363 results about "Cerium doping" patented technology

The invention relates to a light source (1), having at least one LED (2) for emitting a primary radiation (4) and at least one luminescence conversion body (3) having at least one luminescent material for converting the primary radiation (4) into a secondary radiation (5). The luminescence conversion body is a polycrystalline ceramic body. The LED is based on GaInN and emits blue primary radiation. The ceramic body comprises for example a luminescent material based on a cerium-doped yttrium aluminum garnet. This luminescent material emits yellow secondary radiation. Blue primary radiation and yellow secondary radiation penetrate through the luminescence conversion body and are perceived as white light by the observer. In order to produce the luminescence conversion body, provision is made of a polycrystalline ceramic body which is united with a solution of a dopant. By means of a thermal treatment, the dopant (activator) diffuses into the ceramic body, the luminescent material being formed.

Disclosed herein are cerium doped, garnet phosphors emitting in the yellow region of the spectrum, and having the general formula (Y,A)3(Al,B)5(O,C)12:Ce3+, where A is Tb, Gd, Sm, La, Sr, Ba, Ca, and / or Mg, and substitutes for Y, B is Si, Ge, B, P, and / or Ga, and substitutes for Al, and C is F, Cl, N, and / or S, where C substitutes for O. Relative to a solid-state-reaction method, the instant co-precipitation methods provide a more homogeneous mixing environment to enhance the distribution of the Ce3+ activator in the YAG matrix. Such a uniform distribution has the benefit of an increased emission intensity. The primary particle size of the as-prepared phosphor is about 200 nm, with a narrow distribution.

A compact includes a mixture of a solid binder and at least one nanopowder phosphor chosen from yttrium oxide, yttrium tantalate, barium fluoride, cesium fluoride, bismuth germanate, zinc gallate, calcium magnesium pyrosilicate, calcium molybdate, calcium chlorovanadate, barium titanium pyrophosphate, a metal tungstate, a cerium doped nanophosphor, a bismuth doped nanophosphor, a lead doped nanophosphor, a thallium doped sodium iodide, a doped cesium iodide, a rare earth doped pyrosilicate, or a lanthanide halide. The compact can be used in a radiation detector for detecting ionizing radiation.

One embodiment provides a method for fabricating a translucent phosphor ceramic compact comprising: heating a precursor powder to at least about 1000° C. under a reducing atmosphere to provide a pre-conditioned powder, forming an intermediate compact comprising the pre-conditioned powder and a flux material, and heating the intermediate compact under a vacuum to a temperature of at least about 1400° C. In another embodiment, the compact may be a cerium doped translucent phosphor ceramic compact comprising yttrium, aluminum, oxygen, and cerium sources. Another embodiment may be a light emitting device having the phosphor translucent ceramic provided as described herein.

The invention relates to a solar glass self-cleaned high anti-reflection coating and a production method thereof, wherein the solar glass self-cleaned high anti-reflection coating is composed of antireflection components, self-cleaning components, latent light conversion components, film coating regulators and solvent water, and simultaneously has triple functions including self-cleaning, antireflection and near ultraviolet light conversion. In the formula of the coating, the antireflection components are nano SiO2 hydrosols of different sizes; the self-cleaning components are lanthanum cerium doped nano TiO2 and nano SiO2; the latent light conversion components are lanthanum nitrate, cerous nitrate, terbium nitrate, ammonium dihydrogen phosphate, phosphoric acid and ascorbic acid; after the latent light conversion components are treated, a silica coated phosphate fluorescent material La1-x-yCexTbyPO4 is generated, wherein x=0.02-0.5, and y=0.02-0.05; the film coating regulators include a surface active agent and an organosilicone coupling agent. Once the solar glass self-cleaned high anti-reflection coating disclosed by the invention is applied to solar glass, the light transmittance of the solar glass and the photoelectric conversion efficiency of crystalline silicon solar batteries can be significantly improved and stabilized, and the manual cleaning cost and maintenance management cost of the solar batteries in the process of running are reduced, therefore, the solar glass self-cleaned high anti-reflection coating can replace existing solar glass anti-reflection coatings.

