Colourless phosphorescing green glowing luminophor
SUBSTANCE: disclosed is a colourless phosphorescing luminophor, which is a coordination compound of terbium (III) with [2-(aminocarbonyl)phenoxy]acetic acid (HL2) and having formula Tb(L2)3, and specifically: , having high quantum efficiency of luminescence, considerable luminescence intensity and fluorescence maxima at 20500, 18300, 17000, 16000 cm-1.
EFFECT: possibility of use in protecting bond payer and documents from forgery, and as radiating substances in electroluminescent devices.
1 dwg, 1 ex
The invention relates to the phosphorescent phosphors, particularly to those which are colorless in daylight. Such phosphors are used in remedies securities and documents from fraud, as well as emitting substances in electroluminescent devices. (Katkov M.A., Vituhnovskaya A.G., M. N. Bochkarev. // USP. 2005. T. No. 12. S-1215.)
Known phosphorescent phosphors green fluorescence representing various coordination compounds of lanthanides with carboxylate ligands such as Tris-benzoate and Tris-nitrobenzoate of terbium. These coordination compounds have low quantum efficiency of luminescence. (V.Tsaryuk, .Zhuravlev, V.Zolin, P.Gawryszewska, J.Legendziewicz, V.Kudryashova, I.Pekareva. Regulation of excitation and luminescence efficiencies of europium and terbium benzoates and 8-oxyquinolinates by modification of ligands // Journal of Photochemistry and Photobiology A: Chemistry 177 (2006) 314-323).
Partially the drawbacks are eliminated by the coordination compound of terbium(III) ortodoxising acid (HL1), having the formula Tb(L1)3(orthoxylene of terbium(III)), which is colorless phosphorescent phosphor green fluorescence, which is selected as the closest analogue of the prototype. Compared with the above analogs it has a large quantum efficiency of luminescence, namely 5 times for Tris-benzoate terbium(III) and as for Tris-nitrobenzoate of terbium(III). (Eliseeva, S., O. Kotova, Kuzmina N. et al. // Synth. Met. 2004. V.141. P.225.)
The disadvantages are the closest analogue is low intensity and quantum efficiency of luminescence.
The technical objective of the claimed invention to provide a colorless effective phosphorescent phosphor green fluorescence with high intensity luminescence.
To solve this problem is proposed colorless phosphorescent phosphor, which represents a coordination compound of terbium(III) with [2-(aminocarbonyl)phenoxy] acetic acid (HL2) and having the formula Tb(L2)3namely:
Unlike the prototype of the proposed phosphor as a ligand contains [2-(aminocarbonyl)phenoxy]acetic acid (HL2), which provides coordination compound of terbium (III) General formula TbL3the novelty.
The drawing shows the luminescence spectra of the prototype (1) and declare (2) phosphor at room temperature, which represents the dependence of the luminescence intensity wave number.
As seen in the drawing, the inventive phosphor has a higher quantum efficiency of luminescence that is determined by the area under the curve of the spectrum of luminescence in the visible region compared to the prototype (7.7 times) and the greater the intensity of the luminescence, which is determined by the height of the peaks of the peaks in the luminescence spectra. The claimed substance has a maximum phosphorescence when 20500, 18300, 17000, 16000 cm-1.
The coordination compound of terbium(III) with [2-(aminocarbonyl)phenoxy]acetic acid was obtained by the electrochemical method of synthesis according to the method of the dissolved anode (NBD, Adherence, Oaasypow, Wppreview, Nemer. Complex compounds of metals with certain nitrogen-containing ligands, Zh. General chemistry). - 1976. - V.46. No. 3. - S.675).
An example of a specific implementation.
In the electrochemical cell was placed 50 ml of 0.05 M solution of [2-(aminocarbonyl)phenoxy]acetic acid (HL2) in methanol. As a background electrolyte add 0.5 g of lithium chloride. In the resulting solution was lower platinum electrode which is the cathode, and the electrode of the metal terbium, which is the anode and connected to a constant current source. Electrochemical synthesis are within 2 h 40 min, at a voltage of 10 V, a current of 25 mA and a current density of 10 mA/cm2. In the course of synthesis in the system, the following processes occur:
As a result of synthesis of a white precipitate is formed which is then filtered off, washed with ethanol and dried to constant weight. The output of the compounds obtained SOS the start-UPS amounted to 85,3%.
