Imaging application of pyrazolyl copper ring trinuclear scintillator

Abstract

The embodiment of the invention discloses imaging application of a pyrazolyl copper ring trinuclear scintillator, relates to the technical field of metal-organic complex luminescent materials, is used for preparing a scintillation screen material for X-ray imaging, and aims to make up for the defects of an existing scintillator material in practical application.

Description

Technical Field

[0001] The present application relates to the technical field of metal-organic complex luminescent materials, and in particular to the imaging application of pyrazolyl copper ring trinuclear scintillators. Background Art

[0002] Due to their strong penetrating properties, X-rays have become an indispensable technology in fields such as industrial nondestructive testing (such as material defect analysis), public safety inspections, and medical imaging diagnostics. Scintillators, the core conversion material in X-ray detectors, can convert high-energy X-ray photons into ultraviolet / visible light signals, which can then be detected by conventional photoelectric sensors. Compared to complex direct detectors that require direct "X-ray-to-electron" conversion, indirect detection technology based on scintillators offers significant practical advantages.

[0003] However, existing scintillator material systems have significant drawbacks. Traditional inorganic scintillators rely on high-temperature sintering processes, contain toxic heavy metals such as lead and cadmium, and are expensive to manufacture. Furthermore, new scintillators often suffer from low light yield, poor environmental stability, complex synthesis processes, high costs, and residual toxic elements, severely restricting their industrial application. Summary of the Invention

[0004] The main purpose of this application is to provide an imaging application of a pyrazolyl copper ring trinuclear scintillator, aiming to make up for the shortcomings of existing scintillator materials when put into practical application.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:

[0006] In a first aspect, embodiments of the present application provide imaging applications of a pyrazolyl copper ring trinuclear scintillator, wherein the pyrazolyl copper ring trinuclear scintillator is used to prepare a scintillating screen material for X-ray imaging.

[0007] As some optional embodiments of the present application, the pyrazolyl copper ring trinuclear scintillator is used to prepare a scintillating screen material for medical imaging.

[0008] As some optional embodiments of the present application, the pyrazolyl copper ring trinuclear scintillator is used to prepare a scintillating screen material for simulating X-ray dynamic angiography.

[0009] As some optional embodiments of the present application, the pyrazolyl copper ring trinuclear scintillator is used to prepare a security detection imaging scintillating screen material.

[0010] As some optional embodiments of the present application, the scintillating screen material is prepared by the following steps:

[0011] Polymethyl methacrylate and CuCTC were mixed and added to dichloromethane. After stirring evenly at a preset temperature, the mixture was cast on a silicone mold and air-dried to obtain a CuCTC scintillator screen.

[0012] As some optional embodiments of the present application, the mixing mass ratio of the polymethyl methacrylate to the CuCTC is about 1:1.

[0013] As some optional embodiments of the present application, the mixing volume ratio of the dichloromethane to the polymethyl methacrylate is about 5:1.

[0014] As some optional implementations of the present application, the preset temperature is 35° C., and the stirring time is 5 min-30 min.

[0015] As some optional embodiments of the present application, the light yield of the pyrazolyl copper ring trinuclear scintillator can reach 70475 photons / MeV.

[0016] As some optional embodiments of the present application, the photoluminescence quantum yield of the pyrazolyl copper ring trinuclear scintillator can reach 75.62%.

[0017] Compared with the prior art, the present application discloses the imaging application of the pyrazolyl copper ring trinuclear scintillator, that is, the pyrazolyl copper ring trinuclear scintillator is used to prepare a scintillating screen material for X-ray imaging. Specifically, it includes: using the pyrazolyl copper ring trinuclear scintillator to prepare a scintillating screen material for medical imaging, such as using the pyrazolyl copper ring trinuclear scintillator to prepare a scintillating screen material for simulated X-ray dynamic vascular imaging. Another example is using the pyrazolyl copper ring trinuclear scintillator to prepare a scintillating screen material for security detection imaging. The light yield of the pyrazolyl copper ring trinuclear scintillator described in the present application can reach 70475photons / MeV, and the photoluminescence quantum yield of the pyrazolyl copper ring trinuclear scintillator can reach 75.62%, thereby making it better suitable for more industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the structural formula and corresponding abbreviation of a representative CuCTC;

[0019] Figure 2 This is a microscopic photograph of CuCTC single crystals obtained in this application example. The resulting CuCTC product is either bulk or fibrous single crystals. The scale bar is 500 μm (photographed using a fluorescence microscope with a 5x objective and a 10x eyepiece).

