| Co-Investigator(Kenkyū-buntansha) |
SUNAGAWA Takeyoshi Fukui University of Technology, Faculty of Engineering, Associate Professor, 工学部, 准教授 (60329456)
HARA Michihiro Fukui University of Technology, Faculty of Engineering, Associate Professor, 工学部, 講師 (80362630)
UMEDA Takao Fukui University of Technology, Faculty of Engineering, Research Associate, 工学部, 実習助手 (00440537)
NAKANO Hideyuki Osaka University, Graduate School of Engineering, Associate Professor, 大学院工学研究科, 講師 (00222167)
KAGEYAMA Hiroshi Osaka University, Graduate School of Engineering, Associate Professor, 大学院工学研究科, 講師 (50294038)
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| Research Abstract |
We have performed studies on 1) organic photovoltaic devices, 2) organic electroluminescent (EL) devise, and 3) creation of photochromic amorphous molecular materials and their application for photoinduced surface relief grating (SRG) formation.
1) Studies on organic photovoltaic devise. We have fabricated new organic photovoltaic devices based on pn-heterojunction using titanyl phthalocyanine (TiOPc) as a p-type organic semiconductor and a perylene pigment, anthra [2", 1",9":4,5,6:6"5" 10":4',5',6']idiisoquino[2, 1-a:2",1-A']dibenzimidazole-10,21-dione (PV), as an n-type organic semiconductor and investigated the performance of devices. As compared with corresponding devices using copper phthalocyanine, the devices using TiOPc were found to exhibit lower fill factor, resulting in lower conversion efficiencies. Exposure of TiOPc-based cells to Et0H vapor caused the morphological change of TiOPcfrom the amorphous phase to the α-crystalline phase, expanding its photosensitivity to a near
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infrared (IR) region. Thus, near-IR sensitive organic photovoltaic devices were developed by the EtOH treatment of the devices with as-deposited, amorphous TiOPc.
2) Studies on organic EL devices. The use of iodine-doped 4,4',4"-tris[3-methylphenyl(phenyl)aminotriphenylamine] (m-MTDATA) as a hole-injection buffer layer in tris(8-quinolinolato)aluminum (Alq3)-based organic EL devices led to the reduction of drive voltage and the enhancement of external quantum efficiency as compared with the corresponding devices using undoped m-MTDATA. It was indicated that increasing the electrical conductivity of the hole-transport layer is one of the effective methods for enhancing not only hole injection from the anode but also electron injection from the cathode, resulting in the better charge balance and hence the higher performance of organic EL devices. Prevention of exciplex formation in organic EL devices was studied to obtain efficient blue emission. A near-IR-emitting organic EL device was also developed.
3) Creation of photochromic amorphous molecular materials and their application for SRG formation. A family of azobenzene-based photochromic amorphous molecular materials was created. It was found that the modulation depths of SRGs become larger with the increasing glass-transition temperatures of azobenzene-based photochromic amorphous molecular materials. The methods of the preparation of organic thin films, vacuum deposition and spin coating from solution, were found to exert strong influence on the thermal backward reaction from the cis-form to the trans-form as amorphous film. Less
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