Dexerials Corporation

Samsung Electronics Co., Ltd.

Sony Corporation

Takamasa Izawa

Tsuneo Kusunoki

Takahiro Igarashi

Hiraku Akiho

Masaki Kanno

Dohoon Kim

Takatoshi Seto

Masahiko Yoshino

A compound is provided containing silicon, aluminum, strontium, europium, nitrogen, and oxygen is used that enables a red phosphor having strong luminous intensity and high luminance to be obtained, and that enables the color gamut of a white LED to be increased with the use of red phosphor. The red phosphor contains element A, europium, silicon, aluminum, oxygen, and nitrogen at the atom number ratio of the following formula: [A)Eu]SiAlON. The element A in the formula is at least one of magnesium, calcium, strontium, and barium, and m, x, y, and n in the formula satisfy the relations 3&#x3c;m&#x3c;5, 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;2, and 0&#x3c;n&#x3c;10.

Red phosphor, method for producing red phosphor, white light source, illuminating device, and liquid crystal display device

A method for manufacturing green-emitting phosphor particles including the steps of producing a powder containing europium and strontium from a solution containing a europium compound and a strontium compound, mixing the resulting powder and a powdered gallium compound, and performing firing.

Green-emitting phosphor particles, method for manufacturing green-emitting phosphor particles, color conversion sheet, light-emitting device, and image display device assembly

A yellow phosphor is provided. The yellow phosphor includes a crystal formed of a compound that is represented by the following formula (1): Ln(EuM)SiAlON(0.5&#x2266;x&#x2266;3, 0&#x3c;z&#x3c;0.3, 0&#x3c;y&#x2266;4) (1), wherein Ln includes at least one rare earth element, and M includes at least one selected from calcium (Ca), barium (Ba), strontium (Sr), and magnesium (Mg).

Phosphor and light-emitting device including the same

A compound is provided containing silicon, aluminum, strontium, europium, nitrogen, and oxygen is used that enables a red phosphor having strong luminous intensity and high luminance to be obtained, and that enables the color gamut of a white LED to be increased with the use of the red phosphor. The red phosphor contains an element A, europium, silicon, aluminum, oxygen, and nitrogen at the atom number ratio of the following formula: [AEu]SiAlON. The element A in the formula is at least one of magnesium, calcium, strontium, and barium, and m, x, y, and n in the formula satisfy the relations 3&#x3c;m&#x3c;5, 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;2, and 0&#x3c;n&#x3c;10.

A red phosphor of high efficiency and a method for producing it are provided. A white light source and an illumination device that allow illumination with the pure white color using the red phosphor are also provided. In addition, a liquid crystal display device using the red phosphor and exhibiting good color reproducing performance is provided. The red phosphor contains an element A, europium (Eu), silicon (Si), carbon (C), oxygen (O) and nitrogen (N) in the ratios of the numbers of atoms of the following compositional formula (1):[Chemical Formula 1][AEu][SiC]ON&#x2003;&#x2003; compositional formula (1)where the element A is at least one of magnesium (Mg), calcium (Ca), strontium (Sr) and barium (Ba), and where m, x and n in the compositional formula (1) satisfy the relationships of 3&#x3c;m&#x3c;5, 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;2 and 0&#x3c;n&#x3c;10 (FIG.A).

Provided is a process for producing a red phosphor, said process achieving enhanced productivity. Also provided are: a red phosphor having excellent luminescence characteristics; and a white light source, a lighting system, and a liquid crystal display device, using the red phosphor. This process comprises: mixing an A-containing compound, a nitrogen-free europium source, a silicon-containing compound, an aluminum-containing compound and a carbon-containing reducing agent so as to form a mixture wherein the atomic ratio among A, europium (Eu), silicon (Si), aluminum (Al) and carbon (C) is a value represented by compositional formula (1); firing the mixture; and pulverizing the fired mixture. (Am&#x2212;xEux)Aly(Si1&#x2212;zCz)90 nN[12+y&#x2212;2(n&#x2212;m)/3] (1) [wherein A is at least one element selected from among magnesium (Mg), calcium (Ca), strontium (Sr) and barium (Ba), and m, x, z and n satisfy the relationships: 3.

