DE102014018763A1 - Method for forming a luminescent fluorescent or phosphorescent object, object with this property and application of such an object - Google Patents

Abstract

The present invention relates to a method for forming an object which is translucent, mechanically stable and durable luminescent at the same time. The process reveals that monocrystalline materials such as SrAl 2 O 4: Eu 2+, Dy 3+ or CaAl 2 O 4: Eu 2+, Nd 3+ are particularly suitable for use in afterglow objects, especially in measuring instruments or watches, for example as hands, indices, markers, dials or structured ornaments.

Description

Technical part

The present invention relates to a method of forming an object which is at the same time translucent, mechanically stable and persistently luminescent, consisting of a luminescent material,

It further relates to an object consisting of a luminescent material, with different possible geometries, which is translucent, mechanically stable and long lasting luminescent at the same time, wherein the luminescent material is produced according to the above method.

It also concerns an application of this object.

State of the art

It is known that phosphorescence or so-called cold glow is a particular form of luminescence. Phosphorescence differs from the related phenomenon of fluorescence in that fluorescence decays rapidly after the end of the excitation irradiation, usually within a typical time span of less than a millisecond, whereas phosphorescence persists, lasting from fractions of a second to hours can. Phosphorescent substances are also called luminophores because they seem to store the light.

Various methods that enable the production of luminescent substances are known. Often such processes are based on the preparation of SrAl ₂ O ₄ in powder form which is synthesized with various doping. In the American patent " US 3,294,699 "The doping of SrAl ₂ O ₄ with Eu ^{2+ is} proposed. Eu ²⁺ results in a very efficient afterglow at 520 nm, with a broad emission between about 470 and 570 nm, when previously excitation of the material in the ultraviolet range, preferably between about 250 and 410 nm has taken place.

Other patents dealing with SrAl ₂ O ₄ and similar materials are: US 5,424,006 , wherein the materials used ("Phosphorescent phosphor") MAl ₂ O ₄ , M = Ca, Sr, Ba are; US 5,686,022 , "Phosphorescent phosphorus" M _1-x Al ₂ O _{4 -x} , M = Ca, Sr, Ba; US 7,422,704 , "Phosphorescent phosphor" MAl ₂ O ₄ , M = Sr and Ba, US 7,427,365 , "Phosphorescent phosphor" SrAl ₂ O ₄ .

• – US 6,117,362 , «Long-persistence blue phosphors»,
• – EP 1 762 643 A2 , «Herstellung hochhomogener spannungsarmer Einkristall durch Ziehen, eine Vorrichtung hierfür sowie die Verwendung solcher Kristalle»,
• – US 2010/0200886 A1 , «Wavelength-converted semiconductor light emitting device»,
• – J. of Alloys and Compounds 502 (2010) 38–42 (Authors: Ying-Feng Xu et al.), „Controlled synthesis of single-crystal SrAl2O4:Eu2+, Dy3+ nanosheets with long lasting phosphorescence” ,
• – JP 2001115062 A .

The publications below can be mentioned as prior art. However, they do not violate the novelty and inventiveness of the invention.

• - US 6,117,362 , "Long-persistence blue phosphors",
• - EP 1 762 643 A2 , "Production of highly homogeneous low-stress single crystal by drawing, a device therefor and the use of such crystals",
• - US 2010/0200886 A1 , "Wavelength-converted semiconductor light emitting device",
• - J. of Alloys and Compounds 502 (2010) 38-42 (Authors: Ying-Feng Xu et al.), "Controlled synthesis of single-crystal SrAl2O4: Eu2 +, Dy3 + nanosheets with long lasting phosphorescence" .
• - JP 2001115062 A ,

