Kabushiki Kaisha Toshiba

Toshiba Materials Co., Ltd.

National University Corporation Nara Institute of Science and Technology

Daichi Usui

Yasuhiro Shirakawa

Hirofumi Takemura

Tsutomu Ishii

Naotoshi Matsuda

Masahiko Yamakawa

Yasumasa Ooya

Katsutoshi Nakagawa

Makoto Hayashi

Yoshitaka Funayama

Takayuki Yanagida

Takumi Kato

Hiromi Kimura

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 light emitting deviceaccording to an embodiment includes a planar alumina substrate, a semiconductor light-emitting element mounted on the alumina substrate, and a phosphor layer. The phosphor layer includes a silicone resin layer provided to cover an upper surface and a side surface of the semiconductor light-emitting element and a phosphor emitting visible light by being excited with light emitted from the semiconductor light-emitting element. The phosphor is dispersed in the silicone resin layer. The alumina substrate has a water absorption rate of 5% or more and 60% or less, and an adhesion strength between the alumina substrate and the silicone resin layer is 1 N or more.

Light emitting device

A semiconductor light emitting element emits ultraviolet light or blue light that impinges upon a light emitting cover portion including a blue phosphor, a green phosphor, a red phosphor and a deep red phosphor to emit white light by mixing the light emission colors from the phosphors. The deep red phosphor has a main emission peak in a longer wavelength region than a main emission peak of the red phosphor. The red phosphor includes at least one component selected from: a europium-activated SiAlON phosphor and a europium-activated CASN phosphor each having a predetermined composition. The deep red phosphor includes a manganese-activated magnesium florogermanate phosphor having a predetermined composition. The white light emitting lamp is excellent in both high luminance and high color rendering properties.

White light emitting lamp and white LED lighting apparatus including the same

Growing community of inventors

Yokohama, Japan

Daichi Usui