Abstract: A method of producing a nitride fluorescent material including a step of first heat-treating a first compound containing at least one alkaline earth metal element selected from the group consisting of Ba, Sr, Ca and Mg, a second compound containing at least one element selected from the group consisting of Eu, Ce, Tb and Mn, and a Si-containing compound, in an atmosphere containing nitrogen to obtain a calcined product of raw materials, and a step of second heat-treating the calcined product of raw materials, a Ba-containing compound, a Si-containing compound, and optionally a third compound containing at least one element selected from the group consisting of Eu, Ce, Tb and Mn, and optionally a fourth compound containing at least one alkaline earth metal element selected from the group consisting of Sr, Ca and Mg, in an atmosphere containing nitrogen to obtain a nitride fluorescent material is provided, wherein the ratio of the charge-in molar amount of Ba to the total charge-in molar amount of at least one

Abstract: Provided is a method of producing a nitride fluorescent material containing silicon nitride particles containing Eu, at least one alkaline earth metal selected from the group consisting of Mg, Ca, Sr, and Ba, Al, and fluorine in a composition of the silicon nitride particles. The method includes heat treating a raw material mixture containing an Eu source, a source of the alkaline earth metal, an Al source, an Si source, and an alkaline earth metal fluoride containing at least one selected from the group consisting of Mg, Ca, Sr, and Ba, wherein a molar content ratio of fluorine atom to Al is from 0.02 to 0.3.

Abstract: Provided are a method for producing a ceramic sintered body having improved light emission intensity, a ceramic sintered body, and a light emitting device. The method for producing a ceramic sintered body comprises preparing a molded body that contains a nitride fluorescent material having a composition containing: at least one alkaline earth metal element M1 selected from the group consisting of Ba, Sr, Ca, and Mg; at least one metal element M2 selected from the group consisting of Eu, Ce, Tb, and Mn; Si; and N, wherein a total molar ratio of the alkaline earth metal element M1 and the metal element M2 in 1 mol of the composition is 2, a molar ratio of the metal element M2 is a product of 2 and a parameter y and wherein y is in a range of 0.001 or more and less than 0.

Abstract: A method for producing a nitride fluorescent material having high emission luminance can be provided. The method includes heat-treating a raw material mixture containing silicon nitride, silicon, an aluminium compound, a calcium compound, and a europium compound.

Abstract: Provided are a chlorosilicate fluorescent material having high light emission efficiency, a method for producing the same, and a light emitting device. In certain embodiments, the chlorosilicate fluorescent material has a chemical composition comprising Ca, Eu, Mg, Si, O, and Cl, wherein when a molar ratio of Si in 1 mol of the chemical composition is set as 4, the chlorosilicate fluorescent material comprises Ca in a molar ratio range of 7.0 or more and 7.94 or less, Eu in a molar ratio range of 0.01 or more and 1.0 or less, Ca and Eu in a total molar ratio range of 7.70 or more and 7.95 or less, Mg in a molar ratio range of 0.9 or more and 1.1 or less, and Cl in a molar ratio range of more than 1.90 and 2.00 or less.

Abstract: 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): X1pEutMgqMnrAlsOp+t+q+r+1.5s??(I) wherein X1 represents at least one element selected from the group consisting of Ba, Sr, and Ca; and p, q, r, s, and t each satisfy 0.5?p?1.0, 0?q<0.6, 0.4<r?0.7, 8.5?s?13.0, 0<t<0.3, 0.5<p+t?1.2, and 0.4<q+r?1.1.

Abstract: 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 cm?1 or more and less than 900 cm?1 is 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 cm?1 and 1,600 cm?1 and an absorbance spectrum of 1,200 cm?1 or more and less than 1,600 cm?1 is 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 cm?1 and 3,680 cm?1 and an absorbance spectrum of 2,700 cm?1 or more and less than 3,680 cm?1 is 5.0 or less.

Abstract: A method of producing a nitride fluorescent material including a step of first heat-treating a first compound containing at least one alkaline earth metal element selected from the group consisting of Ba, Sr, Ca and Mg, a second compound containing at least one element selected from the group consisting of Eu, Ce, Tb and Mn, and a Si-containing compound, in an atmosphere containing nitrogen to obtain a calcined product of raw materials, and a step of second heat-treating the calcined product of raw materials, a Ba-containing compound, a Si-containing compound, and optionally a third compound containing at least one element selected from the group consisting of Eu, Ce, Tb and Mn, and optionally a fourth compound containing at least one alkaline earth metal element selected from the group consisting of Sr, Ca and Mg, in an atmosphere containing nitrogen to obtain a nitride fluorescent material is provided, wherein the ratio of the charge-in molar amount of Ba to the total charge-in molar amount of at least one

Abstract: A wavelength converting member comprising a first wavelength converting layer containing: a first fluorescent material having a light emission peak wavelength in a range of 620 nm or more and 660 nm or less; a second fluorescent material having a light emission peak wavelength in a range of 510 nm or more and 560 nm or less; and a resin, wherein the average particle diameter, as measured according to a Fisher Sub-Sieve Sizer method, of the first fluorescent material is in a range of 2 ?m or more and 30 ?m or less, wherein the second fluorescent material comprises a ?-SiAlON fluorescent material, the circularity of the ?-SiAlON fluorescent material is 0.7 or more, and the volume average particle diameter, as measured according to a laser diffraction scattering particle size distribution measuring method, of the ?-SiAlON fluorescent material is in a range of 2 ?m or more and 30 ?m or less, and wherein the thickness of the first wavelength converting layer is in a range of 50 ?m or more and 200 ?m or less.

