Shin-etsu Chemical Co., Ltd.

Masami Kaneyoshi

Kazuhiro Wataya

Takehisa Minowa

Masatoshi Ishii

Toshihiro Tsumori

Yasushi Takai

Shigeru Sakai

Noriaki Hamaya

Isamu Fujioka

Kazuyuki Matsumura

Toshihiko Tsukatani

Takao Maeda

Hajime Nakano

Norifumi Yoshida

Hirofumi Kawazoe

Tomoyuki Yamada

Yoshiteru Sakatume

Provided are phosphor particles comprising Mn-doped complex fluoride red phosphor particles and inorganic fine particles which are affixed to the surface of each red phosphor particle. The Mn-doped complex fluoride red phosphor-containing phosphor particles are suppressed in mutual adhesion and agglomeration, flow well during mixing with a silicone or epoxy resin, and have excellent humidity resistance.

Phosphor particles

The present invention relates to a method for producing a hexafluoromanganate(IV), said method being characterized by comprising: inserting an anode and a cathode into a reaction solution that contains a compound containing manganese having an atomic valence of less than 4 and/or manganese having an atomic valence of more than 4 and hydrogen fluoride; and then applying an electric current having an electric current density of 100 to 1000 A/mbetween the anode and the cathode. According to the present invention, it becomes possible to produce a hexafluoromanganate(IV) in which the content ratio of manganese having an atomic valence of 4 is high and the contamination with oxygen is reduced and which has high purity. When a complex fluoride red phosphor is produced using the hexafluoromanganate(IV) as a raw material, the phosphor produced has high luminescence properties, particularly high internal quantum efficiency.

Hexafluoromanganate (IV), complex fluoride phosphor, and methods respectively for producing said products

Provided is a method for producing a phosphor having a chemical composition represented by formula (I), AMF:Mn (I) (A is one type or more of an alkali metal selected from Li, Na, K, Rb, and Cs, and includes at least Na and/or K, and M is one type or more of a tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn.), the method comprising preparing a first hydrofluoric acid solution containing M and a second hydrofluoric acid solution containing A as well as either dissolving a compound containing Mn in either the first hydrofluoric acid solution or the second hydrofluoric acid solution or preparing a separate solution in which the compound containing Mn is dissolved. When the solutions are mixed to precipitate the phosphor of the formula (I), the solutions are mixed so that the concentration of M is 0.1 to 0.5 mol/liter when all the solutions are mixed. According to the present invention, a complex fluoride phosphor having excellent luminescence properties can be produced stably with high yield.

Complex fluoride phosphor and method for producing same

A turn signal for a vehicle has a blue LED as a light source, and an outer cover irradiated by the blue light. The outer cover includes a molded body of a polymeric material including phosphors dispersed therein that absorb blue light and emit light. By means of the present invention, it is possible to provide a turn signal for vehicles which has improved visibility and which imparts excellent visibility and sufficient luminous intensity over a wide angle. Further, because the entire outer cover surface-emits light, uniformity of luminous intensity is ensured without subjecting the outer cover to light scattering treatment, enabling as a result preventing glare caused by light scattering treatment, making this turn signal safe without being unpleasant for pedestrians and drivers of nearby vehicles. Furthermore, because no complex optical design is necessary, this turn signal saves space and can be arranged in a vehicle.

Turn signal for vehicle

Provided is a method of producing a Mn-activated complex fluoride phosphor, the method including: mixing a red phosphor as a Mn-activated complex fluoride represented by the following formula (1):KMF:Mn&#x2003;&#x2003;(1)wherein M is one or two or more of tetravalent elements selected from the group consisting of Si, Ti, Zr, Hf, Ge and Sn and necessarily includes Si, with KMnFin solid state and optionally with a hydrogenfluoride represented by the following formula (2):AF.HF&#x2003;&#x2003;(2)wherein A is one or two or more of alkali metals and/or ammonium selected from the group consisting of Li, Na, K, Rb and NHand necessarily includes K, and n is a number of 0.7 to 4, in solid state; and heating the resulting mixture at a temperature of 100 to 500&#xb0; C. According to the present invention, it is possible to obtain a Mn-activated complex fluoride phosphor which can be used with smaller amount as compared to those according to the related art.

Mn-activated complex fluoride phosphor and method of producing thereof

Provided is a method for producing a red phosphor which is a Mn-activated complex fluoride represented by formula (1), AMF:Mn (1) (M is one type or more of a tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn, and A is one type or more of an alkali metal selected from Li, Na, K, Rb, and Cs, and includes at least Na and/or K.), wherein, as a reactive source, a solid of a complex fluoride represented by formula (2), AMF(2) (M and A are as described above) and a solid of a manganese compound represented by formula (3), AMnF(3) (A is as described above) are mixed and heated at a temperature of from 100&#xb0; C. to 500&#xb0; C. According to the present invention, a Mn-activated complex fluoride phosphor having favorable luminescence properties can be obtained without using hydrofluoric acid in a main step.

