A low-dimensional halide scintillation material and its preparation method and application

Abstract

The present invention belongs to the technical field of ionizing radiation detection materials, and specifically relates to a low-dimensional halide scintillation material and its preparation method and application. The chemical formula of the material is A8BC3X 18 ; A is Cs; B is selected from at least one of Cu, Ag, Au, In and Tl; C is selected from at least one of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu; X is selected from at least one of F, Cl, Br and I. The material is easy to be made into single crystal, powder and polycrystalline film, and has the advantages of non-(weak) deliquescence, high ionizing radiation luminescence efficiency, no flickering luminescence self-absorption, high light output, low afterglow, high energy resolution, etc. It has important application prospects in the fields of medical imaging, security inspection, oil well exploration and industrial detection.

Description

[0001] This application is a divisional application. The application number of the original application is 202311604804.8, and the original application date is November 29, 2023. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present invention belongs to the technical field of ionizing radiation detection materials, and specifically relates to a low-dimensional halide scintillating material and a preparation method and application thereof, and in particular to a perovskite-derived scintillating material based on rare earth cluster enhancement and a preparation method and application thereof. Background Art

[0003] As a kind of ionizing radiation detection material, scintillation material can convert high-energy particles (α, β, γ radiation) or rays incident into it into low-energy photon beams. With the increasing performance requirements for nuclear radiation detectors in high-end medical imaging, security inspection, oil well exploration, and high-energy physics, it is urgent to develop new high-performance scintillation materials.

[0004] To date, the most commonly used commercial scintillators are compounds activated by external doping ions, such as thallium-doped sodium iodide (NaI:Tl), thallium-doped cesium iodide (CsI:Tl) and cerium-doped yttrium-lutetium silicate (Lu 1.8 Y 0.2 SiO5:Ce). However, this type of scintillating material usually has a segregation effect during the growth of doped ions. When it is used in large sizes, it will cause uneven distribution of doped ions and lead to non-uniform luminescence and scintillation detection performance of the crystal, which limits their further application and development. Compared with scintillating materials activated by external ions, self-activated (intrinsic) luminescent scintillating materials have the advantage of good luminescence uniformity, which can prevent their performance from deteriorating when the crystal size is enlarged. So far, several Ce-based scintillating materials have been discovered. 3+ 、Eu 2+ and Tl + Ion-activated high-performance scintillating materials, such as CeBr3, Cs4EuBr6 and TlMgCl3, have light yields ranging from 30,000 to 78,000 photons / MeV at 662 keV gamma rays, and energy resolutions ranging from 3.7% to 4.3%. However, due to the weak electron-phonon coupling associated with electronic transitions, these self-activated scintillating materials often suffer from self-absorption, which seriously degrades their performance when they are scaled up for application.

[0005] In recent years, some highly sensitive scintillating materials with intrinsic luminescence from self-trapped exciton (STE) emission have emerged, such as Cs3Cu2I5, Cs2HfCl6, etc. They have intrinsic properties such as high exciton binding energy and large Stokes shift induced by strong electron-phonon coupling, which makes them have no ionizing radiation luminescence self-absorption effect and show corresponding bright scintillation emission. For example, Cs2HfCl6 scintillating material with strong localized exciton emission has a high light yield of 54,000 photons / MeV and an excellent energy resolution of 3.3% at 662 keV. In addition, some copper-based low-dimensional perovskites are promising intrinsic scintillating materials. For example, low-dimensional perovskites Cs3Cu2I5 and CsCu2I3 can be used as sensitive X / γ-ray scintillating materials. These materials are stable in air, superior to other hygroscopic halide scintillating materials, and have great application potential in the field of radiation detection. my country is a major rare earth country and has the ability to ensure independent and large-scale supply of rare earth resources. Therefore, if we can explore and create rare earth-based STE high-sensitivity scintillation materials with independent intellectual property rights, it will have global strategic significance for solving the problem of "ultra-high performance scintillation detection materials for deep sea and deep space", increasing the added value of rare earths, and optimizing the industrial chain.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a low-dimensional halide scintillation material and a preparation method and application thereof.

[0008] In the first aspect, the present invention provides a low-dimensional halide scintillating material based on rare earth cluster enhancement. The chemical formula of the low-dimensional halide scintillating material based on rare earth cluster enhancement is A8BC3X 18 ;

[0009] Wherein, A is selected from at least one of Cs, In and Tl;

[0010] B is selected from at least one of Cu, Ag, Au, In and Tl, and A and B have different elemental compositions;

[0011] C is at least one selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu;

[0012] X is at least one selected from F, Cl, Br and I.

[0013] In the present invention, the A-position element is selected from A8BC3X obtained by Cs, In, and Tl elements.18 The steady-state scintillation efficiency of scintillating materials can be increased by more than 300% compared with Rb-based materials; 87 The natural radioactive background of Rb, the radioactive background-free A8BC3X obtained by using Cs, In, and Tl elements 18 Scintillating materials have a wider range of applications; since the atomic numbers of Cs, In, and Tl are much larger than Rb, A8BC3X 18 Scintillating materials can significantly reduce the radiation length of scintillating materials, which is beneficial to the miniaturization of detectors.

[0014] Preferably, the chemical formula of the low-dimensional halide scintillating material based on rare earth cluster enhancement is (Cs 1-x D x )8BC3X 18 , 0<x<1 (e.g. 0.1, 0.2, 0.3, 0.4, 0.5, 0.7, 0.9);

[0015] wherein D is selected from at least one of Na, K, Rb, In and Tl;

[0016] B is at least one selected from Cu, Ag, Au, In and Tl;

[0017] C is at least one selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu;

[0018] X is at least one selected from F, Cl, Br and I.

[0019] Preferably, the chemical formula of the low-dimensional halide scintillating material based on rare earth cluster enhancement is (In 1-y E y )8BC3X 18 , 0<y<1 (e.g. 0.1, 0.2, 0.3, 0.4, 0.5, 0.7, 0.9);

[0020] Wherein, E is selected from at least one of Na, K, Rb, Cs and Tl;

[0021] B is at least one selected from Cu, Ag, Au, In and Tl;

[0022] C is at least one selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu;

[0023] X is at least one selected from F, Cl, Br and I.

[0024] Preferably, the chemical formula of the low-dimensional halide scintillating material based on rare earth cluster enhancement is (Tl 1-z M z )8BC3X 18 , 0<z<1 (e.g. 0.1, 0.2, 0.3, 0.4, 0.5, 0.7, 0.9);

[0025] Wherein, M is selected from at least one of Na, K, Rb, Cs and In;

[0026] B is at least one selected from Cu, Ag, Au, In and Tl;

[0027] C is at least one selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu;

[0028] X is at least one selected from F, Cl, Br and I.