In the patents cited above, several methods have been described to prepare, inter alia, Eu ²⁺ and Dy ³⁺ co-doped SrAl ₂ O ₄ or Eu ²⁺ and Nd ³⁺ co-doped CaAl ₂ O ₄ . The latter is also excited with ultraviolet light, which in this case leads to afterglow at about 440 nm (with a broad emission between about 470 and 570 nm). The exemplified materials are almost always produced and used in the form of powder, the powder consisting of relatively small crystallites, with typical particle sizes ranging between 50 nm and 100 μm. The powder is commercially available mostly in processed form: embedded z. In various plastics, or as a pigment in a carrier liquid or paste which can deposit and solidify, or as a thin layer applied by conventional thin film deposition techniques on a substrate. The uses of SrAl ₂ O ₄ , CaAl ₂ O ₄ , and known in the art substances such. B. Sr ₄ Al ₁₄ O ₂₅ , SrAl ₁₂ O ₁₉ , BaMgAl ₁₀ O ₁₇ , BaMgAl ₁₄ O ₂₃ , Sr ₂ SiO ₄ with the corresponding dopants, which also show phosphorescence, are widespread and range from luminescent distress labels (eg security warnings), luminescent ornaments and decorative objects, to luminescent display devices, eg. As in gauges or watches, in the form of pointers, indices, dials, or various markings or signs.

In these uses, which are mostly based on powder luminescent substances, the luminescent objects are all not translucent, ie, for an observer, only the front of the object on which the luminescent pigment was applied, visible. In some forms of use, translucent substances based on plastics or glasses doped or mixed with phosphors have been used: however, these substances are relatively soft and therefore have severely limited mechanical properties, which are particularly important in the machining of precision components.

Luminescent single crystals have hitherto only been described in the form of crystal fibers in the literature, see W. Jia, H. Yuan, L. Lu, H. Liu and WM Yen, J. Cryst. Growth 200 (1999) 179 ("SrAl2O4: Eu2 +, Dy3 + and CaAl2O4: Eu2 +, Nd3 + single crystal fibers") , By means of LHPG (ie "Laser Heated Pedestal Growth", a known crystal growth method for the production of single crystals in fiber form) monocrystalline fibers were produced in this publication in an N ₂ + 5% H ₂ atmosphere at 1960 ° C. About the transparency of these monocrystalline fibers is not known.

The fibers are in the raw state a few centimeters long with a diameter of 0.8 mm. Samples of 8 to 10 mm in length were cut to size. The measurements show the expected fluorescence properties. However, such fiber-like samples are unsuitable for producing objects with diameters greater than 1.0 to 2.5 mm or, more preferably, greater than 2.5 to 5 mm, greater than 5 to 15 mm or greater than 15 mm. In samples of preferred sizes, the operator is allowed to fabricate various structures, e.g. B. on the surfaces in the form of labels or in the mass in the form of holes, recesses or profiles.

Brief description of the invention

In order to produce transparent, luminescent and mechanically stable objects, single crystals of luminescent materials would be particularly suitable. Especially crystals with a relatively high melting point have due to their structure very useful properties such as hardness, resistance to chemicals, good polishability, robustness to mechanical stress.

It is therefore an object of the present invention to provide a method by which luminescent objects are produced by simple and effective means.

This object is achieved in that the luminescent material is made of at least one monocrystalline material, wherein the material in geometries in the form of a rod, and / or a disc and / or a cylinder or the like, so that at least one side of the object through the volume of the object is at least partially visible, and wherein the one of at least one monocrystalline material belongs to the materials of the following group: Eu ²⁺ , Dy ³⁺ co-doped SrAl ₂ O ₄ ; Eu ²⁺ , Dy ³⁺ co-doped SrAl ₄ O ₇ ; Eu ²⁺ , Dy ³⁺ co-doped SrAl ₁₂ O ₁₉ ; Eu ²⁺ , Nd ³⁺ co-doped CaAl ₂ O ₄ ; Eu ²⁺ doped SrAl ₂ O ₄ ; Eu ²⁺ doped CaAl ₂ O ₄ ; Eu ²⁺ , Dy ³⁺ co-doped Sr _1-x Ca _x Al ₂ O ₄ with x in the range between 0 and 1.00; Eu ²⁺ , Dy ³⁺ co-doped Sr ₂ SiO ₄ ; Eu ²⁺ , Dy ³⁺ co-doped (Sr _1-u Ba _u ) ₂ SiO ₄ with u in the range between 0 and 1.00; Cr ³⁺ doped ZnGa ₂ O ₄ ; Pr ³⁺ doped NaNbO ₃ ; Pr ³⁺ , Lu ³⁺ co-doped NaNbO ₃ ; Pr ³⁺ , Nd ³⁺ co-doped YPO ₄ .