Method for producing and method for processing complex fluoride phosphor

Disclosed is an adjustment component that: includes a complex fluoride fluorophore represented by A(MMn)F(in the formula: M is one or two or more of type of tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn; A is one or two or more of type of alkali metal selected from Li, Na, K, Rb, and Cs and including at least Na and/or K; and x is from 0.001 to 0.3); and adjusts the chromaticity and/or color rendering index of illumination light by absorbing light having a wavelength of from 420 nm to 490 nm inclusive, and emitting light including a red wavelength component.

Adjustment component and light-emitting device

A wavelength conversion member which is a resin-molded article made of at least one type of thermoplastic resin selected from polyolefins, polystyrene, styrene copolymers, fluorocarbon resins, acrylic resins, nylons, polyester resins, polycarbonate resins, vinyl chloride resins, and polyether resins. The thermoplastic resin contains less than or equal to 30 mass % of a complex fluoride fluorophore represented by A(MMn)F(M is at least one type of tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn; A is at least one type of alkali metal selected from Li, Na, K, Rb, and Cs and including at least Na and/or K; and x is from 0.001 to 0.3) and having a particle diameter D, which is the median diameter at a cumulative volume of 50% in particle size distribution, of from 2 &#x3bc;m to 200 &#x3bc;m inclusive. The complex fluoride fluorophore being dispersed in the thermoplasticresin.

Wavelength conversion member and light-emitting device

Disclosed is a wavelength conversion member which is a resin-molded article having dispersed therein a complex fluoride fluorophore that absorbs light with a blue wavelength component and emits light including a red wavelength component and that is represented by A(MMn)F(in the formula: M is at least one type of tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn; A is at least one type of alkali metal selected from Li, Na, K, Rb, and Cs and including at least Na and/or K; and x is from 0.001 to 0.3), wherein the hue of the wavelength conversion member when light is not emitted is as follows in CIELAB (CIE 1976): L*=from 40 to 60 inclusive; a*=from 0 to +1 inclusive; and b*=from +2 to +15 inclusive.

A method for treating a Mn-activated complex fluoride phosphor is provided wherein a preliminarily-prepared red phosphor of a Mn-activated complex fluoride represented by the following formula (1):AMF:Mn&#x2003;&#x2003;(1)wherein M represents at least one tetravalent element selected from Si, Ti, Zr, Hf, Ge and Sn, A represents at least one alkali metal selected from Li, Na, K, Rb and Cs provided that at least Na and/or K is contained, is heated in a substantially oxygen atom-free gas but containing a fluorine atom at a temperature of at least 50&#xb0; C.

Method for treating Mn-activated complex fluoride phosphor

A red phosphor in the form of a Mn-activated complex fluoride having the formula: AMF:Mn wherein M is one or more tetravalent elements selected from Si, Ti, Zr, Hf, Ge, and Sn, and A is one or more alkali metals selected from Li, Na, K, Rb, and Cs, and contains at least Na and/or K, is surface treated with a treating solution containing a surface treating agent selected from an organic amine, quaternary ammonium salt, alkyl betaine or fluorochemical surfactant, alkoxysilane, and fluorinated polymer.

Phosphor surface treatment method

A complex fluoride AMFwherein M is a tetravalent element Si, Ti, Zr, Hf, Ge or Sn, A is an alkali metal Li, Na, K, Rb or Cs is prepared by providing a first solution containing a fluoride of M, providing a second solution containing a compound of A and/or the compound of A in solid form, mixing the first solution with the second solution and/or the solid for reacting the fluoride of M with the compound of A, and recovering the resulting solid product via solid-liquid separation.

Preparation of complex fluoride and complex fluoride phosphor

Oxo-acid salts, halogenated oxo-acid salts, double oxides or complex oxides contain 0.001-10 atom % of Zr or Hf and 0.001-5 atom % of Mn. They emit radiation in the visible range of 390-750 nm when excited with vacuum-ultraviolet radiation.

Zirconium or hafnium and manganese-containing oxides

Oxo-acid salts, double oxides or complex oxides contain 0.001-10 atom % of Zr or Hf. They emit near-ultraviolet radiation when excited with vacuum-ultraviolet radiation.

Zirconium or hafnium-containing oxides

A rare earth phosphate represented by the formula: RPOwherein R is a rare earth element selected from Sc, Y, and lanthanoids of atomic numbers 57 to 71, wherein Mn substitutes for 0.01-15 atom % of R emits blue light when excited by vacuum-UV radiation.

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Echizen, Japan

Masami Kaneyoshi