Marking composition based on inorganic luminophors, method of metal products marking and metal product

FIELD: metallurgy.

SUBSTANCE: composition for marking of metal products produced by powder metallurgy method includes not more than 50% of wt % of luminophor and 50 wt % and more of binding-lubricating agent being fatty acid derivatives or powders of synthetic wax and/or paraffin. Marking of metal products by this composition consists in mixing of alloy metal powder with marking composition, which consists of at least one inorganic agent with property to provide luminescence at irradiation and binding-lubricating agent with subsequent pressing of obtained mixture and its sintering at temperature not exceeding 900°C.

EFFECT: possibility of products marking during their production by powder metallurgy method, simplifying marking technology and providing safety.

15 cl, 1 dwg, 8 ex

 

The invention relates to the field of chemistry, in particular to inorganic phosphors, in particular to compositions based on compounds of barium, strontium, magnesium, beryllium, yttrium, activated tin, titanium, manganese, europium, terbium, ytterbium, erbium oxides, oxysulfides, borates, yttrium, gadolinium activated by cerium, europium, terbium, praseodymium, neodium, ytterbium and erbium with a binder - stearic acid, stearates of zinc or aluminum or a mixture of derivatives of fatty acids with polyhydric phenols or a mixture of powders of synthetic wax and/or paraffin with the addition of polyhydric phenols.

This composition is suitable for protection of valuable material objects from fraud and theft by entering a hidden identification label. The invention relates to the marking of identified while carrying out special procedures manifestations, for detection of an object or setting data.

The group of the invention includes a composition for metal marking, labelling and metal products (hereinafter the product). In particular, the proposed marking can be applied in the whole volume of the product or part of product volume for the identification of coins, tokens, medals or component parts of the devices, assemblies and mechanisms or parts for them, for example, various transport is rest, home appliances manufactured by way of technology of powder metallurgy sintering temperature in an atmosphere of protective gas is not more than 900°C.

The most known ways of marking metals are the methods of processing of finished products during the application identification information on the surface of the product by pressing (stamping), electrochemical or laser exposure. These methods involve the use of special equipment for marking, complex, as they require a certain precision.

There is a method of marking metal products markers on metal, incorporating fluorescent components. However, this type of marking also involves marking only on the surface of the product and rather time-consuming, because the labeling of each product manually.

A known method of marking articles made by the method of layer-by-layer production, in which a three-dimensional object is manufactured using selective laser sintering or melting (WO 2010/057649, publ. 27.05.2010). The method involves mixing is used as the structural material of the metal powder, at least one salt one rare earth metal having the property to exhibit luminescence when irradiated by photons of the Noah wavelength outside the visible spectrum, and subsequent use of an energy source with concentrated energy processing for sintering or melting powder structural material.

Avoid dramatic changes in the characteristics of the source powder, the proportion of the marking of the component in the mixture does not exceed 20 weight percent, preferably between 0.1 and 10 weight percent.

The resulting homogeneous product does not show the presence of a marking when the illumination and observation in the visible range.

The detection of the marking is carried out by irradiation of the product in the UV, visible and PC ranges and observation in the visible and PCs bands. When this marking component can have one or more characteristic wavelengths of excitation or of radiation in different ranges.

Bulleted powder can be used as a structural material in the technology layer-by-layer production for manufacturing three-dimensional objects, for example, by the method of selective laser sintering or melting, the method of selective sintering or melting electron beam or infrared radiation, as well as SD-printing, in order to consolidate the material in the spray applied binder.

For analysis or identification label is sufficient to subject the product or its fragments ultraviolet or infrared radiation and reproduced radiation, install the manufacturer, date of manufacture, or from what source material was obtained the product.

Known to the persons marking has a number of advantages, however, when using this method, in contrast to the proposed, applied energy source with concentrated energy processing and small stain treatment that leads only to liquid-phase layer-by-layer sintering of a powder material, non-uniformity of the mechanical properties obtained after sintering material in the product's volume and change of geometrical parameters of the product, which does not allow to use this method for mass production of products by powder metallurgy using an energy source for bulk sintering the mass of the products.

Known technology implementation of protective characteristic in the form of inorganic phosphor in the base material, i.e. inclusion in the composition of the material (EN 2388054, publ. 27.04.2010).

