Abstract: A zinc aluminate fluorescent material is provided having a formula: Zn1-xAl2O4:Mnx@Al2O3@My; wherein M is at least one metal nanoparticles selected from the group consisting of Ag, Au, Pt, Pd, and Cu; 0<x?0.1; y is a mole ratio of M to Al, and 0<y?1×10?2; @ represents coating, in the zinc aluminate fluorescent material, M serves as a core, Al2O3 serves as an intermediate layer shell, and Zn1-xAl2O4:Mnx serves as an outer layer shell. In the zinc aluminate fluorescent material, a core-shell structure is formed by coating at least one metal nanoparticles selected from the group consisting of Ag, Au, Pt, Pd, and Cu, since metal nanoparticles can improve the internal quantum efficiency of the fluorescent material, the zinc aluminate fluorescent material exhibits a higher luminous intensity. A method of preparing the zinc aluminate fluorescent material is also provided.

Abstract: The present invention provides a method of preparing aluminum-doped zinc oxide (AZO) nanocrystals. In an exemplary embodiment, the method includes (1) injecting a precursor mixture of a zinc precursor, an aluminum precursor, an amine, and a fatty acid in a solution of a vicinal diol in a non-coordinating solvent, thereby resulting in a reaction mixture, (2) precipitating the nanocrystals from the reaction mixture, thereby resulting in a final precipitate, and (3) dissolving the final precipitate in an apolar solvent. The present invention also provides a dispersion. In an exemplary embodiment, the dispersion includes (1) nanocrystals that are well separated from each other, where the nanocrystals are coated with surfactants and (2) an apolar solvent where the nanocrystals are suspended in the apolar solvent. The present invention also provides a film. In an exemplary embodiment, the film includes (1) a substrate and (2) nanocrystals that are evenly distributed on the substrate.

Abstract: Materials, compounds, systems, and methods of dosing fluorescent lamps to reduce run-up time by improving mercury release rates. A pellet comprises a core and a coating on at least a portion of the surface of the core, the coating being formed from a powder of one or more intermetallic compounds comprising mercury. A method comprises providing a core and forming a coating on at least a portion of the surface of the core with a material comprising one or more intermetallic compounds comprising mercury and a metal selected from the group consisting of silver, copper, tin, zinc, bismuth, gold, platinum, palladium, nickel, manganese, and titanium.

Abstract: A scintillator material is made of a zinc-oxide single crystal grown on a +C surface or a ?C surface of a plate-shaped seed crystal of zinc oxide including a C surface as a main surface. The zinc-oxide single crystal contains In and Li. In response to an incident radiation, the scintillator material emits fluorescence of less than 20-ps fluorescence lifetime.

Abstract: The present invention is a method of producing an ultraviolet light emitting phosphor material. This method includes a step of heat-treating a composition containing zinc and oxygen as main components and at least one selected from the group consisting of aluminum, gallium and indium as a sub-component, in the presence of at least two coexisting substances selected from the group consisting of zinc oxide, gallium oxide and phosphorus oxide under a non-oxidizing atmosphere.

Abstract: A photonic crystal phosphor includes a phosphor which absorbs light and emits excited light having a radiation spectrum, a first coating layer covering the phosphor and having a first thickness, and a second coating layer covering the phosphor and having a second thickness. The first coating layer has a first refractive index. The second coating layer has a second refractive index. The first coating layer is between the phosphor and the second coating layer.

Abstract: The present invention relates to ZnO green luminescent material and its preparation. The ZnO green luminescent material is prepared by doping a trivalent rare earth ion compound and a Li compound into zinc oxide material. The method comprises the following steps: (1) weighing raw material in the stoichiometric ratio of formula ZnO: xA, yLi, (2) grinding the raw material, sintering it at 800-1200° C. for 2-8 h, cooling to the room temperature, and then obtaining the ZnO green luminescent material. The present ZnO green luminescent material doped with trivalent rare earth ion compound and Li compound has high stability and luminous intensity, and has higher low-voltage cathode ray luminescence efficiency. The method can easily be operated and can be used widely.

