Abstract: An emitting phosphor is provided, which can be excited by a blue LED or a near-UV LED, emit visible light and increase internal quantum efficiency. An emitting phosphor is proposed, comprising an orthorhombic crystal system comprising Ga and S, wherein the orthorhombic crystal system has, in an XRD pattern using a Cu K? beam, a proportion of the diffraction intensity of the maximum peak appearing at diffraction angle 2?=16.0 to 18.0° with respect to the diffraction intensity of the maximum peak appearing at diffraction angle 2?=23.6 to 24.8° of 0.4 or greater.

Abstract: A material, comprising a garnet having the composition represented by the formula A3?xB5O12:Dx and a barium-containing oxide. In the garnet A3?xB5O12:Dx, A is selected from lutetium, yttrium, gadolinium, terbium, scandium, another rare earth metal or mixtures thereof. B is selected from aluminum, scandium, gallium, indium, boron or mixtures thereof. D is at least one dopant selected from chromium, manganese and rare earth metals, particularly cerium, praseodymium or gadolinium. The dopant is present with x is 0?x?2.

Abstract: The present invention provides an Al—C—O based phosphor using neither heavy metal nor rare metal and composed of elements with high environmental compatibility and excellent economic efficiency, wherein the wavelength of the peak intensity of the emission spectrum can be changed without changing the basic composition. An aluminum oxide phosphor which comprises aluminum (Al), carbon (C), and oxygen (O) respectively in an amount of 30 mol %<Al<60 mol %, 0 mol %<C<10 mol %, 30 mol %<O<70 mol % is provided. The above problem is solved in the production of an Al—C—O phosphor comprising aluminum (Al), carbon (C), and oxygen (O) by heating and firing a mixture comprising an aluminum-containing compound and a coordinatable oxygen-containing compound.

Abstract: A scintillation device includes a ceramic scintillator body that includes a polycrystalline ceramic scintillating material comprising gadolinium. The polycrystalline ceramic scintillating material is characterized by a pyrochlore crystallographic structure. A method of producing a ceramic scintillator body includes preparing a precursor solution including a rare earth element precursor, a hafnium precursor, and an activator (Ac) precursor. The method also includes obtaining a precipitate from the solution and calcining the precipitate to produce a polycrystalline ceramic scintillating material including the rare earth element, hafnium, and the activator, and having a pyrochlore titrating the precursor solution into the precipitant solution structure.

Abstract: The present invention discloses a warm-white-light emitting diode has the substrate of indium gallium nitride (InGaN) heterojunction containing a large amount of quantum wells and having a light conversion polymer layer, characterized by that the light conversion polymer layer is uniform in concentration, the light-emitting surface and edges of the indium gallium nitride heterojunction are covered with a thermosetting polymer, and the light conversion polymer layer contains some fluorescent powders, which are formed as at least two particle layers in the light conversion polymer layer to ensure the light transmitted reaching 20% of the first-order blue light and 70˜80% of the second-order orange-yellow light from the indium gallium nitride heterojunction. The present invention also discloses a fluorescent powder.

Abstract: The invention relates to phosphors having a garnet structure of the formula I (Ya,Gdb,Luc,Sed,Sme,Tbf,Prg,Thh,Iri,Sbj,Bik)3-x(All,Gam)5O12:Cex??(I) where a+b+c+d+e+f+g+h+i+j+k=1 l+m=1 and x=0.005 to 0.1, and to a process for the preparation of these phosphors, and to the use thereof as conversion phosphors for conversion of the blue or near-UV emission from an LED.

Abstract: The solid scintillator according to the present invention is expressed by the following formula (1): [Formula 1] (M1-x-yGdxCey)3J5O12??(1) (wherein M is at least one element of La and Tb; J is at least one metal selected from the group consisting of Al, Ga, and In; and x and y are such that 0.5?x?1 and 0.000001?y?0.2). The transmittance of light having a wavelength of 550 nm measured at a thickness of 2 mm is equal to or greater than 40%. The solid scintillator according to the present invention can be manufactured at low cost, has a high light emitting power, and does not release Cd because Cd is not contained.

