168 results about "YTTRIUM FLUORIDE" patented technology

An electrically conductive, plasma-resistant member adapted for exposure to a halogen-based gas plasma atmosphere includes a substrate having formed on at least part of a region thereof to be exposed to the plasma a thermal spray coating composed of yttrium metal or yttrium metal in admixture with yttrium oxide and/or yttrium fluoride so as to confer electrical conductivity. Because the member is conductive and has an improved erosion resistance to halogen-based corrosive gases or plasmas thereof, particle contamination due to plasma etching when used in semiconductor manufacturing equipment or flat panel display manufacturing equipment can be suppressed.

Embodiments relate to a coated substrate and a method of making and using the same. A plasma-spray coated layer may be formed on a substrate, wherein the plasma-sprayed coated layer comprises a rare-earth oxide (e.g., yttrium oxide), a rare-earth fluoride (e.g. yttrium fluoride), or a rare-earth silicate (e.g. yttrium silicate). An exposed surface of the plasma-spray coated layer may be irradiated to form a treated portion of the layer, wherein the treated portion of the layer has a mean spacing of local peaks (S value) between about 100 and 200 microns. A second layer may be formed on the treated portion of the plasma-spray coated layer, wherein the second layer comprises a dielectric material.

The invention provides a graphene and rare earth up-conversion fluorescent composite material and a preparation method thereof. The method comprises the steps of: using a graphite powder as a raw material to prepare graphite oxide by a Hummer method; conducting ultrasonic dispersion on 5-85mg of graphite oxide into 24-60mL of water; then adding Y (NO3), Yb (NO3) and Er (NO3) in a total molar weight of 0.05-1mmol by a stoichiometric ration of 78:20:2 into the graphite oxide dispersion; adding 0.02-0.5g of NaF and stirring for 5-10min; transferring the mixture to a 100mL reactor; reacting for 4-24h at 200-240 DEG C; naturally cooling to room temperature; centrifuging for separation and washing the reaction product with deionized water twice to obtain a graphene and yttrium fluoride up-conversion fluorescent powder composite material, which comprises a mixture of two or three selected from the followings: graphene-YF3:Yb, Er; graphene-(alpha) NaYF4:Yb, Er; and graphene-(beta) NaYF4:Yb, Er. The method provided by the invention is simple, employs non-toxic raw materials, and can change type of the earth up-conversion fluorescent material and up-conversion fluorescence properties of a final composite material by simply adjusting conditions of a hydrothermal reaction.

The invention discloses an upconversion fluorescent ink for an inkjet printer. The upconversion fluorescent ink comprises, by weight, 1-10 parts of rare-earth doped upconversion fluorescent nanoparticles, 1600-2000 parts of ink solvent and 300-800 parts of thickener, the rare-earth doped upconversion fluorescent nanoparticles are sodium yttrium fluoride nanoparticles co-doped by rare-earth activator and rare-earth sensitizer, the rare-earth activator is erbium, thulium or holmium, and the rare-earth sensitizer is ytterbium or erbium. The upconversion fluorescent ink for the inkjet printer has the advantages of good anti-counterfeiting effect and long fixation time and storage life and can realize individualized instant anti-counterfeiting printing.

The invention relates to a rare earth doped lithium yttrium fluoride nanometer material and a preparation method and application thereof. A modified high-temperature coprecipitation method is adopted to synthesize the rare earth doped lithium yttrium fluoride nanometer material with upper conversion/lower transfer luminescence, at the same time, epitaxial growth is conducted on the basis of a core, a mono-layer core-shell structure nanometer material which is uniformly covered can be obtained, and a lithium yttrium fluoride based multi-layer core-shell nanometer material is further prepared. The three prepared and obtained materials are good in monodispersity, uniform in particle size and excellent in luminescent property, after acid pickling treatment, water-soluble nanometer particles can be used for biological detection and biological imaging.

The invention discloses a radiation refrigeration optical filter which comprises a substrate. A single surface of the substrate is polished, a metal reflecting layer is arranged on a rough surface ofthe substrate, and an intermediate layer and a top layer are sequentially arranged on the polished surface of the substrate; the intermediate layer comprises layers A and layers B which are alternately arranged; the thicknesses of each layer A and each layer B are 50-400 nm; the layers A are made of silicon dioxide or aluminum oxide, and the layers B are made of titanium dioxide or silicon nitrideor silicon carbide; alternatively, the layers A are made of titanium dioxide or aluminum oxide, and the layers B are made of silicon dioxide or silicon nitride or silicon carbide; the top layer is made of ytterbium fluoride or yttrium fluoride or zinc sulfide; multi-resonant absorption enhancers in wavebands of atmospheric transparent windows (with the wavebands of 8-13 micrometers) are jointly formed by the intermediate layer and the top layer. Compared with the traditional optical filters, the radiation refrigeration optical filter has the advantages that the radiation refrigeration opticalfilter can work in intense light for a long time, and radiation refrigeration can be passively implemented by the radiation refrigeration optical filter.

