Colourless phosphorescing red glowing phosphor

FIELD: chemistry.

SUBSTANCE: colourless phosphorescing red glowing phosphor Eu(L2)3 is a product of reacting a europium (III) compound with [2-(aminocarbonyl)phenoxy]acetic acid (HL2) and subsequent vacuum drying in a furnace at residual pressure of 20 Pa. Said phosphor has phosphorescence maximum at 18636, 14360, 16180, 16860 cm-1 and provides considerable intensity of red luminescence which is 40.43 times higher than quantum efficiency of luminescence compared to existing colourless phosphorescing red glowing phosphor - a compound of europium (III) with salicylic acid.

EFFECT: improved properties.

1 dwg, 1 ex

 

The invention relates to the phosphorescent phosphors, in particular to colorless in daylight the phosphors, which are used in remedies securities and documents from fraud, as well as emitting substances in electroluminescent devices (Katkov M.A., Vituhnovskaya A.G., M. N. Bochkarev. // USP. 2005. T. No. 12. S-1215).

Known phosphorescent phosphors of the red glow that represent various coordination compounds of europium with carboxylate ligands such as Tris-benzoate europium. These coordination compounds have low quantum efficiency of luminescence. (V.Tsaryuk, K.Zhuravlev, V.Zolin, P.Gawryszewska, J.Legendziewicz, V.Kudryashova, I.Pekareva. Regulation of excitation and luminescence efficiencies of europium and terbium benzoates and 8-oxyquinolinates by modification of ligands // Journal of Photochemistry and Photobiology A: Chemistry 177 (2006) 314-323).

Partially the drawbacks are eliminated by the coordination compound of europium(III) with salicylic acid (HL1), having the formula Eu(L1)3(Tris-salicylate europium(III)), which is colorless phosphorescent phosphor of the red glow that is selected as the closest analogue of the prototype. (Eliseeva, S., O. Kotova, Kuzmina N. et al. // Synth. Met. 2004. V.141. P.225). Compared with the above similar it is 2 times more quantum efficiency of luminescence.

The disadvantages are the closest analogue Rel is one of low intensity and quantum efficiency of luminescence.

The technical objective of the claimed invention to provide a colorless effective phosphorescent phosphor of the red luminescence of high intensity luminescence.

To solve this problem is proposed colorless phosphorescent phosphor, which represents a coordination compound of europium(III) with [2-(aminocarbonyl)phenoxy]acetic acid (HL2) and having the formula Eu(L2)3.

The figure shows the luminescence spectrum of the prototype (2) and the luminescence spectrum of the inventive phosphor (1) at room temperature, which represents the dependence of the luminescence intensity wave number.

As can be seen in the figure, the inventive substance has a higher quantum efficiency of luminescence that is determined by the area under the curve of the spectrum of luminescence in the visible region compared to the prototype (40.43 time) and a greater intensity of luminescence that is determined by the height of the peak maxima of the luminescence spectrum. The claimed substance has a maximum phosphorescence when 18636, 14360, 16180, 16860 cm-1.

The coordination compound of europium(III) with [2-(aminocarbonyl)phenoxy]acetic acid (Eu(L2)3) was obtained by the method of ion-exchange synthesis (garnovsky A.D. Modern aspects of the synthesis of metal complexes. Major League is dy and methods / Adherence, Isabelita, Dahanese. - Rostov-on-don: Lapo, 2000. - 335 S.).

Specific example:

[2-(aminocarbonyl)phenoxy]acetic acid mass 0,543 g (2,78-10-3mol) was dissolved in water. In the solution under stirring was added potassium hydroxide to pH 6.5. Then added in small portions a solution of metal salt with a concentration of 1.6 mol/l (9,3·10-4mol). As a result of synthesis of a white precipitate is formed, which was filtered, washed with ethanol and dried to constant weight in a vacuum oven at a residual pressure of 20 PA. The output of the obtained compound was 85,3%. The results of the analysis of the obtained compound, found (%): C, 44.18; H, 3.22; N, 5.61; Eu, 20.7. C27H24EuN3O12. Calculated (%): C, 44.14; H, 3.27; N, 5.67; Eu, 20.7.

The complexation reaction can be expressed by the schema:

The IR spectrum of the claimed synthesized coordination compounds detected absorption bands (cm-1) 3413 ν(=N-H), 1633 ν(C=N), 1609 δ(=N-H), 1596 νas(COO-), 1420 νs(COO-).

Based on the above we can conclude that the coordination compound has a higher efficiency (40,43 time) and the intensity of the red luminescence luminescence in comparison with the prototype, is new and involves an inventive step, i.e. an invention.

Colorless phosphorescing the second red phosphor luminescence of Eu(L2) 3, characterized by the fact that he is the product of the reaction of compounds of europium(III) with [2-(aminocarbonyl)phenoxy]acetic acid (HL2) and subsequent vacuum drying in an oven at a residual pressure of 20 PA.



 

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FIELD: chemistry.

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4 cl, 2 dwg, 4 ex

FIELD: chemistry.

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2 cl, 10 ex, 1 tbl, 2 dwg

FIELD: chemistry.

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2 cl, 4 dwg, 11 ex

FIELD: chemistry.

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FIELD: physics.

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3 dwg, 4 tbl, 12 ex

FIELD: physics.

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19 cl, 4 tbl, 2 dwg

FIELD: chemistry.

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4 cl, 8 tbl, 58 ex

FIELD: chemistry.

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1 dwg, 1 ex

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27 cl, 25 ex

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16 cl, 21 ex

FIELD: chemistry.

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1 cl, 5 dwg, 1 tbl, 4 ex

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6 cl

FIELD: chemistry.

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1 cl, 1 tbl, 12 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.

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1 cl, 1 dwg, 6 ex

FIELD: chemistry.

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9 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: 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: 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: 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

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