A light emitting device includes a first light source containing a first light emitting element, and a second light source containing a second light emitting element and a second fluorescent material, the first light source emits light in a region that is demarcated in a chromaticity diagram of the CIE 1931 color coordinate system by a first straight line connecting a first point having x,y of 0.280, 0.070 in the chromaticity coordinate and a second point having x,y of 0.280, 0.500 in the chromaticity coordinate, a second straight line connecting the second point and a third point having x,y of 0.013, 0.500 in the chromaticity coordinate, a purple boundary extending from the first point toward a direction in which x decreases in the chromaticity coordinate, and a spectrum locus extending from the third point toward a direction in which y decreases in the chromaticity coordinate, in a light emission spectrum, a light emission intensity ratio I.sub.PM/I.sub.PL of a light emission intensity I.sub.PM at a wavelength of 490 nm with respect to a light emission intensity I.sub.PL at a maximum light emission peak wavelength of the first light emitting element is in a range of 0.22 or more and 0.95 or less, the second light source emits light having a color deviation duv from a blackbody radiation locus in a range of −0.02 or more and 0.02 or less measured according to JIS Z8725 with a correlated color temperature in a range of 1,500 K or more and 8,000 K or less in a chromaticity diagram of the CIE 1931 color coordinate system, and the light emitting device emits mixed color light of light emitted from the first light source and light emitted from the second light source.

The present invention relates to europium-, cerium-, samarium- or praseodymium-doped boronitrides, to a process for the preparation of these compounds, and to the use of the doped boronitrides according to the invention as conversion phosphors. The present invention furthermore relates to a light source which contains a doped boronitride according to the invention.

An embodiment provides a phosphor composition and a light emitting device package comprising the same, wherein the phosphor composition comprises green phosphor, amber phosphor, and red phosphor, wherein the amber phosphor is expressed as chemical formula Li.sub.m−2XSi.sub.12-m−nAl.sub.m+nO.sub.nN.sub.16-n:Eu.sup.2+, where 2≦m≦5, 2≦n≦10, 0.01≦X≦1. The light emitting element package of the embodiment can display white light having improved brightness and color rendering index.

Scintillator materials, as well as related systems, and methods of detection using the same, are described herein. The scintillator material composition may comprise a Tl-based scintillator material. For example, the composition may comprise a thallium-based halide. Such materials have been shown to have particularly attractive scintillation properties and may be used in a variety of applications for detection radiation.

Mixed halide scintillation materials of a first general formula A.sub.4B.sub.(1-y)M.sub.yX′.sub.6(1-z)X″.sub.6z and a second general formula A.sub.(4-y)BM.sub.yX′.sub.6(1-z)X″.sub.6z are disclosed. In the general formulas, A is an alkali metal, B is an alkali earth metal, and X′ and X″ are two different halogen atoms. Scintillation materials of the first general formula include a divalent external activator M such as Eu.sup.2+ or Yb.sup.2+ or a trivalent external activator M such as Ce.sup.3+. Scintillation materials of the second general formula include a monovalent external activator M such as In.sup.+, Na.sup.+, or Tl.sup.+ or a trivalent external activator such as Ce.sup.3+.

Strontium halide scintillators, calcium halide scintillators, cerium halide scintillators, cesium barium halide scintillators, and related devices and methods are provided.

The present invention provides for a composition comprising an inorganic scintillator comprising an optionally lanthanide-doped cesium barium halide, useful for detecting nuclear material.

A light emitting device includes a first light source containing a first light emitting element, and a second light source containing a second light emitting element and a second fluorescent material, the first light source emits light in a region that is demarcated in a chromaticity diagram of the CIE 1931 color coordinate system by a first straight line connecting a first point having x,y of 0.280,0.070 in the chromaticity coordinate and a second point having x,y of 0.280,0.500 in the chromaticity coordinate, a second straight line connecting the second point and a third point having x,y of 0.013,0.500 in the chromaticity coordinate, a purple boundary extending from the first point toward a direction in which x decreases in the chromaticity coordinate, and a spectrum locus extending from the third point toward a direction in which y decreases in the chromaticity coordinate, in a light emission spectrum, a light emission intensity ratio I.sub.PM/I.sub.PL of a light emission intensity I.sub.PM at a wavelength of 490 nm with respect to a light emission intensity I.sub.PL at a maximum light emission peak wavelength of the first light emitting element is in a range of 0.22 or more and 0.95 or less, the second light source emits light having a color deviation duv from a blackbody radiation locus in a range of −0.02 or more and 0.02 or less measured according to JIS Z8725 with a correlated color temperature in a range of 1,500 K or more and 8,000 K or less in a chromaticity diagram of the CIE 1931 color coordinate system, and the light emitting device emits mixed color light of light emitted from the first light source and light emitted from the second light source.

Ternary transition metal halides are described herein. The ternary transition metal halides may be used as scintillator materials.

Disclosed herein is a material, comprising a first metal halide that is operative to function as a scintillator; where the first metal halide excludes cesium iodide, strontium iodide, and cesium bromide; and a surface layer comprising a second metal halide that is disposed on a surface of the first metal halide; where the second metal halide has a lower water solubility than the first metal halide.