Abstract: A nanocrystal particle including at least one semiconductor material and at least one halogen element, the nanocrystal particle including: a core comprising a first semiconductor nanocrystal; and a shell surrounding the core and comprising a crystalline or amorphous material, wherein the halogen element is present as being doped therein or as a metal halide.

Abstract: Embodiments of the invention relate to a composite film and a fabrication method thereof, a photoelectric element and a photoelectric apparatus. The fabrication method of the composite film includes: preparing a polyfluorene-based compound solution, wherein the polyfluorene-based compound solution includes polyfluorene or polyfluorene derivatives; preparing a quantum dot solution; mixing the polyfluorene-based compound solution and the quantum dot solution together to prepare a mixed solution; removing a solvent in the mixed solution to prepare the composite film.

Abstract: The present invention provides a method for producing a fluoride fluorescent material, the method comprising: contacting potassium ions with first complex ions comprising tetravalent manganese ions and second complex ions comprising at least one member selected from the group consisting of elements belonging to Groups 4 and 14 of the Periodic Table in a liquid medium comprising hydrogen fluoride to obtain a dispersion containing fluoride particles represented by the following formula (I): K2[M1?bMn4+bF6]??(I) wherein M is the at least one member selected from the group consisting of elements belonging to Groups 4 and 14 of the Periodic Table, and b satisfies the relationship: 0<b<0.2; adding a reducing agent to the dispersion; and contacting the fluoride particles in the dispersion to which the reducing agent is added with at least one of additional second complex ions and additional potassium ions in the presence of hydrogen fluoride to obtain a fluoride fluorescent material.

Abstract: A piezoelectric material contains a main component containing a perovskite-type metal oxide represented by general formula (1), a first sub-component containing Mn, and a second sub-component containing Bi or Bi and Li. A Mn content relative to 100 parts by weight of the metal oxide is 0.500 parts by weight or less (including 0 parts by weight) in terms of metal, a Bi content relative to 100 parts by weight of the metal oxide is 0.042 parts by weight or more and 0.850 parts by weight or less in terms of metal, and a Li content relative to 100 parts by weight of the metal oxide is 0.028 parts by weight or less (including 0 parts by weight) in terms of metal: (Ba1?x?yCaxSny)?(Ti1?zZrz)O3 (where 0.020?x?0.200, 0.020?y?0.200, 0?z?0.085, 0.986???1.100)??General formula (1).

Abstract: The present invention aims to provide an excellent piezoelectric composition and an excellent piezoelectric element if the piezoelectric properties especially a high spontaneous polarization and a sufficiently high resistivity, the low pollution, the environment and the ecology are considered. In the piezoelectric composition, the main component contains the substance represented by the following formula with a perovskite-typed structure, (Bi(0.5x+y+z)Na0.5x)m(Tix+0.5yMg0.5yAlz)O3. Wherein, 0.01?x?0.8, 0.2?y?0.8, 0.01?z?0.6, 0.75?m?1.0, and x+y+z=1.

Abstract: A lead-free piezoelectric ceramic material has the general chemical formula xBiCoO3-y(Bi0.5Na0.5)TiO3-z(Bi0.5K0.5)TiO3, xBiCoO3-y(Bi0.5Na0.5)TiO3-zNaN-bO3, xBiCoO3-y(Bi0.5Na0.5)TiO3-zKNbO3, xBiCoO3-yBi(Mg0.5Ti0.5)O3-z(Bi0.5Na0.5)TiO3, xBiCoO3-yBa-TiO3-z(Bi0.5Na0.5)TiO3, or xBiCoO3-yNaNbO3-zKNbO3; wherein x+y+z=1, and x, y, z?0.

Abstract: According to one embodiment, a multi-layer magnetic nanoparticle includes a core; a first magnetic layer deposited on a surface of the core; and a second magnetic layer deposited on a surface of the first magnetic layer, where the core, the first magnetic layer and the second magnetic layer comprise different magnetic anisotropies and/or saturation magnetizations.

Abstract: Provided is a lead-free piezoelectric material having satisfactory piezoelectric constant and mechanical quality factor in a device driving temperature range (?30° C. to 50° C.) The piezoelectric material includes a main component containing a perovskite-type metal oxide represented by Formula 1, a first auxiliary component composed of Mn, and a second auxiliary component composed of Bi or Bi and Li. The content of Mn is 0.040 parts by weight or more and 0.500 parts by weight or less based on 100 parts by weight of the metal oxide on a metal basis. The content of Bi is 0.042 parts by weight or more and 0.850 parts by weight or less and the content of Li is 0.028 parts by weight or less (including 0 parts by weight) based on 100 parts by weight of the metal oxide on a metal basis. (Ba1-xCax)a(Ti1-yZry)O3 . . . (1), wherein, 0.030?x<0.090, 0.030?y?0.080, and 0.9860?a?1.0200.

Abstract: Provided is a lead-free piezoelectric material having satisfactory and stable piezoelectric constant and mechanical quality factor in a wide practical use temperature range. The piezoelectric material includes a perovskite-type metal oxide represented by Formula (1): (Ba1?xCax)a(Ti1?yZry)O3 (wherein, 1.00?a?1.01, 0.125?x?0.300, and 0.041?y?0.074), Mn, and Mg. The content of Mn is 0.12 parts by weight or more and 0.40 parts by weight or less based on 100 parts by weight of the perovskite-type metal oxide on a metal basis. The content of Mg is 0.10 parts by weight or less (excluding 0 part by weight) based on 100 parts by weight of the perovskite-type metal oxide on a metal basis.

