Yttrium ortho-phosphate-based infrared luminophore and synthesis method thereof

FIELD: chemistry.

SUBSTANCE: invention can be used to produce infrared luminophores, having radiation in the near infrared range (0.80-0.82 and 0.90-0.98 mcm) when excited. The yttrium ortho-phosphate-based infrared luminophore can be used to make hidden, machine-readable luminescent labels used to protect bond payer, as well as active medium for lasers which generate in the (1.5-1.6 mcm) spectral range which is safe for the human eye. The yttrium ortho-phosphate-based infrared luminophore contains only Yb3+, Er3+, Ce3+ ions as optically active ions in a cationic subarray and has chemical composition corresponding to the following empirical formula: Y1-x-y-zYbxEryCezPO4, where 0.1≤x≤0.88; 0.0001≤y≤0.1; 1*10-4≤z≤1*10-2. The luminophore has simultaneously high intensity of Stokes infrared luminescence in the 1.5-1.6 mcm range and minimum anti-Stokes luminescence. The method of producing the infrared luminophore involves thermal treatment of a mixture of oxides of yttrium, ytterbium, erbium and cerium, a phosphorus-containing compound and a mineralising agent in air, wherein the phosphorus-containing compound used is disubstituted ammonium phosphate, and the mineralising agent used is carbonates of alkali metals: Li, Na and K, and thermal treatment is carried out at temperature 900-1250°C, which, depending on the concentration of the mineralising agent and calcination conditions, ensures reproducible production of well-formed microcrystals of the yttriuim ortho-phosphate-based infrared luminophore with average particle size from 2 to 18 mcm.

EFFECT: method is easily producible and high-efficient.

2 cl, 4 dwg, 11 ex

 

Scope

The invention relates to the chemical industry and can be used for the production of infrared phosphors with when excited by radiation in the near IR range (0,80-of 0.82 and 0.90-0.98 mm) high intensity Stokes IR luminescence in the region of 1.5 to 1.6 μm) and the minimum anti-Stokes luminescence.

Infrared phosphor-based yttrium orthophosphate can be used to create a hidden machine-readable fluorescent labels used for protection of securities, as well as the active medium for lasers generating in a safe for the human eye spectral range of 1.5-1.6 ám).

The purpose of the invention

The claimed invention is directed to solving complex problems, which consists in obtaining new members infrared phosphor-based yttrium orthophosphate with high intensity Stokes IR luminescence in the region of 1.5 to 1.6 μm and the minimum visible anti-Stokes luminescence, and a new method of its production, providing reproducible getting a new infrared phosphor with improved lighting options and a well-shaped micro-crystals with an average particle size of from 2 to 18 microns.

The urgency and complexity of assigned complex tasks derived from the factors the authors of this invention, a generalized analysis of the known patent data phosphors based on orthophosphate yttrium and REE, which in chronological order below.

The existing level

Known phosphor-based orthophosphate yttrium and rare earth elements (REE), the chemical composition of which is described by the following chemical formula (European patent EP NO. A, CL 09 To 11/81 from 20.06.2001,):

LnxCeyTbzPO4where Ln is La, Gd, Y.

0≤x≥1; 0≤y≥1; 0≤z≤0,4; x+y+z=1.

The main area of application is the manufacture of fluorescent lamps. Under UV excitation in fluorescent lamps specified phosphor emits in the yellow-green region of the spectrum. The main disadvantages of this phosphor, excluding the possibility of its use as an IR phosphor, is that it does not absorb infrared radiation in the field of 0.80-0.84 and from 0.90-0.98 μm and not fluorescent in the field of 1.5 to 1.6 μm. These shortcomings are fundamentally physical in nature and due to the absence in the composition of the phosphor rare earth ions (RSI) as effectively absorb infrared radiation in the areas of 0.80-0.84 and from 0.90-0.98 μm, emitting in the region of 1.5-1.6 ám.

To improve lighting, operational and technological parameters of the above phosphor (LnxCeyTbzPO4) proposed to enter into his composition of Pb and Sn (U.S. Pat. Japan No. 1-165689 class. C 09 K 11/81 from 29.06.1989 g), Hf and Zr (U.S. Pat. Japan No. 57-187383, class C 09 K 11/475 from 18.11.1982 g), Sb (U.S. Pat. YAP the research Institute No. 62-089790, class. C 09 K 11/81 from 24.04.1987 G.) Li, B, S (U.S. Pat. Japan No. 9249879, class C 09 K 11/08 from 22.09.1997,), Tm, SiO2In2About3(U.S. Pat. Japan No. 3167289, class C 09 K 11/81 from 19.07.1991 g), Dy, Al2O3, SiO2, LiF (U.S. Pat. Japan No. 63-154785, class C 09 K 11/79 from 28.06.1988,), Li, Na, K, Rb, Cs, SiO2(U.S. Pat. U.S. No. 4629582, CL 252/301 .4R from 16.12.1986 g), N3IN3(U.S. Pat. U.S. No. 4764301, CL 252/3014R from 16.08.1988 year). These modified phosphors on the basis of REE orthophosphate have the same drawbacks, namely the lack of absorption of infrared radiation in the field of 0.90-0.98 μm and the effective Stokes PC-luminescence in the region of 1.5-1.6 ám.

Known non stoichiometric ytterbium phosphate with a low infrared reflectivity (U.S. patent No. 5911921, CL 252/584 from 15.06.1999,). The proposed material is intended for use as an infrared component in invisible ink used for printing the information of the strips, such as a bar code. The advantage of this material is the high absorption of infrared radiation from the area of 0.90-0.98 μm. The main disadvantage is the lack of Stokes IR luminescence in the region of 1.5 to 1.6 μm when excited by IR radiation 0,80-of 0.82 and 0.90-0.98 μm. This disadvantage is also fundamental in nature and due to the fact that the proposed material is completely absent rare earth ions emitting in the region of 1.5-1.6 ám.

