85Kr self-luminous light source and preparation method thereof

Abstract

The invention relates to a 85Kr self-luminous light source and a preparation method thereof.The self-luminous light source comprises a fluorescent ceramic body, a packaging shell, a protection shell and 85Kr gas, the packaging shell is arranged in the protection shell, the fluorescent ceramic body is arranged in the packaging shell, and the packaging shell is filled with the 85Kr gas; the fluorescent ceramic body is made of a porous transparent material, the 85Kr gas permeates and is dispersed into holes in the surface and the interior of the fluorescent ceramic body, and the packaging shell and the protective shell are shells which are integrally pervious to light or pervious to light in a specific direction. Compared with the prior art, the beta ray excitation path can be shortened, the light shielding property of the fluorescent substance and the self-absorption of the < 85 > Kr to the beta ray are reduced, and the utilization rate of the fluorescent substance and the < 85 > Kr is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of radioisotope light sources and relates to a 85 Kr self-luminous light source and preparation method thereof. Background Art

[0002] Self-luminous light sources prepared based on radioactive isotopes (hereinafter referred to as radioactive light sources) have always attracted the attention of researchers at home and abroad due to their characteristics of not requiring external energy, being maintenance-free, and emitting sustainable light. Various types of products have been developed and widely used in military and civilian fields, such as instrument panels, road signs, clock dial pointers, airport landing indication systems and sea and river route night signs, lighting for light and heavy weapon aiming devices, instrument indications of various equipment and instruments, low-light lighting fixtures, markers, etc.

[0003] The use of radioisotopes in the preparation of self-luminous light sources can be traced back to the First World War. 226 Radium isotope and zinc sulfide mixture has been used for aircraft instrument lighting. However, it was found that 226 While the α-rays of Ra and their daughters' β and γ-rays stimulate the matrix to emit light, they also damage the matrix's luminescence properties, causing it to lose its luminescence ability and causing the luminescent powder to ashed. 226 Ra and 90 Due to the biological toxicity of radionuclides such as strontium isotopes, the International Atomic Energy Agency (IAEA) has set regulations on the nuclides used in isotope lighting devices. 147 Pm promethium isotopes and 3 H tritium isotopes gradually replaced the original highly toxic isotopes.

[0004] The radioisotope light sources that have been maturely applied at present are basically 3 H is the excitation source. 3 Compared with H 85 Kr krypton isotope has abundant β radiation, and its luminescence ability is much higher than 3 H. And, 85 Kr is an inert gas and has high safety. 85 Even if the radioactive light source of Kr is damaged, the escaping gas will not react with other substances. 85 Kr has obvious application advantages in radioisotope self-luminous light sources. 85There are few public reports on the research of radioactive light sources of Kr. Currently, only the Oak Ridge National Laboratory in the United States conducted basic research in the 1970s and 1980s and carried out relevant conceptual designs. In China, only the Shanghai Institute of Nuclear Research of the Chinese Academy of Sciences used traditional copper-doped zinc sulfide (ZnS:Cu) luminescent powder in 1984, mixed with a binder and coated on the tube wall, filling it with 85 Kr gas is used to make a surface light source with weak luminous intensity. The binder used in this light source is prone to yellowing and deterioration after irradiation, and then falls off, causing the brightness of the light source to decrease. In addition, the opacity of the phosphor and the thickness of the phosphor coating cause the phosphor to absorb the outgoing photons, thereby reducing the luminous brightness. In addition, 85 There is strong self-absorption of β rays inside the Kr gas, and the contact with the deep phosphor is insufficient, so the utilization rate of the radiation source is low.

[0005] Patent CN114361009A discloses a magnetically confined long-life isotope light source, which includes a packaging shell, which is a fully sealed structure filled with a precursor gas; a thin metal tube is placed in the packaging shell, and the thin metal tube is filled with a radiation source; permanent magnets are respectively arranged on the two outer end faces of the thin metal tube, and the β particles emitted by the radiation source perform spiral motion under the action of the Lorentz force of the magnetic field generated by the permanent magnets, thereby increasing the movement path of the β particles in the precursor gas. However, the substance excited to emit light in this patent is a single rare gas or a mixed gas. To achieve a higher brightness, it is necessary to fill it with relatively high-pressure gas or increase the loading amount of the gas excitation source, that is, to fill it with a higher pressure gas. 3 H or 85 Kr, which requires further improvement of the sealing and safety of the device; the invention does not achieve the reduction of 85 The self-absorption of β rays inside the Kr gas will increase the self-absorption of β rays; in addition, the precursor gas luminescence quantum efficiency is low, and due to the structural characteristics of the patented device, it is difficult to achieve light sources in complex shapes such as arcs, rings, flat plates, spheres, and slender tubes. Summary of the invention

