Abstract: Provided are a method for treating the surface of a (Sr,Ca)AlSiN3 nitride phosphor that can improve the moisture-resistance reliability thereof without deterioration in optical properties, a phosphor, a light-emitting device, and an illumination device. The surface of a phosphor is treated in an immersion step of immersing a phosphor of which the host crystal has a crystal structure substantially identical with that of (Sr,Ca)AlSiN3 crystal in an aqueous ammonium phosphate-containing solution (Step 1) and a heat-treating step of leaving the phosphor after the immersion step in an environment at a temperature of 250 to 550° C. for 2 to 24 hours (Step 2).

Abstract: A phosphor material manufacturing method includes: prefabricating a LaPO4:Tm+ solution or a LaPO4:Eu+ solution in nitric acid; adding a carbon nano-sized material to the LaPO4:Tm+ solution or the LaPO4:Eu3+ solution for mixing to obtain a mixed solution precursors; precipitating the mixed solution and separating a precipitation substance from the mixed solution; drying and grinding the precipitation substance to obtain a powder material; the powder material with a predetermined temperature to form a sintered LaPO4:Tm+ phosphor material or a sintered LaPO4:Eu+ phosphor material. Advantageously, the sintered LaPO4:Tm+ phosphor material or the sintered LaPO4:Eu+ phosphor material is coated by the carbon nano-sized material for enhancing the efficiency of energy transfer and luminance of the phosphor material.

Abstract: A rare earth ions doped luminescent silicate glass is provided having the general formula of: 45SiO2-aLi2O-bMO-5Al2O3-3K2O-2P2O5:cEu2O3, wherein a is molar ratio of Li2O, b is molar ratio of MO and c is molar ratio of Eu2O3, wherein a+b=45, 25?a?35 and 0.025?c?0.50, and wherein MO is one or more of alkaline earth metal oxides. The luminescent glass can be prepared by simple progress, without pollution and at low cost. The resulting glass can be excited by UV LED chip and blue LED chip. Bright green light can be obtained by the sample under excitation of UV LED chip, while bright white light can be obtained under excitation of blue LED chip. The luminescent glass can be coupled with LED to obtain novel LED devices and provides potential applications in the field of semiconductor lighting.

Abstract: A white-light LED red phosphor and method of manufacturing the same are provided. The luminescent materials are represented by the general formula: Ca1-y-m-e-rYyMmXx-pPpZzNn:Eue, Rf, wherein M is at least one selected from Sr, Ba, Sc, Li, Na and K; X is at least one selected from B, Al and Ga, and Al must be contained; Z is at least one selected from Si, V and Nb, and Si must be contained; R is at least one selected from Dy, Er, Tm and Lu, and Dy must be contained; 0.001?y?0.2, 0.001?m?0.2, 0.5?x?1.5, 0.5?z?1.5, 0.001?p?0.1, 2?n?4, 0.001?e?0.2 and 0.001?r?0.1. The phosphor according to the present invention has features such as good chemical stability, high luminous efficiency, and good anti-luminous attenuation performance, etc.

Abstract: Terbium doped phosphate-based green luminescent material and preparation method thereof are provided. The chemical formula of the material is M3RE1-xTbx(PO4)3, wherein, M is alkaline-earth metals, RE is rare-earth elements, x is in a range of 0.001 to 1. The preparation method of the material includes the following steps; providing the compound used as the source of alkaline earth metal, the compound used as the source of phosphate, the compound used as the source of rare-earth, and the compound used as the source of Tb3+ according to the molar ratio of the elements in M3RE1-xTbx(PO4)3, wherein, the compound used as the source of phosphate is added at excess molar ratio in a range of 10% to 30%; mixing and grinding the compound to get mixture; sintering the mixture as pre-treatment, and then cooling the mixture to get a sintered matter; grinding; calcining in reducing atmosphere, and then cooling them.