Most b is izkuyu to the technical essence and the achieved result to the claimed solution is, selected as a prototype of the phosphor based on yttrium orthophosphate, the chemical composition of which is described by the following formula (U.S. Pat. U.S. No. 5611958, class C 09 K 11/70 from 18.03.1997,):

LnxB1-xPO4

where Ln represents at least one element from the group consisting of Nd, Yb, Er;

In represents at least one element from the group consisting of Y, La, Gd, Bi, CE, Lu, In, Pr and Tb;

x varies in the range from 0.01 to 0.99.

The proposed infrared phosphor-based yttrium orthophosphate is designed to protect securities. The advantages of the infrared phosphor is the possibility of obtaining under excitation of infrared radiation to 0.80-0.98 μm selective bands of radiation in the region of 0.98 and 1.1 and 1.5-1.6 ám, which can be used as a protective characteristics of securities. The method of obtaining this phosphor based on annealed in air of REE oxides, ammonium phosphate one-deputizing (NH4H2PO4) and lithium phosphate (LiH2P2O4) at a temperature of 700-850°C for several hours. After annealing the mixture is cooled, washed successively 1M aqueous solution of nitric acid and then with distilled water. The washed phosphor is dried and sieved. Thus obtained phosphor is a fine phosphor with neoisolationist IR luminescence in the region of 1.5-1.6 ám (see table) and observed in the electron microscope is the agglomerates of ill-formed microcrystals in the range of 0.1-2 μm. Electron-microscopic image of particles of the phosphor LnxB1-xPO4received the prototype, illustrated in figure 1.

The main disadvantages of the proposed prototype infrared phosphor-based yttrium orthophosphate and method thereof that prevent its use for protection of securities are as follows:

- low when excited by laser radiation in the range of 0.80-of 0.82 and 0.90-0.98 μm, the intensity of the Stokes IR luminescence in the region of 1.5 to 1.6 μm, which requires a significant increase in consumption of this phosphor in the manufacture of protective label on the securities;

- presence upon excitation by laser radiation in the range of 0.80-of 0.82 and 0.90-0.98 μm noticeable visible anti-Stokes luminescence completely eliminates the possibility of getting on the basis of this phosphor hidden, invisible to the human eye when the IR excitation, the protective label on the valuable document;

the presence of agglomerates of poorly formed, defective microcrystals in the range of 0.1-2 μm worsen printing-technological properties of the fluorescent pastes and excludes the possibility of close-Packed protective coatings on the valuable document.

Because of the stated there was a problem creating a new IR phosphor-based yttrium orthophosphate, with the excitation laser radiation range of 0.80-of 0.82 and 0.90-0.98 μm at the same time as high intensity Stokes IR luminescence in the region of 1.5 to 1.6 μm, and the minimum visible anti-Stokes luminescence, and method thereof, capable of forming a well-formed microcrystals with an average size 2-18 μm. Consider the main causes of the above-mentioned disadvantages arising from them problematic moments and new technical solutions aimed at their solution, which will ultimately be to distinguish the claimed invention from the prototype, as well as to determine its novelty and inventive step.

We have conducted a theoretical analysis of the processes occurring during the irradiation of the phosphors of the infrared radiation range of 0.80-of 0.82 and 0.90-0.98 μm, allowed to establish that increase the intensity of Stokes luminescence infrared phosphor in the field of 1.5 to 1.6 μm, suppression of visible anti-Stokes luminescence and produce a well-formed microcrystals size 2-18 μm, at least four conditions.

The first condition provides maximum absorption by the phosphor IR radiation in the region of 0.90-0.98 μm. Spectroscopic analysis of the energy levels of rare earth ions has allowed to establish that this condition cf the di of all rare-earth ions (Pr 3+before Lu3+) best fits ion Yb3+. Fundamental physical point of view, the peculiarity of this ion is that its energy is only of the excited level2F5/2almost exactly corresponds to a wavelength of 0.98 μm, and the range of its absorption completely covers the range from 0.90 to 0.98 μm. It follows that absorb IR radiation in the region of 0.90-0.98 μm IR phosphor-based yttrium orthophosphate along with optically inactive ions Y3+must contain optical active ions Yb3+effectively absorb radiation in the region of 0.90-0.98 μm. In the proposed prototype of the IR phosphor-based orthophosphate yttrium and REE together with ions Y3+and Yb3+it is proposed to use other optically active ions REE (e.g., Nd3+), which absorb and emit in other areas of the spectrum. Joint participation ions Yb3+and Nd3+in the energy exchange energy excitation of infrared radiation leads to a decrease absorption ability of the IR phosphor in the field of 0.90-0.98 μm and, consequently, to reduce the intensity of Stokes IR luminescence in the region of 1.5-1.6 ám.

The second condition provides for the efficient transfer of excitation energy without significant loss of the rare earth ion having the ability to absorb the energy of the incident IR radiation in the region of 0.90-0.98 μm, i.e. from the ion Yb3+to ion activator. The fulfillment of this condition from a physical point of view, the most favorable of such option, when participating in the energy exchange ions are excited levels with close values of energy that allows you to transfer energy from the absorbing ion radiant without significant losses, namely resonant way. The analysis of the spectroscopic potential of rare earth ions has allowed to establish that such an option is implemented only in the case of pairs of ions Yb3+-Er3+for which the excited energy levels of the ion Yb3+F5/2and ion Er3+4I11/2practically coincide. It follows that to obtain the IR phosphor-based yttrium orthophosphate with high intensity Stokes luminescence in the region of 1.5-1.6 μm, you must use a pair of ions Yb3+-Er3+. In addition, the necessity of using ion Er3+dictated by the fact that they absorb infrared radiation in the field of 0.80-0.82 μm by means of an optical transition4I15/24I9/2and radiate in the desired spectral range of 1.5-1.6 ám in the radiative transitions from the sublevels of the excited state of4I13/2on the stark components of the ground level4I15/2. The scheme of the energy levels of the ions Yb3+and Er3+and) the sky transitions in the system of Yb 3+-Er3+figure 2 presents.

