Copper-based organic-inorganic hybrid crystal and preparation method thereof

Abstract

The invention discloses a copper-based organic-inorganic hybrid crystal and a preparation method thereof. The chemical formula of the copper-based organic-inorganic hybrid crystal is (C18H15OP) 6Cu5Br7. 2 (H3O). The crystal combines designability of an organic ligand and stability of an inorganic metal center, shows excellent photoelectric properties, and is suitable for the fields of luminescent materials, photoelectric detectors, X-ray scintillators and the like. According to the preparation method, an evaporative crystallization method is adopted, raw materials such as (C6H5) 3PBr2 and CuBr are dissolved in absolute ethyl alcohol, hydrobromic acid and hypophosphorous acid, the mixture is placed in a three-necked flask for a heating reaction, and after the reaction is finished, centrifugal separation, washing and drying are performed to obtain a target crystal. The method is mild in condition, simple and convenient to operate and suitable for large-scale production. The obtained crystal shows an efficient luminescence property under ultraviolet excitation, an emission peak is located in a visible light region, and the crystal has high photoluminescence quantum efficiency and good thermal stability and chemical stability, and is especially suitable for LED illumination and night vision equipment. The invention provides a new thought and method for developing a novel high-performance luminescent material.

Description

Technical Field

[0001] The present invention relates to the field of organic-inorganic hybrid materials, and more specifically to a copper-based organic-inorganic hybrid crystal and its preparation method. The crystal has excellent optical properties and stability and can be widely used in optoelectronic materials, light-emitting diodes (LEDs), X-ray imaging, and other fields. Background Art

[0002] Organic-inorganic hybrid materials have attracted widespread attention due to their unique optoelectronic properties and structural diversity. Combining the designability of organic molecules with the stability of inorganic materials, these materials exhibit excellent optical and electrical properties and are widely used in light-emitting diodes (LEDs), photodetectors, X-ray scintillators, and other fields. Copper-based organic-inorganic hybrid materials, in particular, are considered a promising new material due to their low cost, high stability, and excellent optoelectronic properties (Adv. Optical Mater., 2024, 2401648; J. Am. Chem. Soc., 2024, 146, 7373-7385).

[0003] However, most of the current research on copper-based hybrid materials focuses on two-dimensional or three-dimensional structures, and there is relatively little research on copper-based hybrid materials with zero-dimensional (0D) or low-dimensional structures. In addition, existing copper-based hybrid materials still have deficiencies in luminous efficiency, stability and processability, which limits their application in actual optoelectronic devices. For example, traditional copper-based hybrid materials are prone to decomposition in a humid environment, resulting in performance degradation (Laser Photonics Rev. 2024, 2400244. Angew. Chem. Int. Ed. 2024, 63, e202402634.). Therefore, the development of new copper-based organic-inorganic hybrid materials with higher stability and luminous efficiency is of great significance for meeting the needs of practical applications.

[0004] The present invention aims to overcome the limitations of existing materials by designing and synthesizing a new type of copper-based organic-inorganic hybrid crystal, and provide a material with excellent photoelectric properties and high stability to meet the needs of fields such as luminescent materials, photodetectors and X-ray scintillators. Summary of the Invention

[0005] This invention aims to provide a copper-based organic-inorganic hybrid crystal and its preparation method, addressing the existing issues of complex processes, high costs, low luminescence efficiency, and poor stability. By introducing specific organic ligands and inorganic metal centers, the copper-based organic-inorganic hybrid crystal exhibits excellent optical properties and stability, making it suitable for applications in optoelectronic materials, X-ray imaging, and night vision equipment.

[0006] The chemical formula of the copper-based organic-inorganic hybrid crystal of the present invention is (C 18 H 15 (C6H5)3PBr2 (C6H5)6Cu5Br7·2(H3O). This crystal is prepared by the self-assembly reaction of an organophosphine ligand (C6H5)3PBr2 and the copper salt CuBr in a solvent. It exhibits strong luminescence and excellent thermal stability. Compared to existing technologies, the crystal of this invention emits bright orange light under ultraviolet light excitation and maintains good performance in humid environments.

[0007] The preparation method of the present invention comprises the following steps:

[0008] Preparation of raw materials: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and copper salt CuBr and mix them according to the stoichiometric ratio.

[0009] Solution preparation: Dissolve the above raw materials in an appropriate amount of organic solvent and stir evenly to form a uniform solution.

[0010] Reaction process: Place the mixed solution at 100-140°C and stir for reaction for 2 hours.

[0011] Crystal precipitation: After the reaction is completed, the solution is allowed to stand at 20-30°C and the crystals are slowly precipitated by solvent evaporation.

[0012] Post-treatment: the precipitated crystals were filtered, washed three times with ethanol, and then dried at 60-70°C for 5-8 hours to obtain the final product.

[0013] The copper-based organic-inorganic hybrid crystals of the present invention have the following advantages:

[0014] High luminous efficiency: It can emit bright visible light under ultraviolet light excitation, suitable for LED lighting and night vision equipment.

[0015] Good stability: It can maintain good performance in humid environments and is suitable for X-ray imaging.

[0016] The preparation process is simple: it adopts a solvent volatilization method with mild conditions and is suitable for large-scale production.