The results of the analysis of the obtained compound: Found (%): C, at 43.68; H, 3.22; N, 5.61; Tb, 21.44. C27H24N3O12Tb. Calculated (%): C, 43.74; H, 3.26; N, 5.67; Tb, 21.52.
The IR spectrum of the claimed synthesized coordination compounds detected absorption bands (cm-1) 3412 ν(N-H), 1609 δ(N-H), 1596 νas(COO-), 1420 νs(COO-). In the ultraviolet region of the spectrum when 33500 cm-1the detected absorption band (the logarithm of the coefficient of extinction is equal to 3.51).
Based on the above it can be concluded that the inventive phosphor has a higher efficiency (7.7 times) and the intensity of green fluorescence luminescence in comparison with the prototype, and therefore involves an inventive step, industrial applicability, i.e. meets the criteria of the invention.
Colorless phosphorescent phosphor green fluorescence, which is a coordination compound of terbium (III) General formula TbL3, characterized in that the ligand used [2-(aminocarbonyl)phenoxy]acetic acid (HL2), and having the formula Tb(L2)3namely:
SUBSTANCE: described is light-converting material containing a matrix and at least one composite which converts UV radiation to radiation of a different colour, with particle size from 10 nm to 1000 nm, selected from a group ZnO:Zn and rare-earth element compounds of formula: Mex aAy bRz c , where Me denotes a metal, selected from a group comprising yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, dysprosium, holmium, erbium, ytterbium, aluminium, bismuth, manganese, calcium, strontium, barium, zinc or mixture thereof; A denotes a metal selected from a group comprising cerium, praseodymium, neodymium, samarium, europium, gadolinium, dysprosium, holmium, erbium, terbium, ytterbium, titanium, manganese; R is an element selected from a group comprising oxygen, sulphur, boron, titanium, aluminium and/or compounds thereof with each other; a, b and c denote the charge on the Me ion, A or R, respectively, x≥1, 1.0 ≥ y ≥ 0.0001, z is defined by ax + by = cz. The invention also describes a composition for producing said material, containing the following in wt %: said composite - 0.001-10.0; matrix-forming component - the rest.
EFFECT: invention increases intensity of converting UV radiation to infrared radiation, blue to green spectrum region, and therefore increases plant yield.
27 cl, 25 ex
SUBSTANCE: invention can be used in production of inorganic yttrium oxysulphide-based multifunctional anti-Stokes luminophors which can be used for converting infrared radiation to visible luminescence, for protecting bond paper and documents, strict accounting forms, conformity marks of goods and articles, excise and identification marks, banknotes, as well as for making emergency and signal light systems, evacuation, fire, warning and indicator light marks, for pointers in shafts, tunnels, overpasses, metro and passages for information-direction boards in motorways and decorative cosmetics. The yttrium oxysulphide-based luminophor is activated by titanium ions and coactivated by magnesium ions, and also contains a cationic sublattice of trivalent ytterbium and erbium ions and has a chemical composition corresponding to the following empirical formula: (Y1-X-YYbxEry)202S:Ti0.12,Mg0.04, where 0.01<X<0.05; 0.01<Y<0.05.
EFFECT: more intense visible anti-Stokes luminescence during excitation of infrared radiation in the 0,90-0,98 mcm range.
7 cl, 1 tbl, 4 dwg
SUBSTANCE: invention describes a method of modifying anti-Stokes luminophors based on oxychlorides of rare-earth elements, involving treatment of a luminophor with low-melting glass with flow temperature of 560-600°C in amount of 7-20% of the weight of the initial luminophor at 560-600°C for 0.5-1 hour.
EFFECT: obtaining modified anti-Stokes luminophor with high output and high moisture resistance with retention of high level of luminous intensity during infrared excitation.
FIELD: physics, optics.
SUBSTANCE: invention relates to photoluminophors designed for converting emission of blue light-emitting diodes to the yellow-red region of the spectrum in order to obtain resultant white light, particularly to a cerium doped luminophor based on yttrium aluminium garnet used in two-component light-emitting diode light sources. The invention describes a luminophor for light sources which contain aluminium, yttrium, cerium, lutetium and oxygen in the following ratio: (Y1-xCex)3Al5O12 and 5-60 wt % over 100% (Lu1-yCey)2O3, where x=0.005-0.1; y=0.01-0.1. The invention provides a fine-grained luminophor with luminescent emission band maximum at λ≈590 nm, while lowering temperature and duration of synthesis.