In the proposed prototype of the IR phosphor-based yttrium orthophosphate offered to use together with ions of Er3+other activators (Nd3+Pr3+In3+, Tb3+Bi3+). The application of the above ions results due to the competing processes of energy transfer only to the reduction of the Stokes IR luminescence of ions Er3+in the area of 1.5 to 1.6 μm and the emergence of new, unwanted bands of radiation in the visible and IR regions of the spectrum.

The third condition involves the reduction of colonization of the upper excited levels2H11/2,4S3/2and4F9/2ion Er3+associated with a visible anti-Stokes luminescence of IR phosphor-based orthophosphate yttrium and REE in the IR excitation. Analysis of the energy levels of rare earth ions has allowed to establish that one of the new technical solutions that provide significant suppression of visible anti-Stokes luminescence of IR phosphor-based yttrium orthophosphate activated by ions of Er3+when thermal excitation is the introduction of its constituent ions CE3+. As shown in figure 3 the scheme of optical transitions between ions Er3+and CE3+introduction in the cationic sublattice known phosphor-based yttrium orthophosphate, the act is vorovannogo Er 3+, ions CE3+in quantities of 1*10-4- 1*10-2can provide due to the proximity of the energy difference of the energy levels4S3/2-4F9/2,4F9/2-4I9/2and4I11/2-4I13/2ion Er3+and levels2F5/2-2F7/2ion CE3+the course of the following nonradiative cross-relaxation processes:

4I11/2(Er3+),2F5/2(CE3+) →4I13/2(Er3+),2F7/2(CE3+)

4S3/2(Er3+),2F5/2(CE3+) →2F9/2(Er3+),2F7/2(CE3+)

2F9/2(Er3+),2F5/2(CE3+) →4I9/2(Er3+),2F7/2(CE3+)

As a result of leaking above nonradiative processes should be observed:

- increase the intensity of Stokes IR luminescence in the region of 1.5-1.6 ám (transition4I13/2-4I15/2);

- reduction in the visible anti-Stokes luminescence (transitions2H11/24I15/2;4S3/24I15/2and4F9/24I15/2).

With the introduction of large quantities (x≥1*10-2ions CE3+part of the famous IR phosphor-based yttrium orthophosphate activated by ions of Er3+observed a suppression of the visible anti-Stokes luminescence, and Stokes IR luminescence in the region of 1.5 to 1.6 μm. It follows that to obtain the desired phosphor-based yttrium orthophosphate activated by ions of Er3+with minimal visible anti-Stokes luminescence and high intensity Stokes IR luminescence in the region of 1.5 to 1.6 μm, it must contain ions CE3+in strictly limited quantities. In the prototype IR phosphor-based yttrium orthophosphate proposed to use ions CE3+(0,01≤x≤0,99)that are not optimal, which leads to suppression as visible anti-Stokes luminescence and Stokes IR luminescence in the region of 1.5-1.6 ám.

The fourth condition involves achieving completeness achieve the formation of the IR phosphor-based yttrium orthophosphate, odnofaznogo received the product and receive a well-formed microcrystals phosphor size 2-18 μm.

In the proposed prototype method of obtaining infrared phosphor-based orthophosphate REE and yttrium provided by the calcination in air mixture of the oxides of rare earth, ammonium phosphate one-deputizing (NH4H2PO4), lithium phosphate one-deputizing (LiH2PO4) at a temperature of 700-850°C for 2 hours. Thus obtained IR phosphor is a fine IR luminescence of the three low-intensity Stokes IR luminescence in the region of 1.5 to 1.6 μm and observed by an electronic microscope consists of agglomerates of ill-formed microcrystals size of 0.1-2.0 μm (figure 1) in the following reasons:

1. As the main phosphate component in the mixture is ammonium phosphate one-deputizing (NH4H2PO4). The interaction of this compound with oxides of rare-earth elements and yttrium in the ignition of the charge leads, along with getting the main product of the reaction of orthophosphate REE, to the formation of several side phases is difficult soluble metaphosphates and polyphosphates REE, significantly impairs the intensity of the Stokes IR luminescence in the region of 1.5-1.6 ám.

2. As the second phosphorus-containing compounds, which also fulfills the role of the mineralizer in the charge, lithium phosphate one-deputizing (LiH2PO4). The annealing oxides of rare-earth elements and yttrium in the melt of this compound during combustion of the mixture in the temperature range of 700-850°C does not result because of the low growth rate of the crystals to obtain a well-formed microcrystals size 2-18 μm.

One of the ways to obtain single-phase IR phosphor-based yttrium orthophosphate corresponding to the chemical composition of stoichiometric without side impurity phases, is the annealing mixture consisting of oxides of rare-earth elements and yttrium with ammonium phosphate duhsasana (NH4)2HPO4reaction:

2(NH4)2HPO4+ Ln2O3→ 2LnPO4+ 4NH3+ H2O

Otsu is as follows, to ensure complete reaction of the education LnPO4and obtain a single-phase product for the synthesis of IR phosphor-based yttrium orthophosphate must be used as the primary phosphate component mixture ammonium phosphate dvuhkamernyi (NH4)2HPO4.

