A process for synthesizing a manganese doped phosphor of formula I: A.sub.x [MF.sub.y]:Mn.sup.4+ is presented. The process includes contacting a first solution with a second solution and a third solution in the presence of a plurality of inert particles. The first solution and the second solution include a composition of formula II: A.sub.x[MnF.sub.y]. The third solution includes a source of M, where A is Li, Na, K, Rb, Cs, or combinations thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or combinations thereof; x is an absolute value of a charge of the [MF.sub.y] ion; and y is 5, 6 or 7.

The present invention relates to a metal fluoride red phosphor and an application of the phosphor as a light emitting element, the metal fluoride red phosphor having a tetragonal crystal structure of a novel composition, and emitting light in the red color wavelength by being excited by ultraviolet rays or a blue excitation source, thereby being usefully applicable to a light emitting element such as a light emitting diode, a laser diode, a surface emitting laser diode, an inorganic electroluminescence element, and an organic electroluminescence element.

Disclosed herein is a scintillator for use in an x-ray backscattering system. The scintillator comprises an inorganic scintillator portion made of inorganic scintillating material and comprising one or more inorganic material elements. Each inorganic material element of the one or more inorganic material elements comprises an outer surface, and an inner surface opposite the outer surface. The outer surface is configured to be proximate to a subject to be scanned, such that the outer surface is configured to receive x-ray photons scattered by the subject. The scintillator also comprises an organic scintillator portion made of an organic scintillating material and comprising a front surface. At least a portion of the front surface abuts the inner surface of at least one of the one or more inorganic material elements.

A lighting apparatus includes a semiconductor light source in direct contact with a polymer composite comprising a color stable Mn.sup.4+ doped phosphor, wherein the lighting apparatus has a color shift of 1.5 MacAdam ellipses after operating for at least 2,000 hour at a LED current density greater than 2 A/cm.sup.2, a LED wall-plug efficiency greater than 40%, and a board temperature greater than 25 C.

An optoelectronic component is disclosed. In an embodiment, an optoelectronic component includes a semiconductor chip configured to emit primary radiation having a peak wavelength between 420 nm inclusive and 480 nm inclusive and a conversion element including a first converter material configured to partially convert the primary radiation into secondary radiation in a green range of the electromagnetic spectrum and a second converter material configured to partially convert the primary radiation into a secondary radiation in a red region of the electromagnetic spectrum, wherein the second converter material including a first red phosphor of the formula (K,Na).sub.2(Si,Ti)F.sub.6:Mn.sup.4+ and a second red phosphor of the formula(M).sub.2-xEu.sub.xSi.sub.2Al.sub.2N.sub.6 where M=Sr, Ca, Ba, and/or Mg and 0.001x0.2, and wherein the optoelectronic device is configured to emit white total radiation.

A process for preparing a population of coated phosphor particles is presented. The process includes combining particles of a phosphor of formula I: A.sub.x [MF.sub.y]:Mn.sup.4+ with a first solution including a compound of formula II: A.sub.x[MF.sub.y] to form a suspension, where A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is an absolute value of a charge of the [MF.sub.y] ion; and y is 5, 6 or 7. The process further includes combining a second solution including a source A.sup.+ ions with the suspension.

Disclosed herein is a scintillator for use in an x-ray backscattering system. The scintillator comprises an inorganic scintillator portion made of inorganic scintillating material and comprising one or more inorganic material elements. Each inorganic material element of the one or more inorganic material elements comprises an outer surface, and an inner surface opposite the outer surface. The outer surface is configured to be proximate to a subject to be scanned, such that the outer surface is configured to receive x-ray photons scattered by the subject. The scintillator also comprises an organic scintillator portion made of an organic scintillating material and comprising a front surface. At least a portion of the front surface abuts the inner surface of at least one of the one or more inorganic material elements.

The invention relates to a red phosphor with a narrow full width at half maximum, having improved decay time and resolving afterglow phenomenon. The fluoride-based phosphor according to the invention is characterized in including a host having a composition of the following [Formula 1] including rubidium (Rb), cesium (Cs), silicon (Si) and fluorine (F) as constituent elements, and manganese (Mn) which is solid solution treated in the host as an activator:
Rb.sub.3-xCs.sub.xSiF.sub.7[Formula 1] (where, 0<x<3).

Provided are a luminescent compound represented by Formula 1, a method of preparing the same, and a light-emitting device including the same:

[A.sup.1.sub.nA.sup.2.sub.(3n)][B.sup.1.sub.mB.sup.2.sub.(2m)]X.sub.5 Formula 1

wherein, in Formula 1, A.sup.1, A.sup.2, B.sup.1, B.sup.2, n, m, and X are as defined in the specification.

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 1000 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%.