Nichia Corporation

Takashi Kaide

Shoji Hosokawa

Kenichi Aoyagi

Motoharu Morikawa

Takuya Nakabayashi

Tetsuya Ishikawa

Yuya Takahashi

Tadayoshi Yanagihara

Provided a method of producing a &#x3b2;-sialon fluorescent material having excellent emission intensity. The method includes providing a first composition containing aluminum, an oxygen atom, and a europium-containing silicon nitride, heat treating the first composition, contacting the heat-treated composition and a basic substance to obtain a second composition, and contacting the second composition resulting from contacting the heat-treated composition with the basic substance and an acidic liquid medium containing an acidic substance.

Method of producing beta-sialon fluorescent material

Provided is a method of producing a &#x3b2;-sialon fluorescent material having a high light emission intensity and an excellent light emission luminance. The method includes preparing a calcined product having a composition of &#x3b2;-sialon containing an activating element; grinding the calcined product to obtain a ground product; and heat-treating the ground product to obtain a heat-treated product. A specific surface area of the ground product is 0.2 m/g or more.

Method of producing &#x3b2;-sialon fluorescent material

A method for producing &#x3b2;-sialon fluorescent material having excellent emission intensity is provided. The method for producing &#x3b2;-sialon fluorescent material includes providing a composition comprising silicon nitride that contains aluminium, an oxygen atom, and europium, heat treating the composition, contacting the heat-treated composition with a basic substance, and washing the composition, which has been contacted with the basic substance, with an acidic liquid medium.

Method  for producing &#x3b2;-sialon fluorescent material

A fluorescent material is provided that has improved luminance and can generate fluorescence by excitation light in wider wavelength range. A fluorescent material represented by a general formula LaCeSiN, wherein 2.0&#x2264;x&#x2264;3.5, 0&#x3c;y&#x2264;1.0, wherein the fluorescent material comprises 10 to 10000 ppm of Ba and/or Sr, and wherein a first wavelength and a second wavelength at which excitation intensities are 70% of the maximum of the excitation intensities are present in a wavelength range of 400 to 510 nm, the second wavelength being longer than the first wavelength, and a difference between the first wavelength and the second wavelength being 70 nm or more.

Fluorescent material and light emitting device using same and method for manufacturing fluorescent material

A wavelength converting member comprising a first wavelength converting layer containing: a first fluorescent material having a light emission peak wavelength in a range of 620 nm or more and 660 nm or less; a second fluorescent material having a light emission peak wavelength in a range of 510 nm or more and 560 nm or less; and a resin, wherein the average particle diameter, as measured according to a Fisher Sub-Sieve Sizer method, of the first fluorescent material is in a range of 2 &#x3bc;m or more and 30 &#x3bc;m or less, wherein the second fluorescent material comprises a &#x3b2;-SiAlON fluorescent material, the circularity of the &#x3b2;-SiAlON fluorescent material is 0.7 or more, and the volume average particle diameter, as measured according to a laser diffraction scattering particle size distribution measuring method, of the &#x3b2;-SiAlON fluorescent material is in a range of 2 &#x3bc;m or more and 30 &#x3bc;m or less, and wherein the thickness of the first wavelength converting layer is in a range of 50 &#x3bc;m or more and 200 &#x3bc;m or less.

Wavelength converting member and light emitting device

A method for producing a &#x3b2;-sialon fluorescent material superior in light emitting luminance is provided. The method includes heat-treating a first mixture containing an aluminum compound, a europium compound, and a first silicon oxynitride compound to obtain a first heat-treated product, and heat-treating a second mixture containing the first heat-treated product, an aluminum compound, a europium compound, and a second silicon oxynitride compound, which has a larger oxygen content than the first silicon oxynitride compound, to obtain a second heat-treated product.

Method for producing beta-sialon fluorescent material

A method for producing a &#x3b2;-sialon fluorescent material can be provided. The method includes preparing a composition containing silicon nitride that contains aluminium, an oxygen atom, and europium, heat-treating the composition in a rare gas atmosphere or in a vacuum, and contacting the heat-treated composition with a gas containing elemental fluorine.

Method for producing &#x3b2;-sialon fluorescent material

A method for producing a &#x3b2;-sialon fluorescent material is provided. The method includes heat-treating a mixture containing an aluminum compound, a first europium compound, and silicon nitride to obtain a first heat-treated product; and heat-treating the first heat-treated product with a second europium compound in a rare gas atmosphere to obtain a second heat-treated product.

A phosphor, which is represented by the general formula containing M, Ce, Pr, Si, and N, is provided. M is at least one element selected from the group consisting of La, Y, Tb and Lu. A molar ratio of M is greater than 2.0 and smaller than 3.5. A molar ratio of Ce is greater than 0 and smaller than 1.0. A molar ratio of Pr is greater than 0 and smaller than 0.05. A molar ratio of N is greater than 10 and smaller than 12, under the condition that a molar ratio of Si is set to 6. The phosphor further contains 10 to 10,000 ppm of fluorine.

Phosphor, light-emitting apparatus including the same, and phosphor production method

A phosphor is provided which is represented by the general formula MCeSiBN. M is at least one element selected from the group consisting of La, Y, Tb and Lu. And w, x, y, and z satisfy 2.0&#x3c;w&#x3c;4.0, 2.0&#x3c;x&#x3c;3.5, 0&#x3c;y&#x3c;1.0, and 0&#x3c;z&#x3c;2.0, respectively. The phosphor can be efficiently excited by light in a range from near-ultraviolet to blue light, and emit light having components that widely extend mainly from green range to yellow range. A light-emitting apparatus includes the phosphor together with a light-emitting device that emits light in a range from near-ultraviolet to blue light, and can have improved light emission efficiency, good color rendering property, and good color reproduction range. In the case where a light-emitting apparatus includes an additional phosphor, it is possible to further improve its light emission spectrum.

A phosphor is provided which is represented by the general formula MCePrSiN. M is at least one element selected from the group consisting of La, Y, Tb and Lu. And x, y, z and w satisfy 2.0&#x3c;x&#x3c;3.5, 0&#x3c;y&#x3c;1.0, 0&#x3c;z&#x3c;0.05, and 2.0&#x3c;w&#x3c;4.0, respectively.

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Anan, Japan

Takashi Kaide