Abstract: The invention belongs to the field of luminescent materials. Disclosed are luminescent materials doped with metal nano particles and preparation methods therefor. The luminescent materials doped with metal nano particles are represented by the chemical formula: A5-x(PO4)2SiO4:xRE@My, wherein @ is for coating, M is inner core, M is one metal nano particle selected from Ag, Au, Pt, Pd and Cu; RE is one or two ions selected from Eu, Gd, Tb, Tm, Sm, Ce, Dy and Mn; A is one or two elements selected from Ca, Sr, Ba, Mg, Li, Na and K; x is stoichiometric coefficient, 0<x?1; y is molar ratio of M and Si, 0<y?0.01. When luminescent materials doped with metal nano particles of the invention are excitated by electron beam, they have higher luminescent efficiency. The luminescent materials are good to be used in field emission light source devices.

Abstract: Provided is a rare earth phosphovanadate phosphor that is excellent in emission characteristics and preferred also from the viewpoint of industrial production, and a production method thereof. The rare earth phosphovanadate phosphor includes at least a primary particle in which a linear uneven pattern including a plurality of ridge lines parallel to each other is formed on the surface of the particle. Further, the method for producing a rare earth phosphovanadate phosphor involves generating a mixture of a rare earth phosphovanadate phosphor and an alkali metal vanadate, and removing the alkali metal vanadate.

Abstract: There is disclosed a composition for converting electromagnetic energy to ultraviolet C (UVC) radiation or radiation of a shorter wavelength, the composition comprising at least one phosphor capable of converting an initial electromagnetic energy (A) to an electromagnetic energy (B) comprising UVC radiation or radiation of a shorter wavelength, and an organic or inorganic media containing said phosphor. There is also a method of sterilizing an article by exposing it to UVC radiation or radiation of a shorter wavelength for a time sufficient to deactivate or kill at least one microorganism and/or for a time sufficient to inhibit abnormal cell growth within the body, when said composition is in an implantable medical device. A method of coating an article with such compositions is also disclosed.

Abstract: A nanoparticle has a semiconductor nanocrystal capable of emitting light. The nanoparticle further includes a ligand attached to a surface of the coating. The ligand is represented by the formula: X-Sp-Z, wherein X represents, e.g., a primary amine group, a secondary amine group, a urea, a thiourea, an imidizole group, an amide group, a phosphonic or arsonic acid group, a phosphinic or arsinic acid group, a phosphate or arsenate group, a phosphine or arsine oxide group; Sp represents a spacer group, such as a group capable of allowing a transfer of charge or an insulating group; and Z represents: (i) reactive group capable of communicating specific chemical properties to the nanocrystal as well as provide specific chemical reactivity to the surface of the nanocrystal, and/or (ii) a group that is cyclic, halogenated, or polar a-protic.

Abstract: The invention provides a a luminescent material comprising particles of UV-luminescent material having a coating, wherein the coating (a “multi-layer coating”) comprises a first coating layer and a second coating layer, wherein the first coating layer is between the luminescent material and the second coating layer, and wherein in a specific embodiment the second coating layer comprises an alkaline earth oxide, especially MgO. Further, the invention provides a lighting unit comprising such luminescent material.

Abstract: The present invention provides a method of producing a crystalline metal sulfide nanostructure. The metal is a transitional metal or a Group IV metal. In the method, a porous membrane is placed between a metal precursor solution and a sulfur precursor solution. The metal cations of the metal precursor solution and sulfur ions of the sulfur precursor solution react, thereby producing a crystalline metal sulfide nanostructure.

Abstract: A phosphor material having reduced Tb content is disclosed, together with methods for preparing and using the same.

Abstract: A novel type of green luminophore containing mixed rare-earth phosphates is produced from precursor particles having a mean diameter ranging from 1.5 to 15 microns; such particles have an inorganic core and a shell of a mixed lanthanum and/or cerium phosphate, optionally doped with terbium, evenly covering the inorganic core with a thickness greater than or equal to 300 nm.

Abstract: Cerium, gadolinium and terbium doped aluminum phosphates of formula I may be used in fluorescent lamps Al1-x-y-z-a-b-c-d-eTbxCeyGdzLuaScbIncLadGaePO4??I wherein x is greater than or equal to about 0.001 and less than or equal to about 0.3; y is greater than or equal to about 0.001 and less than or equal to about 0.3; z is greater than or equal to about 0.01 and less than or equal to about 0.3; a is greater than or equal to about 0.01 and less than or equal to about 0.1; b is greater than or equal to about 0.01 and less than or equal to about 0.1; c is greater than or equal to about 0.01 and less than or equal to about 0.1. d is greater than or equal to about 0.01 and less than or equal to about 0.1; and e is greater than or equal to about 0.01 and less than or equal to about 0.1.

