Cuprous iodide complex scintillator and preparation and application thereof

Abstract

The invention discloses a cuprous iodide-based complex scintillator with a thermally activated delayed fluorescence characteristic as well as a preparation method and application of the cuprous iodide-based complex scintillator. The structural general formula of the complex scintillator is shown in the specification, and L represents a P-containing ligand with a conjugated structure. A series of single crystals are grown by adopting a saturated solution volatilization method, the cost is low, the preparation condition is simple and mild, the environment is friendly, and the obtained cuprous iodide complex scintillator has good scintillation performance and good stability in the single crystal state and the glass state, has an excellent response effect under the X-ray excitation condition, and can be used for preparing the X-ray scintillator. The flexible film prepared by doping and the glassy film prepared by melting and quenching can realize high-resolution dynamic X-ray imaging.

Description

Technical Field

[0001] The present invention belongs to the field of material technology, and in particular relates to a cuprous iodide complex scintillator with thermally activated delayed fluorescence characteristics, and the preparation and application thereof. Background Art

[0002] As the demand for scintillator technology continues to increase in medical imaging, industrial flaw detection, aerospace, and security, achieving high-precision and high-resolution imaging at low doses has become a core goal. X-ray scintillators, as the core material for converting high-energy X-rays into low-energy ultraviolet or visible light, play a key role in this process. However, existing commercial scintillator materials are mostly inorganic single crystals, which have problems such as high cost, difficult processing, and harsh growth temperatures. In contrast, cuprous iodide hybrid scintillators have attracted much attention due to their advantages such as low cost, easy preparation, flexible compatibility, and luminescence stability. Their unique photophysical and chemical properties, combined with the controllable organic ligand structure, provide rich possibilities for in-depth optimization of the luminescence performance of commercial scintillators.

[0003] When X-ray scintillator materials are acted upon by radiation, excitons transition from the ground state to a high-energy excited state and induce radiative transitions, thereby achieving X-ray excitation luminescence. In order to optimize the luminescence effect, it is necessary to improve the material's ability to absorb X-rays and the efficiency of exciton utilization. Compared with traditional fluorescent materials, thermally activated delayed fluorescence (TADF) materials convert triplet excitons into singlet excitons and produce delayed fluorescence through the reverse intersystem crossing process, thereby enhancing the material's luminescence performance. With its theoretical 100% high exciton utilization rate, adjustable luminescence color, and excellent spectral purity, it has shown unique application potential in the field of X-ray scintillators. Cu (I) has d 10 The center of the electronic configuration can combine with halogens and organic ligands to form cuprous iodide complex materials with excellent luminescence properties. Ligands composed of different elements provide rich structural diversity, offering unlimited possibilities for exploring cuprous iodide complex scintillator materials with better performance.

[0004] From polymer doping, single crystal processing to particle deposition technology, the preparation process of scintillating films is gradually developing towards high density, low scattering and flexibility. Despite the continuous optimization of the preparation process and imaging performance, powder-based scintillating films still face many challenges in practical applications. Glassy materials have become a candidate system that has attracted much attention in recent years because they can be prepared through a simple melting-quenching process and have outstanding advantages such as high optical transmittance, uniform composition, and easy large-area molding. Their high transmittance effectively alleviates the light scattering problem that is common in powder systems, and the mild processing conditions facilitate the controllability of shape and size. Therefore, combining the high transmittance imaging properties of glassy materials with the excellent radioluminescence properties of TADF-type transition metal complexes, exploring high spatial resolution imaging strategies under low-dose conditions has become a new idea and source of scientific and technological innovation. Summary of the Invention

[0005] By regulating the ligand substituents, the present invention obtains a series of novel Cu(I)-based phosphorus complex TADF molecules, which not only exhibit excellent X-ray excitation luminescence properties, but also can achieve high spatial resolution X-ray imaging at low doses through flexible films made by doping or glassy films prepared by melt quenching. At the same time, the preparation method is simple and cost-effective.

[0006] To achieve the above object, the present invention adopts the following technical solutions: One of the purposes of the present invention is to protect a type of cuprous iodide complex scintillator having thermally activated delayed fluorescence properties, the general structural formula of which is: , In the formula, L represents a P-containing ligand with a conjugated structure, wherein L1 and L2 are independently selected from a first ligand containing a coordinating atom such as phosphine or nitrogen, which can be a bidentate ligand or the same or different monocoordinate ligands. The first ligand can achieve regulation of the melting point and luminescence behavior by providing steric hindrance. L3 and L3' are selected from the same second ligand, which can specifically be two ligands or the same ligand.