According to known technology, the phosphor can be mixed with paper pulp in paper production process or can be added to the polymer material during the extrusion process. In order to increase the stability of the protective sign of thermal effects and increase the level of protection offered to use inorganic fluorescent substance embedded in a matrix, representing the crystal lattice of inorganic compounds, which contain rare earth elements. Also as a matrix can be used suitable organic is such a connection, such as polymethylmethacrylate, polyethylene, polyvinylbutyral, polystyrene, polypropylene, etc.

This technology provides a high degree of protection against forgery of documents, such as banknotes or checks, valuable documents made of paper/or polymers cards, such as identification or credit label to protect luxury items, etc. that use of the safety labels on this technical solution for the identification of metal products subjected to heat treatment at a temperature of about 900°C, it is impossible in view of the application of the material used matrix with a low ignition temperature.

Thus, in the prior art is not identified solutions that provide reliable marking of metal products in the manufacturing process by way of pressing followed by sintering at high temperatures taken in powder metallurgy.

Based on the foregoing, the present invention was based on the task of creating a method of marking metal products, manufactured by the method of powder metallurgy, to select an object or setting data.

The solution of the stated problem is a composition based inorganic phosphors for marking metal products obtained by the method of powder metallurgy, including Lum is nofor and binder-grease, which used derivatives of fatty acids or powders, synthetic wax and/or paraffin. The content of phosphor in the marking composition can be no more than 50 % by weight of the composition, and the binder in the amount of 50 wt.% and more.

As the marking of the component in the marking composition used inorganic phosphors based on phosphates, vanadates and/or silicates of barium, strontium, magnesium, beryllium, yttrium, activated tin, titanium, manganese, europium, terbium, ytterbium, erbium; oxides, oxysulfides, borates yttrium, gadolinium activated by cerium, europium, terbium, praseodymium, niobium, ytterbium and erbium.

Data of inorganic phosphors have thermal stability over 1000°C and do not interact with the powders of the metals used for the manufacture of products.

Examples illustrating the ranges of excitation and emission classes listed below:

- excitation in the UV range radiation in the visible range of the spectrum of these properties has a CA phosphate, activated Cs with the formula CA3(PO4)2:Cs.

- excitation in the UV range - radiation in the infrared range. These properties have oxysulfate neodymium-activated rare earth elements Nd2O2S:Cs ;

the excitation radiation is in the visible range of the spectrum radiation in the PC range. These properties of the neodymium oxide, activated rare earth elements Nd2O2:Cs;

- excitation in the IR rays - radiation in the infrared rays. These properties have antistoksova inorganic phosphors with the formula: Y2O2S; La2O2S; LaGaO3; Gd2O2S; Y2O3; Gd2O3; YbNa(WO4)2; LaGdO3; As activators are used manganese, silver, copper, rare earth elements.

As a binder-lubricant used surface-active substances (surfactants) on the basis of fatty acids, for example, powder, stearic acid and its derivatives (stearates of zinc, aluminum), and powders of synthetic wax and/or paraffin. With the help of this composition is achieved a uniform distribution of the marking of the component in the powder metal.

To remove the oxide film from the surface of the metal powder to improve volumetric sintering, glue-lubricating substance may optionally be added polyhydric phenols - dioxybenzone. Dioxybenzone are strong reducing agents and are able to clean the surface of metal powder from oxide.

As dioxybenzone used pyrocatechol, resorcinol, hydroquinone, pyragollole, oxyhydrogen, phloroglucin.

Another solution of the problem is the method of marking metal products, which consists in mixing a metal powder alloy with a marking composition comprising at least one inorganic substances (e.g. salt one rare earth metal), having the property to show the luminescence upon irradiation, and a binder-lubricant, which used derivatives of fatty acids or powders, synthetic wax and/or paraffin. And then pressing the resulting mixture, with subsequent sintering at a temperature not exceeding 900°C when using an energy source for bulk sintering the mass of the products.

In the method above, the marking composition.

For marks, used as a structural material, a metal powder according to the present invention, is mixed in a standard mixer with prior marking composition. The powders are mixed to achieve a homogeneous distribution of the powder of the indicator in the structural material.

