Advanced Material Chemistry Course Prof. Takanori WATARI E-mail:watarit [at] cc.saga-u.ac.jp (Please replace [at] with @ in e-mail address.) Academic Staff Database

Education: 1979 Kyushu Univ., Faculty of Engineering, Graduated 1980 Kyushu Univ., Graduate School, Division of Engineering, Master Course, Unfinished course Employment Experience: 1986-1990 Saga Univ., Faculty of Science and Engineering, Lecturer 1989-1990 Univ. of Nevada - Reno, Researcher 1990-2000 Saga Univ., Faculty of Science and Engineering, Associate Professor 2000-2010 Saga Univ., Faculty of Science and Engineering, Professor 2005- Saga Univ., Institute of Ocean Energy, Professor 2007-2009 Saga Univ., Admission Center, Professor 2009-2010 Saga Univ., Center for Research and Development of Higher Education, Professor 2010- Saga Univ., Graduate School of Science and Engineering�@Advanced Technology Fusion, Professor

Research Field : Inorganic material/physical properties

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Fabrication and Characterization of Up-Conversion Phosphor

There are two types in the Phosphor material, one is �gDown-Conversion(DC)�h and the other is �gUp-Conversion(UC)�h. DC phosphor absorbs the UV light and emits the visible light. UC phosphor absorbs the IR light and emits the visible light. In the laboratory, cheap and harmless ceramic phosphors are investigated. So far we have found the ZnO-TiO2 ceramics with rare earth metals show superior emission characteristics, bright red and green color, as shown in Figure 1. At present time, we investigate the improvement of the emission characteristics and the emission mechanism.
Fig.1 UC emission in ZnO-TiO2 phosphors.

Development in new decoration methods for ceramic ware

Saga prefecture is famous for the Arita porcelain and Karatsu pottery. In laboratory, the new decoration methods of the glass covered on ceramic wares are investigated. We try to glow the crystal, whose position and shape are controlled (Fig.2(a)). Also, The DC phosphor crystals are tried to be grown in the glass (Fig.2(b)).
Fig.2 Grown crystal in glass and DC emission.