[0020] Figure 3 The single synthesis yield of a single hydrothermal reactor is as high as 2.3 g for (Me-Me)Pz-Cu, with a yield of 87% (calculated as copper element).

[0021] Figure 4 The X-ray powder diffraction spectrum of CuCTC involved in the embodiments of the present application; sub-figure a represents the X-ray powder diffraction spectrum of (Me-Me)Pz-Cu, sub-figure b represents the X-ray powder diffraction spectrum of (Br-Me)Pz-Cu, sub-figure c represents the X-ray powder diffraction spectrum of (Br-Br)Pz-Cu, sub-figure d represents the X-ray powder diffraction spectrum of (Br-Br-Br)Pz-Cu, and sub-figure e represents the X-ray powder diffraction spectrum of (I-Me)Pz-Cu;

[0022] Figure 5 The embodiments of this application relate to the photoluminescence excitation spectrum and emission spectrum of CuCTC; Figure 6 Comparison of the photoluminescence properties of CuCTC involved in the embodiments of this application; sub-graph a represents the normalized emission spectrum, λ ex = 310 nm; subgraph b shows the normalized excitation spectra, λ of (Me-Me)Pz-Cu, (Br-Me)Pz-Cu and (Br-Br)Pz-Cu em They are 625nm, 635nm and 625nm respectively; sub-graph c represents the CIE color coordinates;

[0023] Figure 7 This is a photoluminescence lifetime decay spectrum of CuCTC related to an embodiment of the present application;

[0024] Figure 8 The photoluminescence quantum yield of CuCTC involved in the embodiment of the present application; sub-graph a represents (Me-Me)Pz-Cu; sub-graph b represents (Br-Br)Pz-Cu; sub-graph c represents (Br-Br)Pz-Cu;

[0025] Figure 9 Figure 1 is a graph of absorption coefficient and attenuation efficiency involved in the embodiments of the present application; sub-graph a shows the absorption coefficient graph; sub-graph b shows the relationship between attenuation efficiency and thickness; X-ray radiation is generated by a metal tungsten target with an excitation energy of 8 keV;

[0026] Figure 10 Figure 1 is a radioluminescence characterization of CuCTC involved in the embodiments of the present application; wherein, sub-figure a shows photographs of solid-state CuCTC under natural light, ultraviolet light, and X-rays; sub-figure b shows the RL spectrum of CuCTC; sub-figure c shows the comparison of the light yield of CuCTC and commercial scintillators; sub-figure d shows the stability evaluation of RL intensity (X-ray dose rate is 705 μGy air / s, for 30 minutes); Subfigure e shows the linear fit between X-ray dose rate and RL intensity; Subfigure f shows the comparison between the photoluminescence quantum yield and light yield of CuCTC;

[0027] Figure 11 The present invention relates to the luminescence spectra of CuCTC and the commercial scintillator cerium-doped lutetium aluminum garnet (LuAG(Ce)) obtained under the same measurement conditions. Comparing the emission peak area of CuCTC with that of LuAG(Ce), it can be inferred that the light yields of (Me-Me)Pz-Cu, (Br-Me)Pz-Cu, (Br-Br)Pz-Cu, (Br-Br-Br)Pz-Cu, and (I-Me)Pz-Cu are 70,475 photons / MeV, 31,257 photons / MeV, 23,761 photons / MeV, 1,635 photons / MeV, and 8,155 photons / MeV, respectively. X-ray tube parameters: tungsten target, 50 kV, 20 μA; sample thickness 1 mm;

[0028] Figure 12 RL data diagram under different X-ray dose rates involved in the embodiments of the present application;

[0029] Figure 13 is a linear regression curve of X-ray dose rate and RL intensity involved in the embodiment of the present application;

[0030] Figure 14 This is a photo of the (Me-Me)Pz-Cu scintillation screen involved in the embodiments of the present application;

[0031] Figure 15 This is a dynamic X-ray imaging based on a CuCTC scintillating screen according to an embodiment of the present application; wherein, sub-figure a shows a photograph of the (Me-Me)Pz-Cu scintillating screen under ultraviolet light (254 nm) and a schematic diagram of a homemade X-ray imaging system; sub-figures b to e show the bright field (top) and X-ray (bottom) images of (b) a cross-body bag, (c) a pill encapsulating a metal spring, (d) a crab, and (e) a resolution standard ruler, respectively; sub-figure f shows a simulation of real-time angiography using the (Me-Me)Pz-Cu scintillating screen; sub-figure g shows the (Me-Me)Pz-Cu scintillating screen under X-ray (dose rate: 705 μGy air / s) under stability evaluation; sub-graph h represents the comprehensive performance evaluation of CuCTC;