Abstract: A novel type of green luminophore containing mixed rare-earth phosphates is produced from precursor particles having a mean diameter ranging from 1.5 to 15 microns; such particles have an inorganic core and a shell of a mixed lanthanum and/or cerium phosphate, optionally doped with terbium, evenly covering the inorganic core with a thickness greater than or equal to 300 nm.

Abstract: Disclosed is a phosphor having a formula of M(M?1-y-zEuyMnz)(M?1-xPrx)(PO4)2. M is a monovalent metal element selected from Li, Na, K, or combinations thereof. M?, Eu, and Mn are divalent metal elements, and M? is selected from Ca, Sr, Ba, Mg, Zn, or combinations thereof. M? and Pr are trivalent metal elements, and M? is selected from Sc, Y, La, Lu, Al, Ga, In, or combinations thereof. 0?x?0.2, 0?y?0.1, 0?z?0.2, and x+y+z?0.

Abstract: Embodiments are directed to glass frits containing phosphors that can be used in LED lighting devices and for methods associated therewith for making the phosphor containing glass frit and their use in glass articles, for example, LED devices.

Abstract: A white-light LED red phosphor and method of manufacturing the same are provided. The luminescent materials are represented by the general formula: Ca1-y-m-e-rYyMmXx-pPpZzNn:Eue, Rf, wherein M is at least one selected from Sr, Ba, Sc, Li, Na and K; X is at least one selected from B, Al and Ga, and Al must be contained; Z is at least one selected from Si, V and Nb, and Si must be contained; R is at least one selected from Dy, Er, Tm and Lu, and Dy must be contained; 0.001?y?0.2, 0.001?m?0.2, 0.5?x,z?1.5, 0.001?p?0.1, 2?n?4, 0.001?e?0.2 and 0.001?r?0.1. The phosphor according to the present invention has features such as good chemical stability, high luminous efficiency, and good anti-luminous attenuation performance, etc.

Abstract: A method of producing a phosphor is described in which a precursor including particles having an average diameter from 1.5 micrometers to 15 micrometers is heat-treated under a reducing atmosphere. The method can produce particles including a mineral core and a shell including a composite phosphate of lanthanum and/or cerium, optionally doped with terbium. The composite phosphate of lanthanum and/or cerium covers the mineral core uniformly over a thickness greater than or equal to 300 nm. The aforementioned heat treatment at a temperature of 1050° C. to 1150° C. and for a time period of 2 hours to 4 hours can involve the use of lithium tetraborate (Li2B4O7), which serves as a fluxing agent, in a mass quantity of at most 0.2%.

Abstract: A phosphate particle with a mean diameter of from 1.5 ?m to 15 ?m, which has an inorganic core and a shell that covers the inorganic core uniformly over a thickness of no less than 300 nm, is described. The shell can have a lanthanum cerium terbium phosphate of formula La(1-x-y)CexTbyPO4, where 0.2?x?0.35 and 0.19?y?0.22. The phosphor is produced by heat-treating a phosphate at a temperature of greater than 900° C.

Abstract: Disclosed is a phosphor composite material which can be fired at low temperatures and enables to obtain a phosphor composite member which is excellent in weather resistance and reduced in deterioration after long use. Also disclosed is a phosphor composite member obtained by firing such a phosphor composite material. Specifically disclosed is a phosphor composite material composed of a glass powder and a phosphor powder, which is characterized in that the glass powder is composed of SnO—P2O5—B2O3 glass.

Abstract: Disclosed here are methods for the preparation of optionally activated nanocrystalline rare earth phosphates. The optionally activated nanocrystalline rare earth phosphates may be used as one or more of quantum-splitting phosphor, visible-light emitting phosphor, vacuum-UV absorbing phosphor, and UV-emitting phosphor. Also disclosed herein are discharge lamps comprising the optionally activated nanocrystalline rare earth phosphates provided by these methods.