It Is Known (Amorbach. "Introduction to the physical chemistry of crystallorophias". M., 1982)that the growth rate of the phosphor crystals in the melt of mineralizer depends on the specific solubility of the phosphor therein, the concentration of the mineralizer in the charge, the temperature and duration of calcination of the mixture. The most productive and the new technical solution, as shown by our experiments, is used as the mineralizer carbonates of alkali metals (Li, K, Na), which due to the higher density solubility of oxides of rare-earth elements and yttrium provide during combustion of the charge air in the temperature range of 900-1250°C reproducible getting a well-formed microcrystals IR phosphor-based yttrium orthophosphate with improved lighting options. Electron-MIKROSKOPIChESKOE image of the particles of the phosphor LnxYb1-xPO4according to the proposed technical solution is presented figure 4.

Summarizing the above data, it is possible to make a generalized conclusion, clopidogre in the prototype IR phosphor-based yttrium orthophosphate and how to obtain it are not responsible for the chemical composition, the type of activating ions and their concentration limits, degree of maturity, the size of the microcrystals and the presence of impurity phases is essential to achieve maximum absorption of infrared radiation in the field of 0,80-of 0.82 and 0.90-0.98 μm, the minimum visible anti-Stokes luminescence and high intensity Stokes IR luminescence in the region of 1.5 to 1.6 μm, and the reproduced produce a well-formed microcrystals size 2-18 μm.

Thus, in the process of creating claimed by the authors of the invention have been consistently describes the known patents on phosphors based on orthophosphate REE and yttrium identified their main disadvantages, the main reasons of their occurrence and arising issues, proposed and justified new technical solutions aimed at solving the problem of moments, which distinguish the claimed invention from the prototype, i.e. are hallmarks.

The technical result that can be achieved using the present invention is to decrease the visible anti-Stokes luminescence and increase Stokes IR luminescence in the region of 1.5 to 1.6 μm when excited by IR radiation range of 0.80-of 0.82 and 0.90 to 0.92 μm, and reproduced receiving well formed microcrystals in size from 2 to 18 microns f the th IR phosphor-based yttrium orthophosphate.

This technical result is achieved by the fact that it contains in the cation sublattice as optically active ions only ions Yb3+Er3+Ce3+and has a chemical composition corresponding to the following empirical formula:

Y1-x-y-zYbxEryCezPO4,

where 0.1≤x≤0,88; and 0.0001≤y≤0,1; and 0.0001≤z≤0.01,

and by the way it is received by calcination in air in the temperature range of 900-1250°C mixture consisting of oxides of yttrium, ytterbium, erbium and cerium ammonium phosphate dogsleding and mineralizer - carbonates of alkali metals, with the following proportions of the components of the charge, wt.%:

Y2O3=39,568-0,341

Yb2O3=7,666-52,374

Er2O3=0,00745-5,785

CeO2=0,006-0,52

IU2CO3=0,110-1,284, where Me=Li, Na, K

(NH4)2HPO4= rest

In relation to the prototype of the claimed invention has the following distinctive features:

1. As the optically active ions in the cation sublattice of the inventive phosphor used only Yb3+Er3+Ce3+;

2. The content of Yb3+in the present phosphor varies in the range of 0.1≤x≤0,88;

3. The content of Er3+in the present phosphor varies in the range of 0.0001≤y≤0,1;

4. The content of ions CE3+in the present phosphor to change aetsa in the range of 0.0001≤z≤0,01;

5. As the phosphorus-containing compound is ammonium phosphate dvuhkamernyi;

6. As mineralizer used carbonates of alkali metals Li, Na, K;

7. The temperature of ignition of the charge varies from 900 to 1250°C.

The invention

The essence of the invention lies in the fact that the technical result is achieved with the use of the totality of the distinguishing characteristics:

1. Introduction in the cationic sublattice of the inventive IR phosphor of the above quantities ions Yb3+provides maximum absorption of infrared radiation in the range of 0.90-0.98 μm and efficient transfer of the absorbed energy resonance by Jonah Er3+.

2. Introduction in the cationic sublattice of the inventive IR phosphor of the above quantities ions Er3+ensures the absorption of infrared radiation in the range of 0.80-of 0.82 μm and further conversion of the absorbed energy in Stokes IR luminescence in the region of 1.5 to 1.6 μm, and the conversion obtained from ions Yb3+energy in Stokes IR luminescence in the region of 1.5-1.6 ám.

3. Introduction in the cationic sublattice of the inventive IR phosphor of the above quantities ions CE3+provides due to the above cross-relaxation processes reduction in the visible anti-Stokes luminescence and Velicina Stokes IR luminescence in the region of 1.5-1.6 ám.

4. Used as phosphorus-containing compounds in the charge of the ammonium phosphate dogsleding provides obtaining single phase phosphor without impurity phases.

5. Use as a mineralizer carbonates of alkali metals results in a faster growth of microcrystals and reproducible getting a well-formed microcrystals of the inventive IR phosphor with improved lighting options.

6. Changing the temperature of the annealing mixture in the temperature range of 900-1250°C can be directed to adjust the size of the microcrystals of the inventive IR phosphor in the range of 2 to 18 microns.

Specified in the claims limits of ions of yttrium, erbium and cerium, forming part of the inventive IR phosphor was determined experimentally on the basis of the minimum visible anti-Stokes luminescence and high intensity Stokes IR luminescence in the region of 1.5-1.6 ám.

Specified in the description of the invention, the quantitative ratio of the components of the charge determined experimentally, based on the conditions of obtaining the claimed infrared phosphor with improved lighting parameters and the required granulometric composition.

In this case a reduction of the content of ammonium phosphate dogsleding lesser, who eat 39,696% mass, results neodnorodnogo product with low intensity of Stokes IR luminescence in the region of 1.5 to 1.6 μm. The increase in the content of ammonium phosphate dogsleding to values larger than 52,624% mass results due to excess P2O5in the charge to a strong sintering product and the formation of impurity phases.

The decreases in the amount of mineralizer - carbonates of alkali metals in the charge to values smaller than 0,110% mass leads to a decrease in the rate of growth of microcrystals and education ill-formed microcrystals with low intensity infrared luminescence in the region of 1.5 to 1.6 μm. The increase in the content of mineralizer - carbonates of alkali metals to a value greater than 1,284% mass results strongly sintered agglomerates larger than 10-20 microns.

