Bisphosphine donor-acceptor luminescent material, metal halide single crystal material, preparation method and application thereof

Abstract

The present invention discloses a bisphosphine donor-acceptor luminescent material, a metal halide single crystal material, and a preparation method and application thereof, belonging to the technical field of luminescent materials. The preparation method of the bisphosphine donor-acceptor luminescent material comprises the following steps: in the presence of a solvent, reacting 1,2-bis(diphenylphosphino)benzene and a halogenated compound to obtain the bisphosphine donor-acceptor luminescent material. The present invention uses 1,2-bis(diphenylphosphino)benzene as a substrate and carries out a one-step reaction with the halogenated compound. The final product obtained is a bisphosphine donor-acceptor luminescent material in which trivalent phosphine and pentavalent phosphonium coexist. The synthesized bisphosphine donor-acceptor luminescent material uses trivalent phosphine as an electron donor and pentavalent phosphonium salt as an electron acceptor, and simultaneously realizes phosphorus as an electron donor and acceptor in the same molecule. The synthesized molecule has bright visible light emission under ultraviolet light excitation, and the luminescence mechanism is attributed to thermally activated delayed fluorescence.

Description

Technical Field

[0001] The present invention relates to the technical field of luminescent materials, and in particular to a diphosphine donor-acceptor luminescent material, a metal halide single crystal material, and a preparation method and application thereof. Background Art

[0002] Luminescent materials, especially organic small molecule luminescent materials, play a vital role in solid-state lighting, light-emitting diodes, optical thermometry, anti-counterfeiting, and scintillators. Therefore, the development of new organic molecules is essential. Among them, thermally activated delayed fluorescence (TADF) molecules have important applications in organic electroluminescent devices due to their high exciton utilization rate. The energy level difference between the singlet and triplet states of TADF molecules is relatively small. The triplet excitons, which account for 75%, can overcome the energy barrier between the triplet and singlet states, reach the singlet state through antisystem crossing, and then radiate to produce fluorescence.

[0003] To ensure high luminescence efficiency, the energy difference between the singlet and triplet states of a material must be as small as possible. Quantum chemical calculations show that to achieve a small energy difference between the singlet and triplet states, a common strategy is to design the host-guest structure within the molecule so that the HOMO and LUMO orbitals are localized on the molecule's donor and acceptor, respectively. Therefore, the choice of donor and acceptor is particularly important. Donors are usually electron-rich groups, with common electron acceptors being carbazole derivatives and amines, while acceptors are electron-deficient groups such as phosphine oxide, triazine, and cyano derivatives.

[0004] The synthesis of some currently reported host-guest organic molecules is complex, often requiring multiple steps, resulting in low yields and high costs. Furthermore, they often require expensive precious metal catalysts, hindering their large-scale commercial application. Large-scale commercial application requires the ability to synthesize them in large quantities using simple, low-cost synthetic routes.

[0005] For example, CN108794513A discloses a green phosphorescent cuprous complex luminescent material comprising a crystalline mixture of a bisphosphine ligand and a nitrogen-containing heterocyclic ligand. This cuprous complex luminescent material exhibits excellent luminescence performance and thermal stability. Its green phosphorescent luminescence intensity is high, its thermal stability is good, and its luminescence decay characteristics are highly consistent with the requirements of OLED devices for the phosphorescent luminescence lifetime of the material. Its application in OLED light-emitting layer materials is beneficial for reducing product costs. However, its preparation process is complex, requiring a five-step synthesis process, which is not conducive to its large-scale commercial application.