[0007] Further, the first ligand is selected from triphenylphosphine, tricyclohexylphosphine, diphenyl p-phenylphenylphosphine, 4-(diphenylphosphino)aniline, 2-(diphenylphosphino)aniline, 4-(diphenylphosphino)methyl benzoate, 2-(diphenylphosphino)-methyl benzoate, tri(2-fluorophenyl)phosphine, tri(3-fluorophenyl)phosphine, tri(4-fluorophenyl)phosphine, tri(4-trifluoromethylphenyl)phosphine, tri[3,5-bis(trifluoromethyl)phenyl]phosphine, tri(pentafluorophenyl)phosphine, tris(3,5-bis(trifluoromethyl)phenyl)phosphine, tris ... tri(4-hydroxyphenyl)phosphine, tri(o-methoxyphenyl)phosphine, tri(3,5-xylyl)phosphine, 4-(dimethylamino)triphenylphosphine, tri(4-tert-butylphenyl)phosphine.

[0008] Further, the second ligand is selected from diphenyl-2-pyridylphosphine, 2,2'-(phenylphosphine diyl)dipyridine, tri(2-pyridyl)phosphine, tri(4-pyridyl)phosphine, 2-(diphenylphosphine)-6-methylpyridine, 2-[2-(diphenylphosphino)ethyl]pyridine, 2-[bis(diphenylphosphino)methyl]pyridine, 2,6-bis(diphenylphosphino)pyridine, 2-[(diphenylphosphino)methyl]pyrrolidine; preferably diphenyl-2-pyridylphosphine.

[0009] Preferably, the chemical structural formula of the cuprous iodide complex scintillator is: , In the formula, S is the abbreviation of the substituent, which can be replaced by H, F, Me, OMe, Br, OH, or any combination of two. Specifically, the chemical structure of the cuprous iodide complex scintillator formed by it is as follows: .

[0010] The second object of the present invention is to protect the preparation method of the cuprous iodide complex scintillator, which comprises the following steps: 1) CuI, the first ligand, and the second ligand were reacted in dichloromethane at room temperature for 2 hours and then filtered to obtain a precursor solution; 2) Rotary evaporation of the saturated precursor solution obtained in step 1) to obtain powder, and then adding a solvent to dissolve and then cultivating and crystallizing. The obtained crystal is the cuprous iodide complex scintillator.

[0011] Furthermore, the molar ratio of CuI, the first ligand and the second ligand used in step 1) is 2:2:1.

[0012] Furthermore, the solvent in step 2) includes at least one of dichloromethane, N,N-dimethylacetamide, dimethyl sulfoxide, acetonitrile, and toluene.

[0013] Furthermore, in step 2), the cultured crystals are placed at room temperature for 5-7 days to allow the solvent to evaporate.

[0014] The third purpose of the present invention is to protect the application of the cuprous iodide complex scintillator.

[0015] The cuprous iodide complex scintillator can be made into X-ray scintillator materials such as X-ray glass scintillating films, and applied to X-ray imaging fields such as medical imaging, industrial flaw detection, underwater nondestructive testing, and living organism monitoring.

[0016] Compared with the prior art, the present invention has the following advantages: (1) The CuI used in the present invention is inexpensive, non-toxic, and abundant in Earth's reserves, significantly reducing production costs. The one-pot process is relatively simple to operate and does not involve highly toxic or polluting organic reagents. Furthermore, the entire preparation process is mild and has a high yield, thus resolving to some extent the problem that the preparation of current X-ray scintillator materials is relatively complicated and expensive.

[0017] (2) The Cu2I2Dppy(S-PPh3)2 prepared by the present invention has good scintillation performance, among which the CuH with the best crystalline performance has a light yield of up to 117,600 photons MeV -1 , with a detection limit as low as 47.3 nGy s-1 , which is about 1 / 116 of the conventional medical dose. The series of complexes still maintain the TADF emission characteristics after the glass transition, and the light yield is 50,000 photons MeV -1 At 278 μGy s -1 After 1800 seconds of continuous irradiation at the dose, the RL strength of the glassy material still maintained more than 95% of the initial value, and the dynamic disordered network formed by the resulting melt-quenching had strong tolerance to radiation damage.