[0029] Preferably, the form of low-dimensional halide scintillating materials based on rare earth cluster enhancement is bulk single crystal, powder or polycrystalline thin film. These three forms can meet the requirements of the application end for the form in a targeted manner, among which bulk single crystal is more suitable for gamma spectroscopy detection; powder is more suitable for radiation warning luminescence; polycrystalline thin film is more suitable for the field of X-ray imaging.

[0030] Preferably, when the rare earth cluster-enhanced low-dimensional halide scintillating material is a bulk single crystal, the size of the bulk single crystal in at least one dimension is at least 1 mm, preferably at least 2 mm. A certain thickness is conducive to depositing more radiation / particle energy and is more suitable for gamma spectrum detection.

[0031] Preferably, when the rare earth cluster-enhanced low-dimensional halide scintillating material is a powder (solid phase synthesis), the particle size of the powder is 1nm to 20μm. The appropriate particle size is convenient for subsequent use in radiation warning luminescence or as a precursor material for imaging film / screen.

[0032] Preferably, when the rare earth cluster-enhanced low-dimensional halide scintillating material is a polycrystalline film, the thickness of the polycrystalline film is 1 μm to 1000 μm. A polycrystalline film of a certain thickness can achieve radiation / particle energy deposition while meeting the requirements of high-efficiency imaging.

[0033] In a second aspect, the present invention provides a method for preparing a low-dimensional halide scintillating material based on rare earth cluster enhancement. The chemical formula of the low-dimensional halide scintillating material based on rare earth cluster enhancement is A8BC3X 18 ;

[0034] Wherein, A is selected from at least one of Cs, In and Tl;

[0035] B is selected from at least one of Cu, Ag, Au, In and Tl, and A and B have different elemental compositions;

[0036] C is at least one selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu;

[0037] X is at least one selected from F, Cl, Br and I.

[0038] The low-dimensional halide scintillating material based on rare earth cluster enhancement is a bulk single crystal, and the preparation method includes: according to the chemical formula of the low-dimensional halide scintillating material based on rare earth cluster enhancement is A8BC3X 18 AX powder, BX powder and CX3 powder were weighed and mixed to use as raw material powders, and a crucible descent method was used to grow a low-dimensional halide scintillating material enhanced by rare earth clusters.

[0039] Preferably, the purity of AX powder is above 99.9%; the purity of BX powder is above 99.9%; and the purity of CX3 powder is above 99.9%.

[0040] Preferably, the steps and parameters of the crucible descent method are as follows:

[0041] (1) Place the raw material powder in a quartz crucible with a capillary structure, evacuate to vacuum and seal with welding;

[0042] (2) Place the sealed quartz crucible vertically in a crystal growth furnace, then heat it to the highest melting point of the raw material and keep it warm so that the raw material powder is completely melted and mixed evenly;

[0043] (3) adjusting the position of the quartz crucible and / or the furnace temperature so that the temperature at the bottom of the capillary structure of the quartz crucible is maintained between the melting point of the rare earth cluster-enhanced low-dimensional halide scintillating material and ±10 °C;

[0044] (4) Controlling the growth temperature gradient of the crystal growth furnace to 5 to 50°C / cm, and then lowering the quartz crucible in the furnace body at a descending speed of 0.01 to 10.0 mm / h to start crystal growth;

[0045] (5) After the growth is completed, cool down to room temperature at a rate of 0.5 to 50°C / h.

[0046] In a third aspect, the present invention provides a method for preparing a low-dimensional halide scintillating material based on rare earth cluster enhancement. The chemical formula of the low-dimensional halide scintillating material based on rare earth cluster enhancement is A8BC3X 18 ;

[0047] Wherein, A is selected from at least one of Cs, In and Tl;

[0048] B is selected from at least one of Cu, Ag, Au, In and Tl, and A and B have different elemental compositions;

[0049] C is at least one selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu;

[0050] X is at least one selected from F, Cl, Br and I.

[0051] The low-dimensional halide scintillating material based on rare earth cluster enhancement is a powder, and the preparation method includes:

[0052] (1) According to the general chemical formula of the rare earth cluster-enhanced low-dimensional halide scintillating material, A8BC3X 18 AX powder, BX powder and CX3 powder are weighed and mixed as raw material powders, and then placed in a quartz tube and evacuated to vacuum and sealed by welding;

[0053] (2) The welded quartz tube is heat-treated at 400-1100° C. for 1-10 hours to obtain a powdered rare earth cluster-enhanced low-dimensional halide scintillating material.

[0054] Preferably, the purity of AX powder is above 99.9%; the purity of BX powder is above 99.9%; and the purity of CX3 powder is above 99.9%.

[0055] In a fourth aspect, the present invention provides a method for preparing a low-dimensional halide scintillating material based on rare earth cluster enhancement. The chemical formula of the low-dimensional halide scintillating material based on rare earth cluster enhancement is A8BC3X 18 ;

[0056] Wherein, A is selected from at least one of Cs, In and Tl;

[0057] B is selected from at least one of Cu, Ag, Au, In and Tl, and A and B have different elemental compositions;

[0058] C is at least one selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu;

[0059] X is at least one selected from F, Cl, Br and I.

[0060] The low-dimensional halide scintillating material based on rare earth cluster enhancement is a polycrystalline film, and the preparation method includes:

[0061] (1) According to the general chemical formula of the rare earth cluster-enhanced low-dimensional halide scintillating material, A8BC3X 18AX powder, BX powder and CX3 powder are weighed and mixed as raw material powders, and then placed in a quartz tube and evacuated to vacuum and sealed by welding;

[0062] (2) Heat the sealed quartz tube at 400-1100°C for 1-10 hours to obtain A8BC3X 18 Powder;

[0063] (3) A8BC3X was evaporated by single source evaporation method 18 The powder is coated on the surface of the substrate to obtain a low-dimensional halide scintillating material enhanced by rare earth clusters.

[0064] Preferably, the purity of AX powder is above 99.99%; the purity of BX powder is above 99.99%; and the purity of CX3 powder is above 99.99%.

[0065] Preferably, the parameters of the single source evaporation method include: evacuating to a vacuum degree of ≤30 Pa; the temperature of the substrate is 200-300°C; 18 The powder is heated to a molten state.

[0066] Preferably, the material of the substrate includes quartz or high-boron glass.

