Mitsui Minings & Melting Co., Ltd.

Tottori University

Tomoyasu Yano

Jun-ichi Itoh

Asuka Sasakura

Isamu Yashima

Norihiko Miyashita

Ryoma Tsukuda

Koutoku Ohmi

Makoto Higuchi

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.

Method for producing blue phosphor

A p-type thermoelectric material is prepared by mixing and melting at least two members selected from bismuth, tellurium, selenium, antimony, and sulfur to obtain an alloy ingot; grinding the alloy ingot to obtain powder of the allow mass; and hot pressing the powder. At least the hot pressing is carried out in the presence of any one of hexane and solvents represented by CHOH or CHCO (where n is 1, 2 or 3). A dopant may be used at the step of mixing.

Process for preparing p-type thermoelectric material

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Ageo, Japan

Tomoyasu Yano