Ube Industries, Inc.

Shin-ichi Sakata

Tetsuo Yamada

Atsuyuki Mitani

Takeshi Yamao

Itsuhiro Fujii

Yoshiharu Waku

Hiroshi Fujino

Hiroshi Oda

A ceramic composite material for light conversion, which is a solidified body comprising two or more matrix phases with respective components being two or more oxides selected from the group consisting of metal oxides and complex oxides each produced from two or more metal oxides, wherein at least one of the matrix phases is a phosphor phase containing an activated oxide. The solidified body is preferably obtained by the unidirectional solidification method. The ceramic composite material for light conversion is excellent in brightness, light-mixing property, heat resistance and ultraviolet light resistance.

Ceramic composite material for light conversion and use thereof

An oxynitride phosphor includes an &#x3b1;-sialon as the main component, which is represented by the formula: MSiAlON:Ln(wherein 0.3&#x2266;x+y&#x3c;1.5, 0&#x3c;y&#x3c;0.7, 0.3&#x2266;m&#x3c;4.5, 0&#x3c;n&#x3c;2.25, and assuming that the atomic valence of the metal M is a and the atomic valence of the lanthanide metal Ln is b, m=ax+by) and in which the aggregation index, A=D/D&#x2266;3.0 or the aggregation index A=D/D&#x2266;3.0; and a production method and usage of the phosphor.

Sialon-based oxynitride phosphor and production method thereof

The present invention relates to a ceramic composite light-converting member which is a solidified body having a texture of at least two or more oxide phases being continuously and three-dimensionally entangled with each other, where at least one of the oxide phases is a fluorescence-emitting phase and the composition as a whole is represented by:.AlO-.(.YO-.GdO-.CeO)[wherein x, y, a, b and c are each a molar fraction and satisfy 0.750&#x3c;x&#x3c;0.850, 0&#x3c;b&#x3c;0.8, 0&#x3c;c&#x3c;0.3, x+y=1 and a+b+c=1]; or.AlO-.(.YO-.CeO)(wherein x, y, a, b and c are each a molar fraction and satisfy 0.750&#x3c;x&#x3c;0.850, 0.125&#x2266;c&#x3c;0.3, x+y=1 and a+c=1). The ceramic composite light-converting member enables emitting light adjusted to a peak wavelength of 540 to 580 nm and fabricating a high-efficiency white light-emitting device by combining it with a blue light-emitting element.

Ceramic composite light-converting member and light-emitting device using the same

An Li-containing &#x3b1;-sialon phosphor particle by mixing a silicon nitride or nitrogen-containing silicon compound powder, an AlN-containing aluminum source, an Li source and an Eu source, firing the mixture at 1,500 to 1,800&#xb0; C. in a nitrogen-containing inert gas atmosphere under atmospheric pressure to obtain a lithium-containing &#x3b1;-sialon powder working out to a starting material, adding and mixing an additional lithium source to the powder, and re-firing the obtained mixture at a temperature lower than the above firing temperature or at a temperature of 1,100&#xb0; C. to less than 1,600&#xb0; C., at 1,100&#xb0; C. to less than 1,600&#xb0; C., in a nitrogen-containing inert gas atmosphere under atmospheric pressure.

Li-containing &#x3b1;-sialon-based phosphor particle, production method thereof, lighting device, and image display device

To provide sialon phosphor particles or a powder exhibiting high emission intensity in the region from ultraviolet to blue and not requiring a strong pulverization operation for pulverizing a sintered body or a large aggregated lump, and a production method thereof. Sialon phosphor particles represented by the formula: MLnSiAlON(wherein M is at least one metal selected from the group consisting of Li, Ca, Mg and Y, Ln is a lanthanide metal containing at least Eu, and assuming that the valence of the metal M is a and the valence of the lanthanide metal Ln is b, ax+by=m, x is 0&#x3c;x, y&#x2266;2.0, 0.3&#x2266;m&#x3c;4.5 and 0.5&#x2266;n&#x3c;2.5), wherein in the surface analysis by X-ray photoelectron spectroscopy, the ratio between the peak area of 3dspectrum of europium and the peak area of 2p spectrum of Si is 0.5 or less.

Sialon phosphor particles and production method thereof

A red phosphor where the crystal phase constituting the phosphor is monoclinic Eu-activated CaAlSiN. A red phosphor which is Eu-activated CaAlSiNpowder having an average particle diameter of 10 &#x3bc;m or less as measured in the non-pulverized state by the laser scattering particle size distribution analysis. A light-emitting device comprising a blue light-emitting element, a yellow phosphor capable of converting the blue light emitted from the blue light-emitting element into yellow light, and the above-described red phosphor capable of converting the blue light emitted from the blue light-emitting element into red light. A method for producing Eu-activated CaAlSiN, comprising firing a raw material powder comprising CaN, AlN, SiNand EuN at 1,400 to 2,000&#xb0; C. in a nitrogen-containing atmosphere, the CaN, AlN and SiNgiving a composition falling in the region surrounded by a straight line connecting the following four points A to D in the composition diagram of FIG., and EuN being contained in an amount of 0.01 to 10 parts by weight as Eu per 100 parts by weight in total of CaN, AlN and SiN.

Red nitride phosphor and production method thereof

A light conversion structure ensuring good light transmission and less deterioration and capable of controlling light to a desired color tone and emitting a highly bright light, and a light-emitting device using the same. The light conversion structure is a light conversion structure including a layer formed of a ceramic composite, which absorbs a part of a first light to emit a second light and transmits a part of the first light, and a fluorescent layer for the control of color tone, which is formed on the surface of the ceramic composite and which absorbs a part of the first light or a part of the second light to emit a third light and transmits a part of the first light or a part of the second light, wherein the ceramic composite includes a solidified body where at least two or more metal oxide phases are formed continuously and three-dimensionally entangled with each other, and at least one metal oxide phase in the solidified body includes a metal element oxide capable of emitting fluorescence.

