Nichia Corporation

Sadakazu Wakui

Shoji Hosokawa

Tomokazu Yoshida

Yoshinori Murazaki

Kazuya Nishimata

Kazushige Fujio

Mika Amiya

Toshiyuki Okazaki

Tadayoshi Yanagihara

Shigeki Yoshida

Atul Dnyaneshwar Sontakke

Arnoldus Jacobus Van Bunningen

Andries Meijerink

Disclosed are a production method for a nitride fluorescent material, a nitride fluorescent material and a light emitting device. The production method is for producing a nitride fluorescent material that has, as a fluorescent material core, a calcined body having a composition containing at least one element Mselected from the group consisting of Sr, Ca, Ba and Mg, at least one element Mselected from the group consisting of Li, Na and K, at least one element Mselected from the group consisting of Eu, Ce, Tb and Mn, and Al, and optionally Si, and N, and the method includes preparing a calcined body having the above-mentioned composition, bringing the calcined body into contact with a fluorine-containing substance, and subjecting it to a first heat treatment at a temperature of 100&#xb0; C. or higher and 500&#xb0; C. or lower to form a fluoride-containing first film on the calcined body, and forming on the calcined body, a second film that contains a metal oxide containing at least one metal element Mselected from the group consisting of Si, Al, Ti, Zr, Sn and Zn and subjecting it to a second heat treatment at a temperature in a range of higher than 250&#xb0; C. and 500&#xb0; C. or lower.

Method for producing nitride fluorescent material, nitride fluorescent material and light emitting device

Provided is a light emitting device, comprising: a light emitting element including a light emission peak wavelength in a range of 440 nm or more and 470 nm or less; a first fluorescent material having a light emission peak wavelength in a range of 480 nm or more and 518 nm or less; a second fluorescent material having a light emission peak wavelength in a range of 510 nm or more and less than 590 nm and having an x value of the chromaticity coordinate in CIE1931 in a range of 0.27 or more and 0.40 or less; and a third fluorescent material having a light emission peak wavelength in a range of 590 nm or more and 670 nm or less. The light emitting device is capable of reducing the human eye fatigue and having a light emission spectrum with excellent visual work.

Light emitting device and lighting fixture provided with the same

A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm or more and 490 nm or less, and a red fluorescent material which is excited by the light from the light emitting element to emit light having at least one light emission peak wavelength in a range of 580 nm or more and 680 nm or less, wherein a ratio of the photon flux R of red light in a range of 620 nm or more and 700 nm or less to the photon flux B of blue light in a range of 400 nm or more and 490 nm or less, R/B, is in a range of more than 20 and 200 or less.

Light emitting device and plant cultivation method

Disclosed are a production method for a nitride fluorescent material, a nitride fluorescent material and a light emitting device. The production method is for producing a nitride fluorescent material that has, as a fluorescent material core, a calcined body having a composition containing at least one element Mselected from the group consisting of Sr, Ca, Ba and Mg, at least one element Mselected from the group consisting of Li, Na and K, at least one element Mselected from the group consisting of Eu, Ce, Tb and Mn, and Al, and optionally Si, and N, and the method includes preparing a calcined body having the above-mentioned composition, bringing the calcined body into contact with a fluorine-containing substance, and subjecting it to a first heat treatment at a temperature of 100&#xb0; C. or higher and 500&#xb0; C. or lower to form a fluoride-containing first film on the calcined body, and forming on the calcined body, a second film that contains a metal oxide containing at least one metal element M2 selected from the group consisting of Si, Al, Ti, Zr, Sn and Zn and subjecting it to a second heat treatment at a temperature in a range of higher than 250&#xb0; C. and 500&#xb0; C. or lower.

Provided is a production method of a nitride fluorescent material capable of producing a nitride fluorescent material having a higher emission intensity. The production method is for producing a nitride fluorescent material having a composition containing at least one element Mselected from the group consisting of Sr, Ca, Ba and Mg, at least one element Mselected from the group consisting of Li, Na and K, at least one element Mselected from the group consisting of Eu, Ce, Tb and Mn, and Al and N, which includes subjecting a raw material mixture containing elements constituting the composition of the nitride fluorescent material, along with SrFand/or LiF added thereto as a flux, to a heat treatment, wherein the amount of the flux is in a range of 5.0% by mass or more and 15% by mass or less relative to the total amount, 100% by mass of the raw material mixture and the flux.