The invention discloses a rare earth cerium doped Ti-based manganese dioxide electrocatalytic electrode and a preparation method thereof. The electrode consists of an internal layer of Ti substrate, an interlayer of tin-antimony oxide and a surface coating of cerium doped manganese dioxide, wherein, the internal layer of Ti substrate is a pure titanium plate, the interlayer of tin-antimony oxide is a mixture consisting of SnO2 and Sb2O5, the molar ratio of tin to antimony is 3.7:1, and in the surface coating, the molar ratio of cerium to manganese dioxide is 1:25-50. The preparation method comprises the following steps: polishing, alkali washing, pickling and acid embossing the pure titanium plate, then repeatedly painting a coating solution, carrying out a thermal decomposition process on the Ti substrate to prepare the interlayer of tin-antimony oxide and the surface coating of cerium doped manganese dioxide in order. The cerium doped Ti-based manganese dioxide electrode disclosed in the invention has low potential of chlorine evolution and high electrocatalysis capability, and can be used for treating the dyeing and finishing effluents.

A single crystal heat treatment method having a step of heating a single crystal of a specific cerium-doped silicate compound in an oxygen-poor atmosphere at a temperature T1 (units: ° C.) that satisfies the conditions represented by formula (3) below 800≦T1<(Tm1−550)  (3) (wherein Tm1 (units: ° C.) represents the melting point of the single crystal).

The invention discloses a cerium-doped nano titanium dioxide / activated carbon fiber composite photocatalyst for air purification and a preparation method thereof. The preparation method comprises the following steps: doping cerium nitrate into nano titanium dioxide to obtain the cerium-doped nano titanium dioxide suspension, putting proper amount of activated carbon fiber into the suspension, soaking for 20-60 minutes under ultrasonic conditions, taking out, airing, and keeping the temperature at 200-220 DEG C for 2-4 hours, thereby obtaining the cerium-doped nano titanium dioxide / activated carbon fiber composite photocatalyst for air purification. Compared with the prior art, the rare-earth cerium is doped into the nano titanium dioxide, thereby prolonging the service life of photovoltaic electron-hole pairs, enhancing the quantum effect of the nano titanium dioxide, and further enhancing the photocatalytic activity of the nano titanium dioxide; and the whole method is simple and easy to control; and the product prepared by the method has high degradation efficiency for volatile organic pollutants, especially formaldehyde gas, reaching more than 90%.

The invention discloses a preparation method of an electrochemical chlordimeform sensor based on a composite cerium-doped porous nanocomposite, and belongs to the technical field of novel nano functional materials and biosensors. The method comprises the steps that the novel two-dimensional nanocomposite Ce-MoO3 / TiO2@g-C3N4 is prepared firstly, and by means of the good biocompatibility and large specific surface area of the material, the material is loaded with a chlordimeform antibody; horse radish peroxidase is fixed by means of the crosslinking action of glutaraldehyde; when detection is conducted, the horse radish peroxidase can catalyze hydrogen peroxide to generate an electrochemical signal, and by means of the influence of specific quantitative combination of the antibody and an antigen on electron transmission capability, the current intensity is correspondingly decreased, and the electrochemical biosensor which is low in cost, high in sensitivity, good in specificity, rapid in detection and easy to prepare is finally prepared for detecting chlordimeform.

