Ayano Toda
Niigata University
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Publication
Featured researches published by Ayano Toda.
New Journal of Chemistry | 2017
Sun-woog Kim; Takuya Hasegawa; Masaru Muto; Ayano Toda; Tatsuro Kaneko; Kazuma Sugimoto; Kazuyoshi Uematsu; Tadashi Ishigaki; Kenji Toda; Mineo Sato; J. Koide; M. Toda; Y. Kudo
Greenish-white emitting Rb1−xErxVO3 (0 ≤ x ≤ 0.10) phosphors were synthesized by a conventional solid state reaction method. The thermal quenching effect of the RbVO3 phosphors was effectively improved by Er3+ doping into the RbVO3 lattice. Consequently, the emission peak intensity of the phosphors was successfully enhanced by Er3+ doping, and the internal quantum efficiency of Rb0.99Er0.01VO3 under excitation at 360 nm was 80%.
Key Engineering Materials | 2016
Kenji Toda; Sun Woog Kim; Takuya Hasegawa; Mizuki Watanabe; Tatsuro Kaneko; Ayano Toda; Atsushi Itadani; Mineo Sato; Kazuyoshi Uematsu; Tadashi Ishigaki; Junko Koide; Masako Toda; Yoshiaki Kudo; Takaki Masaki; Dae Ho Yoon
We report novel soft chemical synthesis method, solid hydratethermal reaction (SHR) method as a new soft chemistry. This method is very simple and can synthesize the ceramic materials just by storing the mixture of raw materials added a small amount of water in a reactor at low temperature below 373 K. For example, nanosize YVO4 (under 100 nm in diameter) was obtained using the SHR method.
Applied Spectroscopy Reviews | 2018
Sun Woog Kim; Takuya Hasegawa; Mizuki Watanabe; Masaru Muto; Toshiya Terashima; Yusuke Abe; Tatsuro Kaneko; Ayano Toda; Tadashi Ishigaki; Kazuyoshi Uematsu; Kenji Toda; Mineo Sato; Emiko Kawakami; Junko Koide; Masako Toda; Yoshiaki Kudo; Takaki Masaki; Dae Ho Yoon
ABSTRACT Ceramic materials have been widely used in various applications and are significantly important in our daily life. The various methods for synthesizing ceramics powder materials have been already reported, and the synthesis method is known to considerably affect the characteristics and particle morphology of ceramic powder materials. We have recently developed a novel soft chemical synthesis method, named water-assisted solid-state reaction (WASSR) method, which can be synthesized at low temperatures below 100°C. We further demonstrated the effect and availability of this method on the synthesis process for ceramic oxide materials. In this paper, we review some results for the nanophosphors synthesized by the WASSR method and discuss the reaction mechanism of this method.
Key Engineering Materials | 2017
Kenji Toda; Sun Woog Kim; Takuya Hasegawa; Mizuki Watanabe; Tatsuro Kaneko; Ayano Toda; Ryota Yamanashi; Shota Kumagai; Masaru Muto; Atsushi Itadani; Mineo Sato; Kazuyoshi Uematsu; Tadashi Ishigaki; Junko Koide; Masako Toda; Emiko Kawakami; Yoshiaki Kudo; Takaki Masaki; Dae Ho Yoon
We report a novel soft chemical synthesis method, water assisted solid state reaction (WASSR) method. This method is very simple and can synthesize many ceramic materials just by storing or mixing raw materials added a small amount of water in a reactor at low temperature below 373 K. For example, well-crystalline SrMoO4 was obtained using the WASSR method.
Key Engineering Materials | 2010
Ayano Toda; Kazuyoshi Uematu; Tadashi Ishigaki; Kenji Toda; Mineo Sato
Ba2Gd3Li3Mo8O32:Eu3+ phosphor was prepared using a single mode microwave oven operated at a frequency of 2.45 GHz and a power of 500 W. The temperature of raw materials, mixtures of BaCO3, Gd2O3, Li2CO3, MoO3 and Eu2O3 subjected to microwave irradiation increased to about 1073 K in 120 s, followed by a sharp drop despite irradiating the raw materials continuously. By measuring the dielectric loss factor of the raw materials at 2.45 GHz, the temperature increased could be attributed to the fact that MoO3 absorbs a high proportion of microwave energy. In the case of the microwave heating method, the phosphor particles were highly non-aggregated.
Key Engineering Materials | 2009
Ayano Toda; Kenji Toda; Tadashi Ishigaki; Kazuyuki Uematsu; Mineo Sato
Eu3+ doped and undoped Y(P,V)O4 phosphors were prepared using multi-mode and single-mode microwave oven operated at 2.45 GHz. In the case of the microwave heating method, the phosphor particles were non-aggregated. A homogeneous distribution of Eu ion was observed in the microwave synthesis. No sintering behavior found in the microwave heating may be attributed to a quite shorter heating time. The Eu3+ doped sample synthesized by microwave heating showed intense red emission under UV excitation.
Science of Advanced Materials | 2015
Tatsuro Kaneko; Sun Woog Kim; Ayano Toda; Kazuyoshi Uematsu; Tadashi Ishigaki; Kenji Toda; Mineo Sato; Junko Koide; Masako Toda; Yoshiaki Kudo; Takaki Masaki; Dea Ho Yoon
Materials Science and Engineering B-advanced Functional Solid-state Materials | 2010
Ayano Toda; Kazuyoshi Uematsu; Tadashi Ishigaki; Kenji Toda; Mineo Sato
Science of Advanced Materials | 2017
Sun Woog Kim; Kenji Toda; Takuya Hasegawa; Mizuki Watanabe; Tatsuro Kaneko; Ayano Toda; Atsushi Itadani; Mineo Sato; Kazuyoshi Uematsu; Tadashi Ishigaki; Junko Koide; Masako Toda; Yoshiaki Kudo; Takaki Masaki; Dae Ho Yoon
Journal of The Ceramic Society of Japan | 2017
Mizuki Watanabe; Jun Inoi; Sun Woog Kim; Tatsuro Kaneko; Ayano Toda; Mineo Sato; Kazuyoshi Uematsu; Kenji Toda; Junko Koide; Masako Toda; Emiko Kawakami; Yoshiaki Kudo; Takaki Masaki; Dae Ho Yoon