Abstract: A method of producing nanoparticles comprises effecting conversion of a nanoparticle precursor composition to the material of the nanoparticles. The precursor composition comprises a first precursor species containing a first ion to be incorporated into the growing nanoparticles and a separate second precursor species containing a second ion to be incorporated into the growing nanoparticles. The conversion is effected in the presence of a molecular cluster compound under conditions permitting seeding and growth of the nanoparticles.

Abstract: Borate phosphors have a formula Zn1-x-yB2O4:Eu3+x, Bi3+y (wherein 0?x?0.6 and 0?y?0.6) emit visible light under the excitation of ultraviolet light or blue light, and may be further collocated with different colored phosphors to provide a white light illumination device.

Abstract: A preparation method of zinc manganese silicate is provided. The method includes the following steps: step 1, preparing silicon dioxide sol with distilled water, anhydrous ethanol and tetraethyl orthosilicate; step 2, preparing a mixture solution of a zinc salt and a manganese salt; step 3, adjusting the silicon dioxide sol to be neutral or acidic; step 4, adding the mixture solution of the zinc salt and the manganese salt into the silicon dioxide sol to form a gelatin; step 5, drying the gelatin, keeping the temperature, grinding, reducing with keeping the temperature in a reductive atmosphere to obtain zinc manganese silicate. The preparation method has simple technique and low equipment requirement. The particles of the zinc manganese silicate phosphor prepared by the method have a regular size, uniform shape and good luminescent performance.

Abstract: A detector for detecting high-energy radiation is disclosed. The detector includes scintillating material with a garnet structure includes gadolinium, yttrium, cerium, gallium, and aluminum. The scintillating material is expressed as (Gd1?x?y?zYxAyCez)3+u(Ga1?m?nAlmDn)5?uO12:wFO, wherein A is lutetium, lanthanum, terbium, dysprosium, or a combination thereof; D is indium, scandium, or a combination thereof; F is a divalent ion; 0?x<0.2, 0<y<0.5, 0.001<z<0.05, 0<u<0.1, 0?n<0.2, 0.3<m<0.6, and 10 ppm?w?300 ppm; and y/x>1.

Abstract: A color-adjustable luminescent powder is provided, the chemical general formula of which is (YaGdbEuc)2O3·xZn(1-m)AlmO, wherein 0?a?0.99, 0?b?0.99, 0.01?c?0.08, provided that a+b+c=1 and a and b are not 0 simultaneously; x is the molar ratio between Zn(1-m)AlmO and (YaGdbEuc)2O3, 0.01?x?0.20, and 0.001?m?0.05. A preparation method of the above luminescent powder is also provided, which comprises the following steps: adding an aqueous alcohol solution containing a complexing agent, and a surfactant to a mixed solution containing needed components to obtain a precursor solution, then aging the precursor solution, undergoing calcination treatment and cooling to obtain the said luminescent powder.

Abstract: A yellow phosphor having oxyapatite structure, preparation method and white light-emitting diode thereof are disclosed. The yellow phosphor has a chemical formula of (A1?xEux)8?yB2+y(PO4)6?y(SiO4)y(O1?zSz)2, wherein A and Eu are divalent metal ions, B is a trivalent metal ion, 0<x?0.6, 0?y?6, and 0?z?1. A can be an alkaline earth metal, Mn or Zn. B can be a group 13 metal, a rare earth meal or Bi.

Abstract: Phosphors based on doping of an activator (an emitter) into a host matrix are disclosed herein. Such phosphors include alkaline gallate phosphors doped with Cr3+ or Ni2+ ions, which in some embodiments can exhibit persistent infrared phosphorescence for as long as 200 hours. Such phosphors can be used, for example, as components of a luminescent paint.

Abstract: A scintillator material is made of a zinc-oxide single crystal grown on a +C surface or a ?C surface of a plate-shaped seed crystal of zinc oxide including a C surface as a main surface. The zinc-oxide single crystal contains In and Li. In response to an incident radiation, the scintillator material emits fluorescence of less than 20-ps fluorescence lifetime.