The invention relates to a method for electrolyzing orange G by adopting a cerium-doped tin antimony oxide coated titanium electrode. The invention belongs to the technical field of electrochemistry and environmental chemistry, in particular to a method of carrying out oxidative degradation research on orange G analog waste water in an aseptate electrode tank by adopting a constant current electrolytic method by taking a self-made cerium-doped tin antimony oxide coated titanium electrode as the anode and a titanium plate as the cathode. Under the optimum process conditions that the effective areas of a negative electrode and a positive electrode are both 2.5cm*2.5cm, the distance between the electrodes is 1.5cm, i is equal to 4.8mA / cm<2>, the concentration of the orange G is 40mg / L, the concentration of NaCl is 0.35mol / L and pH is 7, the time of electrolysis is 30min, and the removing rate of the orange G reaches 99.4 percent. The invention improves the removing effect of the orange G with low energy consumption and no secondary pollution and meets the actual demands of industry.

The present invention provides for a composition comprising an inorganic scintillator comprising a gadolinium halide, optionally cerium-doped, having the formula AnGdXm:Ce; wherein A is nothing, an alkali metal, such as Li or Na, or an alkali earth metal, such as Ba; X is F, Br, Cl, or I; n is an integer from 1 to 2; m is an integer from 4 to 7; and the molar percent of cerium is 0% to 100%. The gadolinium halides or alkali earth metal gadolinium halides are scintillators and produce a bright luminescence upon irradiation by a suitable radiation.

The invention discloses a low-temperature denitrification catalyst and a preparation method thereof. The catalyst takes titanium oxide as a carrier and ferric oxide as an active ingredient, and is doped with rare earth metal cerium, wherein the weight of ferric oxide accounts for 2-5% of that of titanium oxide, and the weight of rare earth metal cerium accounts for 0.5-1% of that of titanium oxide. The catalyst and the preparation method have the benefits that ferric oxide is added to the catalyst to serve as the active ingredient, so that the denitrification catalyst can exert the maximum catalytic activity within a temperature range of 200-400 DEG C; and in addition, cerium doping allows the activity of the catalyst to be improved greatly, can restrain generation of ammonium sulfate on the surface of the catalyst, and can improve the sulfur resistance of the catalyst.

The invention relates to a method for growing a cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material. The method comprises the following steps of: creating a reasonable vertical temperature grade environment by using a vertical temperature grade method and different heating power distributions of a heating body; placing a pretreated material into a crucible to heat and fuse; standing a fusant in a temperature field; enabling the fusant to crystallize from the bottom through controlling the sectional cooling processes of speeds; and movably growing the crystal on a solid-liquid interface from bottom to top. Compared with the common directional solidification method, such as bridgman-stockbarger method, in the method for growing the cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material, the possible problem of instable interface is solved due to no mechanical moving parts, and meanwhile the relative doping uniformity of a closed growth system is guaranteed. The cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material grown by the method is stable in quality and has good phototransformation performance, photo-mixing performance and heat resistance and application potential on various light emitting devices, such as large power white light LED (Light Emitting Diode).

The invention relates to a cerium-doped nanometer barium ferrite film and a preparation method thereof. The film is characterized in that the formula comprises 1.48 to 1.60g / 100ml of glycol, 2.51 to 2.71g / 100ml of citric acid, 1.74g / 100ml of ferric nitrate, 0.125g / 100ml of barium nitrate, and 0.04 to 0.125g / 100ml of cerium nitrate. The preparation method comprises: a crystalline nanometer barium ferrite film is prepared on a quartz substrate; the cerium-doped nanometer barium ferrite film with high purity is obtained through the optimization of preparation technology; and the film can be used for preparing magnetic recording materials and wave-absorbing materials. The method has the advantages that the method has simple process flow and low cost, is convenient for preparing films on various substrates with different shapes, is easy to obtain an uniform and multi-component oxide film, is easy for quantitative doping, and can effectively control the constituents and a microscopic structure of the film.