Reducing the temperature of the annealing mixture to values smaller than those indicated in the claims, leads to the formation of fine phosphor with low intensity infrared luminescence in the region of 1.5 to 1.6 μm. Increasing the temperature of annealing to a value greater than specified in the claims, leads to the formation of highly sintered agglomerates larger than 10-20 microns.

Therefore, between the features and the technical result of the claimed invention include p is icine-effect relationship, because these symptoms are only collectively achieve the desired technical result.

According to the authors the information set of essential features that characterize the essence of the claimed invention, is not known in what has been achieved to date technology that allows to make a conclusion about conformity of the invention, the criterion of "novelty".

According to the authors, the essence of the invention not obvious to experts from the achieved level of technology, because of him not detected above the effect on the resulting technical result is a new property of an object is the totality of characteristics that differ from the prototype of the claimed invention, which allows to make a conclusion about its compliance with the criterion of "inventive step".

The set of essential features that characterize the invention, can be reused in the production of IR phosphors based on orthophosphate yttrium and REE, which allows to make a conclusion about conformity of the invention, the criterion of "industrial novelty."

The inventive IR phosphor using the entire set of distinctive features is described by the examples.

Example 1 (prototype)

Prepare a mixture of the following composition: Y2O3to 8.3 g (9.95 wt.%), Yb2O3- 9,9 g (up 11,86 wt.%), Ersub> 2O3- 0.24 g (0.29 wt.%), LiH2PO4- 65 g (77.9 wt.%). For this purpose the components of the mixture are thoroughly mixed in a porcelain mortar. The resulting mixture is transferred into alongby the crucible, cover, and calcined in air at a temperature of 750°C for 2 hours. After cooling, the calcined mixture is washed successively with hot distilled water, 1M aqueous solution of nitric acid and again with hot distilled water until pH 7. The washed phosphor is filtered off, dried at a temperature of 100-110°C and sieved through sieve No. 76. The chemical composition of the obtained IR phosphor-based yttrium orthophosphate corresponds to the chemical formula: Y0.590Yb0.4Er0.01PO4. The relative intensity of Stokes PC-luminescence of the phosphor in the region of 1.5-1.6 ám at excitation lasers 0,810 and 0,940 μm is 100%. The relative brightness of the visible anti-Stokes luminescence of the phosphor upon excitation by laser 0,940 μm is 100%. The average size of micro-crystals under the microscope is 0.9 μm.

Example 2 (prototype)

Prepare a mixture of the following composition: Y2O3and 9.8 g (11.9 wt.%), Yb2O3to 7.4 g (8,99 wt.%), Er2O3- 0.12 g (0.15 wt.%), LiH2PO4- 65 g (78,96 wt.%). For this purpose the components of the mixture are thoroughly mixed in a porcelain mortar. Further technological about what erali, as in example 1. The chemical composition of the phosphor corresponds to the following empirical formula: Y0.695Yb0.3Er0.005PO4. The relative intensity of Stokes IR luminescence of the phosphor upon excitation by lasers 0,810 and 0,940 μm is 91 and 89%, respectively. The relative brightness of the visible anti-Stokes luminescence of 95%. The average size of micro-crystals under the microscope of 0.9 μm.

Example 3

Prepare a mixture of the following composition: Y2O3- 133,32 g (23,26 wt.%), Yb2O3- 157,6 g (27.5 wt.%), Er2O3- a 3.83 g (0.67 wt.%), SEO2- 0.035 g (0,006 wt.%), (NH4)2HPO4- 273,24 g (47,664 wt.%), Li2CO3- 5,18 g (0.9 wt.%). For this purpose the components of the mixture are thoroughly mixed in a porcelain mill with balls. The resulting mixture is loaded into quartz crucibles with a capacity of 1.0 liter or in a quartz cuvette with a capacity of 6 l, cover and calcined in air at a temperature of 1250°C for 2 hours. After cooling, the calcined mixture is grinded, washed with hot distilled water to pH 6-7. The washed phosphor was filtered, dried at a temperature of 100-110°C and sieved through sieve No. 76. The chemical composition of the obtained IR phosphor - Ybfor 0.4Er0,01Y0,5899Ce0,0001PO4. The relative intensity of Stokes IR luminescence in the region of 1.5-1.6 ám obtained IR-luminotherapy excitation lasers 0,810 and 0,940 μm is 342 and 427%, respectively. The relative brightness of the visible anti-Stokes luminescence of 91%. The average size of micro-crystals under the microscope 8 microns.

Example 4

Prepare a mixture of the following composition: Y2O3- 132,775 g (23,152 wt.%), Yb2O3- 157,6 g (27,484 wt.%), Er2O3- a 3.83 g (0,668 wt.%), SEO2is 0.86 g (0,145 wt.%), (NH4)2HPO4, 273,24 g (47,645 wt.%), Li2CO3- 5,18 g (0,906 wt.%). For this purpose the components of the mixture are thoroughly mixed in a porcelain mill with balls. Further technological operations as in example 3. The chemical composition of the obtained IR phosphor - Ybfor 0.4Er0,01Y0,5875Ce0,0025PO4. The relative intensity of Stokes IR luminescence in the region of 1.5 to 1.6 μm, the obtained IR phosphor upon excitation by lasers 0,810 and 0,940 μm is 356 and 440%, respectively. The relative brightness of the visible anti-Stokes luminescence of 84%. The average size of micro-crystals under the microscope 7 microns.

