344 results about "Manganese doping" patented technology

A process for preparing color stable Mn⁺⁴ doped phosphors includes providing a phosphor of formula I;

A_x[MF_y]:Mn⁺⁴  I

and contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid;

A_x[MF_y];  II

• • wherein
  • A is Li, Na, K, Rb, Cs, NR₄ or a combination thereof;
  • M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, 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 [MF_y] ion; and
  • y is 5, 6 or 7.

In particular embodiments, M is Si, Ge, Sn, Ti, Zr, or a combination thereof.

A lighting apparatus capable of emitting white light includes a semiconductor light source; and a phosphor composition radiationally coupled to the light source, and which includes a color stable Mn⁺⁴ doped phosphor.

Low-HF or HF-free processes for improving color stability of a Mn⁺⁴ doped phosphor of formula I include contacting the phosphor of formula I with a solution that contains hexafluorosilicic acid, and isolating a treated phosphor of formula I having improved color stability relative to an untreated phosphor of formula I

A_x[MF_y]:Mn⁺⁴  (I)

• • wherein
  • A is Li, Na, K, Rb, Cs, R₄ or a combination thereof;
  • M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, 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 [MF_y] ion; and
  • y is 5, 6 or 7.

The present relates in general to upconversion luminescence (“UCL”) materials and methods of making and using same and more particularly, but not meant to be limiting, to Mn²⁺ doped semiconductor nanoparticles for use as UCL materials. The present invention also relates in general to upconversion luminescence including two-photon absorption upconversion, and potential applications using UCL materials, including light emitting diodes, upconversion lasers, infrared detectors, chemical sensors, temperature sensors and biological labels, all of which incorporate a UCL material.

The invention discloses a preparation method of an alkali oxygen evolution reaction electrocatalyst. The preparation method comprises the following steps: firstly, carrying out ultrasonic cleaning on a conductive substrate, then preparing aqueous solution with soluble cobalt salt, soluble manganese salt, ammonium fluoride and urea, and in a reaction kettle, vertically growing a manganese cobalt subcarbonate nano array multilevel structure on the surface of the substrate; then preparing aqueous solution with soluble alkali and a reducing agent, carrying out secondary treatment, and carrying out structure and performance optimization on the manganese cobalt subcarbonate nano array multilevel structure; finally, in a tube furnace, in nitrogen or argon atmosphere, carrying out calcination at a temperature of 200 to 1,000 DEG C to prepare the alkali oxygen evolution reaction electrocatalyst with a manganese-doped cobalt oxide nano array multilevel structure. The preparation method disclosed by the invention adopts a simple hydro-thermal synthesis/calcination treatment method, is simple in process and is easy to regulate and control; the prepared product is excellent in performance and is an electrocatalyst with wide prospect in the application process of alkali water decomposition.

The present invention is directed to a dielectric thin film composition comprising: (1) one or more barium/titanium-containing selected from (a) barium titanate, (b) any composition that can form barium titanate during firing, and (c) mixtures thereof; dissolved in (2) organic medium; and wherein said thin film composition is doped with 0.002 to 0.05 atom percent of a manganese-containing additive.

A process for preparing a color stable Mn⁴⁺ doped complex fluoride phosphor of formula I includes

A_x(M_(1−m),Mn_m)F_y  (I)

contacting a first aqueous HF solution comprising (1−m) parts of a compound of formula H_xMF_y, and a second aqueous HF solution comprising m*n parts of a compound of formula A_x[MnF_y], with a third aqueous HF solution comprising (1−n) parts of the compound of formula A_x[MnF_y] and a compound of formula A_aX, to yield a precipitate comprising the color stable Mn⁴⁺ doped complex fluoride phosphor;

• • 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 an anion;
    • a is the absolute value of the charge of the X anion;
    • x is the absolute value of the charge of the [MF_y] ion;
    • y is 5, 6 or 7;
    • 0<m≦0.05;
    • 0.1≦n≦1.

