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.

A color conversion film is provided. The film includes at least one narrow band emission phosphor dispersed within a binder matrix, wherein the narrow band emission phosphor has a D50 particle size from about 0.1 .Math.m to about 15 .Math.m and is selected from the group consisting of a green-emitting U.sup.6+-containing phosphor, a green-emitting Mn.sup.2+-containing phosphor, a red-emitting phosphor based on complex fluoride materials activated by Mn.sup.4+, and a mixture thereof. A device is also provided.

Briefly, in one aspect, the present invention relates to processes for producing a stabilized Mn.sup.4+ doped phosphor in solid form and a composition containing such doped phosphor. Such process may include combining a) a solution comprising at least one substance selected from the group consisting of: K.sub.2HPO.sub.4, an aluminum phosphate, oxalic acid, phosphoric acid, a surfactant, a chelating agent, or a combination thereof, with b) a Mn.sup.4+ doped phosphor of formula I in solid form, where formula I may be: A.sub.x [MF.sub.y]:Mn.sup.4+. The process can further include isolating the stabilized Mn.sup.4+ doped phosphor in solid form. In formula I, A may be Li, Na, K, Rb, Cs, or a combination thereof. In formula I, M may be Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof. In formula I, x is the absolute value of the charge of the [MF.sub.y] ion and y is 5, 6 or 7.

A compound of the general formula A.sub.2N.sub.1-xM.sub.xO.sub.2xX.sub.6-2x doped with Mn(IV), in which A is selected from the group consisting of Li, Na, K, Rb, Cs, Cu, Ag, Ti, NH.sub.4 or a combination thereof, N is selected from the group consisting of Si, Ge, Sn, Ti, Pb, Ce, Zr, Ru, Ir, Pr and/or Hf or a combination thereof, M is selected from the group consisting of W, Cr, Mo, Te and/or Re or a combination thereof, X is selected from the group consisting of F, Cl, Br, I or a combination thereof, and 0<x≤1.

A light emitting device comprises 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 first fluorescent material having a light emission peak wavelength in a range of 570 nm or more and 680 nm or less, and emits light having a correlated color temperature being 1,950 K or less, an average color rendering index Ra being 51 or more, a full width at half maximum of a light emission peak having a maximum light emission intensity in a light emission spectrum of the light emitting device being 110 nm or less, and a first glare index Ls1/L that is a ratio of a first effective radiance Ls1 to a luminance L being 0.493 or less, wherein Ls1 and L are as defined in the disclosure.

A lighting device comprising: a first LED having a wavelength of maximum emission intensity from 620 nm to 640 nm; a second LED having a wavelength of maximum emission intensity from 500 nm to 565 nm; a third LED having a wavelength of maximum emission intensity from 430 nm to 480 nm; and a fourth LED for generating light comprising a CCT in a range from 1800K to 5000K. The first LED comprises a Phosphor-Converted LED comprising a first LED chip having a maximum emission intensity wavelength from 400 nm to 480 nm, and a narrowband red phosphor with a FWHM less than 55 nm. Light generated by the device comprises a combination of light generated by the first, second, third, and fourth LEDs and a CCT of light generated by the device is tunable by independently controlling power to the first, second, third, and fourth LEDs.

A europium-doped β-sialon phosphor, in which, when the ratio of an aluminum element at a depth of 8 nm from the surface of the phosphor, which is obtained by X-ray photoelectron spectroscopy, is indicated by P.sub.8 [at %], and the ratio of an aluminum element at a depth of 80 nm from the surface of the phosphor is indicated by P.sub.80 [at %], P.sub.8/P.sub.80≤0.9 is satisfied. A light emitting device containing this β-sialon phosphor.

The invention provides alighting device (1) comprising a solid state light source (10) configured to generate light source light (11) and a converter element (100) configured to convert at least part of the light source light (11) into converter element light (101), wherein the converter element (100) comprises a polymeric host matrix element (120) hosting a particulate first luminescent material (110) of the type M.sub.2AX.sub.6 doped with tetravalent manganese, wherein M comprises an alkaline cation, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine (F), wherein the particulate first luminescent material (110) is available in the polymeric host matrix element (120) with an average weight percentage x averaged over the polymeric host matrix element (120), wherein the polymeric host matrix element (120) has a first outer face (121), wherein an outer layer volume defined by at least part of the first outer face (121) and a first distance (d1) from said first outer face (121) hosts the particulate first luminescent material (110) with a first local weight percentage y averaged over the outer layer volume with a ratio of the first local weight percentage y over the averaged weight percentage x of y/x≤0.1, and wherein the first distance (d1) is at least 10 μm.

A color temperature tunable LED-filament includes an elongated light-transmissive substrate; a first array of LED chips on a front face of the substrate; a second array of LED chips on the front face of the substrate; a first photoluminescence layer covering the first array of LED chips; a second photoluminescence layer covering the second array of LED chips; and a circuit arrangement enabling independent power control to the first and second LED arrays or relative power control to the first and second array of LED chips to control the color temperature of light generated by the LED-filament.

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.sub.4.sub.+, 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.