The inventive object is characterized in that the luminescent material is made of at least one monocrystalline material belonging to the following group: Eu ²⁺ , Dy ³⁺ co-doped SrAl ₂ O ₄ ; Eu ²⁺ , Dy ³⁺ co-doped SrAl ₄ O ₇ ; Eu ²⁺ , Dy ³⁺ co-doped SrAl ₁₂ O ₁₉ ; Eu ²⁺ , Nd ³⁺ co-doped CaAl ₂ O ₄ ; Eu ²⁺ doped SrAl ₂ O ₄ ; Eu ²⁺ doped CaAl ₂ O ₄ ; Eu ²⁺ , Dy ³⁺ co-doped Sr _1-x Ca _x Al ₂ O ₄ with x in the range between 0 and 1.00; Eu ²⁺ , Dy ³⁺ co-doped Sr ₂ SiO ₄ ; Eu ²⁺ , Dy ³⁺ co-doped (Sr _1-u Ba _u ) ₂ SiO ₄ with u in the range between 0 and 1.00; Cr ³⁺ doped ZnGa ₂ O ₄ ; Pr ³⁺ doped NaNbO ₃ ; Pr ³⁺ , Lu ³⁺ co-doped NaNbO ₃ ; Pr ³⁺ , Nd ³⁺ co-doped YPO ₄ .

The inventive application of the object is characterized in that the object of luminescent material of at least one monocrystalline material in measuring instruments and / or ornamental objects is applied.

Description of the drawings

An embodiment of the invention will now be described with reference to the drawings.

1 shows a cylinder of transparent, mechanically stable and luminescent material according to the invention,

2 shows a cylindrical disc from the cylinder of the 1 is manufactured, and,

3 shows a parallelepipedic disc according to the invention.

Best mode of execution of the invention

In the figures, various possible manufacturing methods are used to produce transparent luminescent components from single crystal raw material.

1 shows a cylinder 10 Made of transparent, mechanically stable and luminescent material. Such a cylinder with z. B. 20 mm diameter and 35 mm height can z. B. from a SrAl ₂ O ₄ : Eu ²⁺ , Dy ³⁺ or CaAl ₂ O ₄ : Eu ²⁺ , Nd ³⁺ blank are drilled out. Examples of the crystal chemical preparation of such a blank are explained below. The pictured cylinder can be sliced 11 be sawed. Shown are approx. 25 discs with a thickness of 1.0 mm with a cutting loss of 0.4 mm. Such discs are capable of being ground, polished, labeled and patterned by known surface treatment methods (which are similar to those for processing Al ₂ O ₃ or Y ₃ Al ₅ O ₁₂ crystals).

Typical geometrical dimensions for the discs 11 with applications as display devices, e.g. As a dial in a clock or a meter, are in the range diameter x length equal to 10 to 100 mm, preferably 15 to 60 mm, more preferably 18 to 48 mm. Similar are the discs, which are processed as semi-finished products to smaller components by sawing or drilling.

2 shows a cylindrical disc 11 with a polished first surface 12 and a structured second surface 13 with a structure 14 , As a result of the afterglow of the monocrystalline and transparent material used, the observer can see the luminescent pattern of the second structured lower surface 13 To see particularly well through the volume of the disc. The structure 14 that are on the second surface 12 can be applied by mechanical engraving, laser machining, ion beam machining. Of interest is also a structure 14 which scatters the light by diffusion in different directions: such structures can be created by grinding directly on the surface, or they can be applied as an additional layer to this surface, e.g. B. by applying a grid-like structure or by adhering a film containing such a grid. Because the crystalline material has a suitable hardness and the necessary chemical stability, it can with conventional grinding and polishing agents z. B., Al ₂ O ₃ , SiO ₂ , CeO ₂ , diamond with appropriate grain sizes, processed in aqueous suspensions and purified with known solvents such as ethanol or acetone.

• – Anzeigen für Meßgrößen.
• – Identifikations und Sicherheitsmarkierungen.
• – Markierung von beweglichen Teilen.
• – Leuchtende Merkmale zur Erhöhung der Sichtbarkeit im Dunkeln.
• – Abbildungen, dekorative Bilder, Logos.