[0006] The purpose of the present invention is to provide a method for overcoming at least one of the above-mentioned defects in the prior art. 85 Kr self-luminous light source and preparation method thereof, the invention can shorten the beta ray excitation path, reduce the light shielding property of fluorescent material and 85 Kr's self-absorption of β rays increases the 85 Kr utilization rate.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] One of the technical solutions of the present invention is to provide a 85Kr self-luminous light source, the self-luminous light source comprises a fluorescent ceramic body, a packaging shell, a protective shell and 85 Kr krypton isotope gas, the protective shell is provided with a packaging shell, the packaging shell is provided with a fluorescent ceramic body, and is filled with 85 Kr gas;

[0009] The fluorescent ceramic body is made of porous transparent material. 85 Kr gas is uniformly infiltrated and dispersed into the surface and internal pores of the fluorescent ceramic body. 85 Kr can release β particles to excite the fluorescent ceramic body to emit light. The packaging shell and the protective shell are shells that are transparent as a whole or transparent in a specific direction.

[0010] Furthermore, the material of the fluorescent ceramic body includes yellow fluorescent Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) Ce-doped YAG, green fluorescent Lu 3 Al 5 O 12 :Ce 3+ (LuAG:Ce 3+ , cerium-doped lutetium aluminum garnet), blue fluorescent BaMgAl 10 O 17 :Eu 2+ (BAM:Eu 2+ , europium-doped barium magnesium aluminate), yellow fluorescent Sr 2.53 Ba 0.47 AlO 4 F:Ce 3+ (SBAOF:Ce 3 + , cerium-doped barium strontium fluoroaluminate) or red fluorescent Lu 3 Al 5 O 12 :Mn 4+ (LuAG:Mn 4+ , manganese-doped lutetium aluminum garnet).

[0011] As a preferred technical solution, the required raw materials and sintering aids are weighed according to the chemical formula, and the fluorescent ceramic body is prepared through ball milling, drying, grinding, screening, high-temperature calcination, molding, cold isostatic pressing, high-temperature sintering, heat treatment and surface treatment.

[0012] As a preferred technical solution, a high-temperature solid-phase method is used to synthesize phosphor powder, which requires strict control of the proportion of each raw material and the amount of sintering aid.

[0013] As a preferred technical solution, high-temperature calcination of the phosphor is used to remove organic impurities contained therein, the temperature is 750-850°C, and the time is 2-4h;

[0014] After cold isostatic pressing, it needs to be calcined again at 750-850℃ to remove impurities for 2-4h.

[0015] As a preferred technical solution, the high temperature sintering temperature varies according to the fluorescent ceramic used, which can be 1500-1800°C, and the time is 4-6h, and it needs to be sintered in different atmospheres, including vacuum conditions, hydrogen atmosphere, air atmosphere or oxygen atmosphere.

[0016] As a preferred technical solution, the vacuum condition is an absolute pressure of 5-10Pa.

[0017] As a preferred technical solution, after high-temperature sintering, the fluorescent ceramic body is subjected to high-temperature annealing oxidation treatment in an air atmosphere or an oxygen atmosphere at a temperature of 1200-1600° C. for a time of 4-6 hours.

[0018] As a preferred technical solution, polishing is performed according to the transparency of the fluorescent ceramic body, or laser etching is performed on the surface of the fluorescent ceramic body according to actual needs;

[0019] The porosity of the fluorescent ceramic body is regulated by adjusting the sintering process (temperature, amount of additives or atmosphere) of the fluorescent ceramic body, thereby controlling the density of the fluorescent ceramic body, and the transparent state of the fluorescent ceramic body is achieved by combining the control of the surface roughness;

[0020] Laser etching technology can also be used to prepare micropores on the surface of fluorescent ceramics to increase the apparent porosity of fluorescent ceramics and thus increase 85 The Kr gas enters the channel of the fluorescent ceramic body.