Abstract: Provided is a method of producing a nitride fluorescent material containing silicon nitride particles containing Eu, at least one alkaline earth metal selected from the group consisting of Mg, Ca, Sr, and Ba, Al, and fluorine in a composition of the silicon nitride particles. The method includes heat treating a raw material mixture containing an Eu source, a source of the alkaline earth metal, an Al source, an Si source, and an alkaline earth metal fluoride containing at least one selected from the group consisting of Mg, Ca, Sr, and Ba, wherein a molar content ratio of fluorine atom to Al is from 0.02 to 0.3.

Abstract: A method of producing a nitride fluorescent material having relatively high light emission intensity is provided. The method of producing a nitride fluorescent material includes preparing a calcined product having a composition containing at least one first element selected from the group consisting of Ba, Sr, Ca, and Mg, at least one second element selected from the group consisting of Eu, Ce, Tb, and Mn, and Si and N, and bringing the calcined product into contact with a fluorine-containing substance at a temperature in a range of ?20° C. or higher and lower than 150° C.

Abstract: 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 Ma selected from the group consisting of Sr, Ca, Ba and Mg, at least one element Mb selected from the group consisting of Li, Na and K, at least one element Mc selected 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° C. or higher and 500° C.

Abstract: Provided is a method for producing a ?-sialon fluorescent material, comprising preparing a composition containing a silicon nitride that contains aluminium, oxygen, and europium; heat-treating the composition at a temperature in a range of 1300° C. or more and 1600° C. or less to obtain a heat-treated product; subjecting the heat-treated product to a temperature-decrease of from the heat treatment temperature to 1000° C. as a first temperature-decrease step; and subjecting the heat-treated product to a temperature-decrease of from 1000° C. to 400° C. as a second temperature-decrease step. The first temperature-decrease step has a temperature-decrease rate in a range of 1.5° C./min or more and 200° C./min or less, and the second temperature-decrease step has a temperature-decrease rate in a range of 1° C./min or more and 200° C.

Abstract: Provided are a fluorescent material having a high light emission intensity, a method for producing the same, and a light emitting device using the same. The present fluorescent material includes a composition represented by formula (I): SiuEuvAlwOxNy, wherein when the sum of a parameter u and a parameter w is taken as 13, parameters u, v, w, x, and y in the formula (I) satisfy the following formulae (1) to (5). 2.77?u?2.88??(1) 0.04?v?0.08??(2) 10.12?w?10.23??(3) 0.42?x?0.95??(4) 12.89?y?13.

Abstract: 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). X1pEutMgqMnrAlsOp+t+q+r+1.5s??(I) wherein X1 represents at least one element selected from the group consisting of Ba, Sr, and Ca; and p, q, r, s, and t each satisfy 0.5?p?1.0, 0?q<0.6, 0.4<r?0.7, 8.5?s?13.0, 0<t<0.3, 0.5<p+t?1.2, and 0.4<q+r?1.1.

Abstract: A method for producing ?-sialon fluorescent material having excellent emission intensity is provided. The method for producing ?-sialon fluorescent material includes providing a composition comprising silicon nitride that contains aluminium, an oxygen atom, and europium, heat treating the composition, contacting the heat-treated composition with a basic substance, and washing the composition, which has been contacted with the basic substance, with an acidic liquid medium.

Abstract: 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.

Abstract: A wavelength converting member comprising a first wavelength converting layer containing: a first fluorescent material having a light emission peak wavelength in a range of 620 nm or more and 660 nm or less; a second fluorescent material having a light emission peak wavelength in a range of 510 nm or more and 560 nm or less; and a resin, wherein the average particle diameter, as measured according to a Fisher Sub-Sieve Sizer method, of the first fluorescent material is in a range of 2 ?m or more and 30 ?m or less, wherein the second fluorescent material comprises a ?-SiAlON fluorescent material, the circularity of the ?-SiAlON fluorescent material is 0.7 or more, and the volume average particle diameter, as measured according to a laser diffraction scattering particle size distribution measuring method, of the ?-SiAlON fluorescent material is in a range of 2 ?m or more and 30 ?m or less, and wherein the thickness of the first wavelength converting layer is in a range of 50 ?m or more and 200 ?m or less.

Abstract: A method for producing a ?-AlON fluorescent material, comprising: preparing a first mixture containing a compound containing Mn, a compound containing Li, a compound containing Mg, an aluminum oxide, and an aluminum nitride, in which the amount of fluorine is 150 ppm by mass or less relative to the total amount of the first mixture excluding fluorine, and subjecting the first mixture to a first heat treatment to obtain a first calcined product having an average particle diameter D1, as measured according to a Fisher Sub-Sieve Sizer method, of 10.

Abstract: A method of producing a fluorescent material that is capable of providing a light emitting device having excellent durability, a fluorescent material, and a light emitting device are provided. The method of producing the fluorescent material includes: preparing a calcined product having a chlorosilicate composition containing at least one element selected from the group consisting of Ca, Sr, and Ba, at least one element selected from the group consisting of Mg and Zn, at least one element selected from the group consisting of Eu, Ce, Tb, and Mn, Si, O, and Cl; and bringing the calcined product in contact with a fluorine-containing substance and heat-treating the calcined product in an inert gas atmosphere at a temperature in a range of 200° C. or more and 450° C. or less.