EFFECT: use of such a luminophor in a two-component light source with a blue light-emitting diode enables to obtain resultant "warm" white light with high colour rendering index, increases uniformity of light scattering and reduces energy consumption during synthesis.
1 cl, 1 dwg, 6 ex
SUBSTANCE: invention is meant for the chemical industry and can be used to protect bond paper and valuable documents, strict accounting forms, conformity marks of articles, excise and certification marks. An infrared luminophor having formula Y2-x-yErxCeyO2S, where x=0.20-0.45; 1·10-4≤y≤5·10-3 is described.
EFFECT: obtaining an infrared luminophor based on yttrium oxysulphide activated by erbium ions and co-activated by cerium ions, which has minimal visible anti-stokes luminescence when excited with laser radiation in the 0,90-0,98 mcm range and high intensity of stokes infrared luminescence in the 1,5-1,5 mcm range.
1 cl, 1 tbl, 12 ex
FIELD: printing industry.
SUBSTANCE: valuable document has marking, which contains luminescent compound that has both anti-stokes and Stocks law luminescence, with composition of Ln 1-X-Y-Z YbX ErY CeZ MeI C MeVI D PI-D O4+D/2-C where: MeI - Li or Na, MeVI - W or Mo, Ln - Y, La, Gd, 0.1 ≤ x ≤ 0.9; 0.005 ≤ y ≤ 0.2; 0.0001 ≤ z ≤ 0.01; 0.001 ≤ c ≤ 0.1; 0.001 ≤ d ≤ 0.1; or compound of the following composition: Ln 2-X-Y-Z YbX ErY CeZ O2 S, where Ln - Y, La, Gd, 0 <x ≤ 0.2; 0.1 ≤ y ≤ 0.4; 0.0001 ≤ z ≤ 0.005; or compound of the following composition: Ln 2-X-Y-Z ErY CeZ O2 S; where Ln - Y, La, Gd, 0 < x ≤ 0.2; 0.1 ≤ y ≤ 0.4; 0.0001 ≤ z ≤ 0.005. Marking may be made by printing method, for instance offset method of printing. Method for identification of valuable document authenticity with all above mentioned criteria inherent in it includes detection of hidden protective marking on a valuable document by measurement and further analysis of dependency extent of stokes and anti-stokes luminescence strip intensity on density of excitation radiation capacity.
EFFECT: improved level of valuable document protection.
SUBSTANCE: invention relates to liquid crystal materials and can be used as flawless luminescent optical media in electro-optical and magneto-optical devices. A lyotropic liquid crystal composition is described, which contains oxyethylated surface active substance in form of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis[29-hydroxy(3,6,9,12,15,18,21,24,27-oxanonacosaneoxy]-pentacyclo[19.3.-1.13,7.19,13.115,19]octacosa-1(25)3,5,7(28)9,11,13(27)15,17,19(26)21,13-dodecane, hexahydrate of europium nitrate and solvent in form of ethanol. Components of the composition are in the following ratio, wt %: said oxyethylated surface active substance - 55 to 79, hexahydrate of europium nitrate - 12 to 35, ethanol - 5 to 33.
EFFECT: production of lyotropic liquid crystal composition, with twelve times more luminescence efficiency and double the mean life of luminescent glow.
1 cl, 5 dwg, 1 tbl, 4 ex
FIELD: materials useful in agriculture, medicine, biotechnology, light industry.
SUBSTANCE: claimed material includes matrix and at least one light-converting compound, namely luminophor converting UV radiation into radiation of other colors and has particle size from 0.3 to 0.8 mum and general formula of Mex aAy bRz c, wherein Me is yttrium, lanthanum, cerium, praseodium, europium, gadolinium, dysprosium, erbium, ytterbium, aluminum, bismuth, manganese, calcium, strontium, barium, zinc, cesium; A is cerium, praseodium, europium, gadolinium, dysprosium, erbium, ytterbium, aluminum, indium and/or combination thereof; R is oxygen, sulfur, phosphorus, boron, vanadium, titanium, aluminum, indium and/or combination thereof; a, b and c represent charge of Me, A or R ions, respectively; x >=1; 1.0>=y>=0.0001; z corresponds ax+by=cz. Aldo disclosed is composition for material production containing abovementioned light-converting compound in amount of 0.001-10.0; and balance - matrix-forming component, e.g. polymer, fiber, varnish- or adhesive-forming agent.