[0067] In a fifth aspect, the present invention provides an application of a low-dimensional halide scintillating material based on rare earth cluster enhancement in X-ray detection, gamma-ray detection and particle detection, including applications in medical imaging, security inspection, oil well exploration and industrial detection.

[0068] Beneficial effects:

[0069] In the present invention, the low-dimensional halide scintillating material based on rare earth cluster enhancement has the advantages of non-(weak) deliquescent, high ionizing radiation luminescence efficiency, no scintillation luminescence self-absorption, high light output, low afterglow, high energy resolution, etc., and can be used for detecting X-rays, gamma rays and other rays or particle detection, and has important application prospects in the fields of medical imaging, security inspection, oil well exploration and industrial detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 This is the ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillating material prepared in Example 1;

[0071] Figure 2 This is the ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillation material prepared in Example 2;

[0072] Figure 3 This is the ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillating material prepared in Example 3;

[0073] Figure 4This is the ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillating material prepared in Example 5;

[0074] Figure 5 This is the ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillating material prepared in Example 6;

[0075] Figure 6 A comparison chart of ionizing radiation luminescence spectra of the rare earth cluster-enhanced low-dimensional scintillation materials of Example 6 and Example 3;

[0076] Figure 7 The ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillation material of Comparative Example 1;

[0077] Figure 8 The low-dimensional scintillating material Rb8CuSc3Cl enhanced by the rare earth cluster in Comparative Example 1 18 Compared with the rare earth cluster-enhanced low-dimensional scintillating material Cs8CuSc3Cl in Example 2 18 Comparative ionizing radiation luminescence spectra;

[0078] Fig. 9 The low-dimensional scintillating material Rb8CuY3Cl enhanced by the rare earth cluster in Comparative Example 2 18 Compared with the rare earth cluster-enhanced low-dimensional scintillating material Cs8CuY3Cl in Example 1 18 Comparative ionizing radiation luminescence spectra;

[0079] Fig.10 The rare earth zero-dimensional structure Cs3YCl6 in Comparative Example 3 and the rare earth cluster enhanced low-dimensional scintillating material Cs8CuY3Cl in Example 1 18 Comparative ionizing radiation luminescence spectra.

[0080] Fig.11 The rare earth zero-dimensional structure Cs3YCl6 in Comparative Example 3 and the rare earth cluster enhanced low-dimensional scintillating material Cs8CuY3Cl in Example 1 18 Powder XRD diffraction pattern of .

[0081] Fig.12 The rare earth zero-dimensional structure Cs3YCl6 in Comparative Example 3 and the rare earth cluster enhanced low-dimensional scintillating material Cs8CuY3Cl in Example 1 18 Comparison of local crystal structures. DETAILED DESCRIPTION

[0082] The present invention is further illustrated by specific examples below. These examples are exemplary and are intended to illustrate the problem and explain the present invention, but are not intended to be limiting.

[0083] In the present disclosure, the low-dimensional halide scintillating material based on rare earth cluster enhancement has the following general formula: A8BC3X 18 ; Wherein: A is selected from one or more elements of Cs, In and Tl, B is selected from one or more elements of Cu, Ag, Au, In and Tl, and A and B are different elements; C is selected from one or more rare earth elements of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu; X is selected from one or more halogen elements of F, Cl, Br and I. In an optional embodiment, the morphology of the low-dimensional halide scintillating material enhanced by rare earth clusters includes: bulk single crystals, powders and polycrystalline thin films.

[0084] When the low-dimensional halide scintillating material based on rare earth cluster enhancement is a bulk single crystal, the preparation method thereof is exemplarily described below. In the present invention, a crucible descent method can be used to prepare a bulk single crystal. The following only selects the crucible descent method as an example to describe its preparation process in detail, and other crystal preparation methods are also applicable to the present invention.

[0085] According to the general formula A8BC3X 18 Weigh each raw material and mix them thoroughly. In an inert dry gas environment, place the raw materials in a quartz crucible with a capillary structure; evacuate the crucible to vacuum (about 10 -2 ~10 -7 Pa) and weld it.

[0086] In an optional embodiment, the raw material is one or more of high-purity (≥99.9%), anhydrous AX, BX, CX3, wherein: A = Cs, In and Tl; B = Cu, Ag, Au, In and Tl; C = La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu; X = F, Cl, Br and I. The inert dry gas environment is a glove box filled with dry argon or nitrogen.

[0087] The welded quartz crucible is vertically placed in the middle of a crystal growth furnace; the crystal growth furnace is heated to a temperature exceeding the melting point of the raw material with the highest melting point, and the temperature is maintained until the raw material is completely melted and evenly mixed; the position of the crucible and the furnace temperature are adjusted to reduce the temperature at the bottom of the crucible capillary structure to about the melting point of the scintillation crystal; the growth temperature gradient of the growth furnace is ensured to be about 5 to 50°C / cm, and the quartz crucible is lowered in the furnace body at a descending speed of 0.01 to 10.0 mm / h; the crystal in the growth furnace begins to nucleate and grow from the bottom of the crucible capillary structure until the melt is completely solidified.

[0088] After the growth is completed, the growth furnace is cooled to room temperature at a cooling rate of 0.5 to 50° C. / h; finally, the prepared crystal is taken out from the quartz crucible.

[0089] When the rare earth cluster-enhanced low-dimensional halide scintillating material is a powder, the preparation method thereof is exemplarily described below.

[0090] According to the general formula A8BC3X 18 Weigh each raw material and mix them thoroughly. In an inert dry gas environment, place each raw material in a quartz tube, then evacuate the crucible and seal it with welding. Heat the crucible to above the melting point of each raw material until the raw materials are completely melted and mixed evenly, then cool it down to synthesize uniform A8BC3X 18 Powder.

[0091] In an optional embodiment, the raw material is one or more of high-purity (≥99.9%), anhydrous AX, BX, CX3, wherein: Cs, In and Tl; B = Cu, Ag, Au, In and Tl; C = La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu; X = F, Cl, Br and I. The inert dry gas environment is a glove box filled with dry argon or nitrogen.

[0092] When the low-dimensional halide scintillating material based on rare earth cluster enhancement is a polycrystalline thin film, the preparation method thereof is exemplarily described below. In the present invention, a single-source evaporation method can be used to prepare the polycrystalline thin film. The following only selects the single-source evaporation method as an example to describe its preparation process in detail, and other thin film preparation methods are also applicable to the present invention.

