Provided herein are phosphors of the formula: (A.sub.1-xEu.sub.x)(Ba.sub.1-ySr.sub.y)B.sub.9O.sub.15, wherein the variables are as defined herein. Methods of producing the phosphors are also provided. In some aspects, the present disclosure provides light-emitting devices comprising these phosphors.

The present disclosure discloses a blue fluorescent powder for a three primary color warm white LED and a preparation method thereof. SrCO.sub.3, NH.sub.4Cl, H.sub.3BO.sub.3, Eu.sub.2O.sub.3, and NH.sub.4H.sub.2PO.sub.4 function as raw materials to obtain a chemical formula of a blue fluorescent powder Sr.sub.(2-x)Eu.sub.x(BO.sub.3).sub.y(PO.sub.4).sub.(1-y)Cl in a reducing atmosphere by a solid-state sintering method, wherein 0.001≤x≤0.1 and 0.001≤y≤0.5. The blue fluorescent powder is mixed with CaAlSiN.sub.3:Eu.sup.2+ red fluorescent powder and (SrBa).sub.2SiO.sub.4:Eu.sup.2+ green fluorescent powder at a certain proportion to emit warm white light with a light efficiency and a color rendering index under a violet light excitation. An application prospect is wide.

A composite material includes at least one photoluminescent material embedded as a light source in a transparent matrix, wherein a refractive index (n.sub.P) of the at least one photoluminescent material and a refractive index (n.sub.M) of the matrix differ by at most ±0.2.

Described herein are methods for improving the color stability of a synthetic polymer composition by incorporating one or more inorganic phosphor dopants into the synthetic polymer. The inorganic phosphor dopants absorb UV light and emit the UV light as down-converted visible light, thereby producing a brighter appearance for the synthetic polymer composition. Methods for preparing the synthetic polymer compositions having improved color stability are additionally described.

The present disclosure discloses a blue fluorescent powder for a three primary color warm white LED and a preparation method thereof. SrCO.sub.3, NH.sub.4Cl, H.sub.3BO.sub.3, Eu.sub.2O.sub.3, and NH.sub.4H.sub.2PO.sub.4 function as raw materials to obtain a chemical formula of a blue fluorescent powder Sr.sub.(2-x)Eu.sub.x(BO.sub.3).sub.y(PO.sub.4).sub.(1-y)Cl in a reducing atmosphere by a solid-state sintering method, wherein 0.001x0.1 and 0.001y0.5. The blue fluorescent powder is mixed with CaAlSiN.sub.3:Eu.sup.2+ red fluorescent powder and (SrBa).sub.2SiO.sub.4:Eu.sup.2+ green fluorescent powder at a certain proportion to emit warm white light with a light efficiency and a color rendering index under a violet light excitation. An application prospect is wide.

The present invention relates to a composition comprising at least one phosphor.

A composite material includes at least one photoluminescent material embedded as a light source in a transparent matrix, wherein a refractive index (n.sub.P) of the at least one photoluminescent material and a refractive index (n.sub.M) of the matrix differ by at most 0.2.

A lighting apparatus for emitting white light including a semiconductor light source emitting radiation with a peak emission between from about 250 nm to about 500 nm and a first phosphor having a peak emission between about 550 and 615 nm, wherein an overall emission spectrum of the lighting apparatus has a depression between about 550 and 615 nm, whereby the red-green color contrast is increased versus a reference illuminant.

Provided herein are phosphors of the formula: (A.sub.1-xEu.sub.x)(Ba.sub.1-ySr.sub.y)B.sub.9O.sub.15, wherein the variables are as defined herein. Methods of producing the phosphors are also provided. In some aspects, the present disclosure provides light-emitting devices comprising these phosphors.