3 shows a parallelepipedic disc 21 with a polished first surface 22 and a structured second surface 23 , By the afterglow of the used monocrystalline and transparent material, the observer can emit the luminescent pattern 24 the second, lower surface 23 , through the volume of the disc 21 see very well. The structures in the luminescent components can, for. B. be used for the following purposes:

• - Displays for measured quantities.
• - Identification and security markings.
• - Marking of moving parts.
• - Luminous features to increase visibility in the dark.
• - Illustrations, decorative pictures, logos.

Other processing methods and applications are readily conceivable, since the shapes of the monocrystalline components can be adapted. For example, a transparent luminescent monocrystalline sheet may be adhered to a luminescent, polished-surface, transparent-adhesive ceramics or welded by another method. The luminescent disc can also be used on other documents, u. a. metallic surfaces are applied in a similar manner. The resulting composite structures are very well suited for the applications mentioned above.

Examples of phosphorescent or phosphorescent phosphorescent materials having emission wavelengths between about 400 and 700 nm and excitation wavelengths between 230 and 450 nm, which can be prepared in monocrystalline form are, for. B: Eu ²⁺ , Dy ³⁺ doped SrAl ₂ O ₄ ; Eu ²⁺ , Dy ³⁺ doped SrAl ₄ O ₇ ; Eu ²⁺ , Dy ³⁺ doped SrAl ₁₂ O ₁₉ ; Eu ²⁺ , Nd ³⁺ doped CaAl ₂ O ₄ ; Eu ²⁺ , Dy ³⁺ doped Sr ₂ SiO ₄ ; Eu ²⁺ , Dy ³⁺ doped (Sr _1-u Ba _u ) ₂ SiO ₄ ; Pr ³⁺ doped NaNbO ₃ ; Cr ³⁺ doped ZnGa ₂ O ₄ .

The materials listed here are particularly suitable for the proposed inventions: possible methods of preparation are described in detail in the following sections. It will be apparent to those skilled in the art that the dopants, co-dopants and precise compositions set forth herein can be combined and extended. For example, it is conceivable to generate and use no Dy ³⁺ co-doping in the case of Eu ²⁺ doped SrAl ₂ O ₄ or Eu ²⁺ doped CaAl ₂ O ₄ . It is also conceivable to use mixed crystals such as Eu ²⁺ , Dy ³⁺ doped Sr _1-x Ca _x Al ₂ O ₄ with x in the range between 0 and 1.00. Other crystals and co-dopants are also conceivable, such as. B. Pr ³⁺ , Nd ³⁺ co-doped YPO ₄ or Pr ³⁺ , Lu ³⁺ co-doped NaNbO ₃ single crystals.

• – Verneuil (tiegeloses Verfahren in einem H₂ + O₂ brennenden Gasgemisch);
• – Czochralski (Züchtung aus der Schmelze in einem Tiegel, besonders geeignet für hochschmelzende Oxide oder Fluoride mit kongruentem Schmelzpunkt);
• – TSSG („Top-seeded solution Growth”, Züchtung aus einer Hochtemperaturlösung in einem Tiegel, besonders geeignet für nicht-kongruent Schmelzende Kristalle);
• – Stepanov (Züchtung aus der Schmelze mit einem Formgeber, der die Herstellung von vorgegebenen Kristallprofilen erzwingt),
• – Bridgman (Züchtung aus der Schmelze oder einer Lösung durch Abkühlen eines Tiegels, der durch einen Temperaturgradienten gezogen wird).
• – Abkühlen und auskristallisieren einer Schmelze in einem Behälter, wobei durch spontane Keimbildung einer oder mehrere Kristalle im Behälter wachsen.

Furthermore, the luminescent luminescent or phosphorescent single crystals can be prepared by various methods known to those skilled in the art. Depending on the properties of the material and the desired perfection, a crystal growing method is selected which makes it possible to produce blanks for further processing. Known crystal growth methods are u. A .:

• - Verneuil (crucible process in a H ₂ + O ₂ burning gas mixture);
• - Czochralski (Melting in a crucible, especially suitable for high-melting oxides or fluorides with congruent melting point);
• TSSG ("Top-seeded solution growth", growth from a high-temperature solution in a crucible, particularly suitable for non-congruent melting crystals);
• Stepanov (growth from the melt with a former which forces the production of given crystal profiles),
• Bridgman (growth from the melt or a solution by cooling a crucible which is pulled through a temperature gradient).
• Cooling and crystallization of a melt in a container, wherein one or more crystals grow in the container by spontaneous nucleation.