EFFECT: conversion of UV irradiation of increased effectiveness; increased plant productivity.
16 cl, 21 ex
SUBSTANCE: invention can be used in polishing glass or materials similar to glass. An inorganic cerium salt or cerium hydroxide containing cerium in amount of 50-100% of the total content of oxides of rare-earth elements is suspended in an aqueous medium. The obtained aqueous suspension is treated with an acid or a salt of an acid selected from a group comprising HF, H3PO4 and H2SO4. Solid particles are separated from the aqueous medium, annealed at temperature 750-1200°C and ground to 0.5-5.0 mcm grains. The oxide of the rare-earth element added to the suspension can be a precursor compound, e.g. a hydroxide, chloride or nitrate of a rare-earth element. The polishing composition based on the obtained cerium dioxide contains the following in wt %:fluoride 0.5-14; phosphorus in terms of P2O5 0.5-5; sulphur in terms of SO3 0.3-5.
EFFECT: invention enables to obtain a polishing compound with high stock removal rate.
8 cl, 15 dwg, 8 ex
FIELD: process engineering.
SUBSTANCE: invention relates to hydrometallurgy of rare-earth metals, namely, to production of nano-sized powders of lanthanide oxides. Proposed method comprises precipitating lanthanide salt from nitrate solution with lanthanide oxide concentration of 30-50 g/l by solid ethanedioic acid with continuous addition of polyacrylamide in the form of solution with concentration of 0.005-0.015% in amount of 5.0-10.0 mg par 1.0 kg of lanthanide oxide, its separation, washing, drying at 60-65°C to residual humidity of 5-6%, calcination of obtained precipitate for 2.0-2.2 at 380-825°C depending upon properties of individual lanthanides.
EFFECT: lanthanide oxide with nano-sized particles and uniform distribution of sizes.
2 cl, 1 tbl, 1 ex
SUBSTANCE: invention can be used in photonics an inorganic synthesis as a catalytically active phase. A fluorinating compound is mixed with a solution containing barium salt and a salt of a rare-earth element to obtain a precipitate which is washed and dried. The solution mixed with the fluorinating compound contains barium ions and ions of a rare-earth element in molar ratio between 0.74:0.26 and 030:0.70, respectively.
EFFECT: invention enables to obtain phase-clean crystalline nanopowder with high concentration of rare-earth elements.
6 cl, 12 ex
SUBSTANCE: invention relates to technology of obtaining preparations of radioactive elements and can be used in analytical chemistry. The method of extracting radionuclides involves preparation of a working solution with 6≤pH≤8, total concentration of alpha-hydroxyisobutyric acid and salts thereof not more than 0.2 mol/l, bringing said working solution into contact with Chelex-100 sorbent, washing the sorbent with water and an acetic acid solution and elution of radionuclides with a solution of mineral acid with concentration of 0.03-0.1 mol/l.
EFFECT: high degree of separation and efficient purification of solutions from iron impurities.
2 cl, 4 tbl, 4 ex, 1 dwg
SUBSTANCE: absorbent thermostabilising material based on manganites of rare-earth elements is obtained in fine powder state. Manganites having phase transition dependency of radiation capacity on temperature and general formula A(1-X)BxMnO3 are used, where A is a rare-earth element, B is a substituting element, x ranges from 0.1 to 0.3. Compounds of corresponding elements are selected. Their concentration is selected to create the required composition. The compounds are mixed and heated until formation of a solid solution which is ground. Binder and solvent are added to the obtained material in the require proportion. The obtained mixture is stirred until obtaining a homogeneous mass and the applied onto the surface to be coated in a thin layer.
EFFECT: obtaining the desired product with high output.
3 cl, 1 dwg, 1 tbl
SUBSTANCE: invention can be used in production of magnetoresistors, materials or making magnetic recording heads and catalysts. An aqueous solution of a manganese salt and a rare-earth metal salt are prepared. A manganese compound is extracted from the obtained solution using a benzene solution containing trioctylamine, and the rare-earth metal compound is extracted using a benzene solution containing dipyridyl and acetyl acetone. The organic phases separated from the aqueous phases are mixed. An organic solvent is distilled at high temperature, after which the end product undergoes pyrolysis at 600-700 °C.