[0093] According to the general formula A8BC3X 18 Weigh each raw material and mix them thoroughly. In an inert dry gas environment, place each raw material in a quartz tube, then evacuate the crucible and seal it with welding. Heat the crucible to above the melting point of each raw material until the raw materials are completely melted and mixed evenly, then cool it down to synthesize uniform A8BC3X 18 Polycrystalline compound raw materials. In an optional embodiment, the raw materials are one or more of high-purity (≥99.9%), anhydrous AX, BX, CX3, wherein: A = Cs, In and Tl; B = Cu, Ag, Au, In and Tl; C = La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Y and Lu; X = F, Cl, Br and I. The inert dry gas environment is a glove box filled with dry argon or nitrogen.

[0094] The quartz plate or other material substrate used as the coating substrate is cleaned by ultrasonic cleaning with deionized water, alcohol and acetone for more than 20 minutes and dried, and the synthesized polycrystalline compound raw material is ground into powder or small particles (hereinafter referred to as the coating material).

[0095] The cleaned substrate is mounted on the vacuum coating device, and the synthesized coating material is weighed and loaded into a tungsten boat or molybdenum boat of corresponding volume. 18 Polycrystalline compound raw materials.

[0096] Evacuate the vacuum coating device to 10 -4 Pa, and at the same time, the substrate can be heated to 200-300℃ to ensure the quality of microcrystalline growth, and the coating process can be started. The coating material is heated to a molten state or a near-molten state by electric current heating or other heating methods. At this time, the vacuum degree in the coating device will be significantly reduced, and the coating material evaporation and A8BC3X will begin. 18 Growth of microcrystalline thin films.

[0097] When the vacuum degree in the coating device rises to the level before coating, the coating is finished. The heating device is turned off and the device is cooled to obtain A8BC3X. 18 Microcrystalline film.

[0098] The following further examples are given to illustrate the present invention in detail. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention belong to the scope of protection of the present invention. The specific process parameters and the like in the following examples are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not limited to the specific values ​​​​exemplified below.

[0099] Embodiment 1:

[0100] The rare earth cluster-enhanced low-dimensional scintillating material proposed in Example 1 is in the form of a block single crystal and has a chemical formula of Cs8CuY3Cl 18 , that is, A8BC3X 18 The general formula is: A= Cs; B= Cu; C= Y; X= Cl. The above-mentioned block single crystal is prepared by the crucible descent method, which includes the following steps:

[0101] a) Halide scintillating material prepared on demand with chemical formula Cs8CuY3Cl 18 The molar ratio of the raw materials CsCl, CuCl and YCl3 with a purity of 99.9% were weighed respectively;

[0102] b) In an inert gas environment, place the raw materials in a round-bottomed quartz crucible; then evacuate the crucible and seal it with welding. The inert gas environment is a glove box filled with argon or nitrogen;

[0103] c) Place the sealed quartz crucible vertically in the middle of the crystal growth furnace; heat the crystal growth furnace to about 950 °C until the raw materials are completely melted and mixed evenly; adjust the crucible position and furnace temperature to reduce the temperature of the crucible capillary bottom to about 580 °C, and then lower the quartz crucible in the furnace at a descending speed of 0.5 mm / h. The crystal begins to nucleate and grow from the capillary bottom of the crucible until the melt is completely solidified; then cool it down at a rate of 10 °C / h until it reaches room temperature; finally, take out the prepared halide scintillation crystal from the quartz crucible in a dry environment and process it. The obtained halide scintillation crystal can be used to detect X-rays, gamma rays and other rays or particle detection fields.

[0104] Figure 1 This is the ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillation material of Example 1. Figure 1 As shown, Cs8CuY3Cl 18 It exhibits bright ionizing radiation luminescence under radiation, with the main peak at 490 nm. The spectrum of the ionizing radiation luminescence spectrum is smooth and has no burrs, indicating that it can produce efficient ionizing radiation luminescence; the main peak is at 490nm, indicating that it can match mainstream commercial photomultiplier tubes and silicon-based detectors and other optoelectronic devices.

[0105] Embodiment 2:

[0106] The rare earth cluster-enhanced low-dimensional scintillating material proposed in Example 2 is in the form of a bulk single crystal and has a chemical formula of Cs8CuSc3Cl 18 , that is, A8BC3X 18 The general formula is: A= Cs; B= Cu; C= Sc; X= Cl. The above-mentioned block single crystal is prepared by the crucible descent method, which includes the following steps:

[0107] a) Halide scintillating material prepared on demand with chemical formula Cs8CuSc3Cl 18 The molar ratio of the raw materials CsCl, CuCl and ScCl3 with a purity of 99.9% were weighed respectively;

[0108] b) In an inert gas environment, place the raw materials in a round-bottomed quartz crucible; then evacuate the crucible and seal it with welding. The inert gas environment is a glove box filled with argon or nitrogen;

[0109] c) Place the welded quartz crucible vertically in the middle of the crystal growth furnace; heat the crystal growth furnace to about 930 °C until the raw materials are completely melted and mixed evenly; adjust the crucible position and furnace temperature to reduce the temperature of the bottom of the crucible to about 550 °C, and then lower the quartz crucible in the furnace at a descending speed of 0.6 mm / h. The crystal begins to nucleate and grow from the capillary bottom of the crucible until the melt is completely solidified; then cool it at a rate of 11 °C / h until it reaches room temperature; finally, take out the prepared halide scintillation crystal from the quartz crucible in a dry environment and process it. The obtained halide scintillation crystal can be used to detect X-rays, gamma rays and other rays or particle detection fields.

[0110] Figure 2 This is the radiant luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillation material of Example 2. Figure 2 As shown, Cs8CuSc3Cl 18 It exhibits bright ionizing radiation luminescence under ionizing radiation, with the main peak at 540 nm. The spectrum of the ionizing radiation luminescence spectrum is smooth and has no burrs, indicating that it can produce efficient ionizing radiation luminescence; the main peak is at 540 nm, indicating that it can match mainstream commercial silicon-based detectors and other optoelectronic devices.