Example 5. Prepare a mixture of the following composition: Y2O3- 131,645 g (22,931 wt.%), Yb2O3- 157,6 g (27,452 wt.%), Er2O3- a 3.83 g (0,667 wt.%), CeO2- 2.58 g (0,449 wt.%), (NH4)2HPO4- 273,24 g (47,599 wt.%), Li2CO3- 5,18 g (0,902 wt.%). For this purpose the components of the mixture are thoroughly mixed in a porcelain mill with balls. Further technological operations as in example himicheski composition of the obtained IR phosphor - Ybfor 0.4Er0,01Y0,5825CePO4. The relative intensity of Stokes IR luminescence in the region of 1.5 to 1.6 μm, the obtained IR phosphor upon excitation by lasers 0,810 and 0,940 μm is 391 and 475%, respectively. The relative brightness of the visible anti-Stokes luminescence of 33%. The average size of micro-crystals under the microscope 9 microns.

Example 6

Prepare a mixture of the following composition: Y2O3- 131,645 g (22,518 wt.%), Yb2O3- 157,6 g (26,957 wt.%), Er2O3- a 3.83 g (0,655 wt.%), SEO2- 2.58 g (0,442 wt.%), (NH4)2HPO4- 283,8 g (48,543 wt.%), Li2CO3- 5,18 g (0,886 wt.%). For this purpose the components of the mixture are thoroughly mixed in a porcelain mill with balls. Further technological operations as in example 3. The chemical composition of the obtained IR phosphor - Ybfor 0.4Er0,01Y0,5825Ce0,0075PO4. The relative intensity of Stokes IR luminescence in the region of 1.5 to 1.6 μm, the obtained IR phosphor upon excitation by lasers 0,810 and 0,940 μm is 383 and 464%, respectively. The relative brightness of the visible anti-Stokes luminescence of 17%. The average size of micro-crystals under the microscope 7 microns.

Example 7. Prepare a mixture of the following composition: Y2O3- 131,645 g (22,931 wt.%), Yb2O3- 157,6 g (27,452 wt.%), Er2O3- a 3.83 g (0,667 wt.%), CeO2- 2.58 g (0,449 wt.%), (NH4)2 HPO4- 273,24 g (47,599 wt.%), Li2CO3- 5,18 g (0,902 wt.%). For this purpose the components of the mixture are thoroughly mixed in a porcelain mill with balls. The resulting mixture is loaded into quartz crucibles with a capacity of 1.0 liter or in a quartz cuvette with a capacity of 6 l, cover and calcined in air at a temperature of 1150°C for 2 hours. Further technological operations as in example 3. The chemical composition of the obtained IR phosphor - Ybfor 0.4ErY0,5825Ce0,0075PO4. The relative intensity of Stokes IR luminescence in the region of 1.5 to 1.6 μm, the obtained IR phosphor upon excitation by lasers 0,810 and 0,940 μm is 288 356%, respectively. The relative brightness of the visible anti-Stokes luminescence of 21%. The average size of micro-crystals under the microscope 4 microns.

Example 8

Prepare a mixture of the following composition: Y2O3- 131,645 g (22,931 wt.%), Yb2O3- 157,6 g (27,452 wt.%), Er2O3- a 3.83 g (0,667 wt.%), CeO2- 2.58 g (0,449 wt.%), (NH4)2HPO4- 273,24 g (47,599 wt.%), Li2CO3- 5,18 g (0,902 wt.%). For this purpose the components of the mixture are thoroughly mixed in a porcelain mill with balls. The resulting mixture is loaded into quartz crucibles with a capacity of 1.0 liter or in a quartz cuvette with a capacity of 6 l, cover and calcined in air at a temperature of 1050°C for 2 hours. Further technological operations, the AK in example 3. The washed phosphor was filtered, dried and sieved through sieve No. 76. The chemical composition of the obtained IR phosphor - Ybfor 0.4Er0,01Y0,5825CE0,0075PO4. The relative intensity of Stokes IR luminescence in the region of 1.5 to 1.6 μm, the obtained IR phosphor upon excitation by lasers 0,810 and 0,940 μm is 191 and 232%, respectively. The relative brightness of the visible anti-Stokes luminescence of 9%. The average size of micro-crystals under the microscope 3 microns.

Example 9

Prepare a mixture of the following composition: Y2O3- 131,645 g (22,931 wt.%), Yb2O3- 157,6 g (27,452 wt.%), Er2O3- a 3.83 g (0,667 wt.%), CeO2- 2.58 g (0,449 wt.%), (NH4)2HPO4- 273,24 g (47,599 wt.%), Li2CO3- 5,18 (0,902 wt.%). For this purpose the components of the mixture are thoroughly mixed in a porcelain mill with balls. The resulting mixture is loaded into quartz crucibles with a capacity of 1.0 liter or in a quartz cuvette with a capacity of 6 l, cover and calcined in air at a temperature of 900°C for 2 hours. Further technological operations as in example 3. The chemical composition of the obtained IR phosphor - Ybfor 0.4Er0,01Y0,5825CE0,0075PO4. The relative intensity of Stokes IR luminescence in the region of 1.5 to 1.6 μm, the obtained IR phosphor upon excitation by lasers 0,810 and 0,940 μm is 127 and 168%, respectively. Relative activities the Naya brightness visible anti-Stokes luminescence of 0%. The average size of micro-crystals under the microscope 2 microns.

Example 10

Prepare a mixture of the following composition: Y2O3- 203,355 g (39,568 wt.%), Yb2O3to 39.4 g (7,666 wt.%), Er2O3- 0,0383 g (0,00745 wt.%), SEO2- 0,0344 g (0,0067 wt.%), (NH4)2HPO4- 270,54 g (52,64 wt.%), Li2CO3- 0.565 g (0,110 wt.%). For this purpose the components of the mixture are thoroughly mixed in a porcelain mill with balls. The resulting mixture is loaded into quartz crucibles with a capacity of 1.0 liter or in a quartz cuvette with a capacity of 6 l, cover and calcined in air at a temperature of 1250°C for 2 hours. Further technological operations and parameters of the synthesis as in example 3. The chemical composition of the obtained IR phosphor - Y0,8998Yba 0.1Er0,0001Ce0,0001PO4. The relative intensity of Stokes IR luminescence in the region of 1.5 to 1.6 μm, the obtained IR phosphor upon excitation by lasers 0,810 and 0,940 μm is 173 and 215%, respectively. The relative brightness of the visible anti-Stokes luminescence of 29%. The average size of micro-crystals under the microscope 5 microns.