[0018] (3) The cuprous iodide complex scintillator of the present invention can realize high-resolution X-ray imaging. The obtained Cu2I2Dppy(S-PPh3)2 series materials are dissolved in DMF and then doped into PMMA. A flexible film with good luminescence effect can be obtained by simple scraping. By regulating the molecular structure of the second ligand, the melting point of CuOMe can be reduced to 190°C, and the controllable preparation of large-area glass films can be achieved. Due to its good response to X-rays, the prepared glass film has a high luminescence effect at 0.1 μGy s -1 Under low-dose conditions, 28.3 lp mm -1 High spatial resolution imaging performance with MTF=0.2. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The crystal structures of the cuprous iodide complex scintillators CuH, CuF, CuMe, and CuOMe prepared in Example 1 are shown.

[0020] Figure 2 The differential scanning gravimetric (DSC) curves of the cuprous iodide complex scintillators CuH, CuF, CuMe, and CuOMe prepared in Example 1 are shown in FIG. 1a , and FIG. 1b , respectively, of the first heating step (a) and the second heating step (b).

[0021] Figure 3 X-ray excited luminescence spectra and corresponding maximum RL intensities (a), X-ray energy-dependent absorption spectra (b), X-ray attenuation efficiency as a function of material thickness (c), relative steady-state X-ray light yield with reference to CsI:Tl (d), and relative steady-state X-ray light yield with reference to BGO (e) of the cuprous iodide complex scintillators CuH, CuF, CuMe, and CuOMe prepared in Example 1.

[0022] Figure 4 The RL intensity of the prepared cuprous iodide complex scintillators CuH, CuF, CuMe, and CuOMe in the crystalline and glassy states is related to the dose rate (4.58 to 278 μGy s -1 )relation.

[0023] Figure 5The prepared cuprous iodide complex scintillators CuH, CuF, CuMe, and CuOMe have a high ion density at 278 μGy s in the glassy state. -1 Stability cycle diagram of continuous irradiation for 1800 seconds at the same dose.

[0024] Figure 6 MTF curve (a) and imaging under X-ray irradiation (b) of the glassy film prepared using cuprous iodide complex scintillator CuOMe. DETAILED DESCRIPTION

[0025] A type of cuprous iodide complex scintillator with thermally activated delayed fluorescence properties has the general structural formula: , In the formula, L represents a P-containing ligand with a conjugated structure, wherein L1 and L2 are independently selected from a first ligand containing a coordinating atom such as phosphine or nitrogen, which can be selected from triphenylphosphine, tricyclohexylphosphine, diphenyl-p-phenylphenylphosphine, 4-(diphenylphosphino)aniline, 2-(diphenylphosphino)aniline, 4-(diphenylphosphino)benzoic acid methyl ester, 2-(diphenylphosphino)-benzoic acid methyl ester, tri(2-fluorophenyl)phosphine, tri(3-fluorophenyl)phosphine, tri(4-fluorophenyl)phosphine, tri(4-trifluoromethylphenyl)phosphine, tri[3,5-bis(trifluoromethyl)phenyl]phosphine, tri(pentafluorophenyl)phosphine, decafluorotriphenylphosphine, tri(3-chlorophenyl)phosphine, tri(4-chlorophenyl)phosphine, chlorobis(4-chlorophenyl)phosphine, tri(4-bromophenyl)phosphine, tri(p- L3 and L3' are selected from the same second ligand, which can be selected from diphenyl-2-pyridylphosphine, 2,2'-(phenylphosphinediyl)dipyridine, tri(2-pyridyl)phosphine, tri(4-pyridyl)phosphine, 2-[2-(diphenylphosphino)ethyl]pyridine, 2-[bis(diphenylphosphino)methyl]pyridine, 2,6-bis(diphenylphosphino)pyridine, and 2-[(diphenylphosphino)methyl]pyrrolidine.

[0026] The preparation method of the cuprous iodide complex scintillator comprises the following steps: 1) CuI, the first ligand, and the second ligand were reacted in a molar ratio of 2:2:1 in dichloromethane at room temperature for 2 hours, and then filtered to obtain a precursor solution; 2) Rotary evaporation of the saturated precursor solution obtained in step 1) to obtain a powder, which is then dissolved in a solvent and allowed to stand at room temperature for 5-7 days until the solvent evaporates and crystallizes. The resulting crystals are the cuprous iodide complex scintillator.

