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1. 发明公开

EP3780023A1 IRON-BASED OXIDE MAGNETIC POWDER AND METHOD FOR PRODUCING SAME 审中-公开
公开(公告)号：EP3780023A1
公开(公告)日：2021-02-17
申请号：EP19776115.8
申请日：2019-03-26
申请人： The University of Tokyo , DOWA Electronics Materials Co., Ltd.
发明人： OHKOSHI, Shin-ichi , NAMAI, Asuka , SAKANE, Kenji , KAWAHITO, Tetsuya
IPC分类号： H01F1/11 , C01G49/00 , C01G49/06
摘要： [Problem] To provide a method for producing iron based oxide magnetic powder that has a narrow particle size distribution and a small content of fine particles that do not contribute to the magnetic recording characteristics, and consequently has a narrow coercive force distribution and is suitable for the enhancement of the recording density of the magnetic recording medium. [Solution] ε-Type iron based oxide magnetic powder is obtained by a wet method, then a tetraalkylammonium salt as a surface modifier is added to a slurry containing the magnetic powder to make a concentration of 0.009 mol/kg or more and 1.0 mol/kg or less, and simultaneously to make pH of 11 or more and 14 or less, and the slurry is subjected to a dispersion treatment and then classified, so as to provide iron based oxide magnetic powder having a narrow particle size distribution and a narrow coercive force distribution.

2. 发明公开

EP2067840A1 FLUORESCENT SUBSTANCE, FLUORESCENT SHEETS, PROCESS FOR PRODUCTION OF THE FLUORESCENT SUBSTANCE, AND LIGHT-EMITTING DEVICES MADE BY USING THE SUBSTANCE 有权转让
标题翻译：荧光物质，荧光膜，工艺用于生产荧光物质和物质使用MACH END照明灯装置
公开(公告)号：EP2067840A1
公开(公告)日：2009-06-10
申请号：EP07807692.4
申请日：2007-09-21
申请人： DOWA Electronics Materials Co., Ltd.
发明人： GOTOH,Masahiro , SAKANE, Kenji
IPC分类号： C09K11/64 , C09K11/08 , H01J29/20
CPC分类号： C09K11/7734 , C09K11/0883
摘要： To provide a phosphor given by a general composition formula expressed by MmAaBbOoNn:Z, (wherein element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is one or more kinds of activating agent, satisfying m > 0, a > 0, b > 0, o ≥ 0, and n > 0), with a change rate of a ratio of element B atoms to the total numbers of atoms being smaller by 10% or the change rate of oxygen atoms to the total numbers of atoms being smaller by 40% in a range from a particle surface up to depth 2000nm, having a broad emission spectrum in a range of blue color, having a broad flat excitation band in a range of near ultraviolet/ultraviolet, and having excellent emission efficiency, emission intensity, and luminance.
摘要翻译：提供一种通过由MmAaBbOoNn过表达的组成通式给出的磷光体：Z，（worin元素M是具有二价化合价的元素的一种或多种，A元素是具有三价化合价的元素的一种或两种以上，B元素是一种或多种种具有四价的化合价的元素，O是氧，N是氮，Z元素是活化剂，m> 0，a> 0时，b> 0，邻‰¥0的一种或多种，并且n> 0）与元件B原子的比例的变化率，以原子为的总数的10％更小的原子或氧原子的变化率的原子在一个范围内的40％更小的总数从颗粒表面到深度2000nm的，具有范围蓝色的宽的发射光谱，具有宽且平坦的激发范围近紫外/紫外的捆绑，并且具有优异的发光效率，发光强度，亮度和。

3. 发明授权

EP2075312B1 MANUFACTURING METHOD OF NITRIDE PHOSPHOR OR OXYNITRIDE PHOSPHOR 有权转让
标题翻译： HERSTELLUNGSVERFAHRENFÜRNITRID-LEUCHTSTOFF ODER OXYNITRID-LEUCHTSTOFF
公开(公告)号：EP2075312B1
公开(公告)日：2013-03-06
申请号：EP07806968.9
申请日：2007-09-07
申请人： DOWA Electronics Materials Co., Ltd.
发明人： GOTOH, Masahiro , SAKANE, Kenji
IPC分类号： C09K11/64
CPC分类号： C09K11/7734 , C04B35/597 , C04B35/6262 , C04B2235/3224 , C04B2235/3852 , C04B2235/3865 , C04B2235/3873 , C04B2235/3895 , C04B2235/5436 , C09K11/0883