[0111] Embodiment 3:

[0112] The present embodiment 3 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a block single crystal and has a chemical formula of Cs8CuLu3Cl 18 , that is, A8BC3X 18 The general formula is: A= Cs; B= Cu; C= Lu; X= Cl. The above-mentioned block single crystal is prepared by the crucible descent method, which includes the following steps:

[0113] a) Halide scintillating materials prepared on demand with chemical formula Cs8CuLu3Cl 18 The molar ratio of each raw material is 99.9% high purity, namely CsCl, CuCl and LuCl3;

[0114] b) In an inert gas environment, place the raw materials in a round-bottomed quartz crucible; then evacuate the crucible and seal it with welding. The inert gas environment is a glove box filled with argon or nitrogen;

[0115] c) Place the welded quartz crucible vertically in the middle of the crystal growth furnace; heat the crystal growth furnace to about 920 °C until the raw materials are completely melted and mixed evenly; adjust the crucible position and furnace temperature to reduce the temperature of the bottom of the crucible to about 550 °C, and then lower the quartz crucible in the furnace at a descending speed of 0.7 mm / h. The crystal begins to nucleate and grow from the capillary bottom of the crucible until the melt is completely solidified; then cool it at a rate of 12 °C / h until it reaches room temperature; finally, take out the prepared halide scintillation crystal from the quartz crucible in a dry environment and process it. The obtained halide scintillation crystal can be used to detect X-rays, gamma rays and other rays or particle detection fields.

[0116] Figure 3 This is the ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillation material of Example 3. Figure 3 As shown, Cs8CuLu3Cl 18 It exhibits bright radiative luminescence under radiation, with the main luminescent peak at 430 nm. The spectrum of the ionizing radiation luminescence spectrum is smooth and has no burrs, indicating that it can produce efficient ionizing radiation luminescence; the main peak is at 430 nm, indicating that it can match mainstream commercial photomultiplier tubes and silicon-based detectors and other optoelectronic devices.

[0117] Embodiment 4:

[0118] The rare earth cluster-enhanced low-dimensional scintillating material proposed in Example 4 is in the form of a block single crystal, and its chemical formula is Cs8CuSc3Br 18 , that is, A8BC3X 18 The general formula is: A = Cs; B = Cu; C = Sc; X = Br. The above-mentioned block single crystal is prepared by the crucible descent method, which includes the following steps:

[0119] a) Halide scintillating material prepared on demand with chemical formula Cs8CuSc3Br 18 The molar ratio of each raw material is 99.9% high purity CsBr, CuBr and ScBr3 respectively;

[0120] b) In an inert gas environment, place the raw materials in a round-bottomed quartz crucible; then evacuate the crucible and seal it with welding. The inert gas environment is a glove box filled with argon or nitrogen;

[0121] c) Place the welded quartz crucible vertically in the middle of the crystal growth furnace; heat the crystal growth furnace to about 915 °C until the raw materials are completely melted and mixed evenly; adjust the crucible position and furnace temperature to reduce the temperature of the bottom of the crucible to about 545 °C, and then lower the quartz crucible in the furnace at a descending speed of 0.8 mm / h. The crystal begins to nucleate and grow from the capillary bottom of the crucible until the melt is completely solidified; then cool it at a rate of 13 °C / h until it reaches room temperature; finally, take out the prepared halide scintillation crystal from the quartz crucible in a dry environment and process it. The obtained halide scintillation crystal can be used to detect X-rays, gamma rays and other rays or particle detection fields.

[0122] Embodiment 5:

[0123] The embodiment 5 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a block single crystal and has a chemical formula of Cs8CuLu3Br 18 , that is, A8BC3X 18 The general formula is: A = Cs; B = Cu; C = Lu; X = Br. The above-mentioned block single crystal is prepared by the crucible descent method, which includes the following steps:

[0124] a) The chemical formula of the halide scintillating material prepared on demand is Cs8CuLu3Br 18 The molar ratio of the raw materials CsBr, CuBr and LuBr3 with a purity of 99.9% were weighed respectively;

[0125] b) In an inert gas environment, place the raw materials in a round-bottomed quartz crucible; then evacuate the crucible and seal it with welding. The inert gas environment is a glove box filled with argon or nitrogen;

[0126] c) Place the welded quartz crucible vertically in the middle of the crystal growth furnace; heat the crystal growth furnace to about 910 °C until the raw materials are completely melted and mixed evenly; adjust the crucible position and furnace temperature to reduce the temperature of the bottom of the crucible to about 560 °C, and then lower the quartz crucible in the furnace at a descending speed of 0.8 mm / h. The crystal begins to nucleate and grow from the capillary bottom of the crucible until the melt is completely solidified; then cool it at a rate of 14 °C / h until it reaches room temperature; finally, take out the prepared halide scintillation crystal from the quartz crucible in a dry environment and process it. The obtained halide scintillation crystal can be used to detect X-rays, gamma rays and other rays or particle detection fields.

[0127] Figure 4 This is the ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillation material of Example 5. Figure 4 As shown, Cs8CuLu3Br 18It exhibits bright radiative luminescence under radiation, with the main luminescent peak at 600 nm. The spectrum of the ionizing radiation luminescence spectrum is smooth and has no burrs, indicating that it can produce efficient ionizing radiation luminescence; the main peak is at 600nm, indicating that it can match the mainstream commercial photomultiplier tubes and silicon-based detectors and other optoelectronic devices.

[0128] Embodiment 6:

[0129] The embodiment 6 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a block single crystal and has a chemical formula of Rb8CuLu3Cl 18 , that is, A8BC3X 18 The general formula is: A = Rb; B = Cu; C = Lu; X = Cl. The above-mentioned block single crystal is prepared by the crucible descent method, which includes the following steps:

[0130] a) Halide scintillating materials prepared on demand with chemical formula Rb8CuLu3Cl 18 The molar ratio of the raw materials RbCl, CuCl and LuCl3 with a purity of 99.9% were weighed respectively;

[0131] b) In an inert gas environment, place the raw materials in a round-bottomed quartz crucible; then evacuate the crucible and seal it with welding. The inert gas environment is a glove box filled with argon or nitrogen;

[0132] c) Place the welded quartz crucible vertically in the middle of the crystal growth furnace; heat the crystal growth furnace to about 940 °C until the raw materials are completely melted and mixed evenly; adjust the crucible position and furnace temperature to reduce the temperature of the bottom of the crucible to about 580 °C, and then lower the quartz crucible in the furnace at a descending speed of 0.8 mm / h. The crystal begins to nucleate and grow from the capillary bottom of the crucible until the melt is completely solidified; then cool it at a rate of 14 °C / h until it reaches room temperature; finally, take out the prepared halide scintillation crystal from the quartz crucible in a dry environment and process it. The obtained halide scintillation crystal can be used to detect X-rays, gamma rays and other rays or particle detection fields.