Method for manufacturing red phosphor

A process for producing a coated phosphor, namely a phosphor coated with a coating material, which includes a mixing step of mixing a phosphor with a coating material in a solvent to form a mixed fluid and a separation step of separating the mixed fluid into a solid phase and a liquid phase, wherein the phosphor comprises barium (Ba), strontium (Sr), europium (Eu), silicon (Si) and oxygen (O) at an atomic ratio represented by compositional formula (1), and the mass ratio of the phosphor to the coating material is 40:260 to 200:260, [(Ba1-ySry)1-xEux]aSibOc (1) [wherein a, b, c, x and y satisfy the relationships: 2.7&#x3c;a&#x3c;3.3, 0.9&#x3c;b&#x3c;1.1, 4.5&#x3c;c&#x3c;5.5, 0&#x3c;x&#x3c;0.09 and 0.25&#x3c;y&#x3c;0.75].

Method for manufacturing coated phosphor, and coated phosphor

A compound is provided containing silicon, aluminum, strontium, europium, nitrogen, and oxygen is used that enables a red phosphor having strong luminous intensity and high luminance to be obtained, and that enables the color gamut of a white LED to be increased with the use of the red phosphor. The red phosphor contains an element A, curopium, silicon, aluminum, oxygen, and nitrogen at the atom number ratio of the following formula: [AEu]SiAlON. The element A in the formula is at least one of magnesium, calcium, strontium, and barium, and m, x, y, and n in the formula satisfy the relations 3&#x3c;m&#x3c;5, 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;2, and 0&#x3c;n&#x3c;10.

The present invention provides an efficient red fluorescent material and a method for producing the same, provides a white light source and an illuminating device each of which uses this red fluorescent material to achieve snow-white lighting, and furthermore provides a liquid crystal display having excellent color reproduction. The red fluorescent material contains an element (A), europium (Eu), silicon (Si), carbon (C), oxygen (O), and nitrogen (N), at an atomic ratio of the following in compositional formula (1).[AEu][SiC]ON] Note that, in the compositional formula (1), element A is group 2 element including at least calcium (Ca) and strontium (Sr). Also, note that, in the composition formula (1), m, x, y, and n satisfy 3&#x3c;m&#x3c;5, 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;9, and 0&#x3c;n&#x3c;10, respectively. Such red fluorescent material is able to improve quantum efficiency, compared with a red fluorescent material which does not contain calcium (Ca) but contains strontium (Sr) as the element A.

Red fluorescent material, method for producing red fluorescent material, white light source, illuminating device, and liquid crystal display

The present invention provides an efficient red fluorescent material and a method for producing the same, provides a white light source and an illuminating device each of which uses this red fluorescent material to achieve snow-white lighting, and furthermore provides a liquid crystal display having excellent color reproduction. The red fluorescent material contains an element A, europium, silicon, carbon, oxygen, and nitrogen, at an atomic ratio of the following composition formula (1), and, in a Photo Luminescence Excitation spectrum of the red fluorescent material, a relative value of a luminescence intensity of 550 nm excitation wavelength when a luminescence intensity of 400 nm excitation wavelength is defined as 1 is not more than 0.85 and not less than 0.55.[AEu][SiC]ON

A red phosphor of high efficiency and a method for producing it are provided. A white light source and an illumination device that allow illumination with the pure white color using the red phosphor are also provided. In addition, a liquid crystal display device using the red phosphor and exhibiting good color reproducing performance is provided. The red phosphor contains an element A, europium (Eu), silicon (Si), carbon (C), oxygen (O) and nitrogen (N) in the ratios of the numbers of atoms of the following compositional formula (1):[Chemical Formula 1][AEu][SiC]ON&#x2003;&#x2003;compositional formula (1)where the element A is at least one of magnesium (Mg), calcium (Ca), strontium (Sr) and barium (Ba), and where m, x and n in the compositional formula (1) satisfy the relationships of 3&#x3c;m&#x3c;5, 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;2 and 0&#x3c;n&#x3c;10 (FIG.A).

Disclosed herein is a lighting device including a blue light-emitting element adapted to emit a blue light beam; and a green phosphor layer which is disposed apart from the blue light-emitting element and can function as a light diffusion layer, the green phosphor layer including a green phosphor adapted to emit green fluorescence when excited by the blue light beam, the green phosphor having a refractive index of 1.49 or more and a quantum efficiency of 79% or more.

Growing community of inventors

Kanagawa, Japan

Takamasa Izawa