Provided is a method for producing an inorganic fluoride luminescent material using a non-aqueous solution.

The method for producing an inorganic fluoride luminescent material includes: either preparing a first non-aqueous solution that contains a first ion, a second ion, and a first non-aqueous hydrogen fluoride-containing liquid, and a second non-aqueous solution that contains a third ion and a second non-aqueous hydrogen fluoride-containing liquid, or preparing a third non-aqueous solution that contains a first ion, a second ion, a third ion, and a third non-aqueous hydrogen fluoride-containing liquid; and either mixing the first non-aqueous solution and the second non-aqueous solution with a non-aqueous organic liquid, or mixing the third non-aqueous solution with a non-aqueous organic liquid, to obtain an inorganic fluoride luminescent material containing a first element M1 and/or ammonium, a second element M2, and a third element M3.

Provided is a method for producing an inorganic fluoride luminescent material using a non-aqueous solution.

The method for producing an inorganic fluoride luminescent material includes: either preparing a first non-aqueous solution that contains a first ion, a second ion, and a first non-aqueous hydrogen fluoride-containing liquid, and a second non-aqueous solution that contains a third ion and a second non-aqueous hydrogen fluoride-containing liquid, or preparing a third non-aqueous solution that contains a first ion, a second ion, a third ion, and a third non-aqueous hydrogen fluoride-containing liquid; and either mixing the first non-aqueous solution and the second non-aqueous solution with a non-aqueous organic liquid, or mixing the third non-aqueous solution with a non-aqueous organic liquid, to obtain an inorganic fluoride luminescent material containing a first element M1 and/or ammonium, a second element M2, and a third element M3.

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.

A light emission device including a light emitting element having a light emission peak wavelength in a range of 400 nm or more and 490 nm or less; and a fluorescent member including a first fluorescent material having a light emission peak wavelength in a range of 510 nm or more and less than 580 nm, a second fluorescent material having a light emission peak wavelength in a range of 580 nm or more and 680 nm or less and a full width at half maximum of 15 nm or more and 100 nm or less, and a third fluorescent material having a light emission peak wavelength in a range of 600 nm or more and 650 nm or less and a full width at half maximum of 14 nm or less, and having a melanopic ratio (MR) value in a specified range at a certain correlated color temperature.

To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100° C. to the emission intensity at 25° C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.

A method of producing a light transmissive element includes providing a holding member including an upper surface and a plurality of holes, each of the plurality of holes having at least one inner lateral surface that is a substantially smooth surface and an opening in the upper surface of the holding member; filling the plurality of holes with a wavelength conversion member containing fluorescent particles and a light transmissive member such that the wavelength conversion member is in contact with the inner lateral surface of each of the plurality of holes; molding the wavelength conversion member; and taking out the wavelength conversion member from the holding member after the molding of the wavelength conversion member.

The present invention relates to a red phosphor, a preparation method thereof and a light-emitting device prepared therefrom. A particle of the red phosphor consists of a phosphor inner core having a chemical formula of A.sub.x1Ge.sub.z1F.sub.6:y.sub.1Mn.sup.4+ and an outer shell having a chemical formula of B.sub.x2M.sub.z2F.sub.6:y.sub.2Mn.sup.4+, wherein 1.596≤x.sub.1≤2.2, 1.6≤x.sub.2≤2.2, 0.001≤y.sub.1≤0.2, 0≤y.sub.2≤0.2, 0.9≤z.sub.1≤1.1, and 0.9≤z.sub.2≤1.1; A and B are independently selected from alkali metal elements; and M is Si, or Si and Ge. The red phosphor provided by the present invention has high luminous efficiency and stability. Moreover, the phosphor alone or in combination with other luminescent materials can be used for preparing a light-emitting device with high performance.

A nanocrystal particle including at least one semiconductor material and at least one halogen element, the nanocrystal particle including: a core comprising a first semiconductor nanocrystal; and a shell surrounding the core and comprising a crystalline or amorphous material, wherein the halogen element is present as being doped therein or as a metal halide.

A nanocrystal particle including at least one semiconductor material and at least one halogen element, the nanocrystal particle including: a core comprising a first semiconductor nanocrystal; and a shell surrounding the core and comprising a crystalline or amorphous material, wherein the halogen element is present as being doped therein or as a metal halide.

Provided is a wavelength conversion member in which the following are dispersed in a thermoplastic resin: a LuYAG fluorescent material that is represented by (Y.sub.1-α-βLu.sub.αCe.sub.β).sub.3Al.sub.5O.sub.12 (in which α is a positive number between 0.3-0.8 inclusive and β is a positive number between 0.01-0.05 inclusive), that emits yellow-green light as a result of excitation by blue light, and that has a diffraction peak within a range in which the diffraction angle 2θ in X-ray diffraction by the K.sub.α1 line of Cu is 52.9° to 53.2° inclusive; and a KSF fluorescent material that is represented by K.sub.2(Si.sub.1-xMn.sub.x)F.sub.6 (in which x is a positive number between 0.001 and 0.3 inclusive) and that emits red light as a result of excitation by blue light. The content of the KSF fluorescent material in the wavelength conversion member is 1 to 5 times the content of the LuYAG fluorescent material by mass ratio. The wavelength conversion member makes it possible to provide a light-emitting device that has small color deviation, that is suitable as a lighting device, that emits white light, and that has good color rendering properties in a color temperature range of 4,000-6,500K, i.e., the color temperature range from white to daylight color.