The invention relates to a preparation method of a manganese-doped two-dimensional lead halide perovskite material with the high photoluminescence quantum yield. The preparation method mainly comprises the following steps that (1) haloid acid is added into organic amine according to a 1:1 molar ratio, and ice-bath stirring is conducted for 15 minutes; (2) the solution is placed in a 80 DEG C drying oven overnight, till crystals are completely dissolved out; (3) the crystals are placed into the 80 DEG C drying oven to be dried after being washed clearly with absolute ethyl alcohol; and (4) organic halate, lead halide and manganese halide with certain proportion are added into a mortar and uniformly ground, and an end product is obtained. The general formula of the prepared manganese-doped lead halide perovskite meets (C<n>H<2n+1>NH3)2Pb<1-x>Mn<x>X4, wherein the value of x is between 0.001 and 0.95, the lead halide perovskite material has an excellent optical property, the luminescence center wavelength is between 595 and 630 nm, and the quantum yield emitted by Mn<2+> reaches 90%. By adjusting the chain length and the structure of organic amine salt and sorts of halide ions, controlling of the wavelength emitted by Mn<2+> is achieved, and the preparation method of manganese-doped two-dimensional lead halide perovskite is simple and rapid.

The invention discloses a manganese-doped niobium nickel-lead zirconate titanate piezoelectric ceramic material and a preparation method thereof. The composition of the piezoelectric ceramic material is Pb[(Ni1/3Nb2/3)x(ZryTi1-y)1-x]O3+zM, wherein in the formula, x, y and z represent the molar content; M is manganese or oxide of manganese; and x is more than 0.0 and less than 0.9, y is more than 0.0 and less than 0.8, and z is more than 0.0 and less than 0.3. The novel piezoelectric ceramic material with excellent comprehensive performance is obtained by preserving heat and sintering for 0.5 to 10h at the temperature of 1,000 to 1,300 DEG C by the traditional solid-phase sintering process; and the piezoelectric ceramic material has a relatively high mechanical quality factor (Qm-670), a good ferroelectric property (Ec-4.3kV/cm) and a good piezoelectric property (d33-495pC/N). The novel piezoelectric ceramic material is mainly applied to devices such as micro-actuators, piezoelectric transducers, surface wave filters and piezoelectric sensors.

The invention relates to a method for preparing CeO2 nanopowder from cerium manganese carbide. A 25 kg vacuum induction furnace is used to melt 45.5-91% metal cerium, 3-45.5% electrolytic manganese and 6-9% graphite (mass percentage), and select graphite crucible , after melting and casting to obtain cerium-manganese carbide alloy, prepare cerium-manganese carbide alloy powder with a particle size of less than 0.15mm and deionized water at a mass ratio of 1:10 to 1:40, and stir at a constant temperature of 10 to 50°C for 18 to 36 hours reacting, washing and drying to obtain composite cerium-manganese nanopowder with a specific surface area of ​​118-142m2/g. The composite cerium-manganese nanopowder is heat-treated at 600-800°C/2h to obtain the nanopowder whose main phase is CeO2, and the manganese-doped CeO2nanopowder has good thermal stability. The method is simple to operate, environmentally friendly and easy to realize industrial production.