The hidden element of protection is carried out by irradiation of a product or part of any radiation in the invisible spectral range and the subsequent registration of the radiation of the phosphor. Particularly preferably, the irradiation was carried out by radiation in the infrared region (IR, the near (far) infrared (NIR) or ultraviolet region (UV) spectrum.

Study design fragment products made with

the proposed method of labeling presented on Fig.1.

Fragment of a product obtained by sintering, is irradiated by a source of ultraviolet radiation. Emitted when this fluorescent radiation is recorded by the instrument (not shown) and/or visually.

The excitation of the phosphors used are produced by the radiation source with excitation frequency required to excite the applied phosphor.

The application of the method of registration of excitation depends on the applied phosphor.

To avoid changes in the characteristics of the alloy and disturbance regimes processing quantity of the marking substance compositions prepared for extrusion of the mixture must be less than or equal to 2 wt.% by weight of metal powder.

When implementing this method of manufacture allows marking multilayer and monastery manufactured by the method of powder metallurgy by heat treatment with sintering temperature not exceeding 900°C, which ensures their reliable identification for a long period.

The proposed method guarantees the safety of the identification properties independently from the conditions of storage and use of products. The method involves performing analysis with the aim of establishing a data object by its fragment.

The object of invention is also a piece of metal, obtained by pressing, powder metallurgy methods.

In the process of manufacturing a metal powder add pre-cooked marking composition consisting of at least one inorganic substances (e.g. salt one rare earth metal), having the property to show the luminescence upon irradiation, and a binder-lubricant, which used derivatives of fatty acids or powders, synthetic wax and/or paraffin.

The product according to the invention obtained by the above method of marking and marking composition.

The obtained product with a protective sign can be given any shape. As possible products can be cast coins, tokens, medals, etc.

You can get combined product consisting of a substrate made of monometallic or obtained by powder metallurgy methods, over which the applied art product made by the claimed technology. The term "applied" in this case implies a direct pripressovyvanie material with protective the m sign (artistic product) to the substrate surface and subsequent heat treatment at a temperature not exceeding 900°C.

The basics of the product (s) in the context of the present invention usually are component parts of devices, equipment, machinery or spare parts for them, for example, for devices such as vehicles, appliances. Thus, the obtained product may act as a marker for other products.

It must be emphasized that the features of dependent claims and the embodiments of the invention set forth in the description, can be used in combination or independently of each other and the object of independent claims independently.

As information confirming the implementation of the invention, the following examples.

Example 1

For marking metal products obtained by the method of powder metallurgy obtained marking composition comprising 40 wt.% phosphor and 60 wt.%. binder-lubricant.

As the phosphor used inorganic phosphors having thermal resistance above 1000°C and does not interact with the metal powders are used to manufacture products based on phosphates of barium activated by manganese.

As a binder-lubricant contains stearic acid.

Example 2. All as in example 1, but as the phosphor used reorgani the definition of connection on the basis of oxides of yttrium, activated by cerium and inorganic compounds on the basis of silicates of beryllium activated by terbium.

Example 3. All as in example 1, but as a binder-lubricant was used a mixture of derivatives of fatty acids with dioxybenzone. At the same time as dioxybenzone was used pyrocatechin.

Example 4. All as in example 1, but as a binder-lubricant was used a mixture of powders of synthetic wax and paraffin with dioxybenzone. At the same time as dioxybenzone was used resorcinol.

Example 5. All as in example 1, but as a binder-lubricant contains aluminum stearate or zinc mixed with hydroquinone or oxyhydroxides, respectively.

Example 6. All as in example 1, but as a binder-lubricant contains powders of synthetic wax or paraffin, mixed with pyragollole or phloroglucinol, respectively.

Example 7

For marking metal - coin was prepared with the composition of strontium Vanadate activated with tin, and stearic acid. This composition was smashana with a metal powder alloy. Bad mixture was pressed and subjected to sintering.

Example 8

Upon receipt of the combined product to the surface of a substrate made of monometallic method is the nternet pripressovyvanie applied art products, obtained by mixing a previously prepared mixture of phosphate and magnesium powders, synthetic wax and paraffin powder metal alloy. Then the combined product was subjected to heat treatment at a temperature not exceeding 900°C.

