Ube Industries, Inc.

Shin-Ichi Sakata

Tetsuo Yamada

Yoshiharu Waku

Takeshi Yamao

Takuma Sakai

Atsuyuki Mitani

Hideki Ohtsubo

Hiroshi Fujino

Shinichi Ishitobi

Hiroshi Oda

Hisayoshi Iba

Yasuyuki Ichizono

Norifumi Miyamoto

Fumito Furuuchi

Provided are a ceramic composite for light conversion, which is capable of maintaining a high radiant flux even when the proportion of Gd and Ce is increased to tune the fluorescence peak wavelength to the longer wavelength side, a process for producing the ceramic composite, and a light emitting device including the ceramic composite. The ceramic composite for light conversion is a solidification product including a composition that is represented by a specific formula, and has a texture of continuously and three-dimensionally mutually entangled oxide phases including at least two phases of a first phase and a second phase, characterized in that the first phase is a YAlOfluorescent phase activated with Ce, and the second phase is an AlOphase, and the first phase and second phase account for 97% by area or more of a cross section of the solidification product, or characterized in that the first phase is a YAlOfluorescent phase activated with Gd and Ce, and the second phase is an AlOphase, and the first phase and second phase account for 97% by area or more of a cross section of the solidification product.

Ceramic composite for light conversion, process for production thereof, and light-emitting devices provided with same

A practical novel phosphor material composed of an &#x3b1;-type silicon nitride, i.e., an &#x3b1;-type silicon nitride phosphor containing a fluorescence-emittable element throughout an &#x3b1;-type silicon nitride particle from the surface to the inside, is provided. Portions having a high emittable element concentration are preferably present like islands, and the fluorescence-emittable element is preferably a lanthanide metal. A powder composed of a fluorescence-emittable element is added to silicon diimide (Si(NH)) or an amorphous silicon nitride powder obtained by thermally decomposing silicon diimide (Si(NH)), the powders are mixed, and the mixture is fired in a non-oxidizing atmosphere, whereby the phosphor material is obtained.

&#x3b1;-type silicon nitride phosphor and production method thereof

A &#x3b2;-sialon phosphor particle in which Eu (europium) is solid-soluted in a crystal having a &#x3b2;-type SiNcrystal structure, wherein the median diameter (D) in the particle size distribution curve of the primary particle is from 3.0 to 10 &#x3bc;m and the aspect ratio is less than 1.5.

&#x3b2;-sialon phosphor powder and production method thereof

A method ensuring that a CaMgSiO:Eublue light-emitting phosphor having high emission intensity can be produced in an industrially advantageous manner is provided. The production method includes a step of mixing a calcium source powder, a europium source powder, a magnesium source powder and a silicon source powder composed of silicon diimide powder or the like in a ratio producing a CaMgSiO:Eublue light-emitting phosphor, and a step of subjecting the powder mixture to heating at a temperature of 400 to 1,000&#xb0; C. in an oxygen-containing gas atmosphere and then firing at a temperature of 800 to 1,500&#xb0; C. in a reducing gas atmosphere.

Production method of blue light-emitting phosphor

A light-converting ceramic composite comprising a solidified body having a texture of at least two or more oxide phases being continuously and three-dimensionally entangled together, with at least one of the oxide phases being a fluorescence-emitting crystal phase, wherein the interface length between the oxide phases per 1 mmof a plane in the light-converting ceramic composite is from 150 to 1,500 mm.

Ceramic composite for phototransformation and light emitting device using the same

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Yamaguchi, Japan

Shin-Ichi Sakata