[0021] As a preferred technical solution, the three-dimensional shapes of the fluorescent ceramic body, packaging shell and protective shell are selected from one or more of columnar, cylindrical, arc-shaped, annular and spherical shapes, and the cross-sectional shapes are selected from one or more of circular, arc-shaped, triangular, square, polygonal and ring-shaped shapes. The cross-sectional shapes of the packaging shell and protective shell can be changed accordingly according to different fluorescent ceramic bodies and usage scenarios.

[0022] Furthermore, the material of the packaging shell is high borosilicate glass, which has high visible light transparency (visible light transmittance can reach 92%), high tensile strength (40-120N / mm 2 ), low melting point (820°C), small thermal expansion coefficient (3.3×10 -6 / K, 20-300℃), heat resistance (270℃ temperature difference) and radiation resistance are good, which can ensure 85Sealing of Kr gas and emission of emitted light.

[0023] Furthermore, the material of the protective shell includes quartz glass, polycarbonate or acrylonitrile-butadiene-styrene copolymer (ABS) resin. The quartz glass has high transparency (visible light transmittance can reach 95%), high strength (increases with wall thickness), and a small thermal expansion coefficient (5.5×10 -7 / K, 20-300°C), can withstand a temperature difference of 1200°C, and has both protective and light-transmitting effects. The polycarbonate is highly transparent to visible light and has high impact resistance (300 times that of ordinary glass). It can provide protection to the internal packaging shell while having good light transmittance (visible light transmittance can reach 91%). The acrylonitrile-butadiene-styrene copolymer resin has excellent impact resistance, good low-temperature performance, good dimensional stability, good surface gloss, and is easy to color.

[0024] Furthermore, when the packaging shell and the protective shell adopt shells that are translucent in a specific direction, the light-transmitting surface of the packaging shell in the specific direction is set as an internal light emitting surface, and the light-transmitting surface of the protective shell in the specific direction is set as an external light emitting surface, and the outer surface of the packaging shell that is not the internal light emitting surface and the outer surface of the protective shell that is not the external light emitting surface are covered with a reflective layer.

[0025] Furthermore, the reflective layer is prepared by the mature "silver mirror method" or is realized by a single-sided polished aluminum alloy sheet. The reflective layer is used to improve the reflectivity of the light emitted by the fluorescent ceramic body in the packaging shell. During the preparation of the reflective layer, a part of the outer surface of the packaging shell and the protective shell with a specific shape and a certain area is retained without being covered by the reflective layer, so as to realize light emission in a specific direction.

[0026] As a preferred technical solution, the polishing roughness of the single-side polished aluminum alloy sheet is ≤1.6 and the thickness is 0.1-0.2 mm.

[0027] One of the technical solutions of the present invention is to provide a 85 A method for preparing a Kr self-luminous light source, the method comprising the following steps:

[0028] S1. Install the fluorescent ceramic body into the packaging shell, install the packaging shell into the heating equipment, connect the gas source equipment and the vacuum equipment, heat while evacuating, and after reaching the vacuum degree, keep the temperature constant and cool naturally to room temperature;

[0029] S2, open 85 Kr gas source equipment, 85 Kr gas is filled into the packaging shell, and the gas source equipment is turned off after the pressure stabilizes;

[0030] S3, using sealing and cutting equipment to seal and cut the packaging shell;

[0031] S4. Assemble the protective shell outside the packaging shell to obtain 85 Kr self-luminous light source.

[0032] Furthermore, in step S1, the heating temperature is 100-300° C., the vacuum degree of the evacuation is 1-10 Pa absolute pressure, and the constant temperature time is 1-2 hours, so as to fully remove the air in the pores of the packaging shell and the fluorescent ceramic body.

[0033] Furthermore, in step S2 85 The filling pressure of Kr gas is 100-300kPa. 85 The filling pressure of Kr gas, or the apparent porosity and transparency of the fluorescent ceramic body, can regulate the luminescence performance of the self-luminous light source.