Abstract: The invention pertains to the field of lighting technology using InGaN-based blue LEDs and specifically to luminescent materials containing yttrium oxide, oxides of rare earth metals as well as aluminium oxide in proportions that yield a luminescent material whose average composition fits the general formula (Y1?x?yCex?Lny)3+?Al5O12+1.5?, where ?—defines increase in stoichiometric index over the known value for yttrium-gadolinium garnet and varies between 0.033 and 2; x—is atomic fraction of cerium, 0.0001-0.1; ?Lny—is one or more lanthanides from the Gd, Tb, La, Yb group, whose atomic fraction in an yttrium sub-lattice is 0.01<Gd<0.70; 0.001<Tb<0.2; 0.001<La<0.1; 0.001<Yb<0.1, respectively, while the difference for all the compositions [1?x?y]>0. For stoichiometric index (3+?) varying between 3.034 and 3.45, the proposed material is a phase of cubic structure.

Abstract: A scintillator having a host lattice of MgAl2O4 was prepared by hot pressing under a vacuum environment a powder mixture of MgAl2O4, CeO2, and LiF.

Abstract: An object of the present invention is to provide a solid scintillator having short afterglow and high output, and a radiation detector and a tomograph using the solid scintillator. A solid scintillator according to the present invention is a solid scintillator comprising a polycrystal containing a crystal of a Gd garnet structure oxide having a composition ratio represented by the following formula (1): [Formula 1] (M1-x-yGdxQy)3J5O12??(1) wherein M is at least one element of La and Tb, Q is at least one element of Ce and Pr, J is at least one element selected from Al, Ga, and In, x and y satisfy relations 0.5?x?1, and 0.000001?y?0.2, and further containing Si and fluorine, wherein the solid scintillator contains 1 ppm by mass to 1000 ppm by mass of the Si with respect to the Gd garnet structure oxide, and 1 ppm by mass to 100 ppm by mass of the fluorine with respect to the Gd garnet structure oxide.

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: The present invention provides methods and systems for moveable pieces of equipment comprising a passively charged photoluminescent material to improve visibility of the equipment in low light conditions. This moveable piece of equipment may be a piece of ground support equipment such as that used in support of an operation. Further, these operations may include, for example, nautical operations (e.g., Naval operations or ocean-going cargo transportation), construction of a structure (e.g., building construction), aviation (i.e., flight) operations (e.g., in support of an airport), transportation of goods (e.g., via rail or truck), drilling operations (e.g., drilling for oil, water, gas or explosives), mining operations, oil processing (refinery) operations etc.

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 Olivin crystal structure, a ?-K2SO4 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: 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: There is provided a method of making a SrB6O10:Pb phosphor that increases the manufactured quantity of the SrB6O10:Pb phosphor by approximately seven fold when using the same size reaction vessel, decreases the lead-containing waste stream, and eliminates the use of hazardous concentrated ammonium hydroxide. The UV emission brightness is equivalent to or better than the same phosphor when prepared using prior methods.

Abstract: Provided is a method for manufacturing MAl2O4:Eu,RE type long-lasting phosphor ceramics capable of producing the ceramics at a reduced raw material cost. In addition, provided is a sintered product of a long-lasting phosphor having no yellow body color. More specifically, provided are the method for manufacturing MAl2O4:Eu,RE type long-lasting phosphor ceramics in which M is an alkaline earth element and RE is a rare earth element other than europium, comprising mixing a BAM (alkaline earth aluminate) phosphor, an alkaline earth compound, an aluminum compound and a rare earth compound to form a mixture, and then firing the mixture; and a white MAl2O4:Eu,RE type long-lasting phosphor.

Abstract: The present invention provides high quality monodisperse or substantially monodisperse InAs nanocrystals in the as-prepared state. In some embodiments, the as-prepared substantially monodisperse InAs nanocrystals demonstrate a photoluminescence of between about 700 nm and 1400 nm.

Abstract: A light emitting device is disclosed. The light emitting device may include a light emitting diode (LED) for emitting light and a phosphor adjacent to the LED. The phosphor may be excitable by light emitted by the LED and may include a first compound having a host lattice comprising first ions and oxygen. In one embodiment, the host lattice may include silicon, the copper ions may be divalent copper ions and the first compound may have an Olivin crystal structure, a ?-K2SO4 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 light emitted by the LED.