Abstract: Fluorescent materials and preparation methods thereof are provided. The fluorescent materials are represented by the general formula: Y2O3: Re, M, Zn1-xAlxO, wherein Re is at least one selected from Eu and Tb, M is at least one selected from Ag, Au, Pt and Pd in the form of nano-particle, and 0<x?0.05. The said methods include the following steps: step 1, preparing a colloid of Zn1-xAlxO; step 2, preparing a colloid of Y and Re containing the metal element M; step 3, mixing the colloid of Zn1-xAlxO with the colloid of Y and Re, aging and heating treatment to form the fluorescent materials. Compared to the Y2O3 fluorescent materials in the art the present fluorescent materials have higher luminescence efficiency, conductivity, long life and industrial applicability.

Abstract: Disclosed herein are emissive ceramic elements having low amounts of certain trace elements. Applicants have surprisingly found that a lower internal quantum efficiency (IQE) may be attributed to specific trace elements that, even at very low amounts (e.g., 50 ppm or less), can cause significant deleterious effects on IQE. In some embodiments, the emissive ceramic element includes a garnet host material and an amount of Ce dopant. The emissive ceramic element may, in some embodiments, have an amount of Na in the composition less than about 67 ppm, an amount of Mg in the composition less than about 23 ppm, or an amount of Fe in the composition less than about 21 ppm.

Abstract: Fluorescent materials used in field emission and preparation methods thereof are provided. The said fluorescent materials are a mixture consisting of Zn1-xAlxO, europium yttrium oxide or terbium yttrium oxide, wherein 0<x?0.05. The said methods include the following steps: step 1, preparing Zn1-xAlxO, wherein 0<x?0.05; step 2, weighing yttrium oxide or yttrium oxalate and europium oxide or terbium oxide or oxalate thereof, grinding to form a mixture; step 3, mixing Zn1-xAlxO with the mixture in step 2, stirring, drying to form a mixture; step 4, calcining the mixture in step 3 to form the said fluorescent material used in field emission. The fluorescent materials increase luminescent intensity and the said preparation methods have simple technique, low equipment requirement and short preparation cycle.

Abstract: Phosphors based on doping of an activator (an emitter) into a host matrix are disclosed herein. Such phosphors include alkaline gallate phosphors doped with Cr3+ or Ni2+ ions, which in some embodiments can exhibit persistent infrared phosphorescence for as long as 200 hours. Such phosphors can be used, for example, as components of a luminescent paint.

Abstract: A green phosphor for a plasma display panel and a plasma display panel including the same, the green phosphor including a first phosphor of YAl5O12:Ce, and a second phosphor of Zn1-xMgx (Ga1-yAly)2O4:Mn, wherein 0?x<1, 0?y<1.

Abstract: Exemplary embodiments of the present invention relate to inorganic phosphors based on silicate compounds having improved stability under a resulting radiation load and resistance to atmospheric humidity, which are capable of converting higher-energy excitation radiation, i.e. ultraviolet (UV) or blue light, with high efficiency into a longer-wavelength radiation which may be in the visible spectral range. A calcium molar fraction x having a value between 0 and 0.05 is added to a silicate phosphor having the general formula Sr3-x-y-zCaxMIIySiO5:Euz.

Abstract: The present invention relates to ZnO green luminescent material and its preparation. The ZnO green luminescent material is prepared by doping a trivalent rare earth ion compound and a Li compound into zinc oxide material. The method comprises the following steps: (1) weighing raw material in the stoichiometric ratio of formula ZnO: xA, yLi, (2) grinding the raw material, sintering it at 800-1200° C. for 2-8 h, cooling to the room temperature, and then obtaining the ZnO green luminescent material. The present ZnO green luminescent material doped with trivalent rare earth ion compound and Li compound has high stability and luminous intensity, and has higher low-voltage cathode ray luminescence efficiency. The method can easily be operated and can be used widely.

Abstract: This disclosure features a persistent phosphor having the following formula I: Sra,Cab,BacAl2-m-n-o-pOd:Euy,REz,Bm,Znn,Coo,Scp??I where a and b each range from about 0.3 to about 0.7; c is between about 0 and about 0.1; 0.75?a+b+c+y+z?1.3; y is between about 0.0005 and about 0.1; RE is any rare earth element alone or in combination; z is between about 0.0005 and about 0.15; m is between about 0.0005 and about 0.30; n is between about 0 and about 0.10; o is between about 0 and about 0.01; p is between about 0 and about 0.10 and d ranges from about 3.945 to about 4.075. Once the persistent phosphor has been excited it appears white in an absence of ambient light. Also featured is an article of manufacture that includes the phosphor.