[0027] Wherein, the solvent in step 2) comprises at least one of dichloromethane, N,N-dimethylacetamide, dimethyl sulfoxide, acetonitrile and toluene.

[0028] The technical solutions of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely exemplary illustrations and explanations of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included within the scope of protection intended by the present invention.

[0029] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.

[0030] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0031] The present invention can employ conventional techniques of organic chemistry within the skill of the art. In the following examples, efforts have been made to ensure the accuracy of the numbers used (including amounts, temperatures, reaction times, etc.), but some experimental errors and deviations should be taken into account. The temperatures used in the following examples (in degrees Celsius) are expressed in °C, and pressures are at or near atmospheric pressure. All solvents were purchased as HPLC grade, and all reactions were conducted under an inert atmosphere of nitrogen. Unless otherwise noted, all reagents were obtained commercially.

[0032] Example 1 Synthesis of Cu2I2Dppy(S-PPh3)2

[0033] CuI (1 mmol), diphenyl-2-pyridylphosphine (dppy) (0.5 mmol) and the first ligand triphenylphosphine (PPh3), tri(4-fluorophenyl)phosphine (F-PPh3), tri(p-tolyl)phosphine (Me-PPh3), tri(4-methoxyphenyl)phosphine (OMe-PPh3), tri(4-bromophenyl)phosphine (Br-PPh3) or tri(4-hydroxyphenyl)phosphine (OH-PPh3) (1 mmol), or tri(4-methoxyphenyl)phosphine (OMe-PPh3) (0.5 mmol) and tri(4-bromophenyl)phosphine (Br-PPh3) (0.5 mmol), tri(4-hydroxyphenyl)phosphine (OH-PPh3) and tri(4-bromophenyl)phosphine (Br-PPh3) (0.5 mmol) were added to dichloromethane (30 mL) and reacted at room temperature for 2 hours. A light yellow clear precursor solution was obtained by filtration. The solvent was removed by rotary evaporation and acetonitrile (40 mL), placed in the dark at room temperature, and evaporated naturally for one week to obtain the corresponding crystals, which were marked as CuH, CuF, CuMe, and CuOMe, respectively.

[0034] The corresponding crystals can be obtained by replacing the second ligand with tri(4-methoxyphenyl)phosphine (OMe-PPh3) (0.5 mmol) and tri(4-bromophenyl)phosphine (Br-PPh3) (0.5 mmol), or tri(4-hydroxyphenyl)phosphine (OH-PPh3) and tri(4-bromophenyl)phosphine (Br-PPh3) (0.5 mmol).

[0035] Example 2 Glassy film formation 500 mg of the high-purity crystal obtained in Example 1 was weighed and placed on a heating table covered with tin foil. The powder was heated to 190°C to completely melt the powder. A capillary was used to adjust the glassy shape and eliminate bubbles. The material and tin foil were then rapidly cooled to obtain a large-area glassy scintillating film that can be used for imaging.

[0036] Example 3 Flexible Filtration Membrane Formation After removing the solvent from the 0.5 mmol clarified precursor solution obtained in Example 1 via a rotary evaporator, 30 mL of acetonitrile was added. Ultrasonication was then used to evenly distribute the generated microcrystals in the solvent. The solution was allowed to stand at room temperature for 1 hour. The supernatant was then aspirated and filtered through a lipophilic PET core-track-etched microporous filter membrane. The micron-sized scintillating crystal particles were uniformly deposited on the filter membrane, forming a particle-deposited scintillating film approximately 30 μm thick. The particle-deposited scintillating film and filter membrane were then dried in a vacuum oven at 45°C for 5 hours to remove all solvent molecules, yielding a concentrated micron-sized flexible scintillating film.

[0037] Example 4 Flexible Doping Film Formation The microcrystalline powder obtained in Example 3 was dried in an oven and then transferred to a ball mill for ball milling to obtain a finer powder. A few drops of DMF solution were then added to dissolve it, and then the powder was added to the PVP polymer matrix. After heating on a hot plate at 50°C, stirring and mixing evenly, the powder was spread into a polytetrafluoroethylene mold. After drying, the powder was taken out and peeled off to obtain a large-area flexible film.

[0038] Example 5 Experimental Analysis The photoluminescence spectra of the six crystals were measured at room temperature using an FLS980 fluorescence spectrometer. The corresponding RL spectra were measured using an X-ray tube (Mini-X2, Amptek, USA).

