8-hydroxyquinoline / benzophenone type samarium-containing polymer complex light conversion agent as well as preparation method and application of 8-hydroxyquinoline / benzophenone type samarium-containing polymer complex light conversion agent

Abstract

The invention discloses an 8-hydroxyquinoline / benzophenone type samarium-containing polymer complex light conversion agent as well as a preparation method and application thereof, and belongs to the technical field of organic macromolecular luminescent materials. The molecular general formula of the 8-hydroxyquinoline / benzophenone type samarium-containing polymer complex light conversion agent is Sm (baapn) (hq) (phen) 2-co-A, sm is a Sm < 3 + > central coordination ion; the bp < n > is 2-hydroxy-4-propenyloxy benzophenone, and the bp < n > is 2-hydroxy-4- Hq is 8-hydroxyquinoline; phen is o-phenanthroline; a is an acrylate compound. And the double ultraviolet absorbers can absorb ultraviolet rays of 320-400 nm and 280-320 nm, so that a comprehensive protection effect is achieved. The rare earth samarium can convert ultraviolet rays into visible light which is easier to utilize by plants, promote photosynthesis and improve crop yield. Plants can be protected from being damaged by ultraviolet rays, ultraviolet light unfavorable for plant growth can be converted into red light beneficial to photosynthesis, and the yield and quality of crops are improved; the problems of low compatibility and thermal stability of a micromolecular complex light conversion agent and an agricultural film and limited light conversion efficiency are effectively solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of organic macromolecular luminescent materials, and particularly relates to a preparation method of 8-hydroxyquinoline / benzophenone type high polymer complex containing samarium light conversion agent. BACKGROUND

[0002] Rare earth elements are lanthanide metals, which have wide and important applications in material science, catalysis, electronics and other high-tech fields due to their unique optical, electromagnetic and chemical properties, and are known as "industrial vitamins". Rare earth elements exhibit a series of special optical and chemical properties due to their unique 4f electron layer structure. The 4f orbit electrons are located in the inner layer and are shielded by the outer layer 5s²5p 6 electronic shell, so the behavior of the 4f electrons is relatively independent. This special electronic shell structure endows rare earth elements with many unique properties, especially in the field of optics. Therefore, researchers have further developed light conversion agents that can convert incident light into visible light that plants can easily utilize. When added to agricultural films, it not only improves photosynthesis efficiency, promotes crop growth, advances the maturation period of crops, and increases yield