Abstract: A method of making LSO scintillators with high light yield and short decay times is disclosed. In one arrangement, the method includes codoping LSO with cerium and another dopant from the IIA or IIB group of the periodic table of elements. The doping levels are chosen to tune the decay time of scintillation pulse within a broader range (between about ˜30 ns up to about ˜50 ns) than reported in the literature, with improved light yield and uniformity. In another arrangement, relative concentrations of dopants are chosen to achieve the desired light yield and decay time while ensuring crystal growth stability.

Abstract: A method of making LSO scintillators with high light yield and short decay times is disclosed. In one arrangement, the method includes codoping LSO with cerium and another dopant from the IIA or IIB group of the periodic table of elements. The doping levels are chosen to tune the decay time of scintillation pulse within a broader range (between about ˜30 ns up to about ˜50 ns) than reported in the literature, with improved light yield and uniformity. In another arrangement, relative concentrations of dopants are chosen to achieve the desired light yield and decay time while ensuring crystal growth stability.

Abstract: According to the present invention, a fluorescent powder composed mainly of an acicular or fibrous zinc oxide single crystal with an aspect ratio of 5 or higher is produced by the following steps: a step of producing a raw material solution selected from the group consisting of a raw material solution (A) that is an alkali solution containing zing ions, a raw material solution (B) that is a solution containing zinc ions and ions of dopant element, and a mixed solution of the raw material solution (A) and the raw material solution (B); and a hydrothermal reaction step wherein a hydrothermal reaction of the mixed solution is carried out in a hermetically sealed vessel at a subcritical or supercritical temperature and at a subcritical or supercritical pressure. A zinc oxide single crystal powder can be produced at low cost without the need for a pulverization step or a similar step and high-density orientation can be realized by such crystal powder.

Abstract: Provided is an apparatus for producing magnesium-containing zinc oxide, including: zinc vapor producing means 11 which produces zinc vapor by heating metallic zinc; magnesium vapor producing means 15 which produces magnesium vapor by heating metallic magnesium; mixed vapor producing means 20 which produces mixed vapor by mixing the zinc vapor and the magnesium vapor; and oxidizing gas contact means 19 which produces magnesium-containing zinc oxide by bringing an oxidizing gas into contact with the mixed vapor. The content of zinc in the mixed vapor is adjusted to be higher than that of magnesium.

Abstract: To provide a phosphor for manufacturing an one chip type LED illumination, etc, by combining a near ultraviolet/ultraviolet LED and a blue LED, and having an excellent emission efficiency including luminance. The phosphor is given as a general composition formula expressed by MmAaBbOoNn:Z, (where element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is one or more kinds of elements acting as an activator.), satisfying a=(1+x)×m, b=(4?x)×m, o=x×m, n=(7?x)×m, 0?x?1, wherein when excited by light in a wavelength range from 300 nm to 500 nm, the phosphor has an emission spectrum with a peak wavelength in a range from 500 nm to 620 nm.

Abstract: Disclosed are non stoichiometric Copper Alkaline Earth Silicate phosphors activated by divalent europium for using them as high temperature stable luminescent materials for ultraviolet or daylight excitation. The phosphors are represented as the formula (BauSrvCawCux)3?y(Zn,Mg,Mn)zSi1+bO5+2b:Eua. The nonstoichiometric tetragonal silicate is prepared in a high temperature solid state reaction with a surplus of silica in the starting mixture. Furthermore, luminescent tetragonal Copper Alkaline Earth Silicates are provided for LED applications, which have a high color temperature range from about 2,000K to 8,000K or 10,000K showing a CRI with Ra=80˜95, when mixed with other luminescent materials.

