34 results about "Europium(III) oxide" patented technology

The invention discloses an infrared colorful false proof material and making method, which comprises the following steps: selecting certain proportional alumina, lead fluoride, beryllium fluoride, calcium fluoride, strontium fluoride, lanthanum fluoride, europium trioxide, samarium trioxide, thulium trioxide and gadolinium trioxide as raw materal; blending these raw materials; grinding; heating; insulating; heating again; quenching; cooling; grinding; packing. The spectral scale is broad to form 3-6 different colorful fluorescences stimulated by laser at 960nm, which is fit for falseproof marking material.

The invention discloses a preparation method of titanium dioxide europium-doped nano-film sol. In the method, metatitanic acid (H2TiO3) is washed by distilled water repeatedly, and put into an oven to be baked for 12 hours at 60 DEG C; europium sesquioxide (Eu2O3) is dissolved in nitric acid to obtain europium ion; H2Ti3 and K2CO3 are evenly mixed according to mol ratio of 5.2:1, europium ion is added into the mixture according to 0.2-3% of mass fraction of titanium, and little absolute ethyl alcohol is added into the mixture simultaneously, the mixture being fully ground is put in a muffle to be calcined for 6-15 hours at 600-1000 DEG C, the material being calcined is taken out and added into hydrochloric acid of 1mol/L according to the proportion of 4g/L to be stirred, filtration washing is carried out for 24-72 hours, the filter cake is added into 4-n-butyl ammonium hydroxide or ethylene dimine according to the proportion of 0.4g/L to be stirred for 24-72 hours, is then centrifugated at the high speed centrifugation of 10000r/min to obtain titanium dioxide europium-doped nano-film sol. The invention is convenient in operation, low in cost and suitable for industrialized prosuction.

A preparation method of a solar cell down-conversion material YVO4:Eu3<+> nanopowder comprises the following steps: weighing yttria (Y2O3) and europium(III) oxide (Eu2O3) according to a molar ratio of 1:1, mixing, adding the obtained mixture to nitric acid, and dissolving Y2O3 and Eu2O3 to obtain a clarified solution containing yttrium ions and europium ions; adding ammonium metavanadate (NH4VO3) to the clarified solution according to a molar ratio of ammonium metavanadate to the above metal ions of 1:1; adding a citric acid solution with the concentration of 1.4-1.6mol/L to make a molar ratio of citric acid to the metal ions reach 2:1; taking a quantitative amount of ammonia water, and slowly adding the quantitative amount of ammonia water to the above obtained citric acid-containing solution; adding a certain amount of a dispersing agent, and aging for a period of time to obtain a sol; and heating the sol to obtain xerogel, and grinding the xerogel to obtain the YVO4:Eu3<+> nanopowder.

The invention discloses a formula for producing a low-cost ultrahigh-speed heat-conducting LED die-cast aluminum radiator. The low-cost ultrahigh-speed heat-conducting LED die-cast aluminum radiator comprises, by weight, 1%-10% of tin, 1%-10% of magnesium, 1%-10% of zinc, 0.5%-3% of nano-europium oxide, 0.5%-3% of nano-terbium oxide, 0.1%-1% of raney nickel catalysts and the balance aluminum. Compared with an existing cast-aluminum radiator which is high in price and contains precious metal or alloy materials on the market, the LED die-cast aluminum radiator produced through the formula has the same or higher heat conduction coefficient and is lower in cost; the LED die-cast aluminum radiator has extremely high market advantages and market competitiveness under the combined action of the two advantages.

A color-changing coating for copper comprises the components in parts by mass as follows: 100 parts of potassium iodide, 15-30 parts of nitric acid, 15-20 parts of cupper nitrate, 15-25 parts of strontium nitrate, 25-45 parts of aluminum nitrate, 10-25 parts of mercury nitrate, 10-20 parts of silver nitrate, 5-10 parts of europium oxide, 10-20 parts of dysprosium oxide, 10-15 parts of ammonium carbonate, 5-10 parts of ammonium bicarbonate, 15-25 parts of sulfur dioxide and 10-20 parts of water. The color-changing coating turns red from orange at the temperature of 35 DEG C, turns orange yellow from red at the temperature of 40 DEG C, turns orange red from orange yellow at the temperature of 45 DEG C and turns brown from orange red at the temperature of 50 DEG C.

