Kabushiki Kaisha Toshiba

Toshiba Materials Co., Ltd.

Toshiba Corporation

Neturen Co., Ltd.

Seoul Semiconductor Co., Ltd.

Hirofumi Takemura

Yasuhiro Shirakawa

Naotoshi Matsuda

Tsutomu Ishii

Daichi Usui

Yoshiaki Inoue

Masaaki Tamatani

Keiko Albessard

Miwa Okumura

Kazuhiro Kawasaki

Yoshitaka Funayama

Seiji Yokota

Akira Terajima

Yohe Shimizu

Masahiko Yamakawa

Tsuyoshi Oyaizu

Takeshi Takahara

Mitsuhiro Oikawa

Tatsunori Itoga

Akira Mikami

Satoshi Sugano

Yumi Kanno

Hiroyasu Yashima

A phosphor according to an embodiment is a europium-activated alkaline-earth chloroapatite phosphor having a composition expressed by a composition formula: (MEu)(PO)Cl, where M is an alkaline-earth element containing at least Sr and Ba, x is an atomic ratio satisfying 0.04&#x2264;x&#x2264;0.2. In the phosphor of this embodiment, absorptance of light at a wavelength of 400 nm is 90% or more, and absorptance of light at a wavelength of 650 nm is 2% or less.

Europium-activated alkaline-earth chloroapatite phosphor and light-emitting device thereof

A phosphor has a composition represented by Chemical formula 1: 1.5YO&#xb7;2.5aAlO:Ce where a is a number satisfying 1.02&#x3c;a&#x3c;1.1.

Phosphor and method of manufacturing same, and LED lamp

A phosphor of an embodiment has a composition represented by a composition formula: NaRMSO, where R represents at least one element selected from the group consisting of Y, La, Gd, and Lu, M represents at least one element selected from the group consisting of Bi, Ce, Eu, and Pr, x is an atomic ratio satisfying 0.93&#x3c;x&#x3c;1.07, y is an atomic ratio satisfying 0.00002&#x3c;y&#x3c;0.01, z is an atomic ratio satisfying 1.9&#x3c;z&#x3c;2.1, and a is an atomic ratio satisfying 0.001&#x3c;a&#x3c;0.05.

Phosphor and method of producing the same

The present invention provides a phosphor comprising a europium-activated sialon crystal having a basic composition represented by a formula: (Sr, Eu)SiAlON(1) (wherein x is 0&#x3c;x&#x3c;1, &#x3b1; is 0&#x3c;&#x3b1;&#x2266;4 and &#x3b2;, &#x3b3;, &#x3b4; and &#x3c9; are numbers such that converted numerical values when &#x3b1; is 3 satisfy 9&#x3c;&#x3b2;&#x2266;15, 1&#x2266;&#x3b3;&#x2266;5, 0.5&#x2266;&#x3b4;&#x2266;3 and 10&#x2266;&#x3c9;&#x2266;30), wherein the phosphor is composed of particles having a sphericity of 0.65 or more and emits green light by being excited by ultraviolet light, violet light or blue light.

Phosphor, method for producing phosphor and light emitting device

The present invention provides a phosphor comprising a cerium-activated sialon crystal having a basic composition represented by formula (1):(Sr,Ce)SiAlON&#x2003;&#x2003;formula: (1)(wherein, x is 0&#x3c;x&#x3c;1, &#x3b1; is 0&#x3c;&#x3b1;&#x2266;3, and &#x3b2;, &#x3b3;, &#x3b4; and &#x3c9; are numbers such that numerical values converted when &#x3b1; is 2 satisfy 5&#x2266;&#x3b2;&#x2266;9, 1&#x2266;&#x3b3;&#x2266;5, 0&#x2266;&#x3b4;&#x2266;1.5, and 10&#x2266;&#x3c9;&#x2266;20), wherein the phosphor includes particles having a sphericity of 0.65 or more and emits yellow light by being excited by ultraviolet light, violet light or blue light.

Phosphor of SiAlON crystal, method for producing phosphor and light emitting device

A phosphor for light emitting device of an embodiment includes: a phosphor particle composed of at least one selected from an alkaline earth silicate phosphor, a lanthanum oxysulfide phosphor, and a zinc sulfide phosphor; and a surface treatment agent, provided to cover a surface of the phosphor particle, of at least one selected from a silane coupling agent and an acrylic emulsion. A luminance maintenance ratio of the phosphor represented by a formula: luminance B/luminance A&#xd7;100(%), is 98% or more, wherein the luminance A is a luminance of the phosphor made to emit under a condition of temperature: 23&#xb0; C., humidity: 40%, and the luminance B is a luminance of the phosphor made to emit under a condition of temperature: 23&#xb0; C., humidity: 40% after leaving the phosphor under a condition of temperature: 60&#xb0; C., humidity: 90% for 12 hours.

Phosphor for light emitting device and method for manufacturing the same, and light emitting device using the same

A red emitting phosphor comprises a yttrium oxysulfide phosphor as a base material. A red emitting phosphor of medium particle size type has such a particle size distribution that a content of a component of a particle diameter of less than 4.0 &mgr;m is 15% or less, that of a component of a particle diameter of 4.0 &mgr;m or more and less than 8.0 &mgr;m is 75% or more, and that of a component of a particle diameter of 8.0 &mgr;m or more is 10% or less. A red emitting phosphor of larger particle size type has such a particle size distribution that the content of a component of a particle diameter of less than 5.04 &mgr;m is 20% or less, that of a component of a particle diameter of 5.04 &mgr;m or more and less than 10.079 &mgr;m is 70% or more, and that of a component of a particle diameter of 10.079 &mgr;m or more is 10% or less. Phosphor layers employing these red emitting phosphors are excellent in denseness. Accordingly, a cathode ray tube of high contrast and high quality can be provided.

Red emitting phosphor for cathode ray tube

An electroluminescent phosphor comprises zinc sulfide as a phosphor base material, at least one kind selected from copper and manganese as an activator, and at least one kind selected from chlorine, bromine, iodine, and aluminum as a coactivator. The content of alkaline earth metal elements in the electroluminescent phosphor is 0.05% by weight or less. In addition, the electroluminescent phosphor includes cesium in the range of 0.0001% by weight or more and 0.01% by weight or less. Such an electroluminescent phosphor has excellent brightness and life. An electroluminescent element comprises a phosphor layer in which an electroluminescent phosphor is dispersed in a dielectric. The electroluminescent phosphor includes reduced amount of alkaline earth metal elements and a slight amount of cesium.

Electroluminescent phosphor and electroluminescent element using the same

In the method, apparatus and the substance produced thereby: a plasma flame 1 is produced by a plasma torch 11; the plasma flame 1 is passed through a plasma flame furnace 21 which controls the heat of the plasma flame 1; then, the plasma flame 1 is injected into a reactor column 31 to heat the substance. The substance may be a particle. The plasma flame 1 has a wide flame area in which a temperature of flame is uniform.

Heat treatment method and apparatus using thermal plasma, and heat

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Kamakura, Japan

Hirofumi Takemura