Abstract: A method for producing a fluoride fluorescent material includes: subjecting a mixture that contains a fluoride compound in a liquid medium to a pressurization treatment and a heating treatment, the fluoride compound having a chemical composition represented by the following formula: A2[M1?aMn4+aF6]. A is at least one cation selected from the group consisting of K+, Li+, Na+, Rb+, Cs+and NH4+, M is at least one element selected from the group consisting of Group 4 elements and Group 14 elements, and a is a number that satisfies 0 <a <0.2. The pressurization treatment is performed at a pressure of 1.5 MPa or higher.

Abstract: Provided is magnetic powder capable of enhancing simultaneously both magnetic characteristics including SNP and durability of a magnetic recording medium. The hexagonal ferrite magnetic powder for a magnetic recording medium has a Ba/Fe molar ratio of 8.0% or more, a Bi/Fe molar ratio of 2.5% or more and an Al/Fe molar ratio of from 3.0 to 6.0%. The magnetic powder preferably has an activation volume Vact of from 1,400 to 1,800 nm3. The magnetic powder particularly preferably has a coercive force Hc of from 159 to 279 kA/m (which is approximately from 2,000 to 3,500 Oe) and a coercivity distribution SFD of from 0.3 to 1.0. The magnetic powder may contain, as an element that substitutes an Fe site of the hexagonal ferrite, at least one kind selected from divalent transition metals M1 and tetravalent transition metals M2.

Abstract: The present invention provides a lead-free piezoelectric material having a high piezoelectric constant and a high mechanical quality factor in a wide operating temperature range. The piezoelectric material includes a perovskite-type metal oxide represented by Formula (1): (Ba1-xCax)a(Ti1-yZry)O3 (1.00?a?1.01, 0.125?x<0.155, and 0.041?y?0.074) as a main component. The metal oxide contains Mn in a content of 0.12 parts by weight or more and 0.40 parts by weight or less based on 100 parts by weight of the metal oxide on a metal basis.

Abstract: A fluorescent substance is provided having excellent temperature properties and capable of being excited by light in the region from near ultraviolet to short-wavelength visible light to emit light of yellow to red color. A process for producing the fluorescent substance, and a light emitting device using the fluorescent substance is also provided. The fluorescent substance includes M which is at least one group II element selected from Ca, Sr, and Ba, and Al, Si, O, and N, and activated with Eu. The fluorescent substance has an X-ray diffraction pattern using CuK? radiation, in which the intensity of the diffraction peak in the Bragg angle range of 17.9° to 18.5° is taken as 100%, the relative intensity of the diffraction peak is 150% to 310% in a Bragg angle range of 24.5° to 25.1° , and is 320% to 550% in a Bragg angle range of 34.8° to 35.4°.

Abstract: A process for synthesizing a color stable Mn4+ doped phosphor includes contacting a precursor of formula I, in gaseous form at an elevated temperature with a fluorine-containing oxidizing agent to form the color stable Mn4+ doped phosphor Ax[MFy]:Mn4+??I wherein A is Li, Na, K, Rb, Cs, NR4 or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; R is H, lower alkyl, or a combination thereof; x is the absolute value of the charge of the [MFy] ion; and y is 5, 6 or 7.

Abstract: Provided are an yttrium aluminum garnet (YAG) phosphor, YAG phosphor particles, and methods of fabricating the same. The method of fabricating an yttrium aluminum garnet (YAG) phosphor involves: dispersing aluminum hydroxide core particles in an aqueous solution comprising yttrium, urea, and a lanthanide element to form a shell on the aluminum hydroxide core particles; and calcining the aluminum hydroxide core particles with the shell formed thereon to obtain hollow YAG particles, in which the shell includes a compound of yttrium and a lanthanide element.

Abstract: An afterglow property of cesium iodide:thallium (CsI:Tl), in which CsI is a host material and doped with thallium, is improved. It is possible to improve the afterglow property of a scintillator by doping a crystal material including CsI (cesium iodide), as a host material, and thallium (Tl), as a luminescent center, with bismuth (Bi).

Abstract: The present invention provides a method for producing a fluoride fluorescent material, comprising: contacting a fluoride particles represented by the following general formula (I): K2[M1-aMn4+aF6]??(I) wherein M is at least one member selected from the group consisting of elements belonging to Groups 4 and 14 of the Periodic Table, and a satisfies the relationship: 0<a<0.2; with a solution containing alkaline earth metal ions in the presence of a reducing agent to form an alkaline earth metal fluoride on the surface of the fluoride particles.

Abstract: There is provided a piezoelectric ceramics, including a perovskite compound of a non-stoichiometric composition represented by a composition formula (KxNa1-x)y(Nb1-zTaz)O3 (0<x?1, 0<y<1, 0?z?0.5); and a sintering aid which includes an oxide containing K, Co, and Ta.

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: A method for treating a Mn-activated complex fluoride phosphor is provided wherein a preliminarily-prepared red phosphor of a Mn-activated complex fluoride represented by the following formula (1): A2MF6:Mn??(1) wherein M represents at least one tetravalent element selected from Si, Ti, Zr, Hf, Ge and Sn, A represents at least one alkali metal selected from Li, Na, K, Rb and Cs provided that at least Na and/or K is contained, is heated in a substantially oxygen atom-free gas but containing a fluorine atom at a temperature of at least 50° C.