Abstract: A method of preparing a halophosphate phosphor represented by Formula 1, the method comprising: mixing a metallic precursor compound, which comprises strontium pyrophosphate, strontium chloride and strontium carbonate, and an activator precursor compound to form a mixture; sintering the mixture under an oxygen or air atmosphere to form a sintered mixture; milling the sintered mixture to form a milled product, and sintering the milled product under a reducing atmosphere: (Sr5-(x+y)AxM?y)(PO4)3Cl.(M2O3)z??Formula 1 wherein A is barium or calcium, M? is an activator and comprises at least one cation selected from the group consisting of Eu2+, Mn2+, Sb2+, Ce3+, Pr3+, Nd3+, Sm3+, Tb3+, Dy3+, Ho3+, Er3+, Yb3+ and Bi3+, M is aluminum, yttrium or lanthanum, 0?x?4.8, 0<y?0.2, and 0?z<0.1.

Abstract: A method ensuring that a CaMgSi2O6:Eu2+ blue light-emitting phosphor having high emission intensity can be produced in an industrially advantageous manner is provided. The production method includes a step of mixing a calcium source powder, a europium source powder, a magnesium source powder and a silicon source powder composed of silicon diimide powder or the like in a ratio producing a CaMgSi2O6:Eu2+ blue light-emitting phosphor, and a step of subjecting the powder mixture to heating at a temperature of 400 to 1,000° C. in an oxygen-containing gas atmosphere and then firing at a temperature of 800 to 1,500° C. in a reducing gas atmosphere.

Abstract: An object of the present invention is to provide a phosphorescent phosphor having an excellent afterglow luminance after 10 to 12 hours after sunset under the outdoor excitation conditions. The phosphorescent phosphor is represented by the formula (Sr1-a-b-x-yMgaBabEuxDyy)Al2O4, wherein a satisfies a relation 0.02?a?0.1, b satisfies a relation 0.03?b?0.15, x satisfies a relation 0.001?x?0.04, y satisfies a relation 0.004?y?0.05, and (a+b) satisfies a relation 0.08?(a+b)?0.2. The phosphorescent phosphor has an excellent afterglow luminance after a long period of period of time in a manner most suitable for outdoor applications.

Abstract: Terbium doped phosphate-based green luminescent material and preparation method thereof are provided. The chemical formula of the material is M3RE1-xTbx(PO4)3, wherein, M is alkaline-earth metals, RE is rare-earth elements, x is in a range of 0.001 to 1. The preparation method of the material includes the following steps; providing the compound used as the source of alkaline earth metal, the compound used as the source of phosphate, the compound used as the source of rare-earth, and the compound used as the source of Tb3+ according to the molar ratio of the elements in M3RE1-xTbx(PO4)3, wherein, the compound used as the source of phosphate is added at excess molar ratio in a range of 10% to 30%; mixing and grinding the compound to get mixture; sintering the mixture as pre-treatment, and then cooling the mixture to get a sintered matter; grinding; calcining in reducing atmosphere, and then cooling them.

Abstract: Provided are a borosilicate luminescent material and a preparing method thereof. The borosilicate luminescent material has a chemical formula of aM2O.bLn2O3.cAl2O3.dR2O3.eSiO2.fCeO2.gTb2O3, wherein M is alkaline earth metal or alkali metal, Ln is one or two elements selected from the group consisting of elements Y and Gd; R is one or two elements selected from the group consisting of elements B and P; a, b, c, d, e, f, and g are molar fractions, and 6?a?20, 3?b?12, 20?c?30, 32?d?45, 0?e?12, 0.01?f?1, and 0.05?g?1.5. The preparing methods comprises the following steps: 1) selecting source compounds of above elements; 2) mixing and grinding the source compounds to obtain a mixture; 3) presintering the mixture, then grinding the same; 4) sintering under reducing atmosphere, and cooling, thereby obtaining the borosilicate luminescent material.