The invention relates to cerium-doped lanthanum zirconate nano powder and a preparation method thereof. The cerium-doped lanthanum zirconate nano powder is characterized in that the cerium-doped lanthanum zirconate nano powder is of a single-phase pyrochlore structure, has the particle size of 30 to 250nm, is uniformly distributed, is of a sphere shape, is prepared by carrying out doping on the Zr position by Ce and has the chemical formula of La2Zr2-xCexO7, wherein x is less than or equal to 0.5 and more than or equal to 0.1. The cerium-doped lanthanum zirconate nano powder is of the single-phase pyrochlore structure, has excellent anti-sintering performance, has small particle size, is uniformly distributed, has regular morphology and has stable structure at high temperature; the thermal expansion coefficient of the powder from the room temperature to the temperature of 1,400 DEG C can reach 12*10<-6<K<-1>; and the cerium-doped lanthanum zirconate nano powder has the thermal conductivity of lower than 1.5W.m<-1>.K<-1>, is particularly suitable for preparation of various high temperature resistance thermal barrier coating or high temperature resistance abrasion-resistant anticorrosion coating materials, and is applied to the industries of aerospace, gas turbines, ships, vehicles, machinery, chemical industry and the like.

The invention provides a preparation method and application of cerium-doped titanium dioxide / graphene aerogel and relates to aerogel and application thereof, aiming at solving the problems that titanium dioxide prepared by an existing method has poor catalytic activity under visible light and a powder material is difficult to recycle. The method comprises the following steps: 1, preparing a graphene oxide solution; 2, preparing cerium-doped titanium dioxide; 3, preparing the cerium-doped titanium dioxide / graphene aerogel. The cerium-doped titanium dioxide / graphene aerogel is used for degradingphenol-containing wastewater. The cerium-doped titanium dioxide / graphene aerogel prepared by the invention can be used for degrading phenol under the illumination of the visible light and the maximumlight degradation rate is 90.6 percent after the phenol is degraded for 3h; in a degradation process of surface water organic pollutants, the cerium-doped titanium dioxide / graphene aerogel has a great application potential. The cerium-doped titanium dioxide / graphene aerogel can be obtained.

The invention provides a preparation method of a hollow boron / cerium co-doped nanometer titanium dioxide fiber material, and relates to the preparation method of a photochemical catalyst. The method comprises the following steps of: preparing the hollow boron / cerium co-doped nanometer titanium dioxide fiber material with large specific surface area and high photocatalytic activity by using an alcoholysis method, doping the boron and the cerium in the preparation process, wherein the doping amount calculated based on the molar ratio of B, Ce and Ti is that the proportion of the B to the Ce to the Ti is (0.1-1.0) to (0.05-1.0) to 10.0. The preparation method provided by the invention has the advantages of available raw materials, simple preparation process and short preparation time; the hollow nanometer titanium dioxide fiber material is obviously increased in the photocatalytic activity after being doped with the boron and the cerium. The prepared co-doped titanium dioxide fiber framework is constituted by anatase nanoparticles less than 50nm with narrow aperture distribution, the average aperture is 20.5nm, the specific surface area is larger than 220 square meters per gram and the photocatalytic activity is high, thus being applicable to the photocatalysis field.

A method for enhancing the light yield of a single crystal of cerium doped lutetium orthosilicate (LSO) in response to irradiation with high energy radiation includes diffusing oxygen into the crystal by heating the crystal for a period of time in an ambient containing oxygen. This process of thermal oxygenation of the crystal effectively supplies oxygen to fill at least some of the oxygen vacancies in the body of monocrystalline LSO. A scintillation detector comprises a monocrystalline body of LSO enhanced by oxygen diffusion into the crystal.

The invention provides a method for catalytic degradation of high-concentrated organic wastewater by micro-wave cooperating with perovskite. Cerium-doped La1-xCexBO3 perovskite prepared by the citric acid complexation method is adopted as a catalyst, wherein B is Fe, Co or Ni, and doping content of Ce is x which is from 0.1 to 0.9. The perovskite catalyst is added into organic wastewater, and additive amount of the perovskite is from 2.0g / L to 8.0g / L. Irradiation time is from 2 minutes to 10 minutes under the condition that a micro-wave power is from 200 to 700 watts. Rate of removal of the organic wastewater is calculated according to an absorbance. Aeration can be kept or air is continuously inflated in a catalytic degradation reaction and by means of oxygen transfer of the perovskite catalyst, a continuous reaction can be achieved. Various reactive oxygen species are generated in situ on the catalyst surface by using self oxygen storage performance and oxygen transfer performance of perovskite oxide instead of adding oxidants such as H2O2, and then degradation of organics can be achieved under the micro-wave cooperation effect.

