Nichia Corporation

Dai Nippon Printing Co., Ltd.

Tomokazu Yoshida

Shoji Hosokawa

Kazuya Nishimata

Suguru Takashima

Seitaro Akagawa

Sadakazu Wakui

Shozo Taketomi

Toshiyuki Okazaki

Masafumi Sakamoto

Naoto Kijima

Atsushi Yamamoto

Saiki Yamamoto

Yuki Shiota

Seiji Tawaraya

Kazuyuki Hino

Keisho Yamashita

Yohei Yamauchi

A method for producing a fluoride fluorescent material comprises: preparing fluoride particles having a composition containing at least one element or ion A selected from the group consisting of alkaline metal elements and NH, at least one element M selected from the group consisting of Group-4 elements and Group-14 elements, Mn, and F, in which a molar ratio of A in 1 mol of the composition is 2, a total molar ratio of M and Mnis 1, a molar ratio of Mnis in a range of more than 0 and less than 0.2, and a molar ratio of F is 6; subjecting the fluoride particles to a first heat treatment at a temperature of 500° C. or more in an inert gas atmosphere; washing the first heat-treated fluoride particles with a washing liquid; and bringing the washed fluoride particles into contact with a fluorine-containing substance and subjecting the resulting fluoride particles to a second heat treatment at a temperature of 400° C. or more.

Method for producing fluoride fluorescent material

A wavelength conversion member including a wavelength conversion layer containing a fluoride phosphor, quantum dots, a surfactant, and a resin. The fluoride phosphor contains fluoride particles having a specific composition and having particle size values within specific ranges. The quantum dots include at least one selected from a first crystalline nanoparticle and a second crystalline nanoparticle. The first crystalline nanoparticle has a specific composition. When irradiated with light having a wavelength of 450 nm, the first crystalline nanoparticle emits light having an emission peak at a wavelength in a range from 510 nm to 535 nm, and a full width at half maximum of the emission peak of the first crystalline nanoparticle is in a range from 10 nm to 30 nm. The second crystalline nanoparticle includes a chalcopyrite-type crystalline structure, and a full width at half maximum of the emission peak of the second crystalline nanoparticle is 45 nm or less.

Wavelength conversion member, light-emitting device, and image display device

A method for producing a fluoride fluorescent material comprises: preparing fluoride particles having a composition containing at least one element or ion A selected from the group consisting of alkaline metal elements and NH, at least one element M selected from the group consisting of Group-4 elements and Group-14 elements, Mn, and F, in which a molar ratio of A in 1 mol of the composition is 2, a total molar ratio of M and Mnis 1, a molar ratio of Mnis in a range of more than 0 and less than 0.2, and a molar ratio of F is 6; subjecting the fluoride particles to a first heat treatment at a temperature of 500&#xb0; C. or more in an inert gas atmosphere; washing the first heat-treated fluoride particles with a washing liquid; and bringing the washed fluoride particles into contact with a fluorine-containing substance and subjecting the resulting fluoride particles to a second heat treatment at a temperature of 400&#xb0; C. or more.

Provided is a fluoride fluorescent material having high luminance. The fluoride fluorescent material has a composition containing Mn, A that is at least one element or ion selected from the group consisting of alkali metal elements and NH, at least one element M selected from the group consisting of Group-4 elements and Group-14 elements, and F; and contains spherical fluoride particles.

Fluoride fluorescent material, light emitting device, and method for producing fluoride fluorescent material

A fluoride fluorescent material includes a composition including K, Ge, Mn, and F and having a molar ratio of K of 2, a total molar ratio of Ge and Mnof 1, a molar ratio of Mnof more than 0 and less than 0.2, and a molar ratio of F of 6 in 1 mol of the composition, has a light emission spectrum having a first light emission peak in a range of 615 nm or more and less than 625 nm having a full width at half maximum of 6 nm or less, and a second light emission peak in a range of 625 nm or more and less than 635 nm, and has an internal quantum of 85% or more efficiency under excitation of light having a wavelength of 450 nm.

Provided are a method of producing an aluminate fluorescent material, an aluminate fluorescent material and a light emitting device. The production method includes heat-treating a mixture prepared by mixing a compound containing at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, a Mg-containing compound not acting as a flux, a Mn-containing compound, an Al-containing compound, a first flux containing at least one alkali metal element selected from the group consisting of Na, K, Rb and Cs, and a Mg-containing second flux to give an aluminate fluorescent material.