The invention provides an optical bistable Tm, Ho:YLF laser, the width of pumping bistable area of a laser diode end surface of which can be adjusted; the optical bistable Tm, Ho:YLF laser comprises a laser diode pumping source, an optical fiber, a coupling lens, a resonant cavity and a thulium and holmium codoping lithium yttrium fluoride crystal; the optical bistable Tm, Ho:YLF laser is characterized in that: pumping light given off by the two laser diode pumping sources enters in the resonant cavity by respectively passing through the optical fiber and the coupling lens; the resonant cavity is an L-shaped right-angle folding cavity which is composed of a back-cavity mirror, a 45 degrees plane folding mirror and an output mirror; the front end of the resonant cavity is the back-cavity mirror, the rear end thereof is the 45 degrees plane folding mirror, and the lower end thereof is the output mirror; the thulium and holmium codoping lithium yttrium fluoride crystal is arranged in the resonant cavity. The laser has small volume, simple structure and low cost; by injecting pumping light to an absorption area, the absorption performance of the absorption area is changed, thus achieving the purpose of adjusting the width of the bistable area and leading the laser to have large adjusting magnitude and convenient usage.

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.

An yttrium fluoride spray material contains Y₅O₄F₇ and YF₃, and has an average particle size of 10-60 μm and a bulk density of 1.2-2.5 g/cm³. The Y₅O₄F₇ and YF₃ in the yttrium fluoride spray material consist of 30 to 90% by weight of Y₅O₄F₇ and the balance of YF₃. A sprayed coating of yttrium oxyfluoride is obtained by atmospheric plasma spraying of the spray material.

The invention discloses an efficient refining agent for smelting an aluminum alloy. The efficient refining agent is prepared from the following raw materials in parts by weight: 6-8 parts of plant ash, 8-10 parts of bentonite, 3-5 parts of wollastonite in powder, 3.5-5.5 parts of celestite powder, 0.5-2 parts of graphite powder, 3-5 parts of jade powder, 2-4 parts of quartz sand, 8-10 parts of magnesium hydroxide, 8-10 parts of lithium chloride, 6-8 parts of zinc chloride, 3-4 parts of calcium chloride, 2-4 parts of barium chloride, 4-5 parts of potassium fluosilicate, 1-2 parts of potassium tripolyphosphate, 2-3 parts of sodium sulfate, 1-2 parts of sodium metasilicate, 7-8 parts of rare earth carbonate, 0.1-1.0 part of boron oxide, 0.8-1.2 parts of yttrium fluoride and 3-5 parts of cerium oxide. The efficient refining agent can be used for effectively removing nonmetallic inclusions from an aluminum alloy melt and reducing the loss of rare earth elements in the alloy, and has a good degassing effect; and when the efficient refining agent is used for refining, aluminum dross is separated thoroughly, so that the porosity and oxide inclusions in an alloy casting are obviously reduced, and the comprehensive performance of an aluminum alloy profile is improved.

The invention relates to a method for preparing europium-doped yttrium fluoride nano fiber/polymer composite nano fiber, belonging to the technical field of nano material preparation. In the prior art, rare earth fluoride nano fiber and nanoribbon, rare earth fluoride nano particle/polymer composite nano fiber are prepared. The method comprises the following three steps of: (1) preparing Y2O3:5%Eu<3+> nano fiber: preparing PVP/[Y(NO3)3+Eu(NO3)3] composite nano fiber by using the electrostatic spinning technology, and carrying out thermal treatment to obtain the Y2O3:5%Eu<3+> nano fiber; (2) preparing YF3:5%Eu<3+> nano fiber: fluoridizing the Y2O3:5%Eu<3+> nano fiber by using the double crucible method to obtain the YF3:5%Eu<3+> nano fiber; and (3) preparing YF3:5%Eu<3+> nano fiber/PVP composite nano fiber: mixing the YF3:5%Eu<3+> nano fiber with PVP and DMF to obtain a spinning solution, and preparing the YF3:5%Eu3<3+> nano fiber/PVP composite nano fiber by using the electrostatic spinning technology. The diameter of the YF3:5%Eu<3+>nano fiber/PVP composite nano fiber is 276-362 nm, and the length is greater than 1 mm. The method is simple and feasible and has broad application prospect.

The invention relates to a visible near-infrared spectrum band reflection and infrared multispectral band transmission color separation filter and a preparation method, and belongs to the field of surface technology. The color separation filter comprises a zinc selenide base and a film system on one side of the base; the structure of the film system is (0.3h 0.6l0.3 h) ^ 10 (0.38h 0.76 l0.38 h) ^ 10 (0.5 h l0.5 h) ^ 12, and the central wavelength is 890 nm, wherein h and l refer to zinc sulfide and yttrium fluoride film respectively; and the color separation filter is prepared through the following steps: heating the base in vacuum, using ion beam to bombard the base, using ion beam to assist electronic gun evaporation to deposit the film system on two sides of the base, and cooling. The reflectivity of the color separation filter is high at 0.43-0.90 micron; the transmittance of the color separation filter is high at 1.55-1.75 microns, 2.08-2.35 microns, 3.5-5.5 microns, 7.8-10 microns, and 11.08-12.55 microns; and the color separation filter meets beam split operating requirement of a remote sensing detection system.