A compact includes a mixture of a solid binder and at least one nanopowder phosphor chosen from yttrium oxide, yttrium tantalate, barium fluoride, cesium fluoride, bismuth germanate, zinc gallate, calcium magnesium pyrosilicate, calcium molybdate, calcium chlorovanadate, barium titanium pyrophosphate, a metal tungstate, a cerium doped nanophosphor, a bismuth doped nanophosphor, a lead doped nanophosphor, a thallium doped sodium iodide, a doped cesium iodide, a rare earth doped pyrosilicate, or a lanthanide halide. The compact can be used in a radiation detector for detecting ionizing radiation.

A nano-titanium dioxide fabric finishing agent with the surface coated with cerium-doped zinc oxide is characterized by being prepared by the following steps: firstly, hydrolyzing and depositing cerium chloride and zinc chloride on the surface of nano-titanium dioxide to obtain the nano-titanium dioxide with the surface coated with the cerium-doped zinc oxide, and performing surface treatment by acoupling agent KH-550 to obtain organic silicon modified ultraviolet-resistant granules; secondly, performing polymerization on hydroxyethyl acrylate, acrylic acid and butyl acrylate to obtain polyacrylic acid emulsion; finally, preparing aqueous dispersion of the organic silicon modified ultraviolet-resistant granules and coating with the polyacrylic acid emulsion, to obtain the nano-titanium dioxide fabric finishing agent with the surface coated with cerium-doped zinc oxide. The fabric finishing agent provided by the invention has high stability; after being finished, the fabric has excellent ultraviolet-resistant effect, high durability and soft hand feeling.

A detector using scintillating crystals is provided. The scintillating crystal is based on cerium doped lutetium yttrium orthosilicate (Ce:LYSO). With calcium (Ca) doped into Ce:LYSO, the electrovalence of Ce is further uniformly distributed. The scintillating crystal obtains high stability with 2 to 10 times greater electrical degree than that of a general scintillating crystal. Thus, radiative induction to cancer cells is improved and distribution of the cancer cells is easily figured out.

The invention relates to a functional artificial joint on surface of cerium-loaded nanotube array and preparation method thereof. The surface of the metal substrate of the artificial joint is provided with one cerium-doped sodium titanate nanotube array layer with a tubular structure; the inside of the layer thereof is further loaded with a bone morphogenetic protein (BMP). The preparation methodfor the functional artificial joint on surface of cerium-loaded nanotube array includes the steps: selecting pure titanium or titanium alloy to process the artificial joint; then adopting two-step oxidation technique to obtain a titanium dioxide nanotube array layer on the surface of the pure titanium or titanium alloy artificial joint; then adopting alkali liquor hydrothermal synthesis techniqueto transform the titanate nanotube array layer into sodium titanate nanotube array layer; doping rare-earth element cerium in the sodium titanate nanotube array layer through solution pickling ion exchange, and finally adopting a centrifugal loading technique to load the bone morphogenetic protein in the cerium-doped sodium titanate nanotube array layer.