The proposed method of marking metal products obtained by the method of powder metallurgy, using published marking composition provides reliable marking, well maintained for a long time, allowing the identification not only of the whole product, but their parts. Technology marking is simple, requiring no additional processing of finished products, and is also harmless, because without the direct involvement of the person and his contact with harmful substances.

1. Composition based inorganic phosphors for marking metal products obtained by the method of powder metallurgy, comprising the phosphor, characterized in that it contains a binder-lubricant substance, which used derivatives of fatty acids or powders, synthetic wax and/or paraffin in the following ratio, wt.%:

the phosphornot more than 50
binder-grease50 or more.

2. Composition for marking metal products according to claim 1, characterized in that the phosphor contains at least one inorganic compound having a thermal resistance above 1000°C and does not interact with the powders of the metals used for the manufacture of products.

3. The composition according to claim 1, characterized in that the phosphor contains inorganic compounds based on phosphates, vanadates and/or silicates of barium, strontium, magnesium, beryllium, yttrium, activated tin, titanium, manganese, europium, terbium, ytterbium, erbium; oxides, oxysulfides, borates, yttrium, gadolinium activated by cerium, europium, terbium, praseodymium, neodium, ytterbium and erbium.

4. The composition according to claim 1, characterized in that the binder-lubricant contains stearic acid and its derivatives, such as the stearates of zinc or aluminum.

5. The composition according to claim 1, characterized in that the binder-lubricant substance is a mixture of derivatives of fatty acids with polyhydric phenols.

6. The composition according to claim 1, characterized in that the binder-lubricant substance is a mixture of powders of synthetic wax and/or paraffin with the addition of polyhydric phenols.

7. The composition is according to claim 5 or 6, characterized in that as polyhydric phenols contains dioxybenzone.

8. The composition according to claim 7, characterized in that as dioxybenzone used pyrocatechol, resorcinol, hydroquinone, pyragollole, oxyhydrogen, phloroglucin.

9. Composition for marking metal products according to claim 1, characterized in that the phosphor comprises compounds, emitting a single wavelength, or different connections, characterized by a different wavelength or wavelength range.

10. The method of marking metal articles, which consists in mixing a metal powder alloy with a marking composition, characterized in that the alloy powder is mixed with pre-cooked marking composition consisting of at least one inorganic substance having the property to exhibit luminescence when irradiated, and a binder-lubricant, which used derivatives of fatty acids or powders, synthetic wax and/or paraffin, followed by molding the mixture and sintering at a temperature not exceeding 900°C.

11. Piece of metal, obtained by pressing on the technology of powder metallurgy, characterized in that in the process of manufacturing a metal powder add pre-cooked Mar yuushuu composition according to claims 1-9.

12. The product according to claim 11, characterized in that obtained using the method of marking according to claim 10.

13. The product according to claim 11, characterized in that the combined and consists of a substrate made of monometallic or obtained by powder metallurgy methods, on top of which is marked artistic product obtained by the method according to claim 10.

14. The product according to item 13, characterized in that the artistic product caused direct repressiveness to the substrate surface and subsequent heat treatment at a temperature not exceeding 900°C.

15. The product according to item 13, wherein the substrate can be an integral part of the devices, assemblies or mechanisms or parts for them (different vehicles, household appliances and so on).



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to light-converting coating material for greenhouses and a composition for producing said material and can be used in agriculture and plant growing to grow plants in protected ground. The light-converting coating material consists of an optically transparent base and a light-converting composition which is deposited on the base and consists of a polymer matrix and a phosphor. The phosphor is semiconductor nanocrystals which are made of a semiconductor core and at least one semiconductor cladding such that the particle size of the nanocrystals in the light-converting composition ranges from 1 nm to 100 nm.

EFFECT: present invention considerably increases crop yield by converting part of UV radiation into the orange-red spectral range.

17 cl, 3 dwg, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to novel complexes of rare-earth elements, which can be used as active layers of organic light-emitting diodes, optical-electronic devices as well as fluorescent labels and markers. Disclosed is a luminescent complex of rare-earth elements of formula [Ln(L1)3L2] (I), where Ln is an ion of a trivalent rare-earth element, L1 is a diketonate ligand - a derivative of 3-polyfluoroalkyl-1-pyrazolyl-1,3-propanediol of formula (II), where RF is CH2F, CHF2, CF3, fluorinated alkyl, cycloalkyl or aryl, L2 is an auxiliary bidentate N, P or O-containing ligand. A method of producing compound (I) is also disclosed.