Light conversion structure and light-emitting device using the same

The light-emitting diode is a light-emitting diode including a light-converting material substrate and a semiconductor layer formed on the light-converting material substrate, wherein the light-converting material substrate includes a solidified body in which at least two or more oxide phases selected from a simple oxide and a complex oxide are formed continuously and three-dimensionally entangled with each other, at least one oxide phase in the solidified body comprises a metal element capable of emitting fluorescence, and the semiconductor layer includes a plurality of compound semiconductor layers and has at least a light-emitting layer capable of emitting visible light. A light-emitting diode substrate forms a semiconductor, ensuring that the crystal-structure matching with a semiconductor for the formation of a light-emitting diode is good, a good semiconductor layer with less defects can be formed, good-efficiency light emission can be obtained from a light-emitting layer formed in the semiconductor layer, uniform florescence can be emitted by light from the light-emitting layer in the semiconductor layer, and light can be efficiently out put; and a color unevenness-free light-emitting diode using the substrate.

Light-emitting diode, light-emitting diode substrate and production method of light-emitting diode

A substrate for light-emitting diodes, obtained by stacking a single crystal layer to form a light-emitting diode element onto a ceramic composite layer for light conversion, the ceramic composite layer having been formed by a unidirectional solidification method so that the ceramic composite layer comprises a solidified body having formed therein at least two or more oxide phases selected from single metal oxides and complex metal oxides to be continuously and three-dimensionally entangled with each other, with each oxide phase having a single crystal orientation, wherein at least one oxide phase out of the oxide phases in the solidified body contains a metal element oxide capable of emitting fluorescence.

Substrate for light-emitting diode, and light-emitting diode

A white-light light emitting diode device comprising a light emitting diode element capable of emitting violet light at a wavelength of 400 to 419 nm and a ceramic composite material, wherein the ceramic composite material is a solidified body in which a cerium-activated YAlO(YAlO:Ce) crystal and an &#x3b1;-type aluminum oxide (AlO) crystal are continuously and three-dimensionally entangled with each other, the solidified body having not only a photoluminescent property of wavelength-converting a part of the violet light into yellow light but also a function of transmitting a part of the violet light, and the violet light transmitted through the ceramic composite material and yellow light resulting from wavelength conversion by the ceramic composite material are mixed to emit pseudo-white light.

White-light light emitting diode device

To provide a sialon-based phosphor capable of forming a thin film by mixing it with a resin, and giving a uniform photoluminescent light with high light emission intensity, and to provide a method for producing a sialon-based phosphor not having excessively large agglomerated particles and a wide particle size distribution, there is provided a method for producing an &#x3b1;-sialon based phosphor represented by the formula:MLnSiAlONwherein M is at least one metal selected from Ca, Mg, Y and Li, Ln is at least one lanthanide metal selected from Eu, Dy, Er, Tb, Yb and Ce, ax+by=m (assuming that the valence of metal M is a and the valence of lanthanide metal Ln is b), 0&#x3c;x&#x2266;1.5, 0.3&#x2266;m&#x2266;4.5, and 0&#x3c;n&#x3c;2.25), wherein the silicon nitride raw material used as the raw material is a silicon nitride raw material powder comprising amorphous silicon nitride and crystalline silicon nitride.

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

To provide a Sialon-based phosphor having a high photoluminescent intensity, which can realize a high brightness LED, particularly a white LED using a blue LED as the light source, and a production method of the Sialon-based phosphor. The &#x3b1;-Sialon based phosphor of the present invention is represented by the formula:LiMLnSiAlON&#x2003;&#x2003;(I)wherein M is at least one metal selected from Ca, Mg and Y, Ln is at least one lanthanide metal selected from Eu, Dy, Er, Tb, Yb and Ce, x+ay+bz=m (assuming that the valence of metal M is a and the valence of lanthanide metal Ln is b), 0&#x3c;x&#x2266;0.8, 0&#x3c;y, 0&#x3c;z, 0.3&#x2266;m&#x3c;4.5, and 0&#x3c;n&#x3c;2.25.

Sialon-based phosphor and its production method

An &#x3b1;-sialon-based oxynitride phosphor characterized in that the content of &#x3b1;-sialon represented by the general formula: MSAlON:Ln(wherein M is at least one metal selected from among Li, Ca, Mg, Y or lanthanide metals excluding La and Ce, Ln is at least one lanthanide metal selected from among Ce, Pr and La or at least one lanthanide metal selected from among Eu, Dy, Er, Tb and Yb, 0.3&#x2266;x+y&#x3c;1.5, 0&#x3c;y&#x3c;0.7, 0.3&#x2266;m&#x3c;4.5, 0&#x3c;n&#x3c;2.25, and m=ax+by, where a is the valence of the metal M and b is the valence of the lanthanide metal Ln), wherein all or a portion of the metal M dissolved in the &#x3b1;-sialon is replaced with the lanthanide metal Ln as the luminescence center, is 75 wt % or greater when the lanthanide metal Ln is at least one lanthanide metal selected from among Ce, Pr and La and 90 wt % or greater when the lanthanide metal Ln is at least one lanthanide metal selected from among Eu, Dy, Er, Tb and Yb, and in that the content of metal impurities other than the metal M, lanthanide metal Ln, silicon, IIIA elements (aluminum, gallium), oxygen and nitrogen, is no greater than 0.01 wt %.

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Ube, Japan

Shin-ichi Sakata