[0133] The ionizing radiation luminescence spectrum results show that it has bright ionizing radiation luminescence, with the main luminescence peak at 490 nm. 18 Under ionizing radiation, it shows better performance than Cs8CuLu3Cl 18 Poor ionizing radiation luminescence intensity, Cs8CuLu3Cl 18 The main peak luminescence intensity is about Rb8CuLu3Cl 18 This indicates that Cs is more suitable as an A-site than Rb for applications in radiation detection and other fields.

[0134] Figure 5 This is the ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillation material of Example 6. Figure 5 As shown, Rb8CuLu3Cl 18 It exhibits bright radiant luminescence under radiation, with the main luminescence peak at 490 nm. Figure 6 This is a comparison of the ionizing radiation luminescence spectra of the rare earth cluster-enhanced low-dimensional scintillation materials of Example 6 and Example 3. Figure 6 As shown, Rb8CuLu3Cl 18 Under irradiation, it shows a better 18 Poor radiant luminescence intensity, Cs8CuLu3Cl 18 The main peak luminescence intensity is about Rb8CuLu3Cl 18 4.5 times of that.

[0135] Embodiment 7:

[0136] The embodiment 7 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a block single crystal and has a chemical formula of (Cs 0.6 K 0.4 )8CuY3Cl 18 The above-mentioned bulk single crystal is prepared by the crucible descent method. The specific steps are as shown in Example 1, except that: in step a), the halide scintillating material prepared as required has a chemical formula (Cs 0.6 K 0.4 )8CuY3Cl 18 The high-purity raw materials CsCl, KCl, CuCl and YCl3 with a purity of 99.99% were weighed respectively according to the molar ratio.

[0137] Embodiment 8:

[0138] The embodiment 8 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a block single crystal and has a chemical formula of Cs8 (Cu 0.4 Ag 0.6 )Y3Cl 18 The above-mentioned bulk single crystal is prepared by the crucible descent method. The specific steps are as shown in Example 1, except that: in step a), the halide scintillating material prepared on demand has a chemical formula of Cs8 (Cu 0.4 Ag 0.6 )Y3Cl 18 According to the molar ratio of , high-purity raw materials CsCl, CuCl, AgCl and YCl3 with a purity of 99.99% were weighed respectively.

[0139] Embodiment 9:

[0140] The embodiment 9 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a block single crystal and has a chemical formula of Cs8Cu(Sc 0.5 Y 0.5 )3Cl 18 The above-mentioned bulk single crystal is prepared by the crucible descent method. The specific steps are as shown in Example 1, except that: in step a), the halide scintillating material prepared on demand has a chemical formula of Cs8Cu(Sc 0.5 Y 0.5 )3Cl 18 The high-purity raw materials CsCl, CuCl, ScCl3 and YCl3 with a purity of 99.99% were weighed respectively according to the molar ratio.

[0141] Embodiment 10:

[0142] The embodiment 10 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a block single crystal and has a chemical formula of Cs8CuY3(Cl 0.8 Br 0.2 ) 18 The above-mentioned bulk single crystal is prepared by the crucible descent method. The specific steps are as shown in Example 1, except that: in step a), the halide scintillating material prepared on demand has a chemical formula of Cs8CuY3(Cl 0.8 Br 0.2 ) 18 The high-purity raw materials CsCl, CsBr, CuCl, CuBr, YCl3 and YBr3 with a purity of 99.99% were weighed respectively according to the molar ratio.

[0143] Embodiment 11:

[0144] The embodiment 11 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a polycrystalline thin film and has a chemical formula of Cs8CuY3Br 18 The polycrystalline thin film is prepared by evaporation method, which includes the following steps:

[0145] a) According to the general formula Cs8CuY3Br 18 Weigh all the raw materials and mix them thoroughly. In an inert dry gas environment, place all the raw materials in a quartz tube, then evacuate the crucible and seal it with welding. Heat the crucible to 950℃ until the raw materials are completely melted and mixed evenly, then cool it down to synthesize uniform Cs8CuY3Br 18 Polycrystalline compound raw materials;

[0146] b) The quartz plate or other substrate used as the coating substrate is cleaned by ultrasonic cleaning with deionized water, alcohol and acetone for 30 minutes and dried, and the synthesized polycrystalline compound raw material is ground into powder or small particles (hereinafter referred to as the coating material);

[0147] c) Install the cleaned substrate on the vacuum coating device, weigh the synthesized coating material and load it into a tungsten boat or molybdenum boat of corresponding volume. The single source evaporation method is adopted, that is, one boat evaporates Cs8CuY3Br 18 Polycrystalline compound raw materials;

[0148] d) Evacuate the vacuum coating device in step c) to 10 -4 Pa, and at the same time, the substrate can be heated to 250℃ to ensure the quality of microcrystalline growth, and the coating process can be started. The coating material is heated to a molten state or a near-molten state by electric current heating or other heating methods. At this time, the vacuum degree in the coating device will be significantly reduced, and the evaporation of the coating material and Cs8CuY3Br 18 Growth of microcrystalline thin films;

[0149] e) When the vacuum degree in the coating device rises to the level before coating, the coating is finished. The heating device is turned off and Cs8CuY3Br is obtained after cooling. 18 The obtained halide scintillating film can be used to detect X-rays, gamma rays and other rays or in the field of particle detection.

[0150] Embodiment 12:

[0151] The embodiment 12 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a polycrystalline thin film and has a composition chemical formula of Cs8CuSc3I 18 The polycrystalline thin film is prepared by evaporation method, which includes the following steps:

[0152] a) According to the general formula Cs8CuSc3I 18 Weigh each raw material and mix them thoroughly. In an inert dry gas environment, place each raw material in a quartz tube, then evacuate the crucible and seal it with welding. Heat the crucible to 920℃ until the raw materials are completely melted and mixed evenly, then cool it down to synthesize uniform Cs8CuSc3I 18 Polycrystalline compound raw materials;

[0153] b) The quartz plate or other material substrate used as the coating substrate is cleaned by ultrasonic cleaning with deionized water, alcohol and acetone for 35 minutes and dried, and the synthesized polycrystalline compound raw material is ground into powder or small particles (hereinafter referred to as the coating material);

[0154] c) Install the cleaned substrate on the vacuum coating device, weigh the synthesized coating material and load it into a tungsten boat or molybdenum boat of corresponding volume. The single source evaporation method is used, that is, one boat evaporates Cs8CuSc3I 18 Polycrystalline compound raw materials;

[0155] d) Evacuate the vacuum coating device in step c) to 10 -4Pa, and at the same time, the substrate can be heated to 260℃ to ensure the quality of microcrystalline growth, and the coating process can be started. The coating material is heated to a molten state or a near-molten state by electric current heating or other heating methods. At this time, the vacuum degree in the coating device will be significantly reduced, and the evaporation of the coating material and the Cs8CuSc3I 18 Growth of microcrystalline thin films;

[0156] e) When the vacuum degree in the coating device rises to the level before coating, the coating is finished. The heating device is turned off and Cs8CuSc3I is obtained after cooling. 18 The obtained halide scintillating film can be used to detect X-rays, gamma rays and other rays or in the field of particle detection.