4. 发明公开

EP1790709A1 ELECTRON BEAM EXCITED PHOSPHOR OR PHOSPHOR FILM AND COLOR DISPLAY UNIT UTILIZING THE SAME 有权转让
标题翻译： ELEKTRONSTRAHLANGEREGTER磷光体磷光体在达拉斯基地的FARBDISPLAYEINHEIT
公开(公告)号：EP1790709A1
公开(公告)日：2007-05-30
申请号：EP05767083.8
申请日：2005-07-28
申请人： DOWA Electronics Materials Co., Ltd.
发明人： GOTOH, Masahiro , NAGATOMI, Akira , SAKANE, Kenji , YAMASHITA, Shuji
IPC分类号： C09K11/64
CPC分类号： C04B35/581 , C04B35/584 , C04B35/6262 , C04B2235/3224 , C04B2235/3852 , C04B2235/3865 , C04B2235/3873 , C04B2235/5436 , C09K11/0883 , C09K11/7734 , H01J29/20 , H01J2329/00
摘要： To provide a phosphor for an electron beam excitation with a small deterioration in an emission efficiency and capable of maintaining a high luminance, even when an excitation density of an electron beam for a phosphor excitation is increased. As raw materials, Ca 3 N 2 (2N), AlN(3N), Si 3 N 4 (3N), and Eu 2 O 3 (3N) are prepared, and the raw materials thus prepared are measured and mixed, so that a molar ratio of each element becomes (Ca + Eu) : Al : Si = 1 : 1 : 1. Then, the mixture thus obtained is maintained and fired for at 1500°C for 3 hours, and thereafter crushed, to manufacture the phosphor having a composition formula Ca 0.985 SiAlN 3 :Eu 0.015 .
摘要翻译：即使当荧光体激发的电子束的激发密度增加时，为了提供发射效率小的劣化并能够保持高亮度的电子束激发用荧光体。作为原料，制备Ca 3 N 2（2N），AlN（3N），Si 3 N 4（3N）和Eu 2 O 3（3N），并测量并混合如此制备的原料，使得每个元素的摩尔比变为（Ca + Eu）：Al:Si = 1:1:1。然后，将如此获得的混合物在1500℃下保持3小时，然后粉碎，制造具有组成式Ca 0.985 SiAlN 3：Eu 0.015。

5. 发明公开

EP2075312A1 PROCESS FOR PRODUCING NITRIDE PHOSPHOR OR OXONITRIDE PHOSPHOR 有权转让
标题翻译： PROCESS氮化物荧光体，氧氮化物荧光物质
公开(公告)号：EP2075312A1
公开(公告)日：2009-07-01
申请号：EP07806968.9
申请日：2007-09-07
申请人： DOWA Electronics Materials Co., Ltd.
发明人： GOTOH, Masahiro , SAKANE, Kenji
IPC分类号： C09K11/08 , C09K11/64
CPC分类号： C09K11/7734 , C04B35/597 , C04B35/6262 , C04B2235/3224 , C04B2235/3852 , C04B2235/3865 , C04B2235/3873 , C04B2235/3895 , C04B2235/5436 , C09K11/0883
摘要： To reduce impurity contents of carbon and oxygen not contributing to light emission, then suppress deterioration of emission intensity of a phosphor, and improve emission efficiency of this phosphor. Therefore, there is provided a firing method of nitride or oxynitride phosphors, wherein a crucible 11 made of nitride is used as a firing container, and firing is performed, with this crucible covered with a lid (container 10), to manufacture the phosphor. The phosphor is expressed by a general composition formula MABO o N 3-2/3o :Z in which element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is an activating agent, satisfying o ≥ 0.

6. 发明公开

EP4039650A1 IRON-BASED OXIDE MAGNETIC POWDER AND METHOD FOR MANUFACTURING SAME 有权
公开(公告)号：EP4039650A1
公开(公告)日：2022-08-10
申请号：EP20872860.0
申请日：2020-09-29
申请人： The University of Tokyo , Dowa Holdings Co., Ltd.
发明人： OHKOSHI, Shin-ichi , NAMAI, Asuka , TOKORO, Hiroko , YOSHIKIYO, Marie , YAMAGA, Kazuhiro , MIYAMOTO, Yasuto , MINEYAMA, Yuki , SAKANE, Kenji , KAWAHITO, Tetsuya
IPC分类号： C01G51/00 , G11B5/706 , G11B5/714 , G11B5/84 , C01G49/00 , H01F1/11
摘要： [Object] To provide an iron-based oxide magnetic powder, which has a sufficiently reduced content of fine particles and coarse particles, has a particle shape close to a perfect sphere, and is suitable for use in a magnetic recording medium.
[Means for Solution] A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system to 1.0 or higher and 3.0 or lower, a hydroxycarboxylic acid is added to the obtained reaction solution and thereafter the pH of the reaction system is neutralized to 7.0 or higher and 10.0 or lower, and the obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified.

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