Abstract: Compounds, phosphor materials and apparatus related to nacaphite family of materials are presented. Potassium and rubidium based nacaphite family compounds and phosphors designed by doping divalent rare earth elements in the sites of alkaline earth metals in the nacaphite material families are descried. An apparatus comprising the phosphors based on the nacaphite family materials are presented herein. The compounds presented is of formula A2B1-yRyPO4X where the elements A, B, R, X and suffix y are defined such that A is potassium, rubidium, or a combination of potassium and rubidium and B is calcium, strontium, barium, or a combination of any of calcium, strontium and barium. X is fluorine, chlorine, or a combination of fluorine and chlorine, R is europium, samarium, ytterbium, or a combination of any of europium, samarium, and ytterbium, and y ranges from 0 to about 0.1.

Abstract: The composition of the invention is of the type comprising particles formed by a mineral core and a shell that covers the mineral core uniformly, said shell being based on a phosphate of cerium and/or of terbium, optionally with lanthanum. The composition is characterized in that it contains sodium at a concentration of at most 7000 ppm. The phosphor of the invention is obtained by calcination of the composition at at least 1000 DEG C.

Abstract: Disclosed herein are cerium doped, garnet phosphors emitting in the yellow region of the spectrum, and having the general formula (Y,A)3(Al,B)5(O,C)12:Ce3+, where A is Tb, Gd, Sm, La, Sr, Ba, Ca, and/or Mg, and substitutes for Y, B is Si, Ge, B, P, and/or Ga, and substitutes for Al, and C is F, Cl, N, and/or S, where C substitutes for O. Relative to a solid-state-reaction method, the instant co-precipitation methods provide a more homogeneous mixing environment to enhance the distribution of the Ce3+ activator in the YAG matrix. Such a uniform distribution has the benefit of an increased emission intensity. The primary particle size of the as-prepared phosphor is about 200 nm, with a narrow distribution.

Abstract: A material of phosphorus-doped lithium titanium oxide with spinel structure includes a plurality of lithium titanium oxide particles, wherein a portion or the entirety of the surface layer of the lithium titanium oxide particle is doped with phosphorus. The surface layer is from 1 to 10 nanometers in thickness. Alternatively, the entire lithium titanium oxide particle can be doped with phosphorus. The material can be in powdered form, including a plurality of micro-scale particles each constituted by a plurality of the lithium titanium oxide particles.

Abstract: Disclosed is a phosphor composite material which can be fired at low temperatures and enables to obtain a phosphor composite member which is excellent in weather resistance and reduced in deterioration after long use. Also disclosed is a phosphor composite member obtained by firing such a phosphor composite material. Specifically disclosed is a phosphor composite material composed of a glass powder and a phosphor powder, which is characterized in that the glass powder is composed of SnO—P2O5—B2O3 glass.

Abstract: Disclosed herein are green-emitting, garnet-based phosphors having the formula (Lu1-a-b-cYaTbbAc)3(Al1-dBd)5(O1-eCe)12:Ce,Eu, where A is selected from the group consisting of Mg, Sr, Ca, and Ba; B is selected from the group consisting of Ga and In; C is selected from the group consisting of F, Cl, and Br; and 0?a?1; 0?b?1; 0<c?0.5; 0?d?1; and 0<e?0.2. These phosphors are distinguished from anything in the art by nature of their inclusion of both an alkaline earth and a halogen. Their peak emission wavelength may lie between about 500 nm and 540 nm; in one embodiment, the phosphor (Lu,Y,A)3Al5(O,F,Cl)12:Eu2+ has an emission at 540 nm. The FWHM of the emission peak lies between 80 nm and 150 nm. The present green garnet phosphors may be combined with a red-emitting, nitride-based phosphor such as CaAlSiN3 to produce white light.

Abstract: A red light fluorescent material adapted for being excited by a first light to emit a red light is provided. The red light fluorescent material has the chemical formula (1) presented below, A2Eu(MO4)(PO4)??(1), in which A represents Li, Na, K, Rb, Cs, or Ag, and M represents Mo, W, or a combination thereof (MoxW(1?x)). The red light fluorescent material can provide a red light with high luminance and good color purity. Moreover, since the composition of the red light fluorescent material includes oxides, the red light fluorescent material has high chemical stability and long lifetime.