The invention discloses a packaging method for a cerium-doped halogenated lanthanum scintillation crystal. The packaging method is characterized in that the scintillation crystal sequentially undergoes grinding (to remove a corrosion layer), polishing and surface roughness in a hypoxia dry environment; a reflecting surface of the crystal and a reflection material form a diffuse reflection surface, a light-emitting surface and a high-refraction-rate optical coupling glue form a light-emitting port, and the optimum state of the crystal light-emitting surface is of a sawtooth-shaped optical microstructure; a scintillation crystal packaging structure which is resistant to oscillation, temperature shock and damp is designed; and three layers of composite protecting structures comprising a rigid sleeve pipe, a foaming heat-insulating buffer layer and a casing are arranged. An optical coupling agent at the front end of the crystal and an elastic gasket at the rear end of the crystal are made of soft elastic materials. A gap is reserved between a rear cover and a rigid gasket, the heat-insulating effect is improved, and a double-way compound sealant is adopted to adhere the position of a joint of the casing.

The invention relates to a preparation method of cerium-doped NH2-UiO-66 / indium zinc sulfide composite visible-light-induced photocatalysts. The preparation method comprises the following steps: preparing cerium-doped NH2-UiO-66 by adopting a solvothermal method, then carrying out a hydrothermal reaction by using an in-situ growth method to separately obtain a cerium (IV)-doped NH2-UiO-66 / indium zinc sulfide composite visible-light-induced photocatalyst and a cerium (III)-doped NH2-UiO-66 / indium zinc sulfide composite visible-light-induced photocatalyst. The preparation method has the beneficial effects that cost is low, repeatability is high, and the preparation conditions are mild and controllable. The prepared cerium-doped NH2-UiO-66 / indium zinc sulfide composite visible-light-induced photocatalysts are green environment-friendly photocatalysts, and the cerium-doped NH2-UiO-66 is compounded with indium zinc sulfide, so that photocatalytic degradation activity can be effectively improved, and therefore, the preparation method has a certain application prospect in the field of water pollution treatment.

The invention discloses a preparation method of doped nanometer zinc oxide and an application of doped nanometer zinc oxide in photocatalysis. The preparation method comprises the following steps: polyvinyl alcohol, zinc nitrate hexahydrate and aluminum nitrate nonahydrate or cerium nitrate hexahydrate or lanthanum nitrate hexahydrate are taken as raw materials, a homogeneous aqueous solution is prepared from the raw materials and subjected to vacuum freeze drying and calcination, and aluminum, cerium or lanthanum doped nanometer zinc oxide powder is obtained. The flow of the preparation process is simple, one-step uniform mixing is performed in a doping process, the raw materials are easily available, and the preparation process is clean and pollution-free; the prepared aluminum doped nanometer zinc oxide powder is agglomeration-free, has photocatalytic activity better than that of pure nanometer zinc oxide when used for degrading reactive brilliant blue KN-R under ultraviolet light, while rare-earth metal cerium doped nanometer zinc oxide can degrade organic dyes by using visible light and has good application prospect in organic dye wastewater treatment.

The invention relates to a method for manufacturing a white light LED by single crystals. YAG:Ce3+ single crystals are used as a luminescent material of the white light LED. The design idea of the method comprises the following steps of: heating the raw materials of 45 to 70 percent of Al2O3, 20 to 40 percent of Y2O3 and 0 to 4 percent of Ce2O2 in a proportion to the temperature of 1,970 DEG C in an iridium crucible according to the formula of cerium-doped yttrium aluminum garnet, and heating the raw materials into a melt; growing a pure YAG crystal serving as a seed crystal in a D400 single crystal furnace so as to obtain complete single crystals which have various concentrations without obvious defect; adhering the crystals to organic glass and cutting into wafers with the needed dimension and the thickness of 0.2 to 5mm by using a carbon plate cutting machine; and soaking for 12 hours by using acetone, performing coarse sand and fine sand grinding, polishing two sides of the crystals for over 6 hours by using a polishing machine, performing microscope detection to determine no sand hole or defect, and packaging the processed crystals with different concentrations and thicknesses on an LED light-emitting diode by using a high temperature resistant colloid. The crystals have the advantages of excellent heat conductivity and physical and chemical stability, and capacities of effectively improving the luminous efficiency of the LED and prolonging the service life of the LED.