The invention discloses a composite photocatalytic antibacterial material and a preparation method thereof; particularly, a ytterbium-erbium co-doped sodium yttrium fluoride (NaYF4:Yb,Er) and manganese-doped zinc oxide are combined to prepare the photocatalytic antibacterial material driven by visible/near-infrared light. The preparation method comprises the steps: together dissolving sodium chloride, yttrium acetate, ytterbium acetate, erbium acetate and ammonium fluoride in an ethylene glycol/water mixed solvent, and carrying out a microwave assisted solvothermal reaction to obtain NaYF4:Yb,Er spherical nanoparticles; dispersing the NaYF4:Yb,Er in an isopropanol/water/ammonia water mixed solvent, adding tetraethyl orthosilicate, and carrying out hydrolysis for 5 h, to obtain an NaYF4:Yb,Er@SiO2 core-shell structure; and carrying out ultrasonic dispersion of the NaYF4:Yb,Er@SiO2 in diethylene glycol, adding a zinc salt and a manganese salt, carrying out a heating reflux reaction at the temperature of 180 DEG C for 1-6 h, then washing, drying, and calcining for 2 h at the temperature of 500 DEG C to obtain the product. The material can convert the visible/near-infrared light into UV/visible light, manganese-doped zinc oxide absorbs the UV/visible light to produce electrons-holes, and the electrons-holes act on the environment to produce free radicals to participate in a sterilization process, and the material can be used in the field of photodynamic therapy.

The invention provides a method for improving luminous thermal stability of manganese-doped perovskite quantum dots, belonging to the technical field of material preparation. The method comprises thefollowing steps: preparing a Mn:CsPbCl3 quantum dot solution; mixing the Mn:CsPbCl3 quantum dot solution and a PDMS solution to obtain a mixed solution III; dispensing the mixed solution III onto a silicon substrate to form a film, placing the film in a vacuum unit to perform continuous changed temperature heat treatment and conventional annealing heat treatment so as to obtain samples subjected to heat treatment, and performing luminous thermal stability test on the samples subjected to heat treatment; or, dispensing the obtained mixed solution III and Cu:ZnInS/ZnS quantum dots on a blue LEDchip, preparing a white LED device, drying, and performing luminous thermal stability test on the device. With the adoption of PDMS coating, luminescence quenching brought by ligand drop and size growth can be obviously reduced, and the luminous thermal stability of the quantum dots is improved.

The invention discloses bivalent manganese-doped full inorganic perovskite quantum dot glass. The bivalent manganese-doped full inorganic perovskite quantum dot glass is prepared from 25 to 45 percentof B2O3, 25 to 45 percent of SiO2, 1 to 10 percent of MCO3, 1 to 10 percent of Al2O3, 1 to 5 percent of ZnO, 1 to 10 percent of Cs2CO3, 1 to 10 percent of PbCl2, 1 to 10 percent of NaCl and 1 to 10 percent of MnCl2, wherein M is Ca, Sr or Ba. The preparation method of the quantum dot glass comprises the following steps: grinding all raw material components of the glass and melting after uniform mixing; then carrying out compression molding on a melt, annealing and carrying out heat treatment, thus obtaining the bivalent manganese-doped full inorganic perovskite quantum dot glass by carrying out heat treatment with different temperatures. The quantum dot-doped glass prepared by the invention has the advantages of good chemical stability and higher fluorescence quantum efficiency, and is aluminescent material with a promising application prospect.

The invention discloses a manganese-doped titanate-based red luminescent material and a preparation method and an application thereof. The red luminescent material has the chemical general formula of BaAl6TiO12:xMn<4+>, wherein x is the Mn<4+> doped molar percentage coefficient, and 0.001<=x<=0.25; the red luminescent material can be prepared by using a high temperature solid phase method or a sol-gel method, moreover, has good chemical stability, can emit red rays with the wavelength range of 620-750 nm when excited by ultraviolet, near ultraviolet, blue rays or other excitation light sources, has broader excitation spectral range, has strong absorption at the wavelength of 355 nm, and is perfectly matched with commercial blue chips.

The invention belongs to the technical field of luminous materials, and discloses a manganese doping perovskite quantum dot and molecular sieve composite luminous material, and a preparation method and application thereof. The method comprises the following steps of (1) stirring molecular sieves and a caesium halide solution; performing centrifugation, washing and drying to obtain Cs<+> exchanged molecular sieves; (2) making lead halide into a lead halide solution by octadecylene, oleic acid and oleyl amine; (3) making manganese halide into a manganese halide solution by octadecylene, oleic acid and oleyl amine; (4) under the insert gas and stirring conditions, in the octadecylene, performing reaction on the lead halide solution, the manganese halide solution and the Cs<+> exchanged molecular sieves; performing cooling, washing and drying to obtain the composite luminous material. The composite luminous material realizes the royal purple and red double-peak emission; the luminous peak position can be modulated according to the proportion of manganese ions and lead ions and two different halogens. The material provided by the invention has better environment stability, and can be used in the field of white light LEDs (light emitting diodes).

