Ube Industries, Inc.

Ube Electronics, Ltd.

Masataka Fujinaga

Shinsuke Jida

Takuma Sakai

Takayuki Ueda

Kazuki Iwashita

Mao Sumino

Koichi Fukuda

Kyoji Ohdan

Masahide Kondo

Takeshi Yamao

Takafumi Kawano

Kosuke Nishimura

Atsuyuki Mitani

Toshihiko Hogami

Shinichi Ishitobi

Yoshiaki Fujiyama

Masataka Yamanaga

Koji Shibata

Michio Honda

Takayuki Fujii

Yuki Nagao

Takuji Ohmaru

Hiroshi Nakamura

Masatoshi Takeda

An oxynitride phosphor powder has a fluorescence peak wavelength of 587 to 630 nm and a high external quantum efficiency. A method of producing the oxynitride phosphor powder containing Li at 50 to 10,000 ppm includes mixing silicon nitride powder, a substance serving as an aluminum source, a substance serving as a calcium source and a substance serving as an europium source; firing the mixture at 1500 to 2000&#xb0; C. in an inert gas atmosphere or a reducing gas atmosphere to obtain a fired oxynitride phosphor composed mainly of Ca-containing &#x3b1;-SiAlON, as an intermediate; and heat treating the fired oxynitride phosphor at a temperature of 1450&#xb0; C. to less than the firing temperature, in an inert gas atmosphere or in a reducing gas atmosphere in the presence of Li.

Oxynitride phosphor powder and method for producing same

An (oxy)nitride phosphor powder has a fluorescence peak wavelength of 610 to 625 nm and also has higher external quantum efficiency than the conventional one. The (oxy)nitride phosphor powder includes an &#x3b1;-type SiAlON and aluminum nitride, represented by the compositional formula: CaEuSiAlONwherein x1, x2, y, z fulfill the following formulae: 1.60&#x2266;x1+x2&#x2266;2.90, 0.18&#x2266;x2/x1&#x2266;0.70, 4.0&#x2266;y&#x2266;6.5, 0.0&#x2266;z&#x2266;1.0. The powder can additionally contain Li in an amount of 50 to 10000 ppm. The content of the aluminum nitride may be more than 0 mass % to less than 33 mass %.

(Oxy)nitride phosphor powder and method of producing same

An oxynitride phosphor powder is an &#x3b1;-SiAlON phosphor having a dominant wavelength of 565-577 nm and fluorescence intensity and external quantum efficiency that are high enough for practical use. The oxynitride phosphor powder comprises an &#x3b1;-SiAlON represented by the compositional formula: CaEuYbSiAlON(wherein 0.0&#x3c;x1&#x2266;2.0, 0.0000&#x3c;x2&#x2266;0.0100, 0.0000&#x3c;x3&#x2266;0.0100, 0.4&#x2266;x2/x3&#x2266;1.4, 1.0&#x2266;y&#x2266;4.0, 0.5&#x2266;z&#x2266;2.0).

Oxynitride phosphor powder

An oxynitride phosphor powder contains &#x3b1;-SiAlON and aluminum nitride, obtained by mixing a silicon source, an aluminum source, a calcium source, and a europium source to produce a composition represented by a compositional formula: CaEuSiAlON(wherein x1, x2, y and z are 0&#x3c;x1&#x2266;3.40, 0.05&#x2266;x2&#x2266;0.20, 4.0&#x2266;y&#x2266;7.0, and 0&#x2266;z&#x2266;1), and firing the mixture.

Oxynitride phosphor powder, silicon nitride powder for production of oxynitride phosphor powder, and production method of oxynitride phosphor powder

A method of manufacturing a wavelength conversion member including a polycrystalline ceramics includes mixing a substance serving as a silicon source, a substance serving as an aluminum source, a substance serving as a calcium source, and a substance serving as a europium source; firing the obtained mixture to obtain an oxynitride phosphor powder; then sintering the oxynitride phosphor powder in an inert atmosphere to obtain the polycrystalline ceramics, characterized in that the sintered oxynitride phosphor powder has a composition (excluding oxygen) represented by the Formula: CaEuSiAlON(in the Formula, x1, x2, y, and z are values such that 0&#x3c;x1&#x2266;3.40, 0.05&#x2266;x2&#x2266;0.20, 3.5&#x2266;y&#x2266;7.0, 0&#x2266;z&#x2266;1).

