Ube Industries, Inc.

Takayuki Ueda

Masataka Fujinaga

Shinsuke Jida

Takuma Sakai

Kazuki Iwashita

Takafumi Kawano

Mao Sumino

Masataka Yamanaga

Yuki Nagao

An oxynitride phosphor powder has a fluorescence peak wavelength of 587 to 630 nm and a high external quantum efficiency. A method of producing the oxynitride phosphor powder containing Li at 50 to 10,000 ppm includes mixing silicon nitride powder, a substance serving as an aluminum source, a substance serving as a calcium source and a substance serving as an europium source; firing the mixture at 1500 to 2000&#xb0; C. in an inert gas atmosphere or a reducing gas atmosphere to obtain a fired oxynitride phosphor composed mainly of Ca-containing &#x3b1;-SiAlON, as an intermediate; and heat treating the fired oxynitride phosphor at a temperature of 1450&#xb0; C. to less than the firing temperature, in an inert gas atmosphere or in a reducing gas atmosphere in the presence of Li.

Oxynitride phosphor powder and method for producing same

An oxynitride phosphor powder contains &#x3b1;-SiAlON and aluminum nitride, obtained by mixing a silicon source, an aluminum source, a calcium source, and a europium source to produce a composition represented by a compositional formula: CaEuSiAlON(wherein x1, x2, y and z are 0&#x3c;x1&#x2266;3.40, 0.05&#x2266;x2&#x2266;0.20, 4.0&#x2266;y&#x2266;7.0, and 0&#x2266;z&#x2266;1), and firing the mixture.

Oxynitride phosphor powder, silicon nitride powder for production of oxynitride phosphor powder, and production method of oxynitride phosphor powder

A method of manufacturing a wavelength conversion member including a polycrystalline ceramics includes mixing a substance serving as a silicon source, a substance serving as an aluminum source, a substance serving as a calcium source, and a substance serving as a europium source; firing the obtained mixture to obtain an oxynitride phosphor powder; then sintering the oxynitride phosphor powder in an inert atmosphere to obtain the polycrystalline ceramics, characterized in that the sintered oxynitride phosphor powder has a composition (excluding oxygen) represented by the Formula: CaEuSiAlON(in the Formula, x1, x2, y, and z are values such that 0&#x3c;x1&#x2266;3.40, 0.05&#x2266;x2&#x2266;0.20, 3.5&#x2266;y&#x2266;7.0, 0&#x2266;z&#x2266;1).

Wavelength conversion member and light-emitting device employing same

An oxynitride phosphor power has a fluorescence peak wavelength of 580 to 605 nm, the oxynitride phosphor having a higher external quantum efficiency than ever before. The oxynitride phosphor powder is an oxynitride phosphor powder containing &#x3b1;-SiAlON and aluminum nitride, represented by composition formula:CaEuSiAlONwherein x1, x2, y and z are 0&#x3c;x1&#x2266;2.50, 0.01&#x2266;x2&#x2266;0.20, 0&#x3c;y&#x2266;2.3 and 1.5&#x2266;z&#x2266;3.5, or x1, x2, y and z are 0&#x3c;x1&#x2266;2.70, 0.05&#x2266;x2&#x2266;0.20, 2.3&#x2266;y&#x2266;5.5 and 1&#x2266;z&#x2266;2.5.

Oxynitride phosphor powder

Provided are a crystalline silicon nitride powder for a siliconitride phosphors, which is used as a starting material for producing a siliconitride phosphor containing a silicon element and a nitrogen element but no oxygen element as a constitutent element, an oxygen content of the silicon nitride phosphor being 0.2-0.8 wt %; a CaAlSiNphosphor, an SrSiNphosphor, an (Sr, Ca)AlSiNphosphor and an LaSiNphosphor, each using the silicon nitride powder; and a method for producing the phosphors.

[object Object]

A method for producing an &#x3b1;-sialon-based oxynitride phosphor includes a mixed powder blended such that the product is represented by the formula: MSiAlON:Ln(wherein M is at least one metal selected from Li, Ca, Mg, Y and a lanthanide metal excluding La and Ce, Ln is at least one lanthanide metal selected from Eu, Dy, Er, Tb and Yb), the mixed powder containing an amorphous silicon nitride powder having an loose bulk density of 0.16 to 0.22 g/cm, and is fired at 1,400 to 2,000&#xb0; C. in a nitrogen-containing inert gas atmosphere.

Growing community of inventors

Ube, Japan

Takayuki Ueda