Example 11

Prepare a mixture of the following composition: Y2O3- of 2.26 g (0,341 wt.%), Yb2O3- 346,72 g (52,374 wt.%), Er2O3- to 38.3 g (5,785 wt.%), SEO2- 3,44 g (0.52 wt.%), (NH4)2HPO4- 262,78 g (39,696 wt.%), Li2CO3- 8.5 g (1,284 wt.%). For this is about the components of the mixture are thoroughly mixed in a porcelain mill with balls. The resulting mixture is loaded into quartz crucibles with a capacity of 1.0 liter or in a quartz cuvette with a capacity of 6 l, cover and calcined in air at a temperature of 1250°C for 2 hours.

Further technological operations and parameters of the synthesis as in example 3. The chemical composition of the obtained IR phosphor - Yb0,88Y0,01Era 0.1Ce0,01PO4. The relative intensity of Stokes IR luminescence in the region of 1.5 to 1.6 μm, the obtained IR phosphor upon excitation by lasers 0,810 and 0,940 μm is 281 and 327%, respectively. The relative brightness of the visible anti-Stokes luminescence of 12%. The average size of micro-crystals under the microscope 18 microns.

As shown in the examples of the data declared the IR phosphor when excited by IR radiation range of 0.80-of 0.82 and 0.9-0.98 μm has compared to the prototype of the new complex optical properties, namely:

- high intensity Stokes IR luminescence in the region of 1.5-1.6 ám;

- suppressed visible anti-Stokes luminescence.

In addition, the proposed use in the claimed invention provides a method of obtaining reproducible getting a well-formed microcrystals new IR phosphor in size from 2 to 18 microns with improved lighting options.

Thus, successfully solved the problem of creating the new, "invisible" IR phosphor that has both high intensity Stokes IR luminescence in the region of 1.5 to 1.6 μm, suppressed visible anti-Stokes luminescence and method of its production, provide a well formed microcrystals size 2-18 μm and, as a consequence, the necessary printing and technological properties.

The use of a new phosphor with such complex properties will allow you to:

- use it to protect securities as effective spectrofluorometer infrared radiation range of 0.80-of 0.82 and 0.9-0.98 μm in the region of 1.5-1.6 ám;

to help improve the security of securities by suppressing easily detectable by visual inspection of the visible anti-Stokes luminescence;

- significantly reduce the amount of phosphor per unit surface area of the protective covering securities that will reduce the cost of the securities.

New IR phosphor and the technology of its production during 2008-2009 were several cycles experienced and pilot testing in enterprises manufacturers of securities. According to the results of the tests developed an IR phosphor meets all the requirements for spectral and printing-technological properties and is recommended for industrial production. In 2009, in the prescribed manner designed all technical Doc is a documentation and organized its production.

Notes

1. The brightness of the visible anti-Stokes luminescence excited by an infrared laser with a wavelength 0,940 microns thick layer of powder in cuvettes (geometry 0-45°) was measured by a photomultiplier tube PMT-51, colagiovanni glass filters under the curve of sight, and were compared with the brightness of the phosphor synthesized on the prototype.

2. The relative intensity of Stokes IR luminescence in a thick layer of powder on the glass without binder (geometry 0-45°) in the region of 1.5-1.6 μm, excited by laser radiation length 0,810 and 0,940 μm, was determined using an electronic device FPU-1 and modernized monochromator MDR-204 and compared with the intensity of Stokes IR luminescence in the region of 1.5-1.6 μm phosphor synthesized on the prototype.

1. Infrared phosphor-based yttrium orthophosphate, characterized in that it contains in the cation sublattice as optically active ions only ions Yb3+Er3+CE3+and has a chemical composition corresponding to the following empirical formula:
Y1-x-y-zYbxEryCezPO4,
where is 0.1≤x≤0,88; and 0.0001≤y≤0,1; 1·10-4≤z≤1·10-2.

2. The method of obtaining infrared phosphor according to claim 1, in which the heat treatment in the air charge is C oxides of yttrium, ytterbium, erbium, cerium, phosphorus-containing compounds and mineralizer, characterized in that as the phosphorus-containing compounds using ammonium phosphoric acid dvuhkamernyi, as mineralizer - carbonates of alkali metals: Li, Na, K, and thermal treatment of the mixture is carried out in the temperature range of 900-1250°C.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: fast-moving infrared luminophor based on yttrium orthophosphate has the structure of natural xenotime mineral and has chemical composition with the following empirical formula: Y1-x-yNdxPryPO4 where 1∗10-2≤x≤5∗10-2; 5∗10-4≤y≤1∗10-2. When excited with radiation pulses in the 0.80-0.82 mcm range, the luminophor has Stokes infrared-band luminescence build up and attenuation time in the 1.03-1.1 mcm and 1.30-1.45 mcm regions of not more than 150 mcs.

EFFECT: improved properties of the luminophor.

3 dwg, 4 tbl, 12 ex

FIELD: chemistry.

SUBSTANCE: method involves mixing a tantalum compound with aqueous solution of a terbium salt in stoichiometric ratio which satisfies the composition of terbium tantalate, and thermal treatment of the obtained suspension. The tantalum compound used is tantalum hydroxide, and the terbium salt solution used is terbium acetate solution. The product undergoes thermal treatment at 850-900°C for 8-10 hours.