[0032] Figure 16 This is the X-ray spatial resolution MTF distribution of the (Me-Me)Pz-Cu scintillator screen involved in the embodiments of the present application. DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0034] As mentioned above, X-rays, due to their strong penetrating properties, have become an indispensable technology in fields such as industrial nondestructive testing (such as material defect analysis), public safety inspections, and medical imaging diagnostics. Scintillators, the core conversion material in X-ray detectors, convert high-energy X-ray photons into ultraviolet / visible light signals, which can then be detected by conventional photoelectric sensors. Compared to complex direct detectors that require direct "X-ray-to-electron" conversion, indirect detection technology based on scintillators offers significant practical advantages.

[0035] However, existing scintillator material systems have significant drawbacks. Traditional inorganic scintillators rely on high-temperature sintering processes, contain toxic heavy metals such as lead and cadmium, and are expensive to manufacture. Furthermore, new scintillators often suffer from low light yield, poor environmental stability, complex synthesis processes, high costs, and residual toxic elements, severely restricting their industrial application.

[0036] Based on this, the present application proposes a series of scintillator materials based on pyrazolyl copper ring trinuclear metal-organic complexes and their preparation methods. Compared with existing scintillator materials, the scintillator materials obtained by the preparation method of the present application have a light yield of up to 70475photons / MeV and a photoluminescence quantum yield of 75.62%, and have good irradiation stability and a fast scintillation speed, and can be used in dynamic X-ray imaging; in addition, the preparation method described in the present application synthesizes the scintillator material in one step at 120℃-150℃, and no toxic heavy metals are involved in the preparation process, and the production cost is low; it can be seen that the preparation method described in the present application has significant application value in scenarios such as medical CT and security detection.

[0037] When scintillator materials are used in scenarios such as medical CT and security testing, large-area scintillator screens need to be prepared, which in turn requires a large amount of scintillator material. Based on this, the present application provides a method for mass production of pyrazolyl copper trinuclear single crystals, aiming to develop an efficient, inexpensive, large-scale method for synthesizing pyrazolyl copper trinuclear single crystals. The mass production method comprises the following steps:

[0038] Step S10: Charge the pyrazolyl ligand, copper acetate monohydrate, and ethanol into a hydrothermal reactor in a preset ratio, dissolve them by ultrasonication, and then place them in an oven at 120°C-150°C for reaction. Preferably, the preset ratio is: 15 mmol-20 mmol pyrazolyl ligand: 15 mmol-20 mmol copper acetate monohydrate: 150 ml-200 ml ethanol. More preferably, the preset ratio is: 16 mmol-18 mmol pyrazolyl ligand: 16 mmol-18 mmol copper acetate monohydrate: 150 ml-180 ml ethanol. Most preferably, the preset ratio is: 17 mmol pyrazolyl ligand: 17 mmol copper acetate monohydrate: 160 ml ethanol. Preferably, the reaction time in the oven at 120°C-150°C is 70 h-75 h.

[0039] Step S20: After the reaction is completed, filtering, washing and drying are performed in sequence to obtain a white single crystal product, which is a pyrazolyl copper trinuclear single crystal.

[0040] The general structural formula of the pyrazolyl copper trinuclear single crystal (also referred to as pyrazolyl copper ring trinuclear single crystal, both referring to the same thing) is as follows:

[0041]

[0042] Wherein, R1, R2 and R3 are all substituents; the substituents include at least one of a hydrogen atom, a hydrocarbon group, an aromatic group, a halogen and a trifluoromethyl group.

[0043] Preferably, the pyrazolyl copper trinuclear single crystal is (Me-Me)Pz-Cu, and its structural formula is as follows:

[0044]

[0045] Preferably, the pyrazolyl copper trinuclear single crystal is (Br-Me)Pz-Cu, and its structural formula is as follows:

[0046]

[0047] Preferably, the pyrazolyl copper trinuclear single crystal is (I-Me)Pz-Cu, and its structural formula is as follows:

[0048]

[0049] As shown in the attached picture Figure 1As shown, the resulting series of pyrazolyl copper trinuclear complexes are named (Me-Me)Pz-Cu, (Br-Me)Pz-Cu, (Br-Br)Pz-Cu, (Br-Br-Br)Pz-Cu, and (I-Me)Pz-Cu. (Br-Me)Pz-Cu and (I-Me)Pz-Cu are reported for the first time. Their crystallographic data are available at the Cambridge Crystallographic Data Center under reference numbers CCDC2417111 and 2431879, respectively.