[0034] As a preferred technical solution, the sealing and cutting equipment in step S3 includes hydrogen-oxygen flame sealing and cutting equipment or carbon dioxide mid-infrared laser sealing and cutting equipment.

[0035] Furthermore, after sealing and cutting in step S3, the outer surfaces of the packaging shell and the protective shell are covered with a reflective layer to increase the light emission intensity in a specific direction.

[0036] As a preferred technical solution, the reflective layer adopts the reaction of silver ammonia solution with glucose and potassium sodium tartrate solution to reduce the silver in the silver ammonia solution to form a silver mirror, or adopts a single-sided polished aluminum alloy sheet to be pressed into a pre-designed snap-on part (the mold is designed in advance based on the assembled packaging shell and protective shell), which is directly assembled with the packaging shell or protective shell.

[0037] As a preferred technical solution, when quartz glass is used as the material of the protective shell in step S4, the packaging shell is installed in the protective shell and then the sealing and cutting in step S3 are performed; when polycarbonate or acrylonitrile-butadiene-styrene copolymer resin is used, a mold is used to make a pre-designed snap-on part (the mold is designed in advance based on the assembled packaging shell), and then it is assembled with the packaging shell.

[0038] One of the technical solutions of the present invention is to provide a 85 A system for preparing a Kr self-luminous light source, using the system to implement the method described, includes a heating device, an air source device, a vacuum device and a sealing and cutting device, the object is installed in the heating device, the air source device and the vacuum device are connected by connecting ferrules and pipelines, and the sealing and cutting device seals and cuts the object.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) The present invention adopts 85Kr krypton isotope is used as the excitation source, and the transparent, porous fluorescent ceramic body with luminescent centers evenly dispersed in the pores is used as the light-emitting material. 85 Kr gas evenly penetrates and disperses into the surface and internal holes of the light-emitting material, and combines closely with the light-emitting center to form a volume light source. 85 Kr gas is in direct contact with the fluorescent ceramic body, and the porous structure of the fluorescent ceramic body forms a three-dimensional space structure. 85 Kr gas molecules are evenly distributed in the three-dimensional space formed by the fluorescent ceramic body, which can excite the deep fluorescent ceramic body, not only shortening the β-ray excitation path, but also reducing the light shielding and 85 Kr's self-absorption of β rays increases the 85 Utilization rate of Kr;

[0041] (2) The transparent fluorescent ceramic body of the present invention can ensure that after the fluorescent ceramic body inside is excited, the photons generated can easily pass through the fluorescent ceramic body and be emitted without being absorbed by the fluorescent ceramic body;

[0042] (3) The shell of the present invention can be entirely light-transmissive to form a body light source, or can be covered with a reflective layer to form a light source that transmits light in a specific direction. Fluorescent ceramic bodies with different colors of fluorescence can also be selected, and light sources with different light transmission directions, fluorescent colors and shapes can be prepared according to needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 In Example 1 of the present invention 85 Schematic diagram of the structure of Kr self-luminous light source;

[0044] Figure 2 In Example 2 of the present invention 85 Schematic diagram of the structure of Kr self-luminous light source;

[0045] Figure 3 In Example 3 of the present invention 85 Schematic diagram of the structure of Kr self-luminous light source;

[0046] Figure 4 In the embodiment of the present invention 85 Schematic diagram of the structure of the preparation device of Kr self-luminous light source.

[0047] Description of the markings in the figure:

[0048] 1—fluorescent ceramic body, 2—packaging shell, 3—protective shell, 4—inner light emitting surface, 5—outer light emitting surface, 6—heating equipment, 7—gas source equipment, 8—sealing and cutting equipment. DETAILED DESCRIPTION

[0049] The present invention is described in detail below in conjunction with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are used to describe common objects, which only refer to different instances of the same object, and are not intended to imply that the objects described in this way must adopt a given order, whether in time, space, order or any other way.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Unless otherwise specified, the equipment used in the following examples are conventional equipment in the art; the reagents used are commercially available products or prepared by conventional methods in the art or methods described in public literature unless otherwise specified. Anything not described in detail in the following examples can be achieved by conventional experimental means in the art.