Abstract: A composition of including particles that have a mineral core and a shell that uniformly covers the mineral core is described. The shell can be made of a cerium and/or terbium phosphate, or optionally with lanthanum. The composition can include potassium at a maximum potassium content of 7000 ppm. A phosphor obtained by calcining the composition at at least 1000° C. is also described.

Abstract: Compounds, phosphor materials and apparatus related to nacaphite family of materials are presented. Potassium and rubidium based nacaphite family compounds and phosphors designed by doping divalent rare earth elements in the sites of alkaline earth metals in the nacaphite material families are descried. An apparatus comprising the phosphors based on the nacaphite family materials are presented herein. The compounds presented is of formula A2B1-yRyPO4X where the elements A, B, R, X and suffix y are defined such that A is potassium, rubidium, or a combination of potassium and rubidium and B is calcium, strontium, barium, or a combination of any of calcium, strontium and barium. X is fluorine, chlorine, or a combination of fluorine and chlorine, R is europium, samarium, ytterbium, or a combination of any of europium, samarium, and ytterbium, and y ranges from 0 to about 0.1.

Abstract: Provided is a phosphate nano phosphor with a mean particle diameter of 100 to 3000 nm. Also provided is a method of preparing a nano phosphor, the method comprising: dissolving two or more species of metal precursor compounds in water, and then adjusting the pH to prepare an aqueous solution of pH 4-10; coprecipitating the aqueous solution by mixing with a phosphate precursor aqueous solution with the pH adjusted to 7-12; and redispersing the particles obtained from the coprecipitation in water or polyol solvent, and then heat treating the particles. The phosphate nano phosphor according to the present invention has superior light emission efficiency compared with conventional nano phosphors.

Abstract: A composition including an inorganic core and a europium and yttrium oxide or gadolinium shell uniformly covering the inorganic core at a thickness greater than or equal to 300 nm is described. A phosphor including the composition is also described. In addition a process of forming the composition by: forming a suspension including the inorganic core with pH of 8 to 11; adding a solution including a europium salt and yttrium or gadolinium salt to the suspension and maintaining the pH of the reaction medium at a constant value; and separating the formed solid and calcining the same to a temperature of at most 1000° C. is described.

Abstract: A fluorescent substance which excels in light-emitting characteristics and versatility, and which can emit light stably, and a lamp using the same are provided at a low cost. Such a fluorescent substance consists of a fluorescent substance which mainly consists of a garnet structure and an element of group V added thereto. Preferably, the fluorescent substance includes a fluorescent substance having a garnet structure in which yttrium.aluminum.garnet (Y3Al5O12) is contained as a base component, and further an activator.

Abstract: A phosphate containing particles including a mineral core and a lanthanum cerium terbium phosphate shell uniformly coating the mineral core with a thickness greater than or equal to 300 nm is described. The particles can have a mean diameter between 3 ?m and 6 ?m and the lanthanum cerium terbium phosphate can have the following general formula (1): La(1-x-y)CexTbyPO4 (1), wherein x and y comply with the following conditions: 0.4?x?0.7 and 0.13?y?0.17. A phosphor including the above-described phosphate is also described.

Abstract: A phosphor has a chemical formula of: Am(Ba1-xEux)nPyOz, wherein A is at least one of the group consisting of Li, Na and K, while 0<m<10, 0<n<10, 0<y<10, m+n+y=3/4 z, and 0.001<x<0.8.

Abstract: A rare earth (Ln) phosphate is described, wherein Ln is either: (1) at least one rare earth selected from cerium and terbium, or (2) lanthanum in combination with at least one of the two above-mentioned rare earths, and wherein the phosphate has a crystalline structure of the monazite type with a potassium content of at most 6000 ppm. The phosphate can be obtained by the precipitation of a rare earth chloride at a constant pH lower than 2, by calcination at a temperature of at least 700° C. and by redispersion in hot water. A phosphor obtained by calcination of said phosphate at at least 1000° C. is also described.

