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Hideyuki Murata Professor
School of Materials Science（Department of Materials Science・Materials Characterization and Device）
■Degrees
B.E (1987) from Saga University, M. E (1989) and Ph. D (1992) from Kyushu University, Japan
■Professional Career
Research Chemist at Mitsui Petrochemical Industries Ltd.Japan (1992)
Research Contractor at the Optical Sciences Division, US Naval Research Laboratory, USA (1996)
Senior Lecturer in the Department of Chemistry, Imperial College London, University of London, UK (2001)
Research Chemist, PRESTO, Japan Science and Technology Corporation (2002)
Part-time Lecturer, Garduate School of Engineering, Kyoto University (2003)
■Specialties
Organic Optoelectronic Devices, Molecular Devices, Growth Control of Molecular and Polymer Thin Films
■Research Interests
Novel conjugated polymer and its thin film growth by vapour phase deposition.
Novel electron transporting polymers (polyoxadiazoles) were developed and film deposition was achieved using vapour deposition of monomers. This unique technique allows large-area uniform thin film growth with very few defects. My group was the first to successfully fabricate multilayer polymer LEDs by vapour phase deposition.
Material development for organic electronics.
We have reported that a novel electron transport material, silole derivative, exhibit very high electron mobility even in an air. We have found that silole derivatives show very high photoluminescence quantum yield of close to unity. The OLED using these compounds as an electron transport layer and an emitting layer showed the efficiency close to the theoretical limit for a device using fluorescent emitter.
We have investigated mechanisms for enhancing efficiency and stability of the devices by doping of fluorescent dyes. Followings are selected topics for our recent work on OLEDs using guest-host active layer:
1. Direct carrier recombination on guest molecule in guest-host active layer.
2. The role of host material in PL quantum yield and EL quantum efficiency based upon energy transfer mechanism.
3. Temperature-independent EL quantum efficiency due to doping of fluorescent dye.
4. Significant improvement of device durability due to doping of fluorescent dyes.
■Publications
◇Books
- 『有機薄膜形成とデバイス応用展開』 第2章4節，
板橋敦 村田英幸，CMC出版，2007，42-53
◇Published Papers
- Independent control of open-circuit voltage of organic solar cells by changing film thickness of MoO3 buffer layer，Yoshiki Kinoshita, Rie Takenaka, and Hideyuki Murata，
Appl. Phys. Lett.,，92，243309，(2008) - Enhancing power conversion efficiencies and operational stability of organic light-emitting diodes by increasing carrier injection efficiencies at anode/organic and organic/organic heterojunction interfaces，Toshinori Matsushima and Hideyuki Murata，
J. Appl. Phys.，104，034507-1-034507-4，(2008) - Photoluminescence and Electroluminescence Characteristics of [7,7'-Biindolizine]-1,1',2, 2'-tetracarboxylic Acid,3,3'-Dicyano-1,2-diethyl Ester, 1',2'-Dimethyl Est，Toshinori Matsushima, Ryosuke Kimura, Masahiro Asahara and Hideyuki Murata，37，12，1260-1261，2008
◇Lectures and Presentations
- Degradation Mechanisms of OLED Materials (Invited)，H. Murata，7th International Conference on Electroluminescence of Molecular Materials and Related Phenomena，(Dresden, Germany)，2008/09/02
- (Invited)Achieving excellent stability in organic light-emitting devices，
H. Murata，The 10th Asia Pacific Physics Conference，Pohang, Korea，2007/8/20-22 - (Invited)"Intrinsic degradation mechanism of organic light-emitting devices fabricated under ultra-high vacuum condition"，
H. Murata，SPIE Optics & Photonics，San Diego, CA, USA，2007/8/26-31
■Extramural Activities
◇Academic Society Affiliations
- The Society of Polymer Science, Japan，Organizing Committee，2008-
- Society for Information Display，Member，2008-
- American Chemical Society，member，2008-
◇Other Activities
- OLED Forum Japan，Chair of Organizing Committee，2008/06/13 - 2008/06/14
- SPIE Optics & Photonics (San Diego CA USA)，Program Committee，2008/08/12 - 2008/08/14
- The 15th International Display Workshops (IDW '08)Niigata, Japan，Program Committee，2008/12/03 - 2008/12/05