[0006] The valence electron configuration of phosphorus is 3s 2 3p 3 , when losing 3p 3 After the electron, the electronic configuration of trivalent P is 3s 2 , 3s 2The lone pair of electrons can act as an effective electron donor. 2 and 3p 3 Electrons, when oxidized to become pentavalent P (or arylated / alkylated to become phosphonium salts), can serve as electron acceptors. Currently, there are very few literature reports on the use of pentavalent phosphonium as an electron acceptor. Triphenylphosphonium is a very suitable electron acceptor, and its electron acceptance capacity is significantly stronger than that of its analogue phosphine oxide. Currently reported P-based organic light-emitting molecules often use a pentavalent P core as an electron acceptor, and a N-containing group with a lone pair of electrons as an electron-donating structure. However, for now, if the N-containing electron donor and the phosphonium salt electron acceptor are assembled into one molecule, it often requires more complicated synthesis steps and the use of precious metal catalysts, and the raw material cost is also high, making it difficult to synthesize in large quantities. How to design a luminescent small molecule containing both a trivalent P electron donor and a pentavalent phosphonium electron acceptor in the same molecule through a simple one-step reaction has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0007] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a diphosphine donor acceptor luminescent material, a metal halide single crystal material, and a preparation method and application thereof. The synthesized diphosphine donor acceptor luminescent material and metal halide single crystal material can be excited by near-infrared laser to produce bright green and yellow light emissions. The variable power upconversion spectrum shows that the upconversion mechanism is two-photon absorption.

[0008] To achieve the above object, in a first aspect of the present invention, the present invention provides a method for preparing a diphosphine donor-acceptor luminescent material, comprising the following steps:

[0009] In the presence of a solvent, 1,2-bis(diphenylphosphino)benzene and a halogenated compound are reacted to obtain a bisphosphine donor-acceptor luminescent material.

[0010] As a preferred embodiment of the present invention, the halogenated compound comprises at least one of halogenated alkanes and halogenated aromatic hydrocarbons. As a preferred embodiment of the present invention, the halogenated alkanes comprise at least one of halogenated methane, halogenated ethane, halogenated propane, halogenated butane, halogenated pentane, halogenated hexane, halogenated heptane and halogenated octane.

[0011] As a preferred embodiment of the present invention, the halogenated aromatic hydrocarbon includes at least one of halogenated benzyl, halogenated phenyl ethyl, halogenated phenyl propane, halogenated phenyl butane, halogenated phenyl pentane, halogenated phenyl hexane, halogenated phenyl heptane and halogenated phenyl octane.

[0012] As a preferred embodiment of the present invention, the solvent includes at least one of toluene, tetrahydrofuran, N,N-dimethylformamide, N-methylpyrrolidone, n-hexane, n-octane, propylene carbonate, acetone, 1,4-butyrolactone and dimethylacetamide.

[0013] As a preferred embodiment of the present invention, the molar ratio of the halogenated compound to 1,2-bis(diphenylphosphino)benzene is ≥1.

[0014] As a preferred embodiment of the present invention, the method further comprises the steps of filtering and drying after the reaction.

[0015] In the second aspect of the present invention, the present invention provides the use of the diphosphine donor-acceptor luminescent material prepared by the preparation method described above in light-emitting diodes, optical temperature measurement, luminescent anti-counterfeiting, scintillation, up-conversion, and solid-state lighting.

[0016] In a third aspect of the present invention, the present invention provides a method for preparing a metal halide single crystal material, comprising the following steps:

[0017] dissolving a diphosphine donor-acceptor luminescent material in an organic solvent to obtain a first solution;

[0018] dissolving a metal halide or a metal oxide in a hydrohalic acid to obtain a second solution;

[0019] The first solution and the second solution are mixed evenly, allowed to stand to grow crystals, filtered, and dried to obtain a metal halide single crystal material;

[0020] The diphosphine donor-acceptor luminescent material is prepared by the above-mentioned preparation method.

[0021] As a preferred embodiment of the present invention, the organic solvent includes at least one of methanol, ethanol and propanol;

[0022] The metal component of the metal halide or metal oxide is zinc, manganese, copper, antimony, indium, zirconium, bismuth, lead or tin;

[0023] The halogen component of the metal halide is chlorine, bromine or iodine;

[0024] The hydrohalic acid is hydrochloric acid, hydrobromic acid or hydroiodic acid.

[0025] As a preferred embodiment of the present invention, the solid-liquid ratio of the bisphosphine donor-acceptor luminescent material and the organic solvent is 1 mmol: (10-100) ml.

[0026] As a preferred embodiment of the present invention, the solid-to-liquid ratio of the metal halide / metal oxide and hydrobromic acid is 1 mmol: (2-20) ml.

[0027] In the fourth aspect of the present invention, the present invention provides applications of the single crystal material obtained by the preparation method described above in light-emitting diodes, optical temperature measurement, luminescent anti-counterfeiting, up-conversion, and solid-state lighting.