Abstract: Phosphor compositions, white phosphor compositions, methods of making white phosphor compositions, tinted white phosphor compositions, methods of making tinted white phosphor compositions, LEDs, methods of making LEDs, light bulb structures, paints including phosphor compositions, polymer compositions including phosphor compositions, ceramics including phosphor compositions, and the like are provided.

Abstract: Disclosed are violet, blue, and green phosphors having excellent durability and high luminance. Specifically disclosed is a phosphor which contains a metal element M (M is at least one element selected from among Mn, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Tm and Yb) for constituting a metal ion, which is solid-solubilized in an AlON crystal, an AlON solid solution crystal or an inorganic crystal having the same crystal structure as AlON. The phosphor is capable of emitting fluorescence having a peak in the wavelength range from 300 nm to 700 nm. Also disclosed is a method for producing such a phosphor. Further disclosed are an illuminating device and an image display each containing such a phosphor.

Abstract: A method of producing an M-C—N—O based phosphor with reduced non-uniform emission and improved color purity is provided. The method of producing an M-C—N—O based phosphor comprising a group IIIB element (M), carbon (C), nitrogen (N) and oxygen (O) comprises: heating a mixture comprising a group IIIB element-containing compound and a nitrogen-containing organic compound to form a pyrolysate; disintegrating the resulting pyrolysate-containing product; and firing the disintegrated product.

Abstract: A luminescent material is provided, which comprises a crystalline phase including Y, Si, O and N, and an activator comprising Tb and Ce.

Abstract: A compound for non-linear optics for use at 350 nm and below. The compound includes a material for non-linear optics comprising AxM(1-x)Al3B4O12. x is larger than or equal to zero and smaller than or equal to 0.1, A is selected from a group consisting of Sc, Y, La, Yb, and Lu, and M is selected from a group consisting of Sc, Y, La, Yb, and Lu. The compound is free from a molybdenum bearing impurity of at least 1000 parts per million.

Abstract: To provide a phosphor having nearly spherical shapes, the phosphor has an elemental ratio represented by the formula below, and contains at least two kinds of Li, Na, K, Rb, Cs, P, Cl, F, Br, I, Zn, Ga, Ge, In, Sn, Ag, Au, Pb, Cd, Bi and Ti. M1aM2bM3cOd (M1 represents Cr, Mn, Fe, Co, Ni, Cu, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm or Yb, M2 mainly represents a bivalent metal element, M3 mainly represents a trivalent metal element, and a, b, c and d are 0.0001?a?0.2, 0.8?b?1.2, 1.6?c?2.4 and 3.2?d?4.8, respectively.

Abstract: Disclosed herein are a metal hydroxy carbonate nanoparticle-coated phosphor and a preparation method thereof. The phosphor coated with metal hydroxy carbonate nanoparticles exhibit improved thermal stability and an increased luminance lifespan, when applied to display devices, e.g., PDPs and lamps.

Abstract: Methods for forming rare earth element doped oxide, oxyhalide and oxysulfide activated nanoparticles by the following method steps: (a) providing a precursor solution of a water- or alcohol-soluble host metal salt or host metalloid compound and one or more water- or alcohol-soluble rare earth element salts in a polar solution; (b) forming an aerosol of the precursor solution and oxygen; (c) feeding the aerosol to a heated Laval tube (d) igniting the aerosol with a reactive gas flame at the apex of the Laval tube to pyrolyze the salts; and (e) expanding and cooling the pyrolysis gases emerging from the Laval tube so that rare earth element doped nanoparticles precipitate therefrom; wherein one or more of the aerosol particle size, flow rate through the Laval tube and pyrolysis temperature are selected to provide a predetermined particle size and degree of crystallinity without particle aggregation.

Abstract: The invention relates to a luminescent material comprising a luminescent particle (20) for generating light (4), wherein the luminescent particle (20) has a structured particle surface for effectively outcoupling the light (4) generated within the luminescent particle (20). Furthermore, the invention relates to a light source comprising a luminescent material according to the invention and a device for exciting the luminescent material.