EFFECT: invention enables to obtain novel compounds (I) with high luminescence intensity compared to their non-fluorinated counterparts, and also enables to vary in a wide range such process parameters of compounds (I) as thermal stability, film-forming capacity, solubility and volatility in a vacuum, which are necessary for use in optical-electronic devices.

2 cl, 3 dwg, 12 ex

FIELD: physics.

SUBSTANCE: invention relates to a method of predicting photostability of colloidal semiconductor quantum dots with a nucleus-shell structure in an oxygen-containing medium, involving measuring kinetics of a photoluminescent signal of quantum dots for the tested and reference batches, determining for said batches values of a parameter which characterises the rate of decay of the photoluminescent signal over time. The rate is characterised by that quantum dots are pre-deposited on the surface of a solid substrate, and said measurement is carried out in a gaseous medium containing ozone with fixed concentration. Further, a higher level of photostability of the tested batch relative the reference batch is predicted with the ratio of values of said parameter corresponding to decrease in the rate of decay of the photoluminescent signal for the tested batch relative the reference batch and vice versa.

EFFECT: use of the present method does not require use special expensive microscopic equipment, powerful photoexcitation sources, additional photoexcitation sources and liquid or toxic chemicals.

3 cl, 1 dwg

Luminous body // 2445340

FIELD: physics.

SUBSTANCE: inorganic composition for producing electroluminescent material contains the following, pts.wt: 80-95 semiconductor compound consisting of group II and group VI elements; 0.001-3 iridium source or a combination of an iridium source and at least one source of metal other than iridium; 3-9 activator. To obtain electroluminescent material, the inorganic composition is subjected to an explosion using a propellant and/or blasting explosive in a sealed vessel followed by thermal treatment. The obtained electroluminescent material is used as a light-emitting layer between electrodes of an inorganic electroluminescent device whose brightness when excited with direct current is equal to or higher than 10000 cd/m2.

EFFECT: invention not only increases brightness but also prolongs the service life of the light-emitter.

12 cl, 5 dwg, 2 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: nanocomposite has a thermoplastic copolymer as a polymer matrix. At the step of preparing a composition or moulding the article, nanosized silicon is added to the copolymer as a light-converging component in amount of 0.001-1.5 wt % with particle size 1-5 nm, said component containing silicon dioxide in the surface layer of the core.

EFFECT: invention enables to form a nanocomposite having bright and sustained photoluminescence in the range from 750 to 500 nm, which is retained at high temperatures.

4 dwg, 5 ex

FIELD: physics.

SUBSTANCE: luminophore consists of crystal lattice of seed material with activating additives representing ions Eu2+, Tb3+ and/or Eu3+. Said seed material, when excited by high-energy excitation radiation, absorbs at least portion of said excitation radiation to, then, emit radiation with lower power. Note here that seed material lattice represents carbide-silicon nitride compounds not containing cerium as activating additive. Invention covers also luminophore with its seed material lattice represents compound with general formula Ln2Si4N6C, where Ln stands for element or mix of elements selected from group including yttrium, lanthanum, gadolinium and lutetium.

EFFECT: reduced tendency to luminescence quenching, higher temperature and chemical stability.

11 cl, 6 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to scintillation materials, specifically to two-layer fibrous scintillators for detecting slow neutrons and suitable for making scintillation fibrous detectors for radiation environmental monitoring, for monitoring space and industrial neutron background, for making systems for monitoring nuclear fuel and articles made from fissile materials, as well as for making antiterrorist radiation monitoring systems. The method of making two-layer fibrous scintillator involves heating core and cladding material at 180-190°C, pressure 150-180 kg/cm2 and then moulding the two-layer structure of the fibre through extrusion at a rate of 1.0-1.5 m/h. The material of the core of the scintillator contains the following in wt %: silver chloride 5.0-10.0; silver bromide 87.5-85.0; silver iodide 0.5-1.0; thallium (I) iodide 7.0-4.0, and the cladding material of the scintillator contains the following in wt %: silver chloride 18.0-20.0; silver bromide 80.5-79.4; silver iodide 0.1-0.5; thallium (I) iodide 0.5-1.0. The invention enables to obtain a new generation of flexible long two-layer fibrous scintillators with fluorescence spectrum maximum between 600 nm and 800 nm.

