Ube Industries, Inc.

Hisayoshi Iba

Shinichi Ishitobi

Yasuyuki Ichizono

Koichi Fukuda

Takafumi Kawano

Hideki Ohtsubo

Shin-Ichi Sakata

Norifumi Miyamoto

A ceramic composite for light conversion, which can make the fluorescence dominant wavelength longer up to 580 nm, further arbitrarily adjust the wavelength in the range of 570 to 580 nm, and undergoes no decrease in fluorescence intensity even when the fluorescence dominant wavelength is made longer, with luminescence unevenness suppressed. A light-emitting device comprising ceramic composite mentioned above. The ceramic composite for light conversion is a solidified body including a composition expressed by the following formula (1), where the composition has a structure where at least two oxide phases of a first phase and a second phase are continuously and three-dimensionally entangled mutually, and the ceramic composite for light conversion is characterized in that the first phase is a (Tb, Y)AlOphase activated with Ce for producing fluorescence, whereas the second phase is an AlOphase.

Ceramic composite for light conversion and light-emitting device using same

A ceramic composite for light conversion, and method of producing same and a light emitting device including the same. The ceramic composite for light conversion of the present invention is a solidified body having a structure in which at least two oxide phases including a first phase and a second phase are continuously and three-dimensionally intertwined with one another, and characterized in that the first phase is a YAlOphase including Ba or Sr and activated with fluorescent Ce, the second phase is an AlOphase, and the Sr or Ba in the solidified body are contained in an amount of 0.01 to 1.00 part by mass based on 100 parts by mass of the solidified body, in terms of the oxide.

Ceramic composite for light conversion

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 dielectric ceramic composition which can be sintered at such a temperature of about 800 to 1000&#xb0; C. as to permit incorporation of and multilayer formation with a low resistant conductor such as Ag or Cu by the simultaneous sintering with the low resistant conductor, which is sintered to form dielectric ceramics having a dielectric constant &#x3b5;of not more than 10, and a resonator having a large Q&#xd7;fvalue and an absolute value in temperature coefficient &#x3c4;of resonance frequency fof not more than 20 ppm/&#xb0; C., the value being easy to be controlled. The dielectric ceramic composition contains a glass component in an amount of 5 to 150 parts by weight based on 100 parts by weight of a main component represented by general formula: aZnAlO-bZnSiO-cTiO-dZnTiO, in which the molar fractions of respective components a, b, c, and d satisfy 5.0&#x2266;a&#x2266;80.0 mol % 5.0&#x2266;b&#x2266;70.0 mol %, 5.0&#x2266;c&#x2266;27.5 mol %, 0&#x2266;d&#x2266;30.0 mol % (a+b+c+d=100 mol %) The main component may also be represented by aMgSiO-bZnAlO-cSiO-dCaTiO-eZnSiO.

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Ube, Japan

Hisayoshi Iba