[0028] The beneficial effects of the present invention are as follows: (1) the present invention uses 1,2-bis(diphenylphosphino)benzene as a substrate and reacts with a halogenated compound in a one-step reaction, and the final product is a bisphosphine donor-acceptor luminescent material in which trivalent phosphine and pentavalent phosphonium coexist. The synthesized bisphosphine donor-acceptor luminescent material uses trivalent phosphine as an electron donor and pentavalent phosphonium salt as an electron acceptor, and phosphorus element is simultaneously used as an electron donor and an acceptor in the same molecule. The synthesized molecule emits bright visible light under ultraviolet light excitation, and the luminescence mechanism is attributed to thermally activated delayed fluorescence; (2) a large number of crystals can be obtained by dissolving the bisphosphine donor-acceptor luminescent material in an organic solvent, dissolving a metal halide / metal oxide in hydrobromic acid, and then mixing the two solutions and allowing them to stand. For example, in the synthesized Zn-based metal halide single crystal material, a Zn metal center is coordinated with three Zn and an organic molecule (the organic molecule is brought by the organic solvent) to form a tetrahedral cluster, and the phosphonium salt cation is filled between the tetrahedrons to form a zero-dimensional structure. The synthesized zinc-based metal halide exhibits yellow light emission under ultraviolet light excitation, and the emission spectrum is red-shifted compared to the raw material, indicating that in the metal halide framework, the metal halide cluster can regulate the luminescence behavior of the cationic component; (3) The synthesized diphosphine donor-acceptor luminescent material and metal halide single crystal material can be excited by near-infrared laser to produce bright green and yellow light emissions, and the variable power upconversion spectrum shows that its upconversion mechanism is two-photon absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a single crystal structure diagram of the diphosphine donor-acceptor luminescent material synthesized in Example 1;

[0030] Figure 2 This is an emission spectrum of the diphosphine donor-acceptor luminescent material synthesized in Example 1;

[0031] Figure 3 The temperature-variable steady-state luminescence spectrum position (a) and temperature-variable transient luminescence spectrum (b) of the diphosphine donor-acceptor luminescent material synthesized in Example 1.

[0032] Figure 4 The temperature-varying physical photograph (a) and temperature-varying color coordinates (b) of the diphosphine donor-acceptor luminescent material synthesized in Example 1.

[0033] Figure 5 The single crystal structure of the diphosphine donor-acceptor luminescent material synthesized in Example 2;

[0034] Figure 6 This is an emission spectrum of the diphosphine donor-acceptor luminescent material synthesized in Example 2;

[0035] Figure 7 The temperature-dependent steady-state luminescence spectrum (a) and temperature-dependent emission peak position (b) of the diphosphine donor-acceptor luminescent material synthesized in Example 3;

[0036] Figure 8 A diagram showing the single crystal structure of the metal halide single crystal material synthesized in Example 4;

[0037] Figure 9 The temperature-dependent steady-state luminescence spectrum (a) and temperature-dependent emission peak position (b) of the metal halide single crystal material synthesized in Example 4;

[0038] Figure 10 The up-conversion spectrum (a) and variable power spectrum (b) of the diphosphine donor-acceptor luminescent material synthesized in Example 1 and the metal halide single crystal material synthesized in Example 4 are shown. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present invention, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0043] In the present invention, when referring to numerical ranges, unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values of the range, as well as every value between such minimum and maximum values. Furthermore, when a range refers to an integer, every integer between the minimum and maximum values of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges subsumed therein.

[0044] In the present invention, there is no particular limitation on the specific filtering, drying, dispersing and stirring treatment methods.

[0045] In the present invention, unless otherwise stated, all parts are parts by weight.

[0046] In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0047] The present invention provides a method for preparing a bisphosphine donor-acceptor luminescent material, comprising the following steps:

[0048] In the presence of a solvent, 1,2-bis(diphenylphosphino)benzene and a halogenated compound are reacted to obtain a bisphosphine donor-acceptor luminescent material.