[0053] Embodiment 1:

[0054] A sort of 85 Kr self-luminous light source, such as Figure 1 As shown, it includes a fluorescent ceramic body 1, a packaging shell 2, a protective shell 3 and 85 Kr krypton isotope gas, a packaging shell 2 is arranged in the protective shell 3, a fluorescent ceramic body 1 is arranged in the packaging shell 2, and a 85 Kr gas;

[0055] The fluorescent ceramic body 1 is made of porous transparent material. 85 Kr gas is uniformly infiltrated and dispersed into the surface and internal pores of the fluorescent ceramic body 1. 85Kr can release β particles to excite the fluorescent ceramic body 1 to emit light. The encapsulating shell 2 and the protective shell 3 can be shells that are transparent as a whole or transparent in a specific direction. In this embodiment, the shell is preferably transparent as a whole;

[0056] The material of the fluorescent ceramic body 1 can be Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ , cerium-doped yttrium aluminum garnet), green fluorescent Lu 3 Al 5 O 12 :Ce 3+ (LuAG:Ce 3+ , cerium-doped lutetium aluminum garnet), blue fluorescent BaMgAl 10 O 17 :Eu 2+ (BAM:Eu 2+ , europium-doped barium magnesium aluminate), yellow fluorescent Sr 2.53 Ba 0.47 AlO 4 F:Ce 3+ (SBAOF:Ce 3+ , cerium-doped barium strontium fluoroaluminate) or red fluorescent Lu 3 Al 5 O 12 :Mn 4+ (LuAG:Mn 4+ , manganese-doped lutetium aluminum garnet), preferably yellow fluorescent YAG:Ce in this embodiment 3+ ;

[0057] The required raw materials and sintering aids are weighed according to the chemical formula, and the fluorescent ceramic body 1 is prepared through ball milling, drying, grinding, screening, high-temperature calcination, molding, cold isostatic pressing, high-temperature sintering, heat treatment and surface treatment;

[0058] The high-temperature solid-phase method is used to synthesize the phosphor, which requires strict control of the proportion of each raw material and the amount of sintering aids;

[0059] High temperature calcination of the phosphor is used to remove organic impurities contained in it, the temperature is 800℃, and the time is 3h;

[0060] After cold isostatic pressing, it needs to be calcined again at 800℃ for 3h to remove impurities;

[0061] The temperature of high temperature sintering varies according to the fluorescent ceramic body 1 used, and can be 1500-1800° C., preferably 1650° C. in this embodiment, and the time is 4-6 hours, preferably 5 hours in this embodiment, and the sintering needs to be performed under different atmospheres, such as vacuum conditions, hydrogen atmosphere, air atmosphere or oxygen atmosphere, preferably vacuum conditions and absolute pressure of 5-10 Pa in this embodiment, and more preferably absolute pressure of 8 Pa in this embodiment;

[0062] After high-temperature sintering, the fluorescent ceramic body 1 is subjected to high-temperature annealing oxidation treatment, which can be carried out in an air atmosphere or an oxygen atmosphere at a temperature of 1200-1600° C. for 4-6 hours. In this embodiment, it is preferably annealed at 1400° C. in an air atmosphere for 5 hours.

[0063] Finally, the fluorescent ceramic body 1 is polished according to its transparency, or the surface of the fluorescent ceramic body 1 is laser etched according to actual needs;

[0064] The porosity of the fluorescent ceramic body 1 is regulated by adjusting the sintering process (temperature, amount of additives or atmosphere) of the fluorescent ceramic body 1, thereby controlling the density of the fluorescent ceramic body 1, and the transparent state of the fluorescent ceramic body 1 is achieved in combination with the control of the surface roughness;

[0065] Laser etching technology can also be used to prepare micropores on the surface of the fluorescent ceramic body 1 to increase the apparent porosity of the fluorescent ceramic body 1, thereby increasing 85 The channel for Kr gas to enter the fluorescent ceramic body 1;

[0066] 85 The filling pressure of Kr gas is 100-300 kPa, preferably 100 kPa in this embodiment. 85 The filling pressure of Kr gas, or the apparent porosity and transparency of the fluorescent ceramic body 1, can regulate the luminous properties of the self-luminous light source;

[0067] The three-dimensional shape of the fluorescent ceramic body 1 can be columnar, cylindrical, arc-shaped, annular or spherical, and the cross-sectional shape can be circular, triangular, square or polygonal. In this embodiment, it is preferably cylindrical. The three-dimensional shape of the packaging shell 2 and the protective shell 3 is cylindrical. The cross-sectional shape can be changed according to the different fluorescent ceramic body 1 and the use scene. In this embodiment, it is preferably cylindrical.

