Nichia Corporation

Hirofumi Ooguri

Shoji Hosokawa

Hideki Yoshida

Yuji Akazawa

Tadayoshi Yanagihara

Shozo Taketomi

Shigeki Yoshida

Masaki Kondo

Koji Kajikawa

Tomoya Fukui

Takafumi Sumie

Seigo Sunagawa

Tsunehito Niimi

A method of producing a modified fibrous wollastonite is provided. The method includes hydrothermally treating a fibrous wollastonite.

Modified fibrous wollastonite and method of producing the same

Provided are a method for producing a ceramic sintered body having improved light emission intensity, a ceramic sintered body, and a light emitting device. The method for producing a ceramic sintered body comprises preparing a molded body that contains a nitride fluorescent material having a composition containing: at least one alkaline earth metal element Mselected from the group consisting of Ba, Sr, Ca, and Mg; at least one metal element Mselected from the group consisting of Eu, Ce, Tb, and Mn; Si; and N, wherein a total molar ratio of the alkaline earth metal element Mand the metal element Min 1 mol of the composition is 2, a molar ratio of the metal element Mis a product of 2 and a parameter y and wherein y is in a range of 0.001 or more and less than 0.5, a molar ratio of Si is 5, and a molar ratio of N is 8, and wherein the nitride fluorescent material has a crystallite size, as calculated by X-ray diffraction measurement using the Halder-Wagner method, of 550 Å or less, and calcining the molded body at a temperature in a range of 1,600° C. or more and 2,200° C. or less to obtain a sintered body.

Method for producing ceramic sintered body, ceramic sintered body, and light emitting device

A ceramic complex that has improved optical characteristics including luminous efficiency is provided. A method for producing a ceramic complex, including: preparing a molded body containing rare earth aluminum garnet fluorescent material, aluminum oxide, and lutetium oxide, and having a content of the rare earth aluminum garnet fluorescent material in a range of 15% by mass or more and 50% by mass or less, and a content of the lutetium oxide in a range of 0.2% by mass or more and 4.5% by mass or less, based on the total amount of the rare earth aluminum garnet fluorescent material, the aluminum oxide, and the lutetium oxide; and calcining the molded body in an air atmosphere to provide a ceramic complex having a relative density in a range of 90% or more and less than 100%.

Ceramic complex light emitting device using the same, and method for producing ceramic complex

Provided are a method for producing a ceramic sintered body having improved light emission intensity, a ceramic sintered body, and a light emitting device. The method for producing a ceramic sintered body comprises preparing a molded body that contains a nitride fluorescent material having a composition containing: at least one alkaline earth metal element Mselected from the group consisting of Ba, Sr, Ca, and Mg; at least one metal element Mselected from the group consisting of Eu, Ce, Tb, and Mn; Si; and N, wherein a total molar ratio of the alkaline earth metal element Mand the metal element Min 1 mol of the composition is 2, a molar ratio of the metal element Mis a product of 2 and a parameter y and wherein y is in a range of 0.001 or more and less than 0.5, a molar ratio of Si is 5, and a molar ratio of N is 8, and wherein the nitride fluorescent material has a crystallite size, as calculated by X-ray diffraction measurement using the Halder-Wagner method, of 550 &#x212b; or less, and calcining the molded body at a temperature in a range of 1,600&#xb0; C. or more and 2,200&#xb0; C. or less to obtain a sintered body.

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

A method of producing a thiogallate-based fluorescent material having a large particle diameter and an enhanced luminance, and a sulfite for a thiogallate-based fluorescent material are provided. The method of producing a thiogallate-based fluorescent material includes preparing a first solution containing at least one element M1 selected from the group consisting of strontium, beryllium, magnesium, calcium, barium and zinc, and at least one element M2 selected from the group consisting of europium and cerium, and a second solution containing a sulfite; simultaneously supplying the first solution and the second solution to a reaction vessel and causing a reaction in a reaction system to obtain a powder of a sulfite containing M1 and M2; and obtaining the thiogallate-based fluorescent material from the resulting powder of a sulfite containing M1 and M2.

Method of producing thiogallate-based fluorescent material and a sulfite for a thiogallate-based fluorescent material

Provided are a method of producing a thiogallate-based fluorescent material, a method of producing a light-emitting device, a thiogallate-based fluorescent material, and a light-emitting device. The method of producing a thiogallate-based fluorescent material includes preparing a first solution containing at least one M1 ion selected from the group consisting of Sr, Be, Mg, Ca, Ba and Zn, and at least one M2 ion selected from the group consisting of Eu and Ce, and a second solution containing a sulfite ion, simultaneously supplying the first solution and the second solution to a reactor to obtain a powder containing a sulfite that contains an element M1 and an element M2, mixing a raw material that contains the powder containing the sulfite that contains the element M1 and the element M2 and a powder containing a gallium compound, with lithium chloride to obtain a mixture, and heat-treating the mixture to obtain a thiogallate-based fluorescent material.

Method of producing thiogallate-based fluorescent material, method of producing light-emitting device, thiogallate-based fluorescent material and light-emitting device

A fluorescent material particle including: a particle that contains a thiogallate phosphor and a first adherent member containing boron oxide and being disposed on the surface of the particle, a method for producing the fluorescent material particles, and a light emitting device are provided.

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Komatsushima, Japan

Hirofumi Ooguri