[0050] These CuCTC single crystals can be prepared in large quantities through a simple one-pot synthesis method using only ethanol as solvent, ensuring ease of operation and environmental friendliness. Figure 2 As shown, these crystalline products formed block or needle-shaped single crystals with diameters of about 100 to 400 μm. Under solid-state conditions at room temperature, ultraviolet excitation can cause CuCTC to produce bright luminescence, exhibiting aggregation-induced emission (AIE) characteristics. Through efficient, large-scale one-pot preparation, more than 2.3g of product can be obtained in a single reaction with a yield of up to 87% ( Figure 3 The phase purity of these CuCTCs was confirmed by X-ray powder diffraction (PXRD) spectra ( Figure 4 ).

[0051] Steady-state photoluminescence analysis was used to study the photophysical properties of CuCTC ( Figure 5 A broad emission band of CuCTC photoluminescence spectrum can be observed at 570-640 nm, and its excitation peaks are all located below 350 nm ( Figure 6 Time-resolved photoluminescence (TRPL) analysis showed that the lifetimes of (Me-Me)Pz-Cu, (Br-Me)Pz-Cu, and (Br-Br)Pz-Cu were 40.61μs, 29.80μs, and 25.55μs, respectively. Figure 7 Compared with Table 1). The microsecond lifetime indicates phosphorescence. In addition, the photoluminescence quantum yields (PLQY) of (Me-Me)Pz-Cu, (Br-Me)Pz-Cu and (Br-Br)Pz-Cu are 78.88%, 90.76% and 83.69% respectively. Figure 8 and Table 1).

[0052] Table 1:

[0053]

[0054] On the other hand, embodiments of the present application also provide imaging applications of the pyrazolyl copper ring trinuclear scintillator, namely, using the pyrazolyl copper ring trinuclear scintillator to prepare a scintillating screen material for X-ray imaging. Specifically, this includes using the pyrazolyl copper ring trinuclear scintillator to prepare a scintillating screen material for medical imaging, such as using the pyrazolyl copper ring trinuclear scintillator to prepare a scintillating screen material for simulated X-ray dynamic vascular imaging. Another example is using the pyrazolyl copper ring trinuclear scintillator to prepare a scintillating screen material for security detection imaging.

[0055] It should be noted that the scintillating screen material is prepared by the following steps:

[0056] Polymethyl methacrylate (PMMA) and CuCTC are mixed and added to dichloromethane. After stirring at a preset temperature, the mixture is cast onto a silicone mold and air-dried to produce a CuCTC scintillator screen. Specifically, the mass ratio of PMMA to CuCTC is approximately 1:1, and the volume ratio of dichloromethane to PMMA is approximately 5:1. The preset temperature is 35°C, and the stirring time is 5-30 minutes.

[0057] The light yield of the pyrazolyl copper ring trinuclear scintillator described in the present application can reach 70475 photons / MeV, and the photoluminescence quantum yield of the pyrazolyl copper ring trinuclear scintillator can reach 75.62%.

[0058] The preparation process and performance testing of the pyrazolyl copper trinuclear single crystal described in this application will be described in detail below with reference to specific examples:

[0059] Example 1

[0060] Synthesis of CuCTC:

[0061] (Me-Me)Pz-Cu, (Br-Me)Pz-Cu, (Br-Br)Pz-Cu, (Br-Br-Br)Pz-Cu and (I-Me)Pz-Cu use 3,5-dimethyl-1H-pyrazole, 3-bromo-5-methyl-1H-pyrazole, 3,5-dibromo-1H-pyrazole, 3,4,5-tribromo-1H-pyrazole and 3-iodo-5-methyl-1H-pyrazole as ligands, respectively, and can be synthesized according to existing technologies.

[0062] Measurement of X-ray scintillation characteristics:

[0063] Based on the XCOM database provided by the National Institute of Standards and Technology (NIST), the relationship between the total X-ray absorption coefficient and the photon energy was obtained. The attenuation efficiency (AE, %) was further calculated using formula (1):

[0064] (1)AE=(1-e -tρd )×100%

[0065] where ρ (g / cm) is the density of the scintillator and d (cm) is the thickness of the scintillator.