[0017] The preparation method of the present invention can efficiently synthesize copper-based organic-inorganic hybrid crystals with excellent performance, providing new ideas and methods for the development of new high-performance optoelectronic materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 XRD pattern and single crystal fitting diagram of the crystal prepared in Example 1 of the present invention.

[0019] Figure 2The excitation spectrum (monitoring wavelength is 639 nm) and emission spectrum (excitation wavelength is 375 nm) of the orange light glass prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the embodiments and drawings. However, the scope of protection claimed by the present invention is not limited to the scope shown in the embodiments.

[0021] Example 1: Accurately weigh the organophosphine ligand (C6H5)3PBr2 and the copper salt CuBr and mix them evenly according to the stoichiometric ratio. The mixed raw materials are dissolved in anhydrous ethanol, hydrobromic acid, and hypophosphorous acid in a three-necked flask and stirred until a transparent solution is formed. The solution is then stirred and reacted at 125°C for 2 hours. After the reaction is complete, the solution is allowed to stand and crystals are slowly precipitated by evaporative crystallization. Once the crystals have completely precipitated, they are filtered, washed thoroughly three times with deionized water, and finally dried at 60°C for 5 hours to obtain the final product.

[0022] The XRD powder diffractometer (Bruker D8 Advance) was used for detection. Figure 1 As shown in Figure 2, the XRD results of the transparent crystal of the product are consistent with the high-energy ray single crystal fitting diagram. The luminescence performance of the product was tested using a fluorescence spectrometer (HORIBA Jobin Yvon Inc. Fluoromax-4). Figure 2 As shown, the excitation spectrum of the product of this embodiment has a strong broadband absorption peak in the long-wave region of 200-500nm, which can effectively absorb the light emitted by the purple LED. Figure 2 The XRD and fluorescence spectra of the products in the following examples of the present invention are similar to those in this example and are not described in detail.

[0023] Example 2: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 100°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 5 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0024] Example 3: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 110°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 5 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0025] Example 4: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 130°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 5 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0026] Example 5: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 140°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 5 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0027] Example 6: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 125°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 6 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0028] Example 7: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 125°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 7 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0029] Example 8: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 125°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 8 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0030] Example 9: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 125°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 70°C for 5 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0031] Example 10: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 100°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 70°C for 5 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0032] Example 11: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 110°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 70°C for 5 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0033] Example 12: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 120°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 70°C for 5 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0034] Example 13: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 130°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 70°C for 5 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0035] Example 14: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 140°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 70°C for 5 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0036] Example 15: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 100°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 6 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0037] Example 16: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 100°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 7 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0038] Example 17: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 100°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 8 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0039] Example 18: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 110°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 6 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0040] Example 19: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 110°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 7 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0041] Example 20: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 110°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 8 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0042] Example 21: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 120°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 6 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0043] Example 22: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 120°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 7 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0044] Example 23: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 120°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 8 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0045] Example 24: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 130°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 6 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

[0046] Example 25: Accurately weigh the organic phosphine ligand (C6H5)3PBr2 and the copper salt CuBr, and mix them evenly according to the stoichiometric ratio. Dissolve the mixed raw materials in anhydrous ethanol, hydrobromic acid and hypophosphorous acid, place them in a three-necked flask and stir until a transparent solution is formed. Subsequently, the solution is stirred and reacted at 130°C for 2 hours. After the reaction is completed, the solution is allowed to stand and the crystals are slowly precipitated by evaporation crystallization. After the crystals are completely precipitated, they are filtered out, carefully washed three times with deionized water, and finally dried at 60°C for 7 hours to obtain the final product. The XRD pattern and fluorescence spectrum of the product in this embodiment are basically similar to those in Example 1.

Claims

1. A copper-based organic-inorganic hybrid crystal, characterized in that: Its chemical formula is (C 18 H 15 OP)6Cu5Br7·2(H3O).

2. The copper-based organic-inorganic hybrid crystal according to claim 1, characterized in that The crystal exhibits strong luminescence characteristics under ultraviolet light irradiation, and the luminescence wavelength range is 500-900nm.

3. The copper-based organic-inorganic hybrid crystal according to claim 1, characterized in that The crystal has excellent thermal stability and chemical stability and is suitable for the fields of optoelectronic materials and X-ray imaging.

4. A method for preparing the copper-based organic-inorganic hybrid crystal according to claim 1, characterized in that: The following steps are involved: a) mixing an organic phosphine ligand (C6H5)3PBr2 and a copper salt CuBr in a stoichiometric ratio and dissolving the mixture in an organic solvent; b) stirring the reaction in a heating mantle to form a clear solution; c) allowing the reaction solution to stand and cool, and obtaining crystals by cooling crystallization; d) filtering, washing and drying the crystals to obtain a copper-based organic-inorganic hybrid crystal.

5. The preparation method according to claim 4, characterized in that The solvent is anhydrous ethanol, hydrobromic acid and hypophosphorous acid.

6. The preparation method according to claim 4, characterized in that The molar ratio of the organic phosphine ligand (C6H5)3PBr2 to the copper salt CuBr is 6:

5. The preparation method according to claim 4, characterized in that The reaction solution is heated for 2-4 hours at a temperature of 100-140°C. The preparation method according to claim 4, characterized in that The reaction solution is allowed to stand for 2-7 days at a temperature of 20-30°C. The preparation method according to claim 4, characterized in that The drying temperature of the crystals is 50-80° C., and the drying time is 2-4 hours.

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