Method of producing aluminate fluorescent material, aluminate fluorescent material and light emitting device

The present invention provides a method for producing a fluoride fluorescent material, comprising: contacting a fluoride particles represented by the following general formula (I):K[MMnF]&#x2003;&#x2003;(I)wherein M is at least one member selected from the group consisting of elements belonging to Groups 4 and 14 of the Periodic Table, and a satisfies the relationship: 0&#x3c;a&#x3c;0.2; with a solution containing alkaline earth metal ions in the presence of a reducing agent to form an alkaline earth metal fluoride and less than tetravalent manganese ions on the surface of the fluoride particles.

Fluoride fluorescent material and method for producing the same as well as light emitting device using the same

Provided are an aluminate fluorescent material, a light emitting device, and a method for producing an aluminate fluorescent material. The aluminate fluorescent material, having an aluminate composition containing: at least one alkaline earth metal element selected from the group consisting of Ba, Sr, and Ca; Mn; and optionally Eu and/or Mg, wherein the fluorine content in the aluminate fluorescent material is 100 ppm or more and 7,000 ppm or less, and the average particle diameter of the aluminate fluorescent material, which is measured according to a Fisher Sub-Sieve Sizer method, is 8 &#x3bc;m or more.

Aluminate fluorescent material, light emitting device, and method for producing aluminate fluorescent material

Provided is an aluminate fluorescent material having a high emission intensity and having a composition containing a first element that contains one or more of Ba and Sr, and a second element that contains Mg and Mn. In the composition, when a molar ratio of Al is 10, a total molar ratio of the first element is a parameter a, a total molar ratio of the second element is a parameter b, a molar ratio of Sr is a product of a parameter m and the parameter a, a molar ratio of Mn is a product of a parameter n and the parameter b. The parameters a and b satisfy 0.5&#x3c;b&#x3c;a&#x2264;0.5b+0.5&#x3c;1.0, the parameter m satisfies 0&#x2264;m&#x2264;1.0, and the parameter n satisfies 0.4&#x2264;n&#x2264;0.7.

Aluminate fluorescent material, light emitting device using the same, and method of producing aluminate fluorescent material

Disclosed are a method of producing an aluminate fluorescent material, such an aluminate fluorescent material, and a light emitting device. The aluminate fluorescent material production method includes: subjecting a first mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, and at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, in which a compound containing Mg may be optionally mixed, to first heat treatment to give a first calcined product having an average particle diameter D, as measured according to a Fisher Sub-Sieve Sizer method, of 6 &#x3bc;m or more; and subjecting a second mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, and the first calcined product whose content is 10% by mass or more and 90% by mass or less relative to the total amount of the second mixture, in which a compound containing Mg may be optionally mixed, to second heat treatment to give a second calcined product.

Method of producing aluminate fluorescent material, aluminate fluorescent material, and light emitting device

Provided is a light-emitting device including a light-emitting element having a peak emission wavelength in a range of from 400 nm to 470 nm, and a fluorescent member including a first fluorescent material including an aluminate that contains Mg, Mn, and at least one alkali earth metal selected from the group consisting of Ba, Sr, and Ca, a second fluorescent material having a different composition from the first fluorescent material, and a third fluorescent material. The first, second and third fluorescent materials have a peak emission wavelength in a range of from 510 nm to 525 nm, from 510 nm to 550 nm, and from 620 nm to 670 nm, respectively.

Light-emitting device

Disclosed are an aluminate fluorescent material having a high light emission intensity, and a light emitting device using the same. The aluminate fluorescent material includes a composition represented by the following formula (I).XEuMgMnAlO&#x2003;&#x2003;(I)

Aluminate fluorescent material and light emitting device

Disclosed are an aluminate fluorescent material having a high light emission intensity, and a light emitting device using the same. The aluminate fluorescent material includes a composition represented by the following formula (I):XEuMgMnAlO&#x2003;&#x2003;(I)

A method for producing a fluoride fluorescent material including: preparing a first solution containing manganese, a second solution containing at least one cation selected from the group consisting of K, Li, Na, Rb, Cs, and NH, and a third solution containing at least one element selected from the group consisting of the elements from Groups 4 and 14 of the periodic table, and adding the first and third solutions dropwise, each at a rate of 0.3% or less of the total volume of the solution per minute to the second solution to obtain particles having a composition represented by formula (I): A[MMnF] (I) wherein A denotes at least one cation selected from the group consisting of K, Li, Na, Rb, Cs, and NH; M denotes at least one element selected from the group consisting of the elements from Groups 4 and 14 of the periodic table; and a satisfies 0.04&#x3c;a&#x3c;0.20.

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Anan, Japan

Tomokazu Yoshida