Mitsui Minings & Melting Co., Ltd.

Tottori University

Jun-ichi Itoh

Asuka Sasakura

Takayoshi Mori

Masaaki Inamura

Akinori Kumagai

Haruka Shimizu

Ikuhiro Ozawa

Tomoyasu Yano

Riichi Ogawara

Taizou Morinaka

Koutoku Ohmi

Masanori Sato

Taizo Morinaka

Michiyo Inoue

Makoto Higuchi

Riko Sato

Provided is a new phosphor which can be excited by visible light in a wide band to emit a broad fluorescence spectrum, and also to emit near-infrared light with high intensity. Proposed is a phosphor, which is an oxide comprising Ca, Cu, and Si, wherein the containing molar ratios of the elements are 0.15&#x2264;Ca/Si&#x3c;0.25 and 0.13&#x2264;Cu/Si&#x3c;0.25.

Phosphor

Proposed is a phosphor capable of effectively inhibiting the occurrence of adverse influence of a sulfur-based gas while improving water resistance of the phosphor and effectively inhibiting the corrosion of a metallic member. A phosphor is proposed, which includes particles or a layer provided on the surface of a sulfur-containing phosphor, which contains sulfur in a host material, and containing a crystalline metal borate containing an IIA-Group element, boron, and oxygen.

Phosphor and use thereof

Provided is a phosphor, which is excited by a wide band of visible light, capable of emitting near-infrared light of high intensity. The phosphor comprises a crystal phase represented by a formula (1): MCuSiO(where M comprises one or more of Ba, Sr and Ca), and a crystal phase represented by a formula (2): MCuSiO(where M comprises one or more of Ba, Sr and Ca), wherein a ratio &#x3b2; of a diffraction peak intensity of MCuSiOwith respect to a diffraction peak intensity of MCuSiOin an X-ray diffraction (XRD) pattern obtained by powder XRD measurement using CuK&#x3b1; rays is 0&#x3c;&#x3b2;&#x2264;0.50.

Provided is a novel CaS-based phosphor with which chemical reactions can be inhibited even if said CaS-based phosphor is heated with a heterogeneous material. This phosphor includes: a crystalline parent material represented by the composition formula CaSrS.yZnO (in the formula, 0&#x2266;x&#x3c;1, 0&#x3c;y&#x2266;0.5); and a luminescent center.

Phosphor, LED light-emission element, and light source device

Provided is a novel coated phosphor capable of effectively suppressing the adverse effects of hydrogen sulfide gas generated by the reaction between a sulfur-containing phosphor and moisture in the air. Provided is a sulfur-containing phosphor having a configuration in which ZnO compound containing Zn and O is present on the surface of a sulfur-containing phosphor having a host material which includes sulfur.

Sulfur-containing phosphor coated with ZnO compound

An emitting phosphor is provided, which can be excited by a blue LED or a near-UV LED, emit visible light and increase internal quantum efficiency. An emitting phosphor is proposed, comprising an orthorhombic crystal system comprising Ga and S, wherein the orthorhombic crystal system has, in an XRD pattern using a Cu K&#x3b1; beam, a proportion of the diffraction intensity of the maximum peak appearing at diffraction angle 2&#x3b8;=16.0 to 18.0&#xb0; with respect to the diffraction intensity of the maximum peak appearing at diffraction angle 2&#x3b8;=23.6 to 24.8&#xb0; of 0.4 or greater.

Emitting Phosphor

A green emitting phosphor exhibiting an excellent absorption ratio is provided. A green emitting phosphor containing a crystal represented by MGaS:Eu, wherein M is an element comprising one species or a combination of two or more species among Sr, Ba and Ca, and Euis a luminescent center, and wherein the particle diameter at 10%, D10, 4.5 &#x3bc;m to 30 &#x3bc;m in the volume-based particle size distribution measured and obtained by the laser diffraction/diffusion particle size distribution measurement method.

Green emitting phosphor

A green emitting phosphor is provided, allowing the internal quantum efficiency to be increased. The green emitting phosphor comprises a mother crystal containing Sr, Ga and S, and a luminescent center, characterized in that, in an XRD pattern, the ratio of the diffraction intensity of the maximum peak appearing at diffraction angle 2&#x3b8;=14 to 20&#xb0; over the diffraction intensity of the maximum peak appearing at diffraction angle 2&#x3b8;=21 to 27&#xb0; is 0.4 or greater.

A white phosphor is provided, which is a white phosphor comprising a single material, wherein the light-emitting center is one element other than Mn, and emitting white light having excellent color rendering properties by near ultraviolet excitation. The white phosphor is represented by the formula SrSMgZnSiO:Eu(with the proviso that when e=1, 0&#x3c;(c+d)/(a+c+d)&#x2266;0.2, 1.8&#x2266;a+c+d&#x2266;2.2, 0&#x2266;b/(b+f)&#x2266;0.07 and 3.0&#x2266;b+f&#x2266;4.4), among which, as one preferred example, the white phosphor is represented by the composition formula (SrOS).(MgZnO).(SiO):Eu(in the formula, 4.5&#x2266;x/y&#x2266;27.5, 3&#x2266;z/y&#x2266;14.5, 0&#x2266;&#x3b1;&#x2266;0.3 and 0&#x2266;&#x3b2;&#x2266;0.7) is proposed.

White phosphor, and white light-emitting equipment or device

A method for producing a blue phosphor, comprising firing a mixture for 2 to 24 hours at a temperature of 800&#xb0; C. or higher in an atmosphere of hydrogen sulfide, carbon disulfide, or an inert gas, the mixture containing a barium compound component, a silicon compound component, and a cerium compound component in quantitative proportions such that the atomic ratios of the components fulfill the equations 0.50&#x3c;Si/Ba&#x2266;0.70 and 0.0005 &#x2266;Ce/Ba&#x2266;0.03, or the mixture further containing a sulfur compound component in addition to these components. The blue phosphor has high color purity, high luminance, high chemical stability, and a low crystallization temperature, and is suitable for use in displays such as FED, PDP, and EL displays, or for use in the excitation of near-ultraviolet LED.

Growing community of inventors

Ageo, Japan

Jun-ichi Itoh