Kabushiki Kaisha Toshiba

Kanagawa Institute of Industrial Science and Technology

Yokohama National University

Denka Company Limited

Yokohama Tlo Company, Ltd.

Junichi Tatami

Katsutoshi Komeya

Toru Wakihara

Yumi Fukuda

Masaaki Tamatani

Ryosuke Hiramatsu

Hironori Asai

Takuma Takahashi

Masahiro Yokouchi

Hideki Hirotsuru

Emi Takahashi

Koki Ikarashi

Ippei Kokubun

Takeshi Meguro

Tomofumi Katashima

Yuki Sano

Nanako Sugimoto

Takehiko Tanaka

Midori Sotokawa

A fluorescent member according to present invention is composed of a sintered body for wavelength conversion containing a matrix containing magnesium oxide and magnesium hydroxide as main components, and phosphor particles dispersed in the matrix. A thermal conductivity of the fluorescent member is preferably 5 W/(m&#xb7;K) or higher. A fluorescent member having both a satisfactory thermal conductivity and a satisfactory fluorescent property is provided without requiring a high-temperature sintering process (a high-temperature process at a temperature higher than 250&#xb0; C.). Further, a method for manufacturing such a fluorescent member and a light-emitting apparatus using such a fluorescent member are provided.

Fluorescent member, its manufacturing method, and light-emitting apparatus

Provided are a transparent fluorescent sialon ceramic having fluorescence and optical transparency; and a method of producing the same. Such a transparent fluorescent sialon ceramic includes a sialon phosphor which contains a matrix formed of a silicon nitride compound represented by the formula M(Si,Al)(N,O)(here, M represents at least one selected from the group consisting of Li, alkaline earth metals, and rare earth metals, 0&#x2264;x/z&#x3c;3, and 0&#x3c;y/z&#x3c;1) and a luminescent center element.

Transparent fluorescent sialon ceramic and method of producing same

A nitride phosphor particle dispersion-type sialon ceramic of the present invention includes a matrix formed of a sialon-based compound; and at least one nitride phosphor which is dispersed in the matrix and contains a luminescence center element.

Nitride phosphor particle dispersion-type sialon ceramic, fluorescent member, and method for producing nitride phosphor particle dispersion-type sialon ceramic

A production process for a crystal oriented ceramics includes: a first step of preparing composite particles formed of particles having magnetic anisotropy having magnetic susceptibility anisotropy and seed particles having magnetic susceptibility anisotropy less than or equal to 1/10 of the magnetic susceptibility anisotropy of the particles having magnetic anisotropy and are formed of an inorganic compound having an anisotropic shape in which a crystal axis intended to be corresponds to a minor axis or a major axis; a second step of adding raw material powder including the composite particles to a solvent to prepare a slurry a third step of preparing a green compact by disposing the slurry in a static magnetic field of &#x2265;0.1 tesla and drying the slurry in a state in which crystal axes of the seed particles in a major axis direction are in one direction; and a fourth step of sintering the green compact.

Crystal oriented ceramicscrystal oriented ceramics, the production process, and heat radiation material

There is provided a method for producing hexagonal boron nitride, including a heating step of heating a mixture containing boron carbide and an alkaline earth metal compound under an ammonia atmosphere at 1300-1500&#xb0; C. to obtain a product containing hexagonal boron nitride, wherein a molar ratio of the boron carbide to the alkaline earth metal compound in the mixture is 0.5-2.0.

Method for producing hexagonal boron nitride, and heat dissipation sheet

A luminescent material which is featured in that it exhibits an emission peak at a wavelength ranging from 490 to 580 nm as it is excited by light having a wavelength ranging from 250 to 500 nm and that it has a composition represented by the following general formula (2):(MR)AlSiON&#x2003;&#x2003;(2) (In the general formula (2), M is at least one metallic element excluding Si and Al, R is a luminescence center element, and x, a2, b2, c2 and d2 satisfy the following relationships:

Luminescent material and light-emitting device

A luminescent material which is featured in that it exhibits an emission peak at a wavelength ranging from 490 to 580 nm as it is excited by light having a wavelength ranging from 250 to 500 nm and that it has a composition represented by the following general formula (2):(MR)AlSiON&#x2003;&#x2003;(2) (In the general formula (2), M is at least one metallic element excluding Si and Al, R is a luminescence center element, and x, a2, b2, c2 and d2 satisfy the following relationships:0&#x3c;x&#x2266;1, 0.93&#x3c;a2&#x3c;1.3, 4.0&#x3c;b2&#x3c;5.80.6&#x3c;c2&#x3c;1, 6&#x3c;d2&#x3c;11).

To provide a sintered silicon nitride with conductivity and densification, an oxide of titanium group elements, such as titanium oxide, hafnium oxide, zirconium oxide and the like, aluminum oxide and/or aluminum nitride is added as needed to silicon nitride-oxidant of rare-earth elements-aluminum oxide system or silicon nitride-oxide of rare-earth elements-magnesia system, and then specified quantity of carbon nonotube (CNT) is added to the above mixture. CNT generates silicon carbide after the reaction with contiguous or proximal silicon nitride and the like depending on the sintering duration at high temperature. Since silicon carbide is generated along with nanotubes, the silicon carbide functions as conductor with excellent heat resistance, corrosion resistance and the like.

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Yokohama, Japan

Junichi Tatami