Abstract: A rare earth (Ln) phosphate is described, wherein Ln is either: (1) at least one rare earth selected from cerium and terbium, or (2) lanthanum in combination with at least one of the two above-mentioned rare earths and wherein the phosphate has a crystalline structure of the rhabdophane type or of the mixed rhabdophane/monazite type with a potassium content of 7000 ppm at most. The phosphate can be obtained by the precipitation of a rare earth chloride at a constant pH lower than 2, by calcination at a temperature lower than 500° C. and by redispersion in hot water. A phosphor obtained by the calcination of the phosphate at at least 1000° C. is also described.

Abstract: A rare earth element phosphate (Ln) is described, wherein Ln is either: (1) at least one rare earth element selected from cerium and terbium, or (2) lanthanum in combination with at least one of the above two rare earth elements, and wherein the phosphate has a crystalline structure of the rhabdophane type or of the monazite type with a lithium content of at most 300 ppm. The phosphate is obtained by the precipitation of a rare earth element chloride at a constant pH lower than 2, and then calcining and redispersing the same in hot water. A phosphor obtained by calcining the phosphate at at least 1000° C. is also described.

Abstract: A rare earth element phosphate (Ln) is described, wherein Ln is either: (1) at least one rare earth element selected from cerium and terbium, or (2) lanthanum in combination with at least one of the above two rare earth elements, and wherein the phosphate has a crystalline structure either of the rhabdophane type with a sodium content of at most 6000 ppm, or of the monazite type with a sodium content of at most 4000 ppm. The phosphate can be obtained by the precipitation of a rare earth element chloride at a constant pH lower than 2, and then calcining and redispersing the same in hot water. A phosphor obtained by calcining the phosphate at at least 1000° C. is also described.

Abstract: Provided is a fluorescent body for use in a near-ultraviolet excitation light-emitting element, comprising the compound given by formula (1), having part of element M1 and/or M2 therein replaced by an activation element (M3). M1aM2bPcO15(1) (Here, M1 represents one or more elements chosen from the group comprising Ca, Sr, and Ba; M2 represents one or more elements chosen from the group comprising Mg and Zn; a is a number between 1.5 and 2.5, inclusive; b is a number between 2.5 and 3.5, inclusive; and c is a number between 3.5 and 4.5, inclusive.) A fluorescent body in which M1 is Sr and M2 is Mg, and a fluorescent body in which M3 is Eu are preferable. Also provided are a fluorescent paste having the fluorescent body, and a near-ultraviolet excitation light-emitting element having the fluorescent body and having a high luminescent intensity.

Abstract: A green phosphor, a plasma display panel (PDP) including the same, and a method for making the same. In one example, the green phosphor includes strontium (Sr); aluminum (Al); europium (Eu); and at least one element (M) selected from the group consisting of phosphorous (P), arsenic (As), antimony (Sb), and bismuth (Bi).

Abstract: The use of surfactants that do not themselves act as dopants and are isoelectronic with either the group III or group V host atoms during OMVPE growth significantly reduces the incorporation of background impurities such as carbon, oxygen, sulfur and/or silicon. For example, the use of the surfactants Sb or Bi significantly reduces the incorporation of background impurities such as carbon, oxygen, sulfur and/or silicon during the OMVPE growth of III/V semiconductor materials, for example GaAs, GaInP, and GaP layers. As a result, an effective method for controlling the incorporation of impurity atoms is adding a minute amount of surfactant during OMVPE growth.

Abstract: The present invention provides a method of producing a crystalline metal sulfide nanostructure. The method comprising: providing a metal precursor solution and providing a sulfur precursor solution; placing a porous membrane between the metal precursor solution and the sulfur precursor solution, wherein metal cations of the metal precursor solution and sulfur ions of the sulfur precursor solution react, thereby producing a crystalline metal sulfide nanostructure, wherein the metal is a transitional metal or a Group IV metal.

Abstract: Phosphate particulates of at least one rare-earth metal (Ln), with Ln being at least one rare-earth metal selected from among cerium and terbium and optionally lanthanum are in the form of a suspension in a liquid phase of primary isotropic monocrystalline monazite particles having an average size of at least 25 nm and agglomerated into secondary particles having an average size of at most 400 nm; useful luminophores are produced from such phosphate particulates.