[0039] The stability cycle diagram obtained under X-ray dose irradiation for 1 hour was measured by an FLS980 fluorescence spectrometer equipped with an X-ray tube (Mini-X2, Amptek, USA).

[0040] The X-ray imaging diagram is obtained by connecting an inverted fluorescence microscope to a portable X-ray tube, with a line pair card as the imaging object.

[0041] Figure 2 The differential scanning gravimetric (DSC) curves of the cuprous iodide complex scintillators CuH, CuF, CuMe, and CuOMe prepared in Example 1 are shown in the following table: Figure 2 During the first heating process, the differential scanning calorimetry (DSC) curves of CuH, CuF, CuMe, and CuOMe exhibit melting peaks at 221, 244, 212, and 190°C, corresponding to their respective melting temperatures (Tm). During the second heating process, glass transition peaks for CuH, CuF, CuMe, and CuOMe appear at 129, 116, 112, and 100°C, corresponding to their respective glass transition temperatures (Tg). The Tg / Tm values ​​are all greater than 0.78, exceeding the critical threshold for stable glass formation (Tg / T = 2 / 3), indicating that each material possesses excellent glass-forming ability. Furthermore, it is shown that the glass transition temperature of each material can be successfully lowered from 129°C (CuF) to 100°C (CuOMe) by regulating the para-substituent on the phenyl ring of triphenylphosphine, demonstrating that the introduction of substituents can influence the glass transition temperature of a material.

[0042] Figure 3 The X-ray excitation spectra and corresponding maximum RL intensity (a), X-ray energy-dependent absorption spectra (b), X-ray attenuation efficiency as a function of material thickness (c), and light yields using CsI:Tl (d) and BGO (e) as standard references for the prepared cuprous iodide complex scintillators CuH, CuF, CuMe, and CuOMe. Figure 3 It can be seen that at 278 μGy s -1 All materials showed excellent X-ray response under the dose, among which the radiation luminescence intensity of CuH reached 37.06×10 4 au, significantly better than the commercial inorganic scintillator BGO (4.31×10 4 au) and CsI:Tl (25.20×10 4 au), which are 8.6 times and 1.47 times of the two respectively. The quantum yield of glassy materials is stable at about 3 times that of BGO, showing the unique advantages of amorphous systems in low-dose imaging (a). At the same time, compared with BGO and CsI:Tl (d, e), CuH shows a high quantum yield of up to 108,602 photons MeV -1 and 117,600 photons MeV -1 In the glassy state, the light yields of each material are as high as 49345 (CuH-G) ~ 53957 (CuMe-G) photons MeV -1(BGO comparison), 45565 (CuH-G) ~ 49823 (CuMe-G) photons MeV -1 (CsI:Tl comparison). The results show that the material still maintains the TADF emission characteristics after the glass transition, and the light yield is 50,000 photons MeV -1 It has good radioluminescence properties.

[0043] Figure 4 The RL intensity of the prepared cuprous iodide complex scintillators CuH, CuF, CuMe, and CuOMe in the crystalline and glassy states is related to the dose rate (4.58 to 278 μGy s -1 ) relationship. Figure 4 The detection limit values ​​of a series of cuprous iodide complex scintillators were obtained through calculation and analysis. Among them, the detection limit of CuH with the best performance was as low as 47.3 nGy s. -1 , which is 1 / 116 of the minimum dose for medical diagnosis.

[0044] Figure 5 The prepared cuprous iodide complex scintillators CuH, CuF, CuMe, and CuOMe have a high ion density at 278 μGy s in the glassy state. -1 Stability cycle diagram of continuous irradiation for 1800 seconds at the same dose. Figure 5 It shows that the series of cuprous scintillators have good stability in the glassy state, and their RL intensity remains above 95% of the initial value.

[0045] Figure 6 The MTF curve (a) and the image (b) of the glassy film prepared using the cuprous iodide complex scintillator CuOMe under X-ray irradiation were shown. The spatial resolution of the CuOMe-G film was evaluated by the standard line pair card test, and the spatial resolution of the image was quantified using MTF. The results showed that the spatial resolution of the CuOMe-G film was 14.3-20.0 lp mm -1 Within the spatial frequency range, the MTF value is stable at 0.82 (14.3lp mm -1 )、0.67(16.6 lp mm -1 )、0.35(20.0 lp mm -1 ), indicating that its resolution exceeds the limit of conventional line pair cards (a). To further quantify the limit performance, the tungsten sheet bevel edge method was used to test the 0.1 mGy s -1 At ultra-low dose, the material can achieve 28.3 lp mm -1 High spatial resolution with MTF = 0.2. In actual imaging tests, the film can clearly resolve the internal structure of a PCB circuit board and the skeletal structure of a small fish (b), demonstrating its excellent imaging capabilities.