[0068] The material of the packaging shell 2 is high borosilicate glass, which has high visible light transparency (visible light transmittance can reach 92%) and high tensile strength (40-120N / mm 2 ), low melting point (820°C), small thermal expansion coefficient (3.3×10 -6 / K, 20-300℃), heat resistance (270℃ temperature difference) and radiation resistance are good, which can ensure85 Sealing of Kr gas and emission of emitted light;

[0069] The material of the protective shell 3 can be quartz glass, polycarbonate or acrylonitrile-butadiene-styrene copolymer (ABS) resin. Quartz glass has high transparency (visible light transmittance can reach 95%), high strength (increases with wall thickness), and a small thermal expansion coefficient (5.5×10 -7 / K, 20-300°C), can withstand a temperature difference of 1200°C, and has both protection and light transmission. Polycarbonate is highly transparent to visible light and has high impact resistance (300 times that of ordinary glass). It can provide protection to the internal packaging shell 2 while having good light transmission (visible light transmittance can reach 91%). ABS resin has excellent impact resistance, good low-temperature performance, good dimensional stability, good surface gloss, and is easy to color. In this embodiment, quartz glass is preferably used;

[0070] The protective shell 3 may partially cover (similar to an embedded display screen, where the display screen is covered by materials) or fully cover the internal packaging shell 2, depending on the materials used. In this embodiment, full coverage is preferred.

[0071] Above 85 The preparation method of Kr self-luminous light source, such as Figure 4 As shown, the specific steps are as follows:

[0072] S1, install the fluorescent ceramic body 1 into the packaging shell 2, install the packaging shell 2 into the heating device 6, connect the gas source device 7 and the vacuum device, and heat to 100-300°C while evacuating, preferably 150°C in this embodiment, and reach a vacuum degree of 1-10Pa absolute pressure, preferably 5Pa absolute pressure in this embodiment, keep the temperature constant for 1-2h, preferably 1h in this embodiment, and naturally cool to room temperature to fully remove the air in the pores of the packaging shell 2 and the fluorescent ceramic body 1;

[0073] S2, open 85 The gas source equipment 7 of Kr gas will 85 Kr gas is filled into the packaging shell 2, 85 The filling pressure of Kr gas is 100-300 kPa, preferably 100 kPa in this embodiment, and the gas source device 7 is turned off after the pressure stabilizes;

[0074] S3, using a sealing and cutting device 8 to seal and cut the packaging shell 2, the sealing and cutting device 8 can be a hydrogen-oxygen flame sealing and cutting device or a carbon dioxide mid-infrared laser sealing and cutting device, and in this embodiment, the hydrogen-oxygen flame sealing and cutting device is preferably used;

[0075] S4, assembling the protective shell 3 outside the encapsulation shell 2 to obtain 85Kr is a self-luminous light source. If the material of the protective shell 3 is quartz glass, the packaging shell 2 can be installed in the protective shell 3 and then the sealing and cutting in step S3 can be adopted; if polycarbonate or ABS resin is used, a mold can be used to make a pre-designed snap-on part (the mold is designed in advance according to the assembled packaging shell 2), and then assembled with the packaging shell 2. In this embodiment, quartz glass is preferred.

[0076] A sort of 85 A preparation system for a Kr self-luminous light source, which uses the system to implement the above method, includes a heating device 6, an air source device 7, a vacuum device and a sealing and cutting device 8. The object is installed in the heating device 6, and the air source device 7 and the vacuum device are connected by connecting ferrules and pipelines. The sealing and cutting device 8 seals and cuts the object.

[0077] In Example 1, under vacuum conditions, the fluorescent ceramic body 1 is sintered at a high temperature of 1650° C., the apparent porosity is reduced to 7%, and the transparency is increased to 34%. 85 When the filling pressure of Kr gas is 100 kPa, its relative fluorescence intensity increases from 1 (initial temperature of high-temperature sintering is 1400°C) to 1.13.