EFFECT: two-layer fibre structure enables transmission of scintillation radiation with virtually no loss owing to the effect of total internal reflection of radiation in the core of the fibre at the core-cladding boundary surface.

3 ex

Valuable document // 2407771

FIELD: information technology.

SUBSTANCE: counterfeit protected paper, protective element or valuable document contains a luminophor of general formula XZO4, in which X denotes YbLacPreNdfErnYbpFe(III)v, where b + c + e + f + n + p + v=1, and each of indices b, c, e, f, n, p, v assumes a value between 0 and 1, where either n≠0 and p≠0, or f≠0 and p≠0, or n≠0and f≠0, Z denotes NbzaTazbPzd, where za + zb + zd = 1, and each of the indices za, zb and zd assumes a value between 0 and 1. The luminophor can be added to printing ink, can be deposited on a surface or entered into the volume of the valuable document and can be embedded into the composition of melange fibres, protective threads. The valuable document can be made from paper or a polymer, the protective element can be made in form of a strip, tape, thread, plate, melange fibre or label. To authenticate the document, duration of luminescence or wavelength and/or number and/or form and/or intensity of the line of the radiation emitted by the luminophors and/or the band exciting radiation is analysed. The lines of radiation emitted by the luminophors and/or bands of exciting radiation form a code.

EFFECT: increase in number of luminophors used during authentication.

48 cl, 1 dwg, 2 tbl, 7 ex

FIELD: physics.

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: MexaAybRzc , 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

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, in particular to one-component UV-radiation phosphor that can be used in fluorescent lamps for skin sunburn and feature common composition (Y1-x-y-zLaxGdyCez )PO4, where x varies from 0.001 to 0.98, y varies from 0 to 0.1, z varies from 0.01 to 0.2, while x+y+z<1. When excited by 254 nm-radiation, phosphor radiates in UV A and B ranges. UV A-to-B ratio can be varied by adjusting relative quantities of Y and La.

EFFECT: one-component UV-radiation phosphor with wide UV A-to-B ratio range.

17 cl, 3 dwg, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: aqueous solution of quantum dots based on cadmium selenide coated with mercapto acids is stabilised by adding sodium sulphite until achieving its concentration of 0.02-0.2 mol/l in the solution.

EFFECT: high stability of aqueous solution of quantum dots while preserving luminescence brightness, hydrodynamic diameter and active groups of the quantum dots.

2 dwg

FIELD: chemistry.

SUBSTANCE: polymer nanoparticles contain a medium for photon up-conversion and a stabilising agent. Said medium contains a polymer matrix having two organic components distributed therein. The first component is capable of absorbing light at a first wavelength in the range w≤λ1≤x and acts as a sensitiser in said medium. The second component is capable of emitting light at a second wavelength in the range y≤λ2≤z, where λ2≤λ1, and acts as an emitting component in said medium. The stabilising agent is selected from hydrophilic or amphiphilic polymers.

EFFECT: polymer nanoparticles have versatility with respect to the radiation wavelengths, both incident and emitted, the size and surface properties of said nanoparticles can be controlled, thereby enabling photon up-conversion for opto-electronic devices.

15 cl, 13 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: polymer luminescent composition for obtaining white light excited by a blue light-emitting diode contains the following components, pts. wt: transparent polymer 100; photoluminescent phosphor based on garnet Y3Al5O12:Ce or Gd3Al5O12:Ce, or based on a mixture of said compounds 1.5-5.0; polyethylene wax in form of powder with particle size of 18-30 mcm 0.1-0.7; stabiliser 0.2-1.0. The transparent polymer used can be polycarbonate, polystyrene or a copolymer of styrene with acrylonitrile and butadiene. The stabiliser can be a compound from a group of sterically hindered phosphites.

EFFECT: Invention enables to obtain a protective lighting composition which provides low colour temperature, improved colour coordinates.

5 cl, 1 dwg, 2 tbl

FIELD: physics.