[0046] The present invention is illustrated by the above-described embodiments. However, those skilled in the art will appreciate that the following embodiments are not intended to limit the scope of the present invention. Those skilled in the art will recognize that, based on the teachings herein, numerous modifications and substitutions may be made without departing from the scope of the present invention as defined in the appended claims. Any improvements and variations based on the present invention are considered within the scope of the present invention.

Claims

1. A cuprous iodide complex scintillator with thermally activated delayed fluorescence properties, characterized in that: Its general structural formula is: ， In the formula, L represents a P-containing ligand with a conjugated structure, wherein L1 and L2 are independently selected from a first ligand, and L3 and L3' are selected from the same second ligand.

2. The cuprous iodide complex scintillator according to claim 1, characterized in that: The first ligand is selected from triphenylphosphine, tricyclohexylphosphine, diphenyl-p-phenylenediamine, 4-(diphenylphosphino)aniline, 2-(diphenylphosphino)aniline, 4-(diphenylphosphino)benzoic acid methyl ester, 2-(diphenylphosphino)-benzoic acid methyl ester, tri(2-fluorophenyl)phosphine, tri(3-fluorophenyl)phosphine, tri(4-fluorophenyl)phosphine, tri(4-trifluoromethylphenyl)phosphine, tri[3,5-bis(trifluoromethyl)phenyl]phosphine, tri(pentafluorophenyl)phosphine )phosphine, decafluorotriphenylphosphine, tri(3-chlorophenyl)phosphine, tri(4-chlorophenyl)phosphine, chlorobis(4-chlorophenyl)phosphine, tri(4-bromophenyl)phosphine, tri(p-tolyl)phosphine, tri(o-methylphenyl)phosphine, tri-mesitylphosphine, tri(4-methoxyphenyl)phosphine, tri(4-hydroxyphenyl)phosphine, tri(o-methoxyphenyl)phosphine, tri(3,5-xylyl)phosphine, 4-(dimethylamino)triphenylphosphine, tri(4-tert-butylphenyl)phosphine.

3. The cuprous iodide complex scintillator according to claim 1, characterized in that: The second ligand is selected from diphenyl-2-pyridylphosphine, 2,2'-(phenylphosphinodiyl)dipyridine, tri(2-pyridyl)phosphine, tri(4-pyridyl)phosphine, 2-(diphenylphosphino)-6-methylpyridine, 2-[2-(diphenylphosphino)ethyl]pyridine, 2-[bis(diphenylphosphino)methyl]pyridine, 2,6-bis(diphenylphosphino)pyridine, and 2-[(diphenylphosphino)methyl]pyrrolidine.

4. A method for preparing a cuprous iodide complex scintillator according to claim 1, characterized in that: The following steps are involved: 1) CuI, the first ligand, and the second ligand were reacted in dichloromethane at room temperature for 2 hours and then filtered to obtain a precursor solution; 2) Rotary evaporation of the saturated precursor solution obtained in step 1) to obtain powder, and then adding a solvent to dissolve and then cultivating and crystallizing. The obtained crystal is the cuprous iodide complex scintillator.

5. The method for preparing a cuprous iodide complex scintillator according to claim 4, wherein: The molar ratio of CuI, the first ligand and the second ligand used in step 1) is 2:2:

1.

6. The method for preparing a cuprous iodide complex scintillator according to claim 4, wherein: Step 2) The solvent comprises at least one of dichloromethane, N,N-dimethylacetamide, dimethyl sulfoxide, acetonitrile, and toluene.

7. The method for preparing a cuprous iodide complex scintillator according to claim 4, wherein: Step 2) The cultured crystals are placed at room temperature for 5-7 days to allow the solvent to evaporate.

8. Use of the cuprous iodide complex scintillator according to claim 1 in preparing an X-ray scintillator material.

9. Use of the cuprous iodide complex scintillator according to claim 1 in the field of X-ray imaging.

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