Sumitomo Chemical Company, Limited

National Institute of Advanced Industrial Science and Technology

Keiji Ono

Susumu Miyazaki

Takashi Takeda

Kenji Toda

Tadashi Endo

Kyota Ueda

Mineo Sato

Mikio Kobayashi

Takayoshi Ezuhara

Yoshihiro Nishisu

Toshinori Isobe

Takashi 2-5-10-801 Suisha-Machi Takeda

A phosphor having a high brightness after being exposed to plasma and a phosphor paste containing the phosphor. The phosphor comprises a fluorescent substance Acontaining a compound represented by the following formula (I) and at least one activator selected from the group consisting of Eu and Mn, and a fluorescent substance Bcontaining an aluminate;mMO.nMO.2MO&#x2003;&#x2003;(I)[in the formula (I), Mis at least two selected from the group consisting of Ca, Sr and Ba, or Ca alone or Ba alone; Mis at least one selected from the group consisting of Mg and Zn; Mis at least one selected from the group consisting of Si and Ge; 0.5&#x2266;m&#x2266;3.5; and 0.5&#x2266;n&#x2266;2.5].

Phosphor and phosphor paste

A phosphor and a vacuum ultraviolet excited light-emitting device are disclosed. The phosphor comprises a compound represented by the following formula (1)CaSrEuMgSiO&#x2003;&#x2003;(1)wherein 0.1&#x3c;a&#x2266;0.35 and 0.003&#x2266;b&#x2266;0.02. The phosphor is excited by vacuum ultraviolet and emits blue light with high brightness. The vacuum ultraviolet excited light-emitting device comprises the above phosphor.

Phosphor and vacuum ultraviolet excited light-emitting device

A process for producing a vacuum ultraviolet ray-excited light-emitting phosphor comprising the steps of

Process for producing light-emitting phosphor

A phosphor layer having a high luminance, and a vacuum ultra-violet radiation excited light emitting element are provided. A phosphor layer having a voidage of not less than 60 vol %, the phosphor layer in which a phosphor having a BET specific surface area of not less than 3 m/g is used, and a vacuum ultra-violet radiation excited light emitting element are provided.

High voidage phosphor layer and vacuum UV excited light emitting element

The object of the present invention is to provide a process for producing particles of a metal compound having a spherical particle shape and an average particle diameter larger than 0.3 &#x3bc;m without employing high-pressure conditions. This object is achieved by a process for producing particle of a metal compound comprising a step of adjusting pH of an aqueous solution containing urea and at least one metal element to from 4 to 8, a step of heating the aqueous solution under normal pressure, a step of separating a solid from the solution, and a step of drying the solid.

Process for producing particles of a metal compound

The object of the present invention is to provide a production method for a silicate phosphor having high brightness. This object is achieved by the method for producing a silicate phosphor comprising a step of calcining a mixture of metal compounds, wherein one of the metal compounds is silicon oxide having BET specific surface area of not less than 10 m/g.

Method for producing silicate phosphor

A fluorescent substance for vacuum ultraviolet radiation excited light-emitting devices which emits light with a high luminance and is subject to only a small decrease in luminance due to exposure to plasma or the like, and a vacuum ultraviolet radiation excited light-emitting device including the fluorescent substance are provided. The fluorescent substance is represented by the general formula: mM O&middot;nM O&middot;2M O wherein M is at least one metal selected from the group consisting of Ca, Sr and Ba, M is at least one metal selected from the group consisting of Mg and Zn, M is at least one metal selected from the group consisting of Si and Ge, and m and n satisfy 0.5&lE;m&lE;3.5 and 0.5&lE;n&lE;2.5, respectively. Either Eu and Mn can be used as an activator.

Fluorescent substances for vacuum ultraviolet radiation excited light-emitting devices

It is desired to provide an aluminate phosphor having a high emission luminance, a method for producing the same, and a vacuum ultra-violet radiation excited light emitting element in which the aluminate phosphor is used. A method for producing an aluminate phosphor by mixing an &agr;-alumina powder, an aqueous solution containing a cation of a metal composing the aluminate phosphor, and a precipitant that precipitates the cation, and drying and calcining an obtained mixture of precipitates is provided. The foregoing method is further arranged so that the cation is a cation of at least one metal selected from the group consisting of Ba, Mg, Eu, Mn, Sr, Ca, Tb, Ce, and Zn is provided. An aluminate phosphor in which particles of the aluminate phosphor having a primary particle diameter of 0.05 &mgr;m to 30 &mgr;m account for not less than 80 percent by mass is provided by the foregoing method.

Method of producing aluminate phosphor

A method of producing an aluminate fluorescent substance, a fluorescent substance and a device containing a fluorescent substance. The method includes the steps of mixing an &agr;-alumina powder having an average primary particle size of from about 0.05 &mgr;m to less than 0.3 &mgr;m with a metal salt, and calcining the resulting mixture.

Method of producing aluminate fluorescent substance, a fluorescent substance and a diode containing a fluorescent substance

Phosphor for vacuum ultraviolet excitation material

A method for producing a barium-containing composite metal oxide, comprising calcining a mixture of a barium compound and a metal compound comprising at least one metal selected from the group consisting of magnesium, aluminum, europium, manganese, strontium, calcium, terbium, zinc and titanium, or calcining a barium-containing composite metal salt comprising barium and at least one metal selected from the group consisting of magnesium, aluminum, europium, manganese, strontium, calcium, terbium, zinc and titanium, in a gas comprising a hydrogen halide and water vapor.

Method of producing barium-containing composite metal oxide

A phosphor for a vacuum ultraviolet excited light emitting device, obtained (1) by adding Eu or Tb as an activating agent to a substrate comprising a compound represented by the general formula M M M O , wherein M represents at least one element selected from Na and Li, M represents at least one element selected from Gd and Y, and M at least one element selected from Ge and Si; (2) by adding Eu as an activating agent to a substrate comprising a compound containing SrO, Al O and B O ; or (3) by adding Eu or Tb as an activating agent to a substrate comprising a compound represented by the general formula M O CN , wherein M represents at least one element selected from La, Y and Gd.

Phosphor for vacuum ultraviolet excited light emitting device

A vacuum ultraviolet ray-excited light-emitting phosphor comprising a compound represented by formula (Ba M ) Mg Al O as a substrate, and Eu as an activator, wherein M represents Ca, Sr, or Ca and Sr, x and y satisfy the following relations, 0.5&lE;x&lE;1, and 0.05&lE;y&lE;0.15.

Vacuum ultraviolet ray-excited light-emitting phosphor

The present invention provides a method for producing an aluminate-based phosphor or a luminescent aluminate-based phosphor, which comprises calcining an aluminum compound having a BET specific surface area of 100 m /g or more.

Process for producing aluminate-based phosphor

A phosphor for a vacuum ultraviolet ray-exciting light-emitting element, comprising Eu as an activator, and aluminates having a magnetoplumbite structure.

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Tsukuba, Japan

Keiji Ono