EFFECT: low synthesis temperature and duration of the process.

1 ex,1 tbl

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: in one version luminescent materials are in form of an aluminate, silicate, germanate or their combination and contain lead and/or copper as well as Eu and/or Mn, or Eu and Dy. In another version the luminescent materials are in form of a silicate or a combination of silicate and germanate and contain lead or copper, as well as Mn and/or Eu. In the third version the luminescent materials are in form of antimonite or a combination of antimonite and germanate and contain lead and/or copper, as well as Mn. The luminescent materials can be germanate or a combination of germanate and silicate and contain lead or copper, as well as Mn or Eu. In the last version the luminescent materials are in form of a phosphate or a combination of phosphate and silicate and contain lead or copper, as well as Mn and/or Eu.

EFFECT: disclosed luminescent materials enable to obtain colour rendering index in a light-emitting device Ra>90, colour temperature range from 2000 K to 8000 K and are characterised by better stability to effect of water, moisture and polar solvents.

7 cl, 20 tbl, 6 ex

FIELD: fire safety.

SUBSTANCE: luminescent composition for hidden marking, exposed when radiated with visible, infrared or ultraviolet radiation, contains binary mix, which includes luminophore with long afterglow on the basis of strontium aluminate, which is activated with europium, dysprosium and yttrium - LDP-1-3M, and photoluminophore with yellow, blue, red or white glow colour. Luminophores are taken with the mass ratio of 70:30. For even glow field, size of luminophore particles is selected in the range of 1-25 mcm, and flow glow of "Star sky" type - in the range of 20-180 mcm. Fire-prevention fireproofing composition includes fire-prevention composition and luminescent additive - specified binary mix. Method for marking of fire-prevention compositions consists in preparation of specified binary mixture, its introduction in amount of 0.01-35 wt parts per 100 wt parts of polymer binder. Produced marking is applied manually, by explication and printing methods in the form of information or graphic symbols, signs, text.

EFFECT: afterglow brightness and duration increase, as well as fire resistance, temperature range of afterglow expands, as a result, fast and reliable detection of fire-prevention composition is provided, as well as visualisation of extinguishing site.

3 cl, 4 tbl

The invention relates to materials for quantum electronics and can be used as active media low level solid-state lasers with optical pumping, in devices of computer science for information display

The invention relates to the technology of fluorescent materials on the basis of yttrium and europium and can be used for the manufacture of plastic film greenhouse

The invention relates to fluorescent compositions that can be used as a filler of plastic film for greenhouses and hothouses

FIELD: chemistry.

SUBSTANCE: disclosed is a luminescent material for a light-emitting device, containing (Y, Gd)-containing material with nanoparticles bound to at least one molecular organic ligand. Also disclosed is a light-emitting device, specifically a light-emitting diode containing said luminescent material, and a system containing said luminescent material and/or said light-emitting device.

EFFECT: disclosed luminescent material is adapted to different semiconductor emission wavelengths and fields where light-emitting diodes are used.

10 cl, 3 dwg, 1 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: fast-moving infrared luminophor based on yttrium orthophosphate has the structure of natural xenotime mineral and has chemical composition with the following empirical formula: Y1-x-yNdxPryPO4 where 1∗10-2≤x≤5∗10-2; 5∗10-4≤y≤1∗10-2. When excited with radiation pulses in the 0.80-0.82 mcm range, the luminophor has Stokes infrared-band luminescence build up and attenuation time in the 1.03-1.1 mcm and 1.30-1.45 mcm regions of not more than 150 mcs.

EFFECT: improved properties of the luminophor.

3 dwg, 4 tbl, 12 ex

FIELD: physics.

SUBSTANCE: described is novel assembling of semiconductor devices combined with optically active compositions. In particular, light-emitting semiconductors based on an InGaN structure, combined with highly efficient optically active langasite crystals La3Ga5SiO14. When activating the langasite, said composition interacts with radiation of the InGaN structure. The langasite absorbs high-energy photons emitted by the InGaN structure, and re-emits light with longer wavelength. Short-wave, high-energy radiation of the InGaN structure is mixed with longer wavelength radiation of the optically active composition and forms a wide spectrum which is perceived by a viewer as white light.

EFFECT: design of a wideband light source based on semiconductor structures, where a langasite photoluminescent phosphor with high radiation excitation efficiency, characteristic of InGaN light-emitting diodes, re-emits light in the middle range of the visible spectrum.

19 cl, 4 tbl, 2 dwg

FIELD: chemistry.

SUBSTANCE: disclosed is a luminescent composition for marking roads, which contains an aluminate type luminescent (phosphorescing) pigment and polymer binder selected from a group comprising: epoxy, urethane, acrylate, alkyd and composite polymer resins. The luminescent pigment is pre-treated in order to protect it from moisture using solutions of reagents selected from a group comprising mono-substituted phosphates, H2SO4, H3PO4, a mixture of tri- or disubstituted phosphates and at least one acid: HCl, H3SO4 or HNO3. Disclosed also is a luminescent paint for making roads, which contains an aluminate type luminescent (phosphorescing) pigment or a luminescent composition and a water or non-water based road paint or enamel. In another version, the luminescent paint is obtained by mixing a pigment which first protected from hydrolysis, polymer binder and a water or non-water based road paint or enamel: - luminescent pigment 2-60; polymer binder 4-20; road paint or enamel 94-20.

EFFECT: invention provides reliable protection of the pigment from hydrolysis, enables regulation of the amount of polymer binder which affects colour characteristics and technological aspects, as well as the size of particles of the luminescent pigment, which is important when mixing the pigment with components of compositions or paints.

4 cl, 8 tbl, 58 ex

FIELD: chemistry.

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

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: chemistry.

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

FIELD: chemistry.

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.

9 ex

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

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 MexaAybRzc, 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

FIELD: chemistry.

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

Up!