10-diphenyl-4,40-diamine(TPD)/8-hydroxyquinoline aluminum (Alq3)/LiF/Al cathode. Fullerene (C60) and rhodamine B (RhB) molecules were used as thenanosutructured ultrathin layers inserted at the interface between the Alq3 and TPD layers. The electroluminescent (EL) propertieshave been measured for the OLEDs with C60 and RhB ultrathin layers and the dependences on the thickness and the position of theinserted layers were examined. For the OLEDs with the C60 ultrathin layer, the improvements of the drive voltage and EL eciencywere observed. The OLED with the inserted C60 ultrathin lm of a monolayer thickness showed the highest eciency, which wastwice as large as that without C60 layer. On the contrary, the improvements were not observed for the OLEDs with the RhB ul-trathin layer..
Murata, Keizo,Fukumoto, Yuhei,Yokogawa, Keiichi,Kang, Woun,Takaoka, Ryo,Tada, Ryota,Hirayama, H.,Brooks, James S.,Graf, David,Yoshino, Harukazu,Sasaki, Takahiko,Kato, Reizo Elsevier 2015 PHYSICA B-CONDENSED MATTER - Vol.460 No.-
<P><B>Abstract</B></P> <P>We have studied the angular dependence of magnetoresistance and Hall effect of the CDW organic conductor, HMTSF–TCNQ in order to see whether a magnetic-field-induced phase exists in the charge density wave (CDW) system, similarly to the magnetic-field-induced SDW phases in (TMTSF)<SUB>2</SUB>X. The anomaly in magnetoresistance was observed only around the pressure where the CDW is almost suppressed, i.e. around 0.8–1.1GPa, but neither at low pressures (0 and 0.5GPa) nor at high pressure above 2GPa. This behavior is quite similar to that of (TMTSF)<SUB>2</SUB>X. At 1.1GPa anomalies were found at fields of 0.2T and 10T. We speculate that at 1.1GPa the field-induced phase is located between 0.2T and 10T, where 1D Fermi surface sheet and 2D Fermi-surface pocket are present. The <I>R</I> <SUB> <I>xy</I> </SUB> shows plateau structure and <I>R</I> <SUB> <I>xx</I> </SUB> was very small in the same region, suggestive of quantum Hall effect.</P>
Luminescence and photoelectric properties of thiophene dendrimer spin-coated films
Kazunari Shinbo,Yoshifumi Ikeda,Chuanjun Xia,Keizo Kato,Futao Kaneko,Rigoberto C. Advincula 한국물리학회 2005 Current Applied Physics Vol.5 No.4
Thiophene dendrimer spin-coated lms were fabricated and the optical and photoelectric properties were investigated.Absorption edge and peak of photoluminescence (PL) spectra for the lm were observed at around 550 and 618 nm, respectively.The excitation spectrum almost corresponded with optical absorption. From the voltage vs. current properties, the Schottkyconductions were estimated in the indium tin oxide (ITO)/dendrimer/Al device. Photoelectric properties were also observed and theaction spectra of the photocurrent in the device also corresponded with the absorption spectrum..