[0157] Embodiment 13:

[0158] The rare earth cluster-enhanced low-dimensional scintillating material proposed in Example 13 is in the form of powder, and its chemical formula is Cs8CuSc3I 18 The above powder is prepared by solid phase reaction method, including the following steps: 18 Weigh each raw material and mix them thoroughly. In an inert dry gas environment, place each raw material in a quartz tube, then evacuate the crucible and seal it with welding. Heat the crucible to 920℃ until the raw materials are completely melted and mixed evenly, then cool it down to synthesize uniform Cs8CuSc3I 18 Polycrystalline compound raw materials. The obtained halide scintillating powder can be used to detect X-rays, gamma rays and other rays or particle detection fields.

[0159] Embodiment 14:

[0160] The embodiment 14 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a block single crystal and has a chemical formula of In8CuSc3Cl 18 The above-mentioned bulk single crystal is prepared by the crucible descent method. The specific steps are as shown in Example 2, except that: in step a), the halide scintillating material prepared on demand has a chemical formula of In8CuSc3Cl 18 The high-purity raw materials InCl, CuCl and ScCl3 with a purity of 99.99% were weighed respectively according to the molar ratio.

[0161] Embodiment 15:

[0162] The rare earth cluster-enhanced low-dimensional scintillating material proposed in Example 15 is in the form of a block single crystal and has a chemical formula of Tl8CuSc3Cl 18 The above-mentioned bulk single crystal is prepared by the crucible descent method. The specific steps are as shown in Example 2, except that: in step a), the halide scintillating material prepared on demand has a chemical formula of Tl8CuSc3Cl 18The high-purity raw materials TlCl, CuCl and ScCl3 with a purity of 99.99% were weighed respectively according to the molar ratio.

[0163] Embodiment 16:

[0164] The embodiment 16 proposes a rare earth cluster enhanced low-dimensional scintillating material, which is in the form of a block single crystal and has a chemical formula of (In 0.9 Cs 0.1 )8CuSc3Cl 18 The above-mentioned bulk single crystal is prepared by the crucible descent method. The specific steps are as shown in Example 2, except that: in step a), the halide scintillating material prepared as required has a chemical formula (In 0.9 Cs 0.1 )8CuSc3Cl 18 The high-purity raw materials CsCl, InCl, CuCl and ScCl3 with a purity of 99.99% were weighed respectively according to the molar ratio.

[0165] Embodiment 17:

[0166] The rare earth cluster-enhanced low-dimensional scintillating material proposed in Example 17 is in the form of a block single crystal, and its chemical formula is (Tl 0.8 In 0.2 )8CuSc3Cl 18 The above-mentioned bulk single crystal is prepared by the crucible descent method. The specific steps are as shown in Example 2, except that: in step a), the halide scintillating material prepared as required has the chemical formula (Tl 0.8 In 0.2 )8CuSc3Cl 18 The high-purity raw materials TlCl, InCl, CuCl and ScCl3 with a purity of 99.99% were weighed respectively according to the molar ratio.

[0167] Comparative Example 1

[0168] The rare earth scintillating material of this comparative example 1 is in the form of a block single crystal, and its chemical formula is Rb8CuSc3Cl 18 The above-mentioned bulk single crystal is prepared by the crucible descent method. The specific steps are as shown in Example 2, except that: in step a), the halide scintillating material prepared on demand has a chemical formula of Rb8CuSc3Cl 18 The high-purity raw materials RbCl, CuCl and ScCl3 with a purity of 99.99% were weighed respectively according to the molar ratio.

[0169] Figure 7 This is the ionizing radiation luminescence spectrum of the rare earth cluster-enhanced low-dimensional scintillation material of Comparative Example 1. The ionizing radiation luminescence spectrum results show that Rb8CuSc3Cl 18It has bright radiant luminescence with the main luminescence peak at 470 nm.

[0170] Figure 8 The low-dimensional scintillating material Rb8CuSc3Cl enhanced by the rare earth cluster in Comparative Example 1 18 Compared with the rare earth cluster-enhanced low-dimensional scintillating material Cs8CuSc3Cl in Example 2 18 Comparison of ionizing radiation luminescence spectra. Figure 8 As shown, Rb8CuSc3Cl 18 Compared with Cs8CuSc3Cl under irradiation 18 exhibits poor radiative luminescence, Cs8CuSc3Cl 18 The main peak intensity is about Rb8CuSc3Cl 18 5.3 times,

[0171] Comparative Example 2

[0172] The rare earth scintillating material of this comparative example 2 is in the form of a block single crystal, and its chemical formula is Rb8CuY3Cl 18 The above-mentioned bulk single crystal is prepared by the crucible descent method. The specific steps are as shown in Example 1, except that: in step a), the halide scintillating material prepared on demand has a chemical formula of Rb8CuY3Cl 18 The high-purity raw materials RbCl, CuCl and YCl3 with a purity of 99.99% were weighed respectively according to the molar ratio.

[0173] Fig. 9 The low-dimensional scintillating material Rb8CuY3Cl enhanced by the rare earth cluster in Comparative Example 2 18 Compared with the rare earth cluster-enhanced low-dimensional scintillating material Cs8CuY3Cl in Example 1 18 Comparison of ionizing radiation luminescence spectra. Fig. 9 As shown, Rb8CuY3Cl 18 Compared with Cs8CuY3Cl under irradiation 18 exhibits poor radioluminescence, Cs8CuY3Cl 18 The main peak intensity is about Rb8CuSc3Cl 18 6.1 times of that.

[0174] Combining the test results of Comparative Example 2, Comparative Example 1 and Example 6, the general formula is A8BC3X 18 In rare earth cluster-enhanced low-dimensional scintillating materials, the effect of Rb as an A-site element is not ideal.

[0175] Comparative Example 3

[0176] The rare earth scintillating material of this comparative example 3 is in the form of a bulk single crystal, and its composition chemical formula is Cs3YCl6. The above-mentioned bulk single crystal is prepared by a crucible descent method, and the specific steps are as shown in Example 1, except that: in step a), the molar ratio of the halide scintillating material composition chemical formula Cs3YCl6 prepared as required, and high-purity raw materials CsCl and YCl3 with a purity of 99.99% are weighed respectively.