Abstract: The present invention provides a fluorescent substance excellent both in quantum efficiency and in temperature characteristics, and also provides a process for producing the fluorescent substance. This fluorescent substance is an oxynitride phosphor having a low paramagnetic defect density and comprising aluminum, silicon, either or both of oxygen and nitrogen, and a metal element M, provided that the metal element M is partly replaced with an emission center element R. That phosphor can be produced by the steps of: subjecting a mixture of starting materials to heat treatment under a nitrogen atmosphere so as to obtain an intermediate fired product, and then further subjecting the intermediate fired product to heat treatment under an atmosphere of nitrogen-hydrogen mixed gas.

Abstract: A display device comprising at least one phosphor layer, the phosphor layer containing a green phosphor represented by the following formula: (A1-xBx) (Zn1-yMny) Al10O17 wherein, A is an element selected from Ca, Ba and Sr, B is a rare-earth element, x is a number satisfying 0.0001?x?0.1, and y is a number satisfying 0.02?y?0.14.

Abstract: A blue phosphor, which has excellent durability and high brightness, and in particular a blue phosphor in a powder state, which can realize high-brightness luminescence upon exposure to an electron beam, are provided. The phosphor being characterized by comprising at least europium incorporated as a solid solution into an inorganic crystal having a crystal structure of an AlN crystal or an AlN solid solution crystal, wherein the phosphor emits divalent europium-derived fluorescence having a peak at a wavelength in the range of 430 nm to 500 nm upon exposure to an excitation source, is provided. In this case, it is more preferable that a predetermined metal element and silicon are incorporated therein. And a manufacturing method to manufacture such phosphor is also provided. Further, a lighting device comprising such blue phosphor is provided.

Abstract: The present application provides a new composition of matter in the form of a new compound semiconductor family of the type group Zn-(II)-III-N, where III denotes one or more elements in Group III of the periodic table and (II) denotes one or more optional further elements in Group II of the periodic table. Members of this family include for example, ZnGaN, ZnInN, ZnInGaN, ZnAlN, ZnAlGaN, ZnAlInN or ZnAlGaInN. This type of compound semiconductor material is not previously known in the prior art. The composition of the new Zn-(II)-III-N compound semiconductor material can be controlled in order to tailor its band-gap and light emission properties. Efficient light emission in the ultraviolet-visible-infrared wavelength range is demonstrated. The products of this invention are useful as constituents of optoelectronic devices such as solar cells, light emitting diodes, laser diodes and as a light emitting phosphor material for LEDs and emissive EL displays.

Abstract: It is provided a fluorescent zirconia material including a fluorescent component and emitting fluorescence when excited with a light of a predetermined wavelength, the fluorescent component including a fluorescent material, the fluorescent material including at least one kind of Y2SiO5:Ce, Y2SiO5:Tb, (Y, Gd, Eu)BO3, Y2O3:Eu, YAG:Ce, ZnGa2O4:Zn and BaMgAl10O17:Eu and the fluorescent material being capable of emiting the fluorescence when subjected to firing treatment at temperatures ranging from 1300 to 1600(° C.) under oxidizing environments.

Abstract: Methods for preparing core/shell nanocrystals are provided, using mismatched shell precursors and an electron transfer agent to control the nucleation and growth phases of particle formation.

Abstract: Provided is a process of forming a Cd and Se containing nanocrystalline composite. The nanocrystalline composite has a composition of one of (a) Cd, M, Se, (b) Cd, Se, A, and (c) Cd, M, Se, A, with M being an element of group (12) of the PSE other than Cd and A being an element of group (16) of the PSE other than O and Se. In one embodiment in a suitable solvent a solution of the element Cd, or a precursor thereof, and, where applicable, of M, or a precursor thereof is formed. To the solution the element Se and, where applicable, A is added and thereby a reaction mixture formed. The reaction mixture is heated for a sufficient period of time at a temperature suitable for forming the Cd and Se containing nanocrystalline composite and then the reaction mixture is allowed to cool. Finally the Cd and Se containing nanocrystalline composite isolated.

