345 results about "Manganese doping" patented technology

A process for preparing color stable Mn+4 doped phosphors includes providing a phosphor of formula I;Ax[MFy]:Mn+4  Iand contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid;Ax[MFy];  IIwhereinA 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 [MFy] ion; andy 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 IAx[MFy]:Mn+4  (I)whereinA 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 [MFy] ion; andy 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 includesAx(M(1−m),Mnm)Fy  (I)contacting a first aqueous HF solution comprising (1−m) parts of a compound of formula HxMFy, and a second aqueous HF solution comprising m*n parts of a compound of formula Ax[MnFy], with a third aqueous HF solution comprising (1−n) parts of the compound of formula Ax[MnFy] and a compound of formula AaX, to yield a precipitate comprising the color stable Mn4+ doped complex fluoride phosphor;whereinA 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 [MFy] ion;y is 5, 6 or 7;0<m≦0.05;0.1≦n≦1.

A core-shell fluorescent material and a light source device using the same are disclosed. The core-shell fluorescent material includes a core and a shell for generating an emitting light with wavelength within 520 and 800 nm after absorbing an exciting light with wavelength within 370 and 500 nm. The core may include yellow, green or red fluorescent powder, and the shell includes manganese (IV)-doped fluoride compound. The light source device generally includes the core-shell fluorescent material, a radiation source, leads and a package. The leads provide current to the radiation source and cause the radiation source to emit radiation. The core-shell fluorescent material is coated on the package for receiving the radiation so as to generate a high quality emission served as the desired light source for the field of lighting and displaying.

The invention provides a prussian blue nano particle with high photo-thermal performance and of a manganese-doped hollow structure and a preparation method of the prussian blue nano particle, belongs to the field of nanometer material preparation and biomedicine and aims to solve the problems that existing the photo-thermal performance and biosecurity of an existing manganese-doped prussian blue nano particle are in need of improvement, the synthesis process is complex, and the cost is high. The preparation method includes the steps that surface protectant and potassium ferricyanide are added to an acid solution, manganese salt is added, and a heating reaction is conducted; 2, vacuum drying is conducted after washing is conducted; 3, the acid solution, the surface protectant and a manganese-doped solid prussian blue nano cubic sample are mixed, and the heating reaction is conducted after dispersing is conducted; washing is conducted, a blue porous Mn-HPB nano cubic material is obtained, and vacuum drying is completed. The prussian blue nano particle with high photo-thermal performance and of the manganese-doped hollow structure is simple in preparation process and high in controllability, the obtained nano material is uniform in particle diameter and good in dispersing property, and long-term and stable existence is achieved; excellent biosecurity is achieved; a higher photo-thermal effect and photo-thermal conversion efficiency are achieved, and the prussian blue nano particle and the preparation method are used for photo-thermal treatment of tumors.

The invention provides a method for preparing luminescent band gap tunable double-light emitting manganese-doping perovskite nano-crystal, and belongs to the technical field of material preparation. The method comprises: firstly mixing cesium carbonate, oleic acid, and octadecene, obtaining a cesium oleate precursor solution; mixing lead bromide, oleylamine, oleic acid and octadecene, obtaining alead bromide precursor solution; mixing lead chloride, manganese chloride, and octadecene, obtaining a first mixed solution; adding oleylamine, oleic acid, and tri-n-octylphosphine to the first mixedsolution, obtaining a second mixed solution; adding the cesium oleate precursor solution to the second mixed solution, to obtain Mn:CsPbCl3 nano-crystal solution; injecting the lead bromide precursorsolution to the Mn:CsPbCl3 nano-crystal solution, and stirring, preparing Mn:CsPbCl3-xBrx nano-crystals, wherein X is greater than 0 but less than 3. By adopting the method provided by the invention,the luminescent band gap of the manganese-doping perovskite nanocrystals and continuous tuning of the corresponding illuminating color are realized through anion exchange.

A method includes obtaining particles of a phosphor precursor of formula Ax[MFy]:Mn4+, reducing sizes of the particles of the phosphor precursor by wet milling the particles and annealing the particles that are wet milled by contacting the particles with a fluorine-containing oxidizing agent. Additionally, a manganese doped complex fluoride phosphor prepared by this method is provided. A lighting apparatus and backlight device that include manganese-doped phosphor prepared by this method also are provided.

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 relates to a method for the aqueous phase synthesis of a manganese-doped zinc selenide adjustable-colour fluorescent quantum dot. Firstly, MnSe / ZnSe crystal nucleus is generated; and then, a method of stabilizer coating and the epitaxial growth of a ZnSe shell is used, the separation of crystal nucleation and growth steps is controlled to regulate the shell framework growth mode andthe reaction time, and an MnSe:ZnSe quantum dot is synthesized in the aqueous phase, thus an Mn ion 4T1-6A1 fluorescence emission center is strengthened (Mn / Zn mutual-melting interface) to increase the quantum yield to 4.8%, and the fluorescence launch emission spectrum is controlled and adjusted to 602 nm from 572 nm by prolonging the epitaxial growth time of the ZnSe shell. The invention has simple preparation technology, requires simple production equipment and is 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.

A process for preparing a color stable Mn4+ doped complex fluoride phosphor of formula I includesAx(M(1−m), Mnm)Fy  (I)contacting a first aqueous HF solution comprising (1−m) parts of a compound of formula HxMFy, and a second aqueous HF solution comprising m*n parts of a compound of formula Ax[MnFy], with a third aqueous HF solution comprising (1−n) parts of the compound of formula Ax[MnFy] and a compound of formula AaX, to yield a precipitate comprising the color stable Mn4+ doped complex fluoride phosphor;whereinA 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 [MFy] ion;y is 5, 6 or 7;0<m≦0.05;0.1≦n≦1.

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.

The invention provides a preparation method and application of a fluorescent molecularly imprinted adsorption separation material. The method includes the steps of: 1. preparation of SiO2 nano particles; 2. synthesis of manganese doped zinc sulfide quantum dots; 3. preparation of double bond modified SiO2 nano particles; 4. preparation of double bond modified and manganese doped zinc sulfide quantum dots; and 5. preparation of the fluorescent molecularly imprinted adsorption separation material. The preparation method of the surface molecularly imprinted composite photocatalytic material provided by the invention belongs to the technical field of environmental material preparation. The fluorescent molecularly imprinted polymer combines the selectivity of molecularly imprinted polymers and the fluorescence properties of quantum dots, and can realize rapid detection of target molecules through change of the fluorescence intensity.

The invention discloses a manganese doped CsPbBr3 perovskite quantum dot and molecular sieve composite luminescent material as well as a preparation method and an application thereof, and belongs to the technical field of luminescent materials. The method comprises the following steps: (1) stirring, centrifugation, washing and drying are carried for molecular sieve and a cesium bromide solution in order to obtain Cs+ exchanged molecular sieve; (2) octadecene, oleic acid and oleylamine are used for lead bromide and manganous bromide in order to obtain a bromide solution; (3) under the condition of inert gas and stirring, in octadecene, the bromide solution and the Cs+ exchanged molecular sieve are reacted, and cooling, washing and drying are carried out in order obtain the manganese doped CsPbBr3 perovskite quantum dot and molecular sieve composite luminescent material. The composite luminescent material has multi-peak emission in blue light and green light zones, and luminescent peak positions and each luminescent peak intensity can be modulated according to proportion between manganese ions and lead ions; the composite luminescent material has good environmental stability, and can be applied to the field of white light LED.