EFFECT: invention cuts on synthesis time and enables to obtain nanodispersed manganites of rare-earth metals with particle size of 20-100 nm and output of not less than 93%.
9 cl, 4 ex
SUBSTANCE: invention can be used in modern telecommunication and electronic devices. An initial aqueous solution of an iron salt with concentration of 0.05-0.10 mol/l in hydrochloric acid and an initial aqueous solution of a salt of a rare-earth metal with concentration of 0.05-0.10 mol/l are prepared. Iron is then extracted from the prepared solution using a benzene solution containing trialkylbenzylammonium chloride and the rare-earth metal is extracted using a benzene solution containing trialkylbenzylammonium chloride and acetylacetone. Aqueous phases of extracts of the iron and rare-earth metal obtained after separation are mixed to obtain the end product which is a type of orthoferrites with perovskite structure or garnet-type ferrites. The end product is extracted by distilling off an organic solvent at 60-100°C, after which the residue is hydrolysed at 600-700°C for 1-2 hours.
EFFECT: possibility of obtaining ferrites of rare-earth metals in form of nanodispersed powders in form of thin films on different substrates, reduced power consumption and duration of the process.
9 cl, 5 ex
SUBSTANCE: invention can be used for obtaining highly efficient magnetic-relaxation systems, namely water-soluble endometallofullerenes, applied in NMR tomography. Fullerene-containing soot is preliminarily extracted with solvent from the class of aromatic hydrocarbons or with carbon bisulphide. After that by selective extraction with dimethylformamide, solid highly beneficiated in gadolinium memallofullerenes mixture of empty fullerenes and gadolinium metallofullerenes Gd@C82 is obtained. Mixture is subjected to hydroxylation with hydrogen peroxide in one step obtaining Gd@C82(OH)x, where x is greater or equal 20, representing water-soluble hydroxylated mixture of empty fullerenes and metallofullerenes of gadolinium Gd@C82(OH)x. Obtained target product is isolated by sedimentation with excess of alcohol with further centrifugation and separated from hydrogen peroxide by washing with alcohol.
EFFECT: elaboration of efficient method of obtaining highly efficient magnetic-relaxation systems.
2 dwg, 1 ex
SUBSTANCE: invention can be used in chemical industry. Polychlorozincates of rare-earth elements are obtained by reacting chlorides of rare-earth elements with zinc chloride in diethyl ether medium and have general chemical formula nMCl3·ZnCl2·mEt2O, where M is a rare-earth element, n = 1-7, m = 1-13.
EFFECT: said chemical compounds are suitable for use as reagents in purifying oil products and natural gas from mercaptans and hydrogen sulphide, catalysts used in chloromethylation and alkylation of aromatic hydrocarbons and starting materials during production of metal hydrides.
SUBSTANCE: invention can be used in chemical engineering. A glass-carbon crucible is filled with a salt mixture containing 3.0-5.0 wt % anhydrous neodymium chloride, 7.0-11.00 wt % potassium fluoroborate, the rest - equimolar mixture of potassium chloride and sodium chloride. The crucible with the salt mixture is put into a quartz cell and held in an atmosphere of clean and dry argon until the salt mixture melts. Upon achieving working temperature, a tungsten cathode is lowered into the molten mass and electrolysis carried out at current density ranging from -0.1 to -1.0 A/cm2, electrolysis potential relative a glass-carbon comparison electrode ranging from -2.5 to -4.0 V at 700-800°C. Neodymium hexaboride powder is obtained at the cathode and has particle size of 40-180 nm.
EFFECT: invention lowers the process temperature to 700°C, reduces electric power consumption and enables to obtain the end product in pure form.
FIELD: ear-earth element compounds, in particular cerium dioxide.
SUBSTANCE: invention relates to simplified method for production of cerium dioxide having high specific surface useful for catalyst preparation. Method includes blending of (mass %) cerium carbonate 44-58; ammonia acetate 25-34; and water 14-25. Obtained mixture is dried in air and baked at 7000C.
EFFECT: simplified method for production of cerium dioxide.
2 cl, 1 tbl, 1 ex