Abstract: The invention provides borate phosphors composed of Ma(Mb)1-xBO3:(Mc)x, wherein Ma is Li, Na, K, Rb, Cs, or combinations thereof, Mb is Mg, Ca, Sr, Ba, Zn or combinations thereof, Mc is Y, La, Pr, Nd, Eu, Gd, Tb, Ce, Dy, Yb, Er, Sc, Mn, Zn, Cu, Ni, Lu, or combinations thereof, and 0?x?0.3. The borate phosphors 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: Provided is a silicon-based blue phosphorescent material having a longer luminescence lifetime, a high luminescence intensity, and excellent long-term stability and reproducibility. A method for producing a silicon-based blue-green phosphorescent material controllable by an excitation wavelength, which comprises a first step of anodizing the surface of silicon to prepare a nanocrystal silicon or a nanostructure silicon, a second step of processing the nanocrystal silicon or the nanostructure silicon prepared in the first step for rapid thermal oxidation, and a third step of processing the nanocrystal silicon or nanostructure silicon having been processed for rapid thermal oxidation in the second step, for high-pressure water vapor annealing.

Abstract: The current invention provides a persistent phosphor blend, along with techniques for making and using the blend. The persistent phosphor blend is made of at least one persistent phosphor combined with at least one other phosphor, where the excitation spectra of the one or more other phosphors overlap the emission spectra of the one or more persistent phosphors. The choice of the phosphors used allows the decay time and emission colors to be tuned for the specific application. In another embodiment, the invention provides a method for making persistent phosphor blends with tunable colors. In yet another embodiment, applications for such a persistent phosphor blend are provided.

Abstract: A water-stable semiconductor nanocrystal complex that is stable and has high luminescent quantum yield. The water-stable semiconductor nanocrystal complex has a semiconductor nanocrystal core of a III-V semiconductor nanocrystal material and a water-stabilizing layer. A method of making a water-stable semiconductor nanocrystal complex is also provided.

Abstract: A method of forming nanometer sized fine particles of functional ceramic from a bulk functional ceramic, particularly fine particles of phosphorous ceramics from a bulk phosphor material is disclosed. The method relies on irradiation of a bulk phosphorous ceramic in a liquid with an ultrashort-pulsed-laser-fragmentation beam to thereby form nanometer sized particles of the phosphorous ceramic. The method is unique in that the generated particles retain the chemical and crystalline properties of the bulk phosphorous ceramic. The generated solutions are stable colloids from which the particles can be isolated or used as is.

Abstract: A thermally stable phosphor made of the M-Si—O—N system, having a cation M and an activator D, M being represented by Ba or Sr alone or as a mixture and optionally also being combined with at least one other element from the group Ca, Mg, Zn, Cu. The phosphor is activated with Eu or Ce or Tb alone or as a mixture, optionally in codoping with Mn or Yb. The activator D partially replaces the cation M. The phosphor is produced from the charge stoichiometry MO—SiO2—SiN4/3 with an increased oxygen content relative to the known phosphor MSi2O2N2:D, where MO is an oxidic compound.

Abstract: A phosphor having a high brightness after being exposed to plasma and a phosphor paste containing the phosphor. The phosphor comprises a fluorescent substance A1 containing a compound represented by the following formula (I) and at least one activator selected from the group consisting of Eu and Mn, and a fluorescent substance B1 containing an aluminate; mM1O.nM2O.2M3O2??(I) [in the formula (I), M1 is at least two selected from the group consisting of Ca, Sr and Ba, or Ca alone or Ba alone; M2 is at least one selected from the group consisting of Mg and Zn; M3 is at least one selected from the group consisting of Si and Ge; 0.5?m?3.5; and 0.5?n?2.5].

Abstract: One embodiment of the present invention provides (i) a luminant having a unique crystal structure so as to exhibit high luminosity and (ii) a manufacturing method thereof. Further, the present invention discloses (I) a luminant which exhibits ultraviolet luminescence and (II) a manufacturing method thereof. The inventors developed a stress-stimulated luminescent material which exhibits high luminosity by using a compound having a structure obtained by inserting alkali metal ions and alkali earth metal ions into a base material structure constituted of polyhedral-structure molecules and partially substituting the alkali metal ions and alkaline earth metal ions by rare earth metal ions, transition metal ions, group-III metal ions, or group-IV metal ions.