In the following examples, the first three methods are used, in the case of the Czochralski method with iridium or molybdenum crucible, in the case of TSSG with platinum crucible.

Example No. 1: Czochralski cultivation of Eu ²⁺ , Dy ³⁺ doped SrAl ₂ O ₄ or (Eu _x Dy _y Sr _1-xy ) Al ₂ O ₄ .

The following parameters can be used: x 0.8 mol% y 1.8 mol%

The following starting materials can be used: Eu ₂ O ₃ 2.73 G Dy ₂ O ₃ 6.38 G SrCO ₃ 275.01 G Al ₂ O ₃ 197.85 G Melt without CO ₂ 400.00 G

The starting materials are mixed and in a reducing atmosphere at about 1400 ° C. calcined. Then they are melted at about 1960 ° C. Such a melt allows cultivation according to Czochralski in a 200 ml crucible.

In powder form, the starting materials can also be used in a Verneuil burner. The single crystals obtained show an intense afterglow in the green spectral range under UV excitation, with a cooldown of up to 20 hours. The cooldown can be extended by adjusting the reduction parameters.

Example No. 2: Czochralski culture of Eu ²⁺ , Dy ³⁺ doped SrAl ₄ O ₇ or (Eu _x Dy _y Sr) Al ₄ O ₇ .

The following parameters can be used: x 1 mol% y 2 mol%

The following starting materials can be used: Eu ₂ O ₃ 2.27 G Dy ₂ O ₃ 4.73 G SrO 128.85 G Al ₂ O ₃ 264.13 G Melt without CO ₂ 400.00 G

The starting materials are mixed and in a reducing atmosphere at about 1400 ° C. calcined. Then they are melted at about 2050 ° C. Such a melt allows cultivation according to Czochralski in a 200 ml crucible. In powder form, the starting materials can also be used in a Verneuil burner. The single crystals obtained show an intense afterglow in the green spectral region under UV excitation, but with a lower intensity than in the case of SrAl ₂ O ₄ . The cooldown can be extended by adjusting the reduction parameters.

Example No. 3: Czochralski cultivation of Eu ²⁺ , Dy ³⁺ doped SrAl ₁₂ O ₁₉ or (Eu _x Dy _y Sr) Al ₁₂ O ₁₉

The following parameters can be used: x 1 mol% y 2 mol%

The following starting materials can be used: Eu ₂ O ₃ 1.22 G Dy ₂ O ₃ 2.55 G SrO 69,40 G Al ₂ O ₃ 426.82 G Melt without CO ₂ 500.00 G

The starting materials are mixed and in a reducing atmosphere at about 1400 ° C. calcined. Thereafter, they are melted at about 2150 ° C.

Such a melt allows cultivation according to Czochralski in a 200 ml crucible. The single crystals obtained show an intense afterglow in the green spectral region under UV excitation, but with a lower intensity than in the case of SrAl ₂ O ₄ . The cooldown can be extended by adjusting the reduction parameters.

Example No. 4: TSSG growth of Eu ²⁺ , Nd ³⁺ doped CaAl ₂ O ₄ or (Eu _x Nd _y Ca) Al ₂ O ₄ .

The high temperature solution has the composition: t (Eu _x Nd _y Ca) Al ₂ O ₄ + (1 - t) CaO.

The following parameters can be used: x 0.8 mol% y 1.8 mol% t 28 mol%

The following starting materials can be used: Eu ₂ O ₃ 3.09 G Nd ₂ O ₃ 6.65 G CaCO ₃ 296.65 G Al ₂ O ₃ 224.03 G Solution without CO ₂ 400.00 G

The starting materials are mixed and in a reducing atmosphere at about 1200 ° C. calcined. Thereafter, they are melted at about 1500 ° C.

Such a high temperature solution allows TSSG culture in a 200 ml crucible. The single crystals obtained under UV excitation show an intense afterglow in the blue spectral range, with a cooldown of up to 12 hours. The cooldown can be adjusted by adjusting the reduction parameters.

Example No. 5: TSSG growth of Eu ²⁺ , Dy ³⁺ doped Sr ₂ SiO ₄ or (Eu _x Dy _y Sr) ₂ SiO ₄ .