The invention relates to a method for preparing yttrium-neodymium magnesium alloy and the yttrium-neodymium magnesium alloy. A graphite block is adopted as an anode, a molybdenum rod serves as an inertia cathode, a molybdenum crucible serves as an alloy receiver, mixtures of yttrium oxide, neodymium oxide and magnesium oxide are added into a fluoride molten salt electrolyte system composed of yttrium fluoride, neodymium fluoride and lithium fluoride, then direct currents are guided for electrolysis and finally the yttrium-neodymium magnesium alloy is obtained; the mass ratio of the yttrium fluoride to the neodymium fluoride to the lithium fluoride in the fluoride molten salt electrolyte system is 5-20 to 70-90 to 5-10, the mass percent ratio of the neodymium oxide and the yttrium oxide to the magnesium oxide is 99-80 to 1-20, the mass percent ratio of the neodymium oxide to the yttrium oxide is 99-1 to 1-99, and the electrolysis temperature ranges from 1050 DEG C to 1150 DEG C. The method has the advantages that the technological process is simple, the cost is low, the product ingredients are stable, just carbon dioxide and little carbon monoxide are generated in the technological process, environmental pollution is small, and the process is friendly to environment and is suitable for large-scale production.

The invention belongs to a field of optical thin films and specifically relates to an infrared optical constant calculating method for a yttrium fluoride optical thin film in an infrared band. According to the invention, through constructing a four-oscillator composite model of a dielectric constant of the yttrium fluoride optical thin film, measured substrate-film spectrum reflectivity and spectrum spectral transmittance are taken as a compound target and a substrate-film physical model is utilized for back calculation of a dielectric constant of the thin film and the optical constant of the thin film is calculated out through the dielectric constant. The method provided by the invention has universality in optical constant calculation of yttrium fluoride optical thin film material prepared in all the different deposition ways.

The present invention is Er-doped transparent glass ceramics containing nanometer sodium yttrium fluoride crystal and its preparation and use, and relates to light emitting material technology. The glass ceramics has the molar composition of 40SiO2-25Al2O3-xNa2CO3-10YF3-yNaF-zErF3, where x=15-20, y=25-x-z, and z=0.05-2.0. It is prepared through a melt chilling process. The glass ceramics may have the Er3+ doping amount altered to regulate the intensity ratio between the red light and the green light emitted under the excitation of infrared ray, near monochromic green light emitting corresponding to low doping concentration and near monochromic red light emitting corresponding to high doping concentration.

The invention provides a photosensitizer coupled rare earth-doped LiAF4 nanocomposite material, its preparation method, and its application in the photodynamic therapy. The above photosensitizer coupled nanomaterial emits strong visible light under the irradiation of 980nm laser, and can sensitize the photosensitizer to generate singlet oxygen, so the nanomaterial can be used in the up-conversion photodynamic therapy. The method has the advantages of simplicity and high yield, the prepared nanomaterial has the advantages of good water solubility, excellent luminescence performance and high singlet oxygen yield, and the singlet oxygen can well kill cancer cells, so the nanomaterial can be applied in the diagnosis and treatment field of tumor diseases.

The invention relates to a method for preparing a rare-earth doped potassium yttrium fluoride up-conversion luminescence nano material. The method comprises the following steps: 1) weighing yttrium oxide, sylvite and a fluorine source, adding in an oleic acid/oleylamine-containing solvent system, stirring and mixing, thus obtaining a first uniform solution; 2) weighing ytterbium fluoride and a rare-earth activator, adding in the oleic acid/oleylamine-containing solvent system, stirring and mixing, thus obtaining a second uniform solution; 3) rapidly heating the first uniform solution to a high temperature, and meanwhile rapidly filling the second uniform solution, and sufficiently stirring to react, thus obtaining a third uniform solution; and 4) cooling the obtained solution to room temperature, performing centrifugal separation, washing, and drying, thus obtaining the rare-earth doped potassium yttrium fluoride up-conversion luminescence nano material. The method has the beneficial effects that the preparation period of the material is effectively shortened, new ideas and ways are provided for preparing the up-conversion luminescence nano material, large-scale popularization and application are facilitated, and the purposes of controllable the monodisperse particle size, high quantum yield and the like are solved.

The invention relates to the technical field of a semiconductor, and discloses a plasma etching method. On the basis of a conventional fluorocarbon gas, Ar and O2, an N-containing gas is added to serve as an etching gas so as to react with carbon ions in plasma to generate a CN polymer depositing at the inner wall of a plasma etching cavity and the surface of a spray head, such that it is ensured that a yttrium oxide surface and yttrium fluoride generated through reaction are prevented from physical bombardment effect of the plasma, YFx sputtering is reduced, generation of yttrium-containing particles and residues are reduced, the residues brought when yttrium oxide covering the surface of the spray head is disposed at the surface of a semiconductor substrate to be etched during a plasma etching process is further decreased or even eliminated, and the surface quality of plasma etching is improved. Besides, the plasma etching method provided by the invention can also reduce damage caused by physical bombardment on the yttrium oxide covering the surface of the spray head during the plasma etching process and prolongs the service life of the spray head.