Abstract: A long-lived phosphor composition is provided, along with methods for making and using the composition. More specifically, in one embodiment, the phosphor comprises a material having a formula of Ax-y-zAl2-m-n-o-pO4:Euy, REz, Bm, Znn, Coo, Scp. In this formula, A may be Ba, Sr, Ca, or a combination of these metals, x is between about 0.75 and 1.3, y is between about 0.0005 and 0.1, z is between about 0.0005 and 0.1, m is between about 0.0005 and 0.30, n is between about 0.0005 and 0.10, o is between about 0 and 0.01 and p is between about 0 and 0.05. RE is Dy, Nd, or a combination thereof. In another embodiment, methods are provided for making persistent phosphors comprising the formulations above. Other embodiments provide applications for such a phosphor, comprising uses in toys, emergency equipment, clothing, and instrument panels, among others.

Abstract: Inorganic phosphor particles are provided, each of which containing: a matrix including at least one compound selected from the group consisting of II Group-XVI Group compounds, XII Group-XVI Group compounds, and mixed crystals thereof; and at least one metal element selected from the group consisting of metal elements belonging to Groups 6 to 11 in second transition series and third transition series of the periodic table, the metal element forming a luminescent center including wherein at least 30% of all the inorganic phosphor particles are particles each having at least 10 stacking fault planes at intervals of at most 5 nm.

Abstract: The present invention provides a new ultra-long after-glow phosphorescent material and manufacturing method for the same. The materials include a phosphor including aMS.bM3(PO4)2.cMSiO3.dMO.fAl2O3.xRO.yTR2O3.zMnO, where the M is Ca, Mg, Ba, Sr, Zn or combinations thereof; The R is Eu, Sm, Yb or combinations thereof; the TR is La, Pr, Y, Nd, Dy, Er, Tm, Ce, Ho or combinations thereof: and a, b, c, d, f, x, y, z is the number of mol. The phosphorescent material has superior water resistance and temperature resistance.

Abstract: A green phosphor including a compound represented by Formula 1 (Y3-xMx) (Al5-yM?y)O12:Cez and a pigment. The green phosphor having the compound represented by Formula 1 and a pigment has a shorter decay time than conventional phosphors, and thereby confers excellent luminescence characteristics and color purity. A display panel including the green phosphor 1 is also provided herein.

Abstract: The present invention provides a production process for the production of an MAl2O4:Eu type long-lasting phosphor (M representing an alkaline earth metal). The process includes the steps of mixing a BAM (alkaline earth aluminate) phosphor with an alkaline earth compound and calcinating the resulting mixture.

Abstract: This invention relates to a light emitting device based on a Xe or Xe/Ne excimer discharge, e.g. a full color display screen or a xenon excimer lamp, comprising a phosphor blend of a red-emitting Eu(III)-activated phosphor and an UVlight emitting phosphor. Full color plasma display panels (PDPs) according to the present invention comprising a phosphor blend of a red-emitting Eu(III)-activated phosphor and an UV-light emitting phosphor for the red pixels show an improved color point and a shorter decay time compared to the use of the respective single red emitting Eu(III) activated phosphor. Xenon excimer lamps for illumination purposes (e.g. for LCD backlighting or X-Ray image illumination) comprising a phosphor blend of a redemitting Eu(III) activated phosphor and an UV-light emitting phosphor show an improved color rendering. The invention is also related to a phosphor blend of a red-emitting Eu(III)-activated phosphor and an UV-light emitting phosphor.

Abstract: The invention provides a white light illumination device including an ultraviolet excitation light source and an ultraviolet excitable aluminosilicate phosphor. The ultraviolet excitable aluminosilicate phosphor has a formula as (M1-x,Rex)aAlbSicOd:D, wherein M is Mg, Ca, Sr, Ba or combination thereof. In addition, Re is Y, La, Pr, Nd, Eu, Gd, Tb, Ce, Dy, Yb, Er, Sc, Mn, Zn, Cu, Ni, Lu or combination thereof, while 0<a, b, c, d, 2a+3b+4c=2d, and 0?x?a. Furthermore, D is F, Cl, I, Br, OH, S or combinations thereof. The aluminosilicate phosphor emits blue or blue-green light under the excitation of ultraviolet light, and the aluminosilicate phosphor may further collocate with different color phosphors to provide a white light illumination device.