[0066] The X-ray light yield (LY) and detection limit (DL) were measured using a tungsten X-ray tube equipped with a fluorescence spectrometer. LY was determined using a reference method, with commercial LuAg (Ce) crystals used as standard scintillators. To minimize the effect of thickness, all samples were prepared with a thickness of ≥1 mm. Both the samples and the standard scintillator were irradiated using an X-ray tube operating at a voltage of 50 kV and a current of 20 μA. The emitted photons (P measured ) is quantified and normalized to 100% X-ray attenuation (AE) according to formula (2):

[0067]

[0068] where AE(d) is the attenuation coefficient at actual thickness when the photon energy is 8 keV (peak energy of a tungsten tube). The attenuation coefficients for LuAg(Ce), (Me-Me)Pz-Cu, (Br-Me)Pz-Cu, (Br-Br)Pz-Cu, (Br-Br-Br)Pz-Cu, and (I-Me)Pz-Cu are calculated to be 100%, 97.85%, 100%, 100%, 100%, and 100%, respectively.

[0069] The light yield (LY) of the sample can be calculated using formula (3):

[0070]

[0071] The LY of LuAG(Ce) is 25000photons / MeV.

[0072] The detection limit (DL) was analyzed at an X-ray tube voltage of 6-10 kV and a current of 7-15 μA. The emitted photons (P measured ). DL can be calculated using the 3σ / slope method, as shown in formula (4):

[0073]

[0074] Wherein, SD represents the standard deviation of the emission wavelength signal intensity obtained from at least 11 consecutive background noise measurements. Slope refers to the slope of the linear regression curve of the radioluminescence intensity of CuCTC versus X-ray dose rate.

[0075] For X-ray imaging, scintillation screens (6 × 4 cm) were prepared by dissolving 500 mg of polymethyl methacrylate in approximately 10 mL of dichloromethane at 35 °C with stirring. 2After adding 500 mg of (Me-Me)Pz-Cu, the mixture was stirred to form a homogeneous suspension, poured into a silicon mold and air-dried. X-ray imaging was performed using a homemade device equipped with a tungsten filament X-ray tube, an excitation source of 50 kV and 200 μA, and a digital camera was used for photography and video capture. The photo exposure time was 1 second and the video frame rate was 25 frames per second. The spatial resolution of the image was quantified by the modulation transfer function (MTF), which was acquired and analyzed by software containing I max and I min The formula is derived from the three graphs of the values, see equation (5).

[0076]

[0077] Based on the above detection methods, the following conclusions can be drawn:

[0078] Radioluminescence properties:

[0079] With the increase of halogen substitution, the X-ray absorption ability of CuCTC is significantly enhanced ( Figure 9 CuCTC exhibits strong luminescence under X-ray excitation ( Figure 10 This paper evaluates their LY( Figure 10 The b subgraph and Figure 11 ). The results show that (Me-Me)Pz-Cu, (Br-Me)Pz-Cu, (Br-Br)Pz-Cu, (I-Me)Pz-Cu and (Br-Br-Br)Pz-Cu exhibited light yields of approximately 70475photons / MeV, 31257photons / MeV, 23761photons / MeV, 8155photons / MeV and 1635photons / MeV, respectively (Table 1). CuCTCs exhibit excellent photoluminescence properties, and their light yield is significantly better than that of traditional scintillators ( Figure 10 Under continuous X-ray irradiation (total dose of 1.269Gy), CuCTC showed excellent stability ( Figure 10 By adjusting the X-ray dose, their linear luminescence response to X-rays was confirmed ( Figure 10 The e subgraph and Figure 12 , Figure 12The three sub-figures in the middle are (Me-Me)Pz-Cu, (Br-Me)Pz-Cu, and (Br-Br)Pz-Cu from left to right. Based on the slope of the linear regression curve and the standard deviation of the background noise, the detection limits of (Me-Me)Pz-Cu, (Br-Me)Pz-Cu, and (Br-Br)Pz-Cu were calculated to be 0.49 μGy / s, 0.90 μGy / s, and 1.09 μGy / s, respectively. Figure 13 and Table 2, Figure 13 The three sub-images from left to right are (Me-Me)Pz-Cu, (Br-Me)Pz-Cu and (Br-Br)Pz-Cu).