The high temperature solution has the composition: t (Eu _x Dy _y Sr) ₂ SiO ₄ + (1 - t) SiO ₂ .

The following parameters can be used: x 1 mol% y 0.5 mol% t 22 mol%

The following starting materials can be used: Eu ₂ O ₃ 0.704 G Dy ₂ O ₃ 0,366 G SrCO ₃ 114.75 G SiO ₂ 30.86 G total 120.00 G

The starting materials are mixed and in a reducing atmosphere at about 1400 ° C. calcined. Thereafter, they are melted at about 1950 ° C.

Such a high temperature solution allows TSSG culture in a 100 ml Iridium crucible. The single crystals obtained under UV excitation show an intense afterglow in the yellow spectral range, with a cooldown of up to 30 minutes. The cooldown can be extended by adjusting the reduction parameters.

Example No. 6: TSSG growth of Pr ³⁺ doped NaNbO ₃ or (Pr _x Na ₁ -x) NbO ₃ .

The high temperature solution has the composition: y (Pr _x Na _1-3 ) NbO ₃ + (1-y) Na ₂ O.

The following parameters can be used: y 28 mol% x 0.1 mol%

The following starting materials can be used: Na ₂ CO ₃ 150.34 G Nb ₂ O ₅ 212.09 G Pr ₆ O ₁₁ 0,483 G Solution without CO ₂ 300.00 G

The starting materials are mixed and in air at about 800 ° C. calcined. Thereafter, they are melted at about 1150 ° C. Such a high temperature solution allows TSSG culture in a 100 ml platinum crucible. The single crystals obtained show an intense afterglow in the red spectral range under UV excitation, with a cooldown of up to 15 minutes. The cooldown can be adjusted by adjusting the reduction parameters and by co-doping z. With Lu ³⁺ or Dy ³⁺ ).

Example No. 7: TSSG growth of Cr ³⁺ doped ZnGa ₂ O ₄ or Zn (Cr _x Ga _1-x ) ₂ O ₄ .

The high temperature solution has the composition y (Zn (Cr _x Ga _1-x ) ₂ O ₄ + (1-y) (aPbO + bB ₂ O ₃ ).

The following parameters can be used: x 0.5 mol% y 50 mol% a 1 b 2

The following starting materials can be used: ZnO 12.89 G Cr ₂ O ₃ 0.12 G Ga ₂ O ₃ 29.55 G PbO 35.37 G H ₃ BO ₃ 39,20 G Solution without H ₂ O 100.00 G

The starting materials are mixed and in air at about 800 ° C. calcined. Thereafter, they are melted at about 1150 ° C.

Such a high temperature solution allows TSSG culture in a 100 ml platinum crucible.

The single crystals obtained show an intense afterglow in the red spectral range under short-wave UV excitation, with a cooldown of up to 60 minutes. The cooldown can be extended by adjusting the reduction parameters.

For the method described in the invention, all listed single crystals or single crystals with similar properties that luminesce or phosphoresce luminescent can be used.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 3294699 [0005]
• US 5424006 [0006]
• US 5686022 [0006]
• US 7422704 [0006]
• US 7427365 [0006]
• US 6117362 [0007]
• EP 1762643 A2 [0007]
• US 2010/0200886 A1 [0007]
• JP 2001115062 A [0007]

Cited non-patent literature

• J. of Alloys and Compounds 502 (2010) 38-42 (Authors: Ying-Feng Xu et al.), "Controlled synthesis of single-crystal SrAl2O4: Eu2 +, Dy3 + nanosheets with long lasting phosphorescence" [0007]
• W. Jia, H. Yuan, L. Lu, H. Liu and WM Yen, J. Cryst. Growth 200 (1999) 179 ("SrAl2O4: Eu2 +, Dy3 + and CaAl2O4: Eu2 +, Nd3 + single crystal fibers") [0010]

Claims (11)