Wavelength conversion member and light-emitting device employing same

An oxynitride phosphor power has a fluorescence peak wavelength of 580 to 605 nm, the oxynitride phosphor having a higher external quantum efficiency than ever before. The oxynitride phosphor powder is an oxynitride phosphor powder containing &#x3b1;-SiAlON and aluminum nitride, represented by composition formula:CaEuSiAlONwherein x1, x2, y and z are 0&#x3c;x1&#x2266;2.50, 0.01&#x2266;x2&#x2266;0.20, 0&#x3c;y&#x2266;2.3 and 1.5&#x2266;z&#x2266;3.5, or x1, x2, y and z are 0&#x3c;x1&#x2266;2.70, 0.05&#x2266;x2&#x2266;0.20, 2.3&#x2266;y&#x2266;5.5 and 1&#x2266;z&#x2266;2.5.

A method of producing a silicon nitride powder includes heating an amorphous Si&#x2014;N(&#x2014;H)-based compound in which assuming that the specific surface area is RS (m/g) and the oxygen content ratio is RO (mass %), RS/RO is 500 or more, at a temperature rising rate of 12 to 100&#xb0; C./min in a temperature range from 1,000 to 1,400&#xb0; C. while flowing the compound by a continuous firing furnace.

Silicon nitride powder production method, silicon nitride powder, silicon nitride sintered body and circuit substrate using same

Provided are a crystalline silicon nitride powder for a siliconitride phosphors, which is used as a starting material for producing a siliconitride phosphor containing a silicon element and a nitrogen element but no oxygen element as a constitutent element, an oxygen content of the silicon nitride phosphor being 0.2-0.8 wt %; a CaAlSiNphosphor, an SrSiNphosphor, an (Sr, Ca)AlSiNphosphor and an LaSiNphosphor, each using the silicon nitride powder; and a method for producing the phosphors.

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Provided is a silicon nitride powder for siliconitride phosphor having high luminance, a SrAlSiONphosphor and a &#x3b2;-Sialon phosphor using the powder, which can be used for vacuum fluorescent displays (VFDs), field emission displays (FEDs), plasma display panels (PDPs), cathode ray tubes (CRTs), light emitting diodes (LEDs), or the like, and processes for producing these phosphors. The silicon nitride powder for the siliconitride phosphors is a crystalline silicon nitride powder for use as a raw material for producing siliconitride phosphors including a silicon element, a nitrogen element, and an oxygen element, and has an average particle diameter of 1.0 to 12 &#x3bc;m and an oxygen content of 0.2 to 0.9% by weight.

A method for producing an &#x3b1;-sialon-based oxynitride phosphor includes a mixed powder blended such that the product is represented by the formula: MSiAlON:Ln(wherein M is at least one metal selected from Li, Ca, Mg, Y and a lanthanide metal excluding La and Ce, Ln is at least one lanthanide metal selected from Eu, Dy, Er, Tb and Yb), the mixed powder containing an amorphous silicon nitride powder having an loose bulk density of 0.16 to 0.22 g/cm, and is fired at 1,400 to 2,000&#xb0; C. in a nitrogen-containing inert gas atmosphere.

Production method of sialon-based oxynitride phosphor, and sialon-based oxynitride phosphor

In a dielectric filter () for base station communication equipment, a rectangular solid dielectric block () is provided with a plurality of &#xbc; wavelength resonators (A-AB-B), which are arranged along side planes () of the dielectric block and extend in parallel to each other and to the side planes (). The dielectric block () is composed of dielectric ceramics having a relative dielectric constant of 5-20, and a size (H) in a direction orthogonally intersecting with the side planes () of the dielectric block () is 10-30 mm.

Dielectric filter for base station communication equipment

A band-pass filter has a ladder-type circuit including first and second terminals whose characteristic impedances are Z, and series elements and shunt elements disposed between a first terminal and a second terminal, each of the series elements and shunt elements containing a film bulk acoustic resonator. Assuming that characteristic impedance of any one of the series elements is Zand that characteristic impedance of any one of the shunt elements is Z, the characteristic impedances Z, Z, and Zhave a relation of 1&#x3c;(Z/Z)&#x3c;2, preferably 1.3&#x3c;(Z/Z)&#x3c;1.7, and 0.5&#x3c;(Z/Z)&#x3c;1, preferably 0.6&#x3c;(Z/Z)&#x3c;0.8.

Band-pass filter using film bulk acoustic resonator

Dielectric ceramic composition

A dielectric ceramic composition mainly comprises a major component which comprises barium, titanium, neodymium, samarium and oxygen and is represented by the following compositional formula:

A heteropolyacid type catalyst capable of producing methacrylic acid from methacrolein and molecular oxygen at an extremely high yield for a long time at a relatively low temperature for a short contacting time under a vapor phase is provided. This catalyst is prepared by:

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Ube, Japan

Masataka Fujinaga