The invention relates to a preparation method of a manganese-doped fluoride luminescent material controllable in morphology and particle size, and belongs to the field of preparation of LED luminescent materials. The method is mainly characterized in that the manganese-doped fluoride luminescent material Ax(M1-zNw)Fy:Mn4+ uniform in morphology and controllable in particle size can be prepared through two-step synthesis. The two-step synthesis is characterized in that firstly, a liquid phase synthesis mode is adopted to prepare a manganese-doped fluoride luminescent material raw crystal with the particle size smaller than 10 micrometers; secondly, the raw crystal is put into the reaction solution in the first step, the saturability and the proportion are controlled to control the growth amount of a secondary crystal, and the sphere-like product controllable in particle size and uniform in morphology is obtained. By carrying out surface treatment on the manganese-doped fluoride luminescent material with organosilicone, the stability performance of the manganese-doped fluoride luminescent material in a high-temperature and high-humidity environment is improved.

The invention discloses a manganese-doped Cs3Cu2I5 halide scintillator with high light yield. The manganese-doped Cs3Cu2I5 halide scintillator comprises the following steps: fully grinding CsI, CuI and a divalent manganese compound; calcining an obtained mixture; and after the reaction is finished, naturally cooling to room temperature, grinding, and carrying out vacuum drying to obtain the Cs3Cu2I5: Mn < 2 + > halide scintillator. The copper-based halide Cs3Cu2I5: Mn < 2 + > prepared by the method is non-toxic and easy to prepare, has high radiation absorption coefficient, long-wavelength visible light luminescence, high light yield and high stability under continuous X-ray irradiation, and can be applied to X-ray medical imaging equipment, nuclear batteries and the like.

The invention discloses a manganese-doped two-dimensional organic-inorganic hybrid perovskite fluorescent material as well as a preparation method and an application thereof and belongs to the field of a luminescent material. The method comprises the following steps of (1) preparing a crystalline material (C7H6N2)2PbBr4 by a solution method; (2) mixing MnBr2 and the crystalline material (C7H6N2)2PbBr4 according to a certain molar ratio, and grinding the mixture; and (3) heating the obtained mixture to obtain the manganese-doped two-dimensional organic-inorganic hybrid perovskite fluorescent material. By using the method disclosed by the invention, the optical property of the perovskite crystalline material can be adjusted and controlled, the red shift phenomenon occurs in a fluorescent emission wavelength after Mn is doped, meanwhile the fluorescence intensity is increased, and the material exhibits excellent application prospects in the development and research of an LED (Light Emitting Diode) luminescent device.

The invention provides a metalmanganese doped carbon quantum dot having high fluorescence quantum yield and a preparation method and application thereof. The preparation method comprises the following steps that (1), a carbon source and a manganese source are dissolved in water to obtain a precursor solution; (2), the precursor solution reacts in a hydrothermal reaction kettle and then is cooled to reach room temperature to obtain a suspension; (3), the suspension is separated to obtain a solution; and (4), the solution is dialyzed and dried to obtain the metalmanganese doped carbon quantum dot. The metalmanganese doped carbon quantum dot can be prepared only through one-step reaction, the cost is low, the reaction speed is high, and few by-products and intermediate products are produced. In addition, the obtained carbon quantum dot has the advantage of high fluorescence quantum yield, meanwhile can be applied to detection of a trace amount of Hg<2+> in domestic drinking water and also has a wide application prospect in the aspects of biological detection, sewage treatment and the like.