[0049] The present invention uses 1,2-bis(diphenylphosphino)benzene as a substrate and carries out a one-step reaction with a halogenated compound. The final product obtained is a bisphosphine donor-acceptor luminescent material in which trivalent phosphine and pentavalent phosphonium coexist. The synthesized bisphosphine donor-acceptor luminescent material uses trivalent phosphine as an electron donor and pentavalent phosphonium salt as an electron acceptor, and phosphorus element is simultaneously used as an electron donor and an acceptor in the same molecule. The synthesized molecule emits bright visible light under ultraviolet light excitation, and the luminescence mechanism is attributed to thermally activated delayed fluorescence.

[0050] It can be excited by near-infrared laser to produce bright green and yellow light emissions, and the variable power upconversion spectrum shows that its upconversion mechanism is two-photon absorption.

[0051] The preparation method of the present invention has a very simple synthetic route, a high yield, and has the potential for commercial application.

[0052] In one embodiment, the halogenated compound includes at least one of a halogenated alkane and a halogenated aromatic hydrocarbon.

[0053] In one embodiment, the halogenated alkane comprises at least one of a halogenated methyl ethane, a halogenated ethyl ethane, a halogenated propyl ane, a halogenated butyl ane, a halogenated pentane, a halogenated hexane, a halogenated heptane, and a halogenated octane.

[0054] In one embodiment, the halogenated aromatic hydrocarbon includes at least one of halogenated benzyl, halogenated phenyl ethyl, halogenated phenyl propane, halogenated phenyl butane, halogenated phenyl pentane, halogenated phenyl hexane, halogenated phenyl heptane and halogenated phenyl octane.

[0055] In one embodiment, the solvent includes at least one of toluene, tetrahydrofuran, N,N-dimethylformamide, N-methylpyrrolidone, n-hexane, n-octane, propylene carbonate, acetone, 1,4-butyrolactone and dimethylacetamide.

[0056] In one embodiment, the molar ratio of the halogenated compound to 1,2-bis(diphenylphosphino)benzene is ≥1.

[0057] It should be noted that there is no specific limitation on the amount of solvent added, as long as the amount of solvent added can completely dissolve 1,2-bis(diphenylphosphino)benzene.

[0058] In one embodiment, the method further comprises the steps of filtering and drying after the reaction.

[0059] Among them, filtration and drying are conventional technical means in this field. Filtration can be carried out by suction filtration or filtration with filter paper or filter cloth, as long as the purpose of filtration is achieved. Drying can be carried out by oven drying, natural drying or heated air drying, as long as the purpose of drying is achieved.

[0060] One embodiment of the present invention provides the application of the diphosphine donor-acceptor luminescent material prepared by the above preparation method in light-emitting diodes, optical temperature measurement, luminescent anti-counterfeiting, up-conversion, and solid-state lighting.

[0061] An embodiment of the present invention provides a method for preparing a metal halide single crystal material, comprising the following steps:

[0062] dissolving a diphosphine donor-acceptor luminescent material in an organic solvent to obtain a first solution;

[0063] dissolving the metal halide / metal oxide in halogen acid to obtain a second solution;

[0064] The first solution and the second solution are mixed evenly, allowed to stand to grow crystals, filtered, and dried to obtain a metal halide single crystal material;

[0065] Wherein, the diphosphine donor-acceptor luminescent material is prepared by the above-mentioned preparation method.

[0066] A large number of crystals are obtained by dissolving a diphosphine donor-acceptor luminescent material in an organic solvent, dissolving a metal halide or a metal oxide in a hydrohalic acid, and then mixing the two solutions and allowing them to stand.

[0067] In one embodiment, the organic solvent comprises at least one of methanol, ethanol and propanol;

[0068] The metal component of the metal halide or metal oxide is zinc, manganese, copper, antimony, indium, zirconium, bismuth, lead or tin;

[0069] The halogen component of the metal halide is chlorine, bromine or iodine;

[0070] The hydrohalic acid is hydrochloric acid, hydrobromic acid or hydroiodic acid.

[0071] In one embodiment, the solid-liquid ratio of the bisphosphine donor-acceptor luminescent material and the organic solvent is 1 mmol: (10-100) ml.

[0072] In one embodiment, the solid-liquid ratio of metal halide / metal oxide and hydrohalic acid is 1 mmol: (2-20) ml.

[0073] One embodiment of the present invention provides applications of the single crystal material prepared by the above-mentioned preparation method in light-emitting diodes, optical temperature measurement, luminescent anti-counterfeiting, up-conversion, and solid-state lighting.