[0078] Embodiment 2:

[0079] A sort of 85 Kr self-luminous light source and preparation method thereof, such as Figure 2 As shown, it is basically the same as Example 1, except that the cylindrical encapsulating shell 2 and the protective shell 3 are shells with square windows on the side wall of the cylinder, the light-transmitting surface of the encapsulating shell 2 in a specific direction is set as the inner light emitting surface 4, the light-transmitting surface of the protective shell 3 in a specific direction is set as the outer light emitting surface 5, and the outer surface of the encapsulating shell 2 other than the inner light emitting surface 4 and the outer surface of the protective shell 3 other than the outer light emitting surface 5 are covered with a reflective layer;

[0080] The material of the fluorescent ceramic body 1 is red fluorescent LuAG:Mn 4+ ;

[0081] The high temperature sintering temperature of the fluorescent ceramic body 1 is 1750°C, the time is 5 hours, and it needs to be sintered under vacuum conditions and an absolute pressure of 8Pa;

[0082] After high-temperature sintering, the fluorescent ceramic body 1 is annealed at 1500° C. in an oxygen atmosphere for 5 h;

[0083] The material of the protective shell 3 is ABS resin;

[0084] The reflective layer can be prepared by the mature "silver mirror method" or by a single-sided polished aluminum alloy sheet (polishing roughness ≤ 1.6, thickness can be 0.1-0.2mm). The reflective layer is used to increase the reflectivity of the light emitted by the fluorescent ceramic body 1 in the packaging shell 2. During the preparation of the reflective layer, a portion of the outer surface of the packaging shell 2 and the protective shell 3 with a specific shape and a certain area is retained without being covered by the reflective layer to achieve light emission in a specific direction. In this embodiment, a single-sided polished 6061 aluminum alloy sheet with a polishing roughness of 1.5 and a thickness of 0.15mm is preferred.

[0085] Above 85 The preparation method of the Kr self-luminous light source is basically the same as that of Example 1, except that in step S1, the temperature is kept constant for 1.5 hours after the vacuum is evacuated and heated to 100°C.

[0086] In step S2 85 The filling pressure of Kr gas is 200kPa;

[0087] After sealing and cutting in step S3, the outer surfaces of the packaging shell 2 and the protective shell 3 are covered with a reflective layer to increase the light emission intensity in a specific direction. The reflective layer can be made by reacting a silver ammonia solution with a glucose and a potassium sodium tartrate solution to reduce the silver in the silver ammonia solution to form a silver mirror. Alternatively, a single-sided polished aluminum alloy sheet can be used to press into a pre-designed snap-on part (the mold is designed in advance based on the assembled packaging shell 2 and protective shell 3), which is directly assembled with the packaging shell 2 or the protective shell 3. In this embodiment, a single-sided polished aluminum alloy sheet is preferred.

[0088] In Example 2, under vacuum conditions, the fluorescent ceramic body 1 is sintered at a high temperature of 1750° C., the apparent porosity is reduced to 1%, and the transparency is increased to 80%. 85 When the filling pressure of Kr gas is 200 kPa, its relative fluorescence intensity increases from 1 (initial temperature of high-temperature sintering is 1400°C) to 1.31.

[0089] Embodiment 3:

[0090] A sort of 85 Kr self-luminous light source, such as Figure 3 As shown, it is basically the same as the second embodiment, except that the cylindrical encapsulating shell 2 and the protective shell 3 are shells with a completely open window on one side of the cylindrical end surface;

[0091] The material of the fluorescent ceramic body 1 is green fluorescent LuAG:Ce 3+ ;

[0092] The high temperature sintering temperature of the fluorescent ceramic body 1 is 1700°C, the time is 5 hours, and it needs to be sintered under vacuum conditions and an absolute pressure of 8Pa;

[0093] After high-temperature sintering, the fluorescent ceramic body 1 is annealed at 1400° C. in an air atmosphere for 5 h;

[0094] The material of the protective shell 3 is polycarbonate;

[0095] The reflective layer of the packaging shell 2 is made of a silver mirror, and the reflective layer of the protective shell 3 is made of a single-sided polished 6061 aluminum alloy sheet.

[0096] Above 85 The preparation method of the Kr self-luminous light source is basically the same as that of Example 2, except that in step S1, the temperature is kept constant for 1.5 hours after the vacuum is evacuated and heated to 150°C.