Abstract: To provide a phosphor having an emission spectrum with a broad peak in a range from green color to yellow color, having a broad and flat excitation band capable of using lights of broad range from near ultraviolet/ultraviolet to blue lights as excitation lights, and having excellent emission efficiency and luminance. The problem is solved by providing the phosphor expressed by a general composition formula 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 the activator.), satisfying 4.0<(a+b)/m<7.0, a/m?0.5, b/a>2.5, n>o, n=2/3m+a+4/3b?2/3o, and having an emission spectrum with a peak wavelength of 500 nm to 650 nm when excited by light in a wavelength range from 300 nm to 500 nm.

Abstract: A fluorescent powder using YAG (yttrium aluminum garnet) as the substrate and cerium as the excitant, and having added thereto Tb (terbium) ions, Ga (gallium) ions, Yb (ytterbium) ions and Lu (lutetium) ions. The YAG (yttrium aluminum garnet) has the chemical formula of (Y1-x-y-z-p-qGdxTbyYbzLupCeq)3Al5O12. The invention also provides an organic film layer using the fluorescent powder, and a LED using the organic film layer.

Abstract: Submicronic barium and magnesium aluminates, useful as phosphors, are in the form of a liquid-phase suspension of substantially monocrystalline particles having an average particle size ranging from 80 to 400 nm; such aluminates are prepared by a process that includes: providing a liquid mixture containing compounds of aluminum and of other elements that are part of the aluminate composition; drying the mixture by atomization; calcining the dried product in a reducing atmosphere and wet-grinding this product.

Abstract: Disclosed is a phosphor containing a nitrogen element, a compound having a garnet structure and an activator. The activator is composed of at least one element selected from the group consisting of Ce, Pr, Nd, Eu, Tb, Dy, Ho, Er, Tm, Yb and Mn.

Abstract: Provided is a nanocrystalline phosphor having a core/shell structure formed by a core of a group 13 nitride semiconductor and a shell layer, covering the core, including a shell film of a group 13 nitride mixed crystal semiconductor. This nanocrystalline phosphor has high luminous efficiency, and is excellent in reliability. Also provided is a coated nanocrystalline phosphor prepared by bonding modified organic molecules to the nanocrystalline phosphor and/or coating the nanocrystalline phosphor with the modified organic molecules. This coated nanocrystalline phosphor has high dispersibility. Further provided is a method of preparing a coated nanocrystalline phosphor by heating a mixed solution containing a core of a group 13 nitride semiconductor, a nitrogen-containing compound, a group 13 element-containing compound and modified organic molecules.

Abstract: The solid scintillator according to the present invention is expressed by the following formula (1): [Formula 1] (M1-x-yGdxCey)3J5O12??(1) (wherein M is at least one element of La and Tb; J is at least one metal selected from the group consisting of Al, Ga, and In; and x and y are such that 0.5?x?1 and 0.000001?y?0.2). The transmittance of light having a wavelength of 550 nm measured at a thickness of 2 mm is equal to or greater than 40%. The solid scintillator according to the present invention can be manufactured at low cost, has a high light emitting power, and does not release Cd because Cd is not contained.

Abstract: The invention relates to a phosphor in a polycrystalline ceramic structure and a light-emitting element provided with the same comprising a Light-Emitting Diode (LED) in which a composite structure of phosphor particles is embedded in a matrix, characterized in that the matrix is a ceramic composite structure comprising a polycrystalline ceramic alumina material, hereafter called luminescent ceramic matrix composite. This luminescent ceramic matrix composite can be made by the steps of converting a powder mixture of ceramic phosphor particles and alumina particles into a slurry, shaping the slurry into a compact, and applying a thermal treatment, optionally in combination with hot isostatic pressing into a polycrystalline phosphor-containing ceramic alumina composite structure.

Abstract: There is provided a group III nitride semiconductor epitaxial substrate which has a suppressed level of threading dislocation in the vertical direction and excellent crystal quality, the group III nitride semiconductor epitaxial substrate including a substrate (1) for growing an epitaxial film; and an ELO layer (4) having a composition of AlxGa1-xN (0?x?1) formed either on top of the substrate (1) or on top of a group III nitride layer (2) formed on top of the substrate (1), wherein the ELO layer (4) is a layer formed by using a mask pattern (3), which is composed of carbon and is formed either on top of the substrate (1) or on top of the group III nitride layer (2).