[0074] The following examples are provided to facilitate understanding of the present invention. These examples are not provided to limit the scope of the claims.

[0075] Example 1

[0076] A method for preparing a bisphosphine donor-acceptor luminescent material (benzyl-substituted bisphosphine bromide salt) comprises the following steps:

[0077] 4 mmol of 1,2-bis(diphenylphosphino)benzene and 8 mmol of benzyl bromide were added to 60 mL of toluene solvent, and the reaction system was refluxed at 120° C. As the reaction proceeded, a white precipitate gradually formed. The obtained white precipitate was filtered, and the mother liquor was removed. The obtained product was washed with toluene several times and dried to obtain a benzyl-substituted bisphosphine bromide salt.

[0078] The single crystal structure of the product can be analyzed by X-ray single crystal diffraction technology, such as Figure 1 As shown, it is a single crystal structure diagram of the benzyl-substituted bisphosphine bromide salt product. The product contains two P nuclei, one of which is connected to a benzyl group, and the other P is still connected to three benzene rings.

[0079] like Figure 2 As shown, the synthesized benzyl-substituted bisphosphine bromide exhibits green light emission under ultraviolet light excitation, with an emission peak at 522 nm; the broad emission spectrum indicates the existence of charge transfer between the electron donor and the acceptor, wherein the trivalent phosphine acts as the electron donor and the pentavalent phosphonium nucleus acts as the electron acceptor, and the electron donor and the acceptor are connected by a benzene ring to form a host-guest structure within the molecule.

[0080] Figure 3The temperature-dependent spectrum of the benzyl-substituted bisphosphine bromide product shows a Z-shaped emission peak position as the temperature changes. At low temperatures, the emission peak position red-shifts to 558 nm. After double exponential fitting, the temperature-dependent transient luminescence decay curve at low temperatures gives an average lifetime of 4284 μs. The average lifetime at room temperature is 56 μs, which is about 76 times that at room temperature. This verifies that the luminescence mechanism of the benzyl-substituted bisphosphine bromide product is thermally activated delayed fluorescence. The temperature change is accompanied by changes in the sample's luminescence color, such as Figure 4 As shown, it demonstrates its application potential in the field of remote optical temperature measurement.

[0081] Example 2

[0082] A method for preparing a diphosphine donor-acceptor luminescent material (benzyl-substituted iodide) comprises the following steps:

[0083] 4 mmol of 1,2-bis(diphenylphosphino)benzene and 4 mmol of iodobenzyl were added to 60 mL of toluene solvent, and the reaction system was refluxed at 120°C. As the reaction proceeded, a white precipitate was gradually generated. The obtained white precipitate was filtered and the mother liquor was removed. The obtained product was washed with toluene several times and dried to obtain a benzyl-substituted iodine product.

[0084] Its structure was determined by single crystal diffraction, in which one of the P groups was connected to a benzyl group, and the cations were separated by iodide ions ( Figure 5 Benzyl-substituted iodides exhibit green emission under ultraviolet excitation, but the emission spectrum is red-shifted compared to the spectrum of benzyl-substituted bisphosphine bromide products ( Figure 6 ).

[0085] Example 3

[0086] A method for preparing a bisphosphine donor-acceptor luminescent material (propyl-substituted bromide) comprises the following steps:

[0087] 4 mmol of 1,2-bis(diphenylphosphino)benzene and 8 mmol of bromopropane were mixed in 60 mL of toluene and refluxed. The reaction system was refluxed at 120° C. As the reaction proceeded, a white precipitate was gradually generated. The obtained white precipitate was filtered to remove the mother liquor. The obtained product was washed with toluene several times and dried to obtain a propyl-substituted bromide.

[0088] like Figure 7 As shown, the emission peak of the obtained product under ultraviolet light excitation is located at 548nm. As the temperature gradually decreases, the emission spectrum red-shifts from 548nm to 601nm. The change of its emission peak position with temperature also presents a Z-shape, demonstrating its application potential in the field of optical temperature measurement.