Abstract: A luminescent material is disclosed. The luminescent material may include a first compound having a host lattice comprising first ions and oxygen. A first portion of the first ions may be substituted by copper ions. In one embodiment, the host lattice may include silicon, the copper ions may be divalent copper ions and the first compound may have an Olivine crystal structure, ?-K.2SO4 crystal structure, a trigonal Glaserite (K3Na(SO4)2) or monoclinic Merwinite crystal structure, a tetragonal Ackermanite crystal structure, a tetragonal crystal structure or an orthorhombic crystal structure. In another embodiment, the copper ions do not act as luminescent ions upon excitation with the ultraviolet or visible light.

Abstract: Provided are a phosphor used in a PDP, which is a compound represented by Formula 1 below and a PDP including a phosphor layer comprising the phosphor. (Y1-x-yGdxTby)AlrQ3-r(BO3)4 ??Formula 1 where 0<x?1, 0<y?1, Q is Sc, In, or Ga, and 0?r<3. When the phosphor is used to form a green phosphor layer of a PDP, the luminance saturation problem of a conventional green phosphor can be overcome. In addition, a PDP including a phosphor layer comprising the phosphor has a wider color reproduction range and no reduction in luminance according to the mixing ratio of each phosphor contained in the phosphor compared with a conventional phosphor used in a PDP. Therefore, a PDP including a phosphor layer comprising the phosphor can have far superior image qualities.

Abstract: A persistent phosphor of formula I is provided, along with methods for making and using the phosphor: AxAlyO4:Euj,REk,Bm,Znn,Coo,Scp ??I wherein: A is Ba, Sr, Ca, or a combination of these metals; x is greater than about 0.75 and less than about 1.3; y is greater than or equal to about 1.6 and less than or equal to 2; j is greater than about 0.0005 and less than about 0.1; k is greater than about 0.0005 and less than about 0.1; m is greater than or equal to 0 and less than about 0.30; n is greater than 0 and less than about 0.10; o is greater than 0 and less than about 0.01; p is greater than 0 and less than about 0.05; and RE is Dy, Nd, or a combination thereof. Applications for such phosphors include use in toys, emergency equipment, clothing, and instrument panels, among others.

Abstract: This patent covers infrared phosphorescent materials which exhibit extended persistence lifetimes and are composed of mixtures of the elements zinc, antimony, gallium, tellurium, oxygen and nitrogen, and are doped with varying amounts of chromium, neodymium, dysprosium, yttrium or thulium. A typical formula is given by Zn(1-n %-m %-l %)SbxGa2-xTezO4+2z-yNy: n % Cr3+, m % P, l % Q, where Zn is zinc, Sb is antimony, Ga is gallium, Te is tellurium, O is oxygen, N is nitrogen. Additionally, x (0 to 2) y (0 to 0.5) and z (0 to 1) are the molar concentration in the composition. Cr3+ is the doped chromium ion, P is a codopant and Q is a second codopant and n, m, l are the concentration respectively (m,m,l are from 0.1 to 10). An example is the material ZnSbGaTeO5.95N0.05:3% Cr3+, 1% Nd3+, which has an emission peak at 760 nm and a persistent time of over 20 hours (measured with Fluorolog-3 spectrometer with a PMT detector).

Abstract: Exemplary embodiments of the present invention relate to inorganic phosphors based on silicate compounds having improved stability under a resulting radiation load and resistance to atmospheric humidity, which are capable of converting higher-energy excitation radiation, i.e. ultraviolet (UV) or blue light, with high efficiency into a longer-wavelength radiation which may be in the visible spectral range. A calcium molar fraction x having a value between 0 and 0.05 is added to a silicate phosphor having the general formula Sr3-x-y-zCaxMIIySiO5:Euz.

Abstract: This invention relates to luminescent materials for ultraviolet light or visible light excitation containing lead and/or copper doped chemical compounds. The luminescent material is composed of one or more than one compounds of aluminate type, silicate type, antimonate type, germanate/or germanate-silicate type, and/or phosphate type. Accordingly, the present invention is a good possibility to substitute earth alkaline ions by lead and copper for a shifting of the emission bands to longer or shorter wave length, respectively. Luminescent compounds containing copper and/or lead with improved luminescent properties and also with improved stability against water, humidity as well as other polar solvents are provided. The present invention is to provide lead and/or copper doped luminescent compounds, which has high color temperature range about 2,000K to 8,000K or 10,000K and CRI over 90.