Method of producing nitride fluorescent material

A nitride fluorescent material containing at least one element selected from the group consisting of Ca, Sr, Ba and Mg, at least one element selected from the group consisting of Li, Na and K, at least one element selected from the group consisting of Eu, Ce, Tb and Mn, Al and N is provided, wherein when the maximum value of absorbance in 450 cmor more and less than 900 cmis taken as 1 in an FT-IR spectrum, an integrated value Z1 of a domain surrounded by a base line A connecting absorbance values at 1,200 cmand 1,600 cmand an absorbance spectrum of 1,200 cmor more and less than 1,600 cmis 4.0 or less, and/or an integrated value Z2 of a domain surrounded by a base line B connecting absorbance values at 2,700 cmand 3,680 cmand an absorbance spectrum of 2,700 cmor more and less than 3,680 cmis 5.0 or less.

Nitride fluorescent material and light emitting device

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.

Fluoride fluorescent material and light emitting device

A method of producing a nitride fluorescent material having a high light emission intensity and including a calcined product having a composition represented by formula MMMMNis provided. Mis at least one element selected from Sr, Ca, Ba, and Mg; Mis at least one element selected from Li, Na, and K; Mis at least one element selected from Eu, Mn, Tb, and Ce; Mis at least one element selected from Al, B, Ga, and In; v, w, x, y, and z satisfy 0.8&#x2264;v&#x2264;1.1, 0.8&#x2264;w&#x2264;1.1, 0.001&#x3c;x&#x2264;0.1, 2.0&#x2264;y&#x2264;4.0, and 3.0&#x2264;z&#x2264;5.0, respectively. The nitride fluorescent material includes elemental oxygen in a range of 2% or more and 4% or less by mass. The method includes mixing the calcined product with a polar solvent having a relative dielectric constant in a range of 10 or more and 70 or less at 20&#xb0; C.

Method of producing nitride fluorescent material, nitride fluorescent material, and light-emitting device using the same

A method of producing a nitride fluorescent material is provided. The nitride fluorescent material undergoes less change in chromaticity under a high-temperature and high-humidity condition and are excellent in durability. The nitride fluorescent material has a composition containing: at least one element selected from the group consisting of Ca, Sr, Ba, and Mg; at least one element selected from the group consisting of Li, Na, and K; at least one element selected from the group consisting of Eu, Ce, Tb, and Mn; Al; and N. The method includes: preparing a calcined product having the composition, bringing the calcined product in contact with a fluorine-containing substance, and heat-treating the calcined product at a temperature of 200&#xb0; C. or more and 500&#xb0; C. or less. A light emitting device using the nitride fluorescent material is also provided.

Method of producing nitride fluorescent material, nitride fluorescent material, and light emitting device using the same

A light emitting device that includes a light emitting element having a peak emission wavelength at 400-480 nm and a fluorescent member can be provided. The fluorescent member includes a first fluorescent material that includes a nitride containing alkaline-earth metal, alkali metal, aluminum and europium, a second fluorescent material that includes a nitride containing alkaline-earth metal, aluminum, silicon and europium, and a third fluorescent material having a peak emission wavelength in a range of from 500 nm to 560 nm. A content of the first fluorescent material to a total content of the first fluorescent material and the second fluorescent material is from 5% by mass to 95% by mass.

Light emitting device

Fluoride fluorescent material, method for producing the same, and light emitting device

A method for producing a fluoride fluorescent material includes: subjecting a mixture that contains a fluoride compound in a liquid medium to a pressurization treatment and a heating treatment, the fluoride compound having a chemical composition represented by the following formula: A[MMnF]. A is at least one cation selected from the group consisting of K, Li, Na, Rb, Csand NH, M is at least one element selected from the group consisting of Group 4 elements and Group 14 elements, and a is a number that satisfies 0 &#x3c;a &#x3c;0.2. The pressurization treatment is performed at a pressure of 1.5 MPa or higher.

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Tokushima, Japan

Sadakazu Wakui