[0089] Example 4

[0090] A method for preparing a synthetic metal halide single crystal material (Zn-based halide single crystal) comprises the following steps:

[0091] 0.5 mmol of the benzyl-substituted bisphosphine bromide synthesized in Example 1 was dissolved in 20 ml of ethanol to obtain a first solution;

[0092] Dissolve 0.5 mmol of ZnBr2 in 2 mL of hydrobromic acid to obtain a second solution;

[0093] The first solution and the second solution are mixed evenly to obtain a growth precursor solution of a Zn-based halide single crystal. The solution is then allowed to stand for 3 hours to grow a large number of crystals, which are then dried to obtain a metal halide single crystal material.

[0094] like Figure 8 As shown, the crystal structure of the obtained Zn-based halide single crystal was determined by X-ray single crystal diffraction technology. The results showed that one of the Zn metal centers coordinated with three Zn and one ethanol molecule to form a tetrahedral cluster, and the phosphonium salt cations filled between the tetrahedra to form a zero-dimensional structure.

[0095] like Figure 9 As shown, the synthesized zinc-based metal halide exhibits yellow light emission under ultraviolet light excitation, and the emission spectrum is red-shifted compared to the raw material, indicating that in the metal halide framework, the metal halide cluster can regulate the luminescence behavior of the cationic component.

[0096] The benzyl-substituted bisphosphine bromide salt synthesized in Example 1 and the Zn-based halide single crystal synthesized in this example were placed in front of a near-infrared laser. It was found that both the benzyl-substituted phosphine bromide salt and the Zn-based metal halide could be excited by the near-infrared laser to produce bright green and yellow light emissions. The up-conversion spectrum with varying power showed that the up-conversion mechanism was two-photon absorption ( Figure 10 Upconversion luminescence has very important applications in anti-counterfeiting, information storage, and warning signs, indicating that benzyl-substituted bromides and Zn-substituted metal halides can be used in upconversion luminescence.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a diphosphine donor-acceptor luminescent material, characterized in that: The following steps are involved: In the presence of a solvent, 1,2-bis(diphenylphosphino)benzene and a halogenated compound are reacted to obtain a bisphosphine donor-acceptor luminescent material in which trivalent phosphine and pentavalent phosphine coexist; The halogenated compound is at least one of benzyl bromide, benzyl iodide, and bromopropane.

2. The method for preparing the bisphosphine donor-acceptor luminescent material according to claim 1, wherein: The solvent includes at least one of toluene, tetrahydrofuran, N,N-dimethylformamide, N-methylpyrrolidone, n-hexane, n-octane, propylene carbonate, acetone, 1,4-butyrolactone and dimethylacetamide.

3. The method for preparing the bisphosphine donor-acceptor luminescent material according to claim 1, wherein: The molar ratio of the halogenated compound to 1,2-bis(diphenylphosphino)benzene is ≥1.

4. The method for preparing the bisphosphine donor-acceptor luminescent material according to claim 1, wherein: The method further comprises the steps of filtering and drying after the reaction.

5. Use of the diphosphine donor-acceptor luminescent material prepared by the preparation method according to any one of claims 1 to 4 in light-emitting diodes, optical temperature measurement, luminescent anti-counterfeiting, scintillation, up-conversion, and solid-state lighting.

6. A method for preparing a metal halide single crystal material, characterized in that: The following steps are involved: dissolving a diphosphine donor-acceptor luminescent material in an organic solvent to obtain a first solution; dissolving a metal halide in a hydrohalic acid to obtain a second solution; The first solution and the second solution are mixed evenly, allowed to stand to grow crystals, filtered, and dried to obtain a metal halide single crystal material; The diphosphine donor-acceptor luminescent material is prepared by the preparation method according to any one of claims 1 to 4; The organic solvent is ethanol; The metal halide is ZnBr2; The hydrohalic acid is hydrobromic acid.

7. The method for preparing a metal halide single crystal material according to claim 6, wherein: The solid-liquid ratio of the diphosphine donor-acceptor luminescent material and the organic solvent is 1 mmol: (10-100) ml; and / or The solid-liquid ratio of the metal halide and the hydrohalic acid is 1 mmol: (2-20) ml.

8. Application of the single crystal material obtained by the preparation method according to any one of claims 6 to 7 in light-emitting diodes, optical temperature measurement, luminescent anti-counterfeiting, scintillation, up-conversion, and solid-state lighting.

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