[0177] Fig.10 The rare earth zero-dimensional structure Cs3YCl6 in Comparative Example 3 and the rare earth cluster enhanced low-dimensional scintillating material Cs8CuY3Cl in Example 1 18 Comparison of ionizing radiation luminescence spectra. Fig.10 As shown, Cs8CuY3Cl 18 Under radiation, it shows bright ionizing radiation luminescence, and the main peak intensity is about 7 times that of Cs3YCl6. By comparison, it can be seen that A8BC3X 18 Rare earth enhanced low-dimensional scintillating materials have significant advantages and application potential in fields such as radiation detection.

[0178] Fig.11 The rare earth zero-dimensional structure Cs3YCl6 in Comparative Example 3 and the rare earth cluster enhanced low-dimensional scintillating material Cs8CuY3Cl in Example 1 18 Powder XRD diffraction pattern of Fig.11 The powder X-ray diffraction pattern of Cs8CuY3Cl shows that the diffraction peaks of the two are significantly different, indicating that the structures of the two are significantly different. 18 It is a brand new compound, which is essentially different from Cs3YCl6.

[0179] Fig.12 The rare earth zero-dimensional structure Cs3YCl6 in Comparative Example 3 and the rare earth cluster enhanced low-dimensional scintillating material Cs8CuY3Cl in Example 1 18 Comparison of local crystal structure diagrams. Fig.12 As shown, Cs8CuY3Cl 18 It has a paddle-shaped primitive structure, which consists of two central B-site elements connected to three surrounding ones [CX6] 3- Octahedral structure, specifically Cs8CuY3Cl 18 The material has two Cu + Connect three [YCl6] 3- Octahedron, forming a paddle-shaped elementary structure. Due to the existence of the paddle-shaped elementary structure, the carriers formed by excitation are easier to localize, thereby effectively enhancing the ionizing radiation luminescence efficiency. + Directly separate [YCl6] 3-Octahedron, there is a clear difference between the two structures. 18 The rare earth cluster enhanced low-dimensional scintillating material represented is a highly sensitive scintillating material with a brand-new structure, which is essentially different from the existing A3BX6 type STE scintillating material.

[0180] In the present invention, a tungsten target X-ray tube is used as an excitation source and a QEpro spectrometer of Ocean Optics is used as a detector to test the ionizing radiation luminescence spectrum of a low-dimensional halide scintillating material enhanced by rare earth clusters.

[0181] Finally, it is necessary to explain here that the above embodiments are only used to further illustrate the technical solution of the present invention in detail and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by technicians in this field based on the above content of the present invention all fall within the scope of protection of the present invention.

Claims

1. A low-dimensional halide scintillating material, characterized in that: The chemical formula is: Cs8CuLu3Cl 18 .

2. A low-dimensional halide scintillating material, characterized in that: The chemical formula is: Cs8CuY3Cl 18 or Cs8CuSc3Cl 18 .

3. The low-dimensional halide scintillation material according to claim 1 or 2, characterized in that: The low-dimensional halide scintillating material is in the form of a bulk single crystal, and the size of the bulk single crystal in at least one dimension is not less than 1 mm; or The low-dimensional halide scintillating material is in the form of powder, and the particle size of the powder is in the range of 1 nm to 20 μm; or The low-dimensional halide scintillating material is in the form of a polycrystalline film, and the thickness of the polycrystalline film is 1 μm to 1000 μm.

4. A method for preparing a low-dimensional halide scintillating material, characterized in that: The material is the low-dimensional halide scintillation material according to claim 1 or 2, the material is in the form of a bulk single crystal, and the preparation method comprises the following steps: (1) According to the chemical formula of low-dimensional halide scintillating materials A8BC3X 18 Weigh AX powder, BX powder and CX3 powder as raw powders, place the raw powders in a quartz crucible with a capillary structure, and evacuate the air to a pressure of ≤10 -2 Pa, and weld and seal; (2) Place the sealed quartz crucible vertically in a crystal growth furnace, then heat it to the highest melting point of the raw material and keep it warm so that the raw material powder is completely melted and mixed evenly; (3) adjusting the position of the quartz crucible and / or the furnace temperature so that the temperature at the bottom of the capillary structure of the quartz crucible is maintained between the melting point of the low-dimensional halide scintillating material ±10 °C; (4) Controlling the growth temperature gradient of the crystal growth furnace to 5 to 50°C / cm, and then lowering the quartz crucible in the furnace body at a descending speed of 0.01 to 10.0 mm / h to start crystal growth; (5) After the growth is completed, cool down to room temperature at a rate of 0.5 to 50°C / h.

5. A method for preparing a low-dimensional halide scintillating material, characterized in that: The material is the low-dimensional halide scintillation material according to claim 1 or 2, the material is in the form of powder, and the preparation method comprises the following steps: (1) According to the chemical formula of low-dimensional halide scintillating materials A8BC3X 18 Weigh AX powder, BX powder and CX3 powder as raw material powders, and then place them in a quartz tube and evacuate them to a pressure of ≤10 -2 Pa, and weld and seal; (2) The welded quartz tube is heat-treated at 400-1100° C. for 1-10 hours until the raw materials are completely melted and mixed evenly, and then cooled to obtain a powdered low-dimensional halide scintillating material.

6. A method for preparing a low-dimensional halide scintillating material, characterized in that: The material is the low-dimensional halide scintillation material according to claim 1 or 2, the material is in the form of a polycrystalline thin film, and the preparation method comprises the following steps: (1) According to the chemical formula of low-dimensional halide scintillating materials A8BC3X 18 Weigh AX powder, BX powder and CX3 powder and mix them as raw powder, then place them in a quartz tube and evacuate them to a pressure of ≤10 -2 Pa, and weld and seal; (2) Heat the sealed quartz tube at 400-1100°C for 1-10 hours to obtain A8BC3X 18 Powder; (3) A8BC3X was evaporated by single source evaporation method 18 The powder is coated on the surface of the substrate to obtain a low-dimensional halide scintillation material.

7. An application of a low-dimensional halide scintillating material, characterized in that: The material is the low-dimensional halide scintillation material according to claim 1 or 2, and the material is used in X-ray detection, gamma-ray detection or particle detection.

8. An application of a low-dimensional halide scintillating material, characterized in that: The material is the low-dimensional halide scintillation material according to claim 1 or 2, and the material is used in medical imaging, security inspection, oil well exploration or industrial detection.

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