Nichia Corporation

Tadayoshi Yanagihara

Shoji Hosokawa

Naoto Fujioka

Keisuke Suzuki

Tomoya Fukui

Kazuya Nishimata

Sadakazu Wakui

Takashi Kaide

Kenichi Aoyagi

Hirofumi Ooguri

Motoharu Morikawa

Shigeki Yoshida

Hiroshi Ogasa

Provided is a method for producing a wavelength conversion sintered body that emits light under irradiation of excitation light. The method for producing a wavelength conversion sintered body includes: preparing a molded body obtained by molding a mixture containing an &#x3b1;-SiAlON fluorescent material and aluminum oxide particles and having a content of Ga of 15 ppm by mass or less; and primary calcining the molded body at a temperature in a range of 1,370&#xb0; C. or more and 1,600&#xb0; C. or less to obtain a first sintered body.

Method for producing wavelength conversion sintered body

A method for manufacturing a wavelength conversion member that offers a high emission intensity and a high light conversion efficiency is provided. The method for manufacturing a wavelength conversion member includes providing a green body containing an yttrium-aluminum-garnet phosphor with a composition represented by Formula (I) below and alumina particles with an alumina purity of 99.0% by mass or more, primary-sintering the green body to obtain a first sintered body, and secondary-sintering the first sintered body by applying a hot isostatic pressing (HIP) treatment to obtain a second sintered body.(YGdCe)AlO&#x2003;&#x2003;(I)wherein a and b satisfy 0&#x2264;a&#x2264;0.3 and 0&#x2264;b&#x2264;0.022.

Method for manufacturing wavelength conversion member

A method for producing a wavelength converting member that emits light under irradiation of excitation light, and a wavelength converting member. The method for producing a wavelength converting member, including: providing a green body prepared by a process comprising molding a mixed powder containing a Ca-&#x3b1;-SiAlON fluorescent material and alumina, and depending on necessity an YAG fluorescent material; and primarily sintering the green body at a temperature in a range of 1,000&#xb0; C. or more and 1,600&#xb0; C. or less to obtain a first sintered body.

Method for producing wavelength converting member, and wavelength converting member

Provided are a method for producing a ceramic composite material that has a high light emission intensity, a ceramic composite material, and a light emitting device. The method for producing a ceramic composite material, includes: preparing a green body containing a nitride fluorescent material having a composition represented by the following chemical formula (I) and aluminum oxide particles mixed with each other; and performing primary sintering the green body at a temperature in a range of 1,250&#xb0; C. or more and 1,600&#xb0; C. or less to provide a first sintered body:MLnAN&#x2003;&#x2003;(I)wherein in the chemical formula (I), M represents at least one element selected from the group consisting of Ce and Pr; Lnrepresents at least one element selected from the group consisting of Sc, Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; A represents at least one element selected from the group consisting of Si and B; and w, x, y, and z each satisfy 0&#x3c;w&#x2264;1.0, 2.5&#x2264;x&#x2264;3.5, 5.5&#x2264;y&#x2264;6.5, and 10&#x2264;z&#x2264;12.

Method for producing ceramic composite material, ceramic composite material, and light emitting device

Provided are a ceramic complex having high light emission intensity and a method for producing the same. Proposed is a ceramic complex, including a rare earth aluminate fluorescent material having a composition represented by the following formula (I) and an aluminum oxide, wherein the content of the aluminum oxide is 70% by mass or more, the content of Na is 7 ppm by mass or less, the content of Si is 5 ppm by mass or less, the content of Fe is 3 ppm by mass or less, and the content of Ga is 5 pm by mass or less, relative to the total amount of the rare earth aluminate fluorescent material having a composition represented by the following formula (I) and the aluminum oxide.(LnCe)AlO&#x2003;&#x2003;(I)

Ceramic complex and method for producing the same

A method for manufacturing a wavelength conversion member that offers a high emission intensity and a high light conversion efficiency is provided. The method for manufacturing a wavelength conversion member includes providing a green body containing an yttrium-aluminum-garnet phosphor with a composition represented by Formula (I) below and alumina particles with an alumina purity of 99.0% by mass or more, primary-sintering the green body to obtain a first sintered body, and secondary-sintering the first sintered body by applying a hot isostatic pressing (HIP) treatment to obtain a second sintered body.(YGdCe)AlO&#x2003;&#x2003;(I)wherein a and b satisfy 0&#x2264;a&#x2264;0.3 and 0&#x3c;b&#x2264;0.022.

A method of producing a fluorescent material that is capable of providing a light emitting device having excellent durability, a fluorescent material, and a light emitting device are provided. The method of producing the fluorescent material includes: preparing a calcined product having a chlorosilicate composition containing at least one element selected from the group consisting of Ca, Sr, and Ba, at least one element selected from the group consisting of Mg and Zn, at least one element selected from the group consisting of Eu, Ce, Tb, and Mn, Si, O, and Cl; and bringing the calcined product in contact with a fluorine-containing substance and heat-treating the calcined product in an inert gas atmosphere at a temperature in a range of 200&#xb0; C. or more and 450&#xb0; C. or less.

Method for producing fluorescent material, fluorescent material, and light emitting device using the same

A method of producing a nitride fluorescent material is provided. The nitride fluorescent material undergoes less change in chromaticity under a high-temperature and high-humidity condition and are excellent in durability. The nitride fluorescent material has a composition containing: at least one element selected from the group consisting of Ca, Sr, Ba, and Mg; at least one element selected from the group consisting of Li, Na, and K; at least one element selected from the group consisting of Eu, Ce, Tb, and Mn; Al; and N. The method includes: preparing a calcined product having the composition, bringing the calcined product in contact with a fluorine-containing substance, and heat-treating the calcined product at a temperature of 200&#xb0; C. or more and 500&#xb0; C. or less. A light emitting device using the nitride fluorescent material is also provided.

Method of producing nitride fluorescent material, nitride fluorescent material, and light emitting device using the same

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.

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Tokushima, Japan

Tadayoshi Yanagihara