[0080] Table 2:

[0081]

[0082]

[0083] Dynamic X-ray imaging:

[0084] The AIE property of CuCTC makes it suitable for use as a solid-state scintillating screen. In this paper, polymethyl methacrylate (PMMA) was used as the polymer matrix to successfully prepare a 6×4 cm2 CuCTC containing (Me-Me)Pz-Cu (50% by mass) 2 Flashing screen ( Figure 14 ). Under ultraviolet light, the scintillating screen emits bright orange-yellow fluorescence ( Figure 15 Using a self-made X-ray imaging system ( Figure 15 (Figure a in the middle), this application successfully demonstrated that the (Me-Me)Pz-Cu scintillator screen can efficiently and clearly reveal the internal structure of various objects under X-ray irradiation. For example, it effectively visualized a metal thermos inside a shoulder bag, a hidden metal spring inside a pill capsule, and the skeletal structure of a crab, highlighting its potential applications in security inspection and medical imaging ( Figure 15 X-ray images obtained using a line pair resolution standard show that the contrast boundary remains clear when the spatial resolution reaches 14.3 lp / mm ( Figure 15 By drawing the I based on the line pairs in the acquired image max and I min The modulation transfer function (MTF) distribution of the calculated values was determined to have a spatial resolution of 13.4 lp / mm ( Figure 16 ).

[0085] Therefore, in order to verify the dynamic imaging performance of the (Me-Me)Pz-Cu scintillating screen, this application conducted an angiography simulation experiment. The experimental results show that the (Me-Me)Pz-Cu scintillating screen can record real-time video at a fast frame rate of 25 frames per second, clearly capturing the flow of contrast agent ( Figure 15 This performance is attributed to the excellent LY value and relatively short luminescence lifetime of (Me-Me)Pz-Cu, which enables bright and clear imaging even at a short frame interval of 40ms. This rapid scintillation response surpasses conventional angiographic imaging in clinical applications. As a verification of long-term stability, the RL intensity of the (Me-Me)Pz-Cu scintillator screen shows negligible degradation after 200 on-off cycles ( Figure 15 These results highlight CuCTC as a promising indirect scintillator material with excellent light yield, low detection limit and fast scintillation response. In addition, they have a simple synthesis method and extremely low cost. These advantages make CuCTCs a promising alternative to traditional commercial scintillators ( Figure 15 A better alternative to the h subgraph in .

[0086] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. Imaging application of pyrazolyl copper ring trinuclear scintillator, characterized in that: The pyrazolyl copper ring trinuclear scintillator is used for preparing scintillating screen materials for X-ray imaging.

2. The imaging application of the pyrazolyl copper ring trinuclear scintillator according to claim 1, characterized in that: The pyrazolyl copper ring trinuclear scintillator is used to prepare a scintillating screen material for medical imaging.

3. The imaging application of the pyrazolyl copper ring trinuclear scintillator according to claim 2, characterized in that: The pyrazolyl copper ring trinuclear scintillator is used to prepare a scintillating screen material for simulating X-ray dynamic angiography.

4. The imaging application of the pyrazolyl copper ring trinuclear scintillator according to claim 1, characterized in that: The pyrazolyl copper ring trinuclear scintillator is used to prepare a safety detection imaging scintillating screen material.

5. The imaging application of the pyrazolyl copper ring trinuclear scintillator according to any one of claims 1 to 4, characterized in that: The scintillating screen material is prepared by the following steps: Polymethyl methacrylate and CuCTC were mixed and added to dichloromethane. After stirring evenly at a preset temperature, the mixture was cast on a silicone mold and air-dried to obtain a CuCTC scintillator screen.

6. The imaging application of the pyrazolyl copper ring trinuclear scintillator according to claim 5, characterized in that: The mixing mass ratio of the polymethyl methacrylate to the CuCTC is approximately 1:

1.

7. The imaging application of the pyrazolyl copper ring trinuclear scintillator according to claim 5, characterized in that: The mixing volume ratio of the dichloromethane to the polymethyl methacrylate is about 5:

1.

8. The imaging application of the pyrazolyl copper ring trinuclear scintillator according to claim 5, characterized in that: The preset temperature is 35°C, and the stirring time is 5 min-30 min.

9. The imaging application of the pyrazolyl copper ring trinuclear scintillator according to claim 1, characterized in that: The light yield of the pyrazolyl copper ring trinuclear scintillator can reach 70475 photons / MeV.

10. The imaging application of the pyrazolyl copper ring trinuclear scintillator according to claim 1, characterized in that: The photoluminescence quantum yield of the pyrazolyl copper ring trinuclear scintillator can reach 75.62%.

Images