[0097] In step S2 85 The filling pressure of Kr gas is 300kPa.

[0098] In Example 3, under vacuum conditions, the fluorescent ceramic body 1 is sintered at a high temperature of 1700°C, the apparent porosity is reduced to 1.5%, and the transparency is increased to 82%. 85 When the filling pressure of Kr gas is 300 kPa, its relative fluorescence intensity increases from 1 (initial temperature of high-temperature sintering is 1400°C) to 1.33.

[0099] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A 85 Kr self-luminous light source, characterized in that The self-luminous light source comprises a fluorescent ceramic body (1), a packaging shell (2), a protective shell (3) and 85 Kr gas, a packaging shell (2) is arranged in the protection shell (3), a fluorescent ceramic body (1) is arranged in the packaging shell (2), and a 85 Kr gas; The fluorescent ceramic body (1) is made of porous transparent material. 85 Kr gas permeates and disperses into the surface and internal holes of the fluorescent ceramic body (1), and the encapsulation shell (2) and the protection shell (3) are shells that are entirely light-transmissive or light-transmissive in a specific direction.

2. A method according to claim 1 85 Kr self-luminous light source, characterized in that The material of the fluorescent ceramic body (1) includes Y3Al5O 12 :Ce 3+ 、Lu3Al5O 12 :Ce 3+ 、BaMgAl 10 O 17 :Eu 2+ , Sr 2.53 Ba 0.47 AlO4F:Ce 3+ or Lu3Al5O 12 :Mn 4+ .

3. A method according to claim 1 85 Kr self-luminous light source, characterized in that The packaging shell (2) is made of high borosilicate glass.

4. A method according to claim 1 85 Kr self-luminous light source, characterized in that The material of the protective shell (3) includes quartz glass, polycarbonate or acrylonitrile-butadiene-styrene copolymer resin.

5. A method according to claim 1 85 Kr self-luminous light source, characterized in that When the encapsulation shell (2) and the protective shell (3) are shells that are translucent in a specific direction, the translucent surface of the encapsulation shell (2) in the specific direction is set as an inner light emitting surface (4), and the translucent surface of the protective shell (3) in the specific direction is set as an outer light emitting surface (5), and the outer surface of the encapsulation shell (2) that is not the inner light emitting surface (4) and the outer surface of the protective shell (3) that is not the outer light emitting surface (5) are covered with a reflective layer.

6. A method according to claim 5 85 Kr self-luminous light source, characterized in that The reflective layer is made of a silver mirror or a single-sided polished aluminum alloy sheet. During the preparation of the reflective layer, a portion of the outer surface of the packaging shell (2) and the protective shell (3) is retained without being covered by the reflective layer, thereby achieving light emission in a specific direction.

7. A method according to any one of claims 1 to 6 85 The method for preparing a Kr self-luminous light source is characterized in that: The method comprises the following steps: S1, installing the fluorescent ceramic body (1) into the packaging shell (2), installing the packaging shell (2) into the heating device (6), connecting the gas source device (7) and the vacuum device, heating while evacuating, and after reaching the vacuum degree, maintaining the constant temperature and naturally cooling to room temperature; S2, open 85 The gas source equipment (7) of Kr gas will 85 Kr gas is filled into the packaging shell (2), and the gas source device (7) is turned off after the pressure is stabilized; S3, using a sealing and cutting device (8) to seal and cut the packaging shell (2); S4, assembling the protective housing (3) outside the encapsulating housing (2) to obtain 85 Kr self-luminous light source.

8. A method according to claim 7 85 The method for preparing a Kr self-luminous light source is characterized in that: In step S1, the heating temperature is 100-300° C., the vacuum degree of the evacuation is 1-10 Pa absolute pressure, and the constant temperature time is 1-2 h.

9. A method according to claim 7 85 The method for preparing a Kr self-luminous light source is characterized in that: In step S2 85 The filling pressure of Kr gas is 100-300kPa.

10. A method according to claim 7 85 The method for preparing a Kr self-luminous light source is characterized in that: In step S3, after sealing and cutting, the outer surfaces of the packaging shell (2) and the protective shell (3) are covered with a reflective layer.

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