SUBSTANCE: invention relates to synthesis of nucleus- and nucleus-shell type semiconductor quantum dots through colloidal synthesis, which can be used in making different luminescent materials, as well as a base for making subminiature light-emitting diodes, white light sources, single-electron transistors, non-linear optical devices, photodetector and photovoltaic devices. The method for synthesis of semiconductor quantum dots based on chalcogenides of group II or group IV metals involves synthesis of nuclei of nanocrystals from a precursor containing chalcogen, and a precursor containing group II or IV metals, using an organic solvent and a surface modifier in form of (aminoalkyl)trialkoxysilanes. The nuclei are synthesised at constant temperature within the limits of 150 - 250°C for 15 s to 1 hour and the reaction mixture containing the nucleus of nanocrystals is further treated with UV light for 1-10 minutes and ultrasound for 5-15 minutes.

EFFECT: increase in photo-stability of semiconductor quantum dots to 34%, dispersibility in non-polar and polar solvents with retention and increase of quantum yield.

9 cl, 11 ex, 1 tbl, 6 dwg

FIELD: chemistry.

SUBSTANCE: method is described for obtaining luminescent nanoparticles of cadmium sulphide, stabilised with polymer matrices, involving growing nanoparticles of cadmium sulphide directly in polymer matrices. A polymer compound, chosen from a series which includes polystyrene-block-polyethylene oxide, polystyrene-block-polyethylene oxide, polystyrene-block-4-vinylpyridine or polyphenylene, is dissolved, anionic surfactant is added to the obtained mixture with subsequent addition of a compound which contains cadmium cations, and then a compound which contains sulphur anions, and after growing cadmium sulphide nanoparticles excess anionic surfactant is removed.

EFFECT: higher quality of luminescent cadmium sulphide nanoparticles, stabilised with polymer matrices, including brightness of light due to controlled process of growing nanoparticles and reduction of their agglomeration.

3 cl, 3 dwg, 5 ex

FIELD: electrical engineering; surface treatment of phosphor particles.

SUBSTANCE: proposed method that can be used for encapsulating phosphor particles to enhance their lighting and servicing parameters by producing continuous silicon dioxide film on their surfaces includes treatment of phosphor particles with 0.5 and 4 mass percent sols of polysilicic acid synthesized by hydrolyses of tetraethoxysilane in 0.6 - 0.8 mass percent aqueous solution of ammonia.

EFFECT: enhanced lighting parameters and service life of phosphor.

2 cl, 3 tbl

FIELD: luminescent materials.

SUBSTANCE: nitride coating precursor, in particular aluminum-, gallium-, or tin-containing metalloorganic nitride, is charged into reaction vessel 10a filled with electroluminescent phosphor, e.g. ZuS-Cu, and surrounded by heating means 30a using nitrogen as inert gas carrier. Precursor is passed through pipeline 32 open all over its length. Co-reagent, e.g. anhydrous ammonia is fed into lower part of vessel 12a through porous glass disk 12a. When vessel 10a is heated to 150-225°C, nitride coating precipitates on phosphor particles being in fluidized state. Phosphor bearing nonoxide coating is characterized by high brightness after 100 h use at high humidity.

EFFECT: enabled large-scale manufacture of phosphors.

3 cl, 2 dwg

The invention relates to methods of covert recording information, in particular to methods of recording using antistatisch phosphors, and is intended to enhance the protection of various printed materials (documents, labels, stamps, inscriptions on products and packaging and so forth) executed by way of flexography, from fakes
Recording medium // 2492058

FIELD: printing.

SUBSTANCE: invention relates to a recording medium. The recording medium comprises a substrate and a layer that receives ink deposited on the substrate, in which the arithmetic mean roughness Ra of the outer surface of the recording medium as specified in JIS B 0601:2001, is 1.1 mcm or more and 2.5 mcm or less, and the asymmetry Rsk of the roughness curve of the outer surface of the recording medium as specified in JIS B 0601:2001, is 0.1 or less.

EFFECT: invention provides creation of a recording medium capable of suppression of occurrence of ink acceptance, reduction of visibility of scratches on the outermost surface of the recording medium, and suppression of occurrence of the speckled structure on the image during recording.

7 cl, 12 ex, 2 tbl

Up!