Abstract: A luminescent material which is featured in that it exhibits an emission peak at a wavelength ranging from 490 to 580 nm as it is excited by light having a wavelength ranging from 250 to 500 nm and that it has a composition represented by the following general formula (2): (M1-xRx)a2AlSib2Oc2Nd2 ??(2) (In the general formula (2), M is at least one metallic element excluding Si and Al, R is a luminescence center element, and x, a2, b2, c2 and d2 satisfy the following relationships: 0<x?1, 0.93<a2<1.3, 4.0<b2<5.8 0.6<c2<1, 6<d2<11).

Abstract: A semiconductor nanocrystal heterostructure has a core of a first semiconductor material surrounded by an overcoating of a second semiconductor material. Upon excitation, one carrier can be substantially confined to the core and the other carrier can be substantially confined to the overcoating.

Abstract: Exemplary embodiments of the present invention disclose inorganic luminescent substances with Eu2+-doped silicate luminophores, in which solid solutions in the form of mixed phases between alkaline earth metal oxyorthosilicates and rare earth metal oxyorthosilicates are used as base lattices for the Eu2+ activation leading to the luminescence. These luminophores are described by the general formula (1-x) MII3SiO5.xSE2SiO5:Eu, in which MII preferably represents strontium ion or another alkaline earth metal ion, or another divalent metal ion selected from the group consisting of the magnesium, calcium, barium, copper, zinc, and manganese. These ions may be used in addition to strontium and also as mixtures with one another.

Abstract: Semiconductor nanocrystal compositions comprising magnesium containing shells and methods of preparing them are described. The compositions provide strong emission in the blue and green wavelengths as well as chemical and photostability that have not been achieved with conventional shell materials.

Abstract: There is described a method of producing a red-emitting manganese and cerium co-activated gadolinium magnesium zinc pentaborate phosphor that comprises combining a hydrated hexaborate of zinc, magnesium, and manganese with oxides of Gd and Ce to form a mixture, and firing the mixture in a slightly reducing atmosphere to form the phosphor. Preferably, the hydrated hexaborate has an approximate composition represented by (Zn,Mg,Mn)B6O10.XH2O, where X is 5.3 to 6.2.

Abstract: A green phosphor represented by Formula (A1-xTbx)a(B1-yMny)bCcOb+1.5(a+c), wherein A includes La, and Yb and/or Gd, B includes at least one kind selected from Mg, Zn, Sc, V, Cr, Co, Ni, Cu, In, Zr, Nb, Ta, Mo, and Sn, C includes at least one selected from Al, B, Ga, Si, P, Ti, Fe, B, and Ge, 0?x?1, 0?y?1, 0.8?a?1.2, 0<b?1.5, 8?c?30, and having a magnetoplumbite type crystal structure.

Abstract: This invention relates to luminescent materials for ultraviolet light or visible light excitation containing lead and/or copper doped chemical compounds. The luminescent material is composed of one or more than one compounds of aluminate type, silicate type, antimonate type, germanate/or germanate-silicate type, and/or phosphate type. Accordingly, the present invention is a good possibility to substitute earth alkaline ions by lead and copper for a shifting of the emission bands to longer or shorter wave length, respectively. Luminescent compounds containing copper and/or lead with improved luminescent properties and also with improved stability against water, humidity as well as other polar solvents are provided. The present invention is to provide lead and/or copper doped luminescent compounds, which has high color temperature range about 2,000K to 8,000K or 10,000K and CRI over 90.

Abstract: Provided are a ZnO-based substrate having a surface suitable for crystal growth, and a method of manufacturing the ZnO-based substrate. The ZnO-based substrate is made in a way that almost no hydroxide groups exist on a crystal growth-side surface of a MgxZn1-xO substrate (0?x<1). To this end, as a method of treating the substrate, a final treatment to be applied on the crystal growth-side surface of the MgxZn1-xO substrate (0?x<1) is acidic wet etching at pH 3 or lower. Thereby, it is possible to prevent production of a hydroxide of Zn, and to reduce the density of crystal defects in a thin film formed on the ZnO-based substrate.