A method of forming an object which is at the same time translucent, mechanically stable and persistently luminescent, consisting of a luminescent material, characterized in that the luminescent material is made of at least one monocrystalline material, the material being in geometries in the form of a rod, and / or a disc and / or a cylinder or the like so that at least one side of the object is at least partially visible through the volume of the object, and the one of at least one monocrystalline material belongs to the materials of the group: Eu ²⁺ , Dy ³⁺ co-doped SrAl ₂ O ₄ ; Eu ²⁺ , Dy ³⁺ co-doped SrAl ₄ O ₇ ; Eu ²⁺ , Dy ³⁺ co-doped SrAl ₁₂ O ₁₉ ; Eu ²⁺ , Nd ³⁺ co-doped CaAl ₂ O ₄ ; Eu ²⁺ doped SrAl ₂ O ₄ ; Eu ²⁺ doped CaAl ₂ O ₄ ; Eu ²⁺ , Dy ³⁺ co-doped Sr _1-x Ca _x Al ₂ O ₄ with x in the range between 0 and 1.00; Eu ²⁺ , Dy ³⁺ co-doped Sr ₂ SiO ₄ ; Eu ²⁺ , Dy ³⁺ co-doped (Sr _1-u Ba _u ) ₂ SiO ₄ with u in the range between 0 and 1.00; Cr ³⁺ doped ZnGa ₂ O ₄ ; Pr ³⁺ doped NaNbO ₃ ; Pr ³⁺ , Lu ³⁺ co-doped NaNbO ₃ ; Pr ³⁺ , Nd ³⁺ co-doped YPO ₄ . Process according to claim 1, characterized in that for the first material SrAl ₂ O ₄ the first dopant is Eu ²⁺ , the second Dy ³⁺ is the following concentration 1.5 <[Eu] / [Sr] <5%; 0.3 <[Dy] / [Sr] <2%. Method according to one of claims 1 or 2, characterized in that the monocrystalline material used is grown as a single crystal according to a suitably suitable and adapted to the respective melting point and melting behavior breeding methods. A method according to any one of claims 1-3, characterized in that the luminescent monocrystalline material used is glued and / or soldered and / or grown on a support, the support being a non-luminescent material in the form of one of the following materials: crystal, ceramic , Glass ceramic, glass, metal and plastic. Object consisting of a luminescent material, with various possible geometries which is translucent, mechanically stable and long lasting luminescent at the same time, wherein the luminescent material is produced according to the above method, characterized in that the luminescent material is made of at least one monocrystalline material that the following group belongs: Eu ²⁺ , Dy ³⁺ co-doped SrAl ₂ O ₄ ; Eu ²⁺ , Dy ³⁺ co-doped SrAl ₄ O ₇ ; Eu ²⁺ , Dy ³⁺ co-doped SrAl ₁₂ O ₁₉ ; Eu ²⁺ , Nd ³⁺ co-doped CaAl ₂ O ₄ ; Eu ²⁺ doped SrAl ₂ O ₄ ; Eu ²⁺ doped CaAl ₂ O ₄ ; Eu ²⁺ , Dy ³⁺ co-doped Sr _1-x Ca _x Al ₂ O ₄ with x in the range between 0 and 1.00; Eu ²⁺ , Dy ³⁺ co-doped Sr ₂ SiO ₄ ; Eu ²⁺ , Dy ³⁺ co-doped (Sr _1-u Ba _u ) ₂ SiO ₄ with u in the range between 0 and 1.00; Cr ³⁺ doped ZnGa ₂ O ₄ ; Pr ³⁺ doped NaNbO ₃ ; Pr ³⁺ , Lu ³⁺ co-doped NaNbO ₃ ; Pr ³⁺ , Nd ³⁺ co-doped YPO ₄ . An object according to claim 5, characterized in that for the first material SrAl ₂ O ₄ the first dopant is Eu ²⁺ , the second Dy ³⁺ is the following concentration 1.5 <[Eu] / [Sr] <5%; 0.3 <[Dy] / [Sr] <2%. An object according to claim 5, characterized in that at least one surface of the object has a structure. Object according to claim 7, characterized in that the structure is in the form of an engraving, inscription or marking. Object according to claim 5, characterized in that in the mass of the object holes, and / or recesses and / or profiles are executed. Application of the object according to claims 5 to 9, characterized in that the object of luminescent material of at least one monocrystalline material is applied in measuring instruments and / or ornamental objects. Application of the object according to claim 10, characterized in that the measuring instruments, measuring instruments with pointers and / or indices and / or markings and / or dials and / or security features relate to the decoration.

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