The invention relates to the technical field of fluorescent powder preparation and relates to a fluorescent powder capable of exciting white light emission and suitable for ultraviolet LED and a preparation method thereof. The method comprises the following steps: S1) respectively weighting sodium carbonate, barium carbonate, ammonium dihydrogen phosphate or diammonium hydrogen phosphate, europiumoxide and manganese carbonate at mole ratio of 0.5:(0.995-x):1:0.0025:x, milling and uniformly mixing, thereby acquiring a mixture; S2) putting the mixture into a high temperature furnace under a reducing atmosphere, standing by and reacting, thereby acquiring an initial product of fluorescent powder; S3) cooling the initial product of fluorescent powder and then milling, thereby acquiring an endproduct of fluorescent powder with a chemical formula of NaBa1-x-yPO4:Eu2+y-Mn2+x and used for coating an ultraviolet LED chip. The fluorescent powder prepared according to the invention is a singlesubstrate white light fluorescent powder, so that the re-absorption problem of multi-powder combining schemes can be avoided. Phosphate is served as the substrate of the fluorescent powder, so that the heat stability is high, the defect of color drifting phenomenon during use process caused by different heat stabilities of different powders can be further avoided, and the purposes of enhancing thestability of fluorescent powder and increasing the luminous efficiency can be achieved.

The invention discloses radiating type lighting LED lamp glass which is prepared from the following raw materials in parts by weight: 10 to 30 parts of silicon dioxide, 25 to 45 parts of europium oxide, 10 to 30 parts of potassium carbonate, 15 to 35 parts of lauric acid, 10 to 40 parts of glass powder, 5 to 25 parts of glass fiber, 2 to 10 parts of binder, 5 to 15 parts of photo-diffusion powder, 3 to 13 parts of antifog additive and 4 to 16 parts of heat conduction powder. The radiating type lighting LED lamp glass has the advantages of convenient processing technology and long service life.

The invention discloses non-stoichiometric oxynitride nano powder and a preparation method thereof. The preparation method comprises the following steps: firstly, dissolving europium oxide powder, tantalum pentoxide powder and urea in absolute ethyl alcohol, carrying out ball milling to obtain mixed slurry, drying the mixed slurry to obtain mixed precursor powder, calcining the mixed precursor powder in a protective atmosphere to obtain EuTa(O, N)3 oxynitride nano powder, and carrying out ammonification annealing treatment on the EuTa(O, N)3 oxynitride nano powder in an ammonia atmosphere to obtain the oxynitride nano powder EuTaOaNb with the non-stoichiometric ratio, wherein a is more than or equal to 1.5 and less than or equal to 2.5, b is more than or equal to 0.5 and less than or equal to 1.5, and a:bis not equal to 2:1. According to the invention, the method has the advantages of low cost, simple process, high product purity and the like, and the prepared product is good in dielectric property and magnetism.

The invention relates to orange-red rear-earth phosphors and a preparation method thereof. The orange-red rear-earth phosphors are prepared from strontium carbonate, calcium chloride, strontium chloride hexahydrate, strontium fluoride, strontium bromide, aluminum hydroxide, boric acid and europium oxide serving as raw materials by adopting a high-temperature solid state method. The preparation method comprises the following steps of: uniformly mixing the raw materials according to proportions, pre-sintering for 3-6 hours at 400-500 DEG C, cooling to a room temperature, taking out the raw materials and uniformly grinding again, reducing and sintering at a CO atmosphere for 4-10 hours at 1000-1200 DEG C, and grinding fine obtained sinters to obtain final products. The orange-red rear-earth phosphors have high luminous efficiency, good stability and very high quenching temperature and are suitable for InGaN chips giving out ultraviolet lights with about 400nm wavelength.

The invention discloses a ceramic for heat-resistant we-resistant nozzles. The ceramic is prepared from the following raw materials in parts by weight: 3-5 parts of europium oxide, 2-3 parts of dysprosium oxide, 4-7 parts of kyanite, 1-1.5 part of cadmium carbonate, 1-2 parts of sodium peroxide, 20-25 parts of quartzite, 22-27 parts of albite, 10-14 parts of nano titanium boride, 5-8 parts of nano tungsten carbide, 1-2 parts of sodium hydroxide, appropriate amount of deionized water, 3-4 parts of ethyl orthosilicate, appropriate amount of ethyl alcohol and 4-6 parts of an assistant. By adding europium oxide, dysprosium oxide, nano titanium boride and nano tungsten carbide, the hardness, the wear resistance and the heat resistance are improved, and the service lives of the nozzles produced by the ceramic is 2-3 times longer than the aluminum alloy nozzles; and by using the assistant, the surface smoothness, the wear resistance and the heat resistance of the ceramic can be improved.

The non-radioactive environment protecting energy storage luminous ceramic glaze material is prepared with strontium carbonate, Al2O3, boric acid, Eu2O3, Dy2O3, borax, quartz, niter, limestone, talcum and sodium fluorosilicate, and through mixing and other steps. It has the advantages of no radioactivity and long luminous time.