A phosphor and a method for making the phosphor are disclosed. In an embodiment a phosphor for emission of red light includes Sr(Sr.sub.aCa.sub.1-a)Si.sub.2Al.sub.2N.sub.6:Eu, wherein x is 0.8<x≤1, wherein between 0.1% and 5% inclusive of the Sr, Ca and/or Sr/Ca lattice sites are replaced by Eu, wherein the parameter value a is between 0.6 and 1.0 inclusive, wherein the phosphor has a structure comprising (Si/Al)N.sub.4 tetrahedra arranged in a 3D network, in which layers in an a-c plane are linked in a b-direction, and wherein pure Sr positions and positions having a mixed Sr/Ca population are intercalated between the network, layer by layer.

Provided is a wavelength conversion member that is less decreased in luminescence intensity with time by irradiation with light of an LED or LD and a light emitting device using the wavelength conversion member. A wavelength conversion member is formed of an inorganic phosphor dispersed in a glass matrix, wherein the glass matrix contains, in % by mole, 30 to 85% SiO.sub.2, 4.3 to 20% B.sub.2O.sub.3, 0 to 25% Al.sub.2O.sub.3, 0 to 3% Li.sub.2O, 0 to 3% Na.sub.2O, 0 to 3% K.sub.2O, 0 to 3% Li.sub.2O+Na.sub.2O+K.sub.2O, 0 to 35% MgO, 0 to 35% CaO, 0 to 35% SrO, 0 to 35% BaO, 0.1 to 45% MgO+CaO+SrO+BaO, and 0 to 5% ZnO, and the inorganic phosphor is at least one selected from the group consisting of an oxide phosphor, a nitride phosphor, an oxynitride phosphor, a chloride phosphor, an oxychloride phosphor, a halide phosphor, an aluminate phosphor, and a halophosphoric acid chloride phosphor.

The invention relates to an optoelectronic component (100) having a semiconductor chip (2) for generating a primary radiation in the blue spectral range, a conversion element (4) which is arranged in the beam path of the semiconductor chip and is designed to generate a secondary radiation from the primary radiation, wherein the conversion element (4) comprises at least one first phosphor (9) and a second phosphor (10), wherein the first phosphor (9) is Sr(Sr.sub.1−xCa.sub.x)Si.sub.2Al.sub.2N.sub.6:Eu.sup.2+ and/or (Sr.sub.1−yCa.sub.y)[LiAl.sub.3N.sub.4]:Eu.sup.2+, where 0≤x≤1 and 0≤y≤1, wherein a total radiation (G) exiting from the component (100) is white mixed light.

Phosphors include a CaAlSiN.sub.3 family crystal phase, wherein the CaAlSiN.sub.3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.

To provide a light emitting device that is used for a display that is able to display an image having a wider color gamut. This light emitting device includes: a first light source configured to perform an operation of blinking first emission light including first blue light and first red light; and a second light source configured to perform an operation of blinking second emission light independently of the operation of blinking the first emission light by the first light source. The second emission light includes second red light and green light.

The invention relates to a material represented by the following formula (I)
(M′).sub.8(M″M′″).sub.6O.sub.24(X,X′).sub.2:M″″   formula (I).
Further, the invention relates to a luminescent material, and to different medical imaging and diagnostic methods of using the material. Also disclosed is a method of securely identifying an item using the material.

Provided are: a wavelength conversion member capable of reducing the decrease in luminescence intensity with time and the melting of component materials when irradiated with high-power excitation light; a method for manufacturing the same; and a light-emitting device using the wavelength conversion member. A wavelength conversion member 10 is made of a phosphor powder 2 and a thermally conductive filler 3 both dispersed into an inorganic binder 1, a refractive index difference between the inorganic binder 1 and the thermally conductive filler 3 being 0.2 or less, a volume ratio of a content of the inorganic binder 1 to a content of the thermally conductive filler 3 being 40:60 to 5:95.

Provided are: a wavelength conversion member capable of reducing the decrease in luminescence intensity with time and the melting of component materials when irradiated with high-power excitation light; a method for manufacturing the same; and a light-emitting device using the wavelength conversion member. A wavelength conversion member 10 is made of a phosphor powder 2 and a thermally conductive filler 3 both dispersed into an inorganic binder 1, a refractive index difference between the inorganic binder 1 and the thermally conductive filler 3 being 0.2 or less, a volume ratio of a content of the inorganic binder 1 to a content of the thermally conductive filler 3 being 40:60 to 5:95.

A light-emitting device includes a light-emitting element having a top surface, a bottom surface opposite to the top surface, and side surfaces connecting the top surface and the bottom surface. An element electrode of the light-emitting element is located on the bottom surface. A phosphor layer is disposed above the top surface of the light-emitting element and having side surfaces. A reflective member covers side surfaces of the light-emitting element and side surfaces of the phosphor layer. A dielectric multilayer film is disposed on at least one of the side surfaces of the light-emitting element and disposed on at least one of the side surfaces of the phosphor layer and not located between the light emitting element and the phosphor layer. The dielectric multilayer film is not provided on an upper surface of the phosphor layer.

A spontaneous emission type photo conversion substance for light therapy which outputs a specific wavelength, a functional patch, and functional mask pack comprising the same are provided. The photo conversion substance is designed to use a sapphire-based blue axial light fluorescent substance to light exciting in the core, have a relatively long light emission time, and absorb light exciting by selecting a wavelength at the shell part for light emission. The photo conversion substance has a structure capable of selecting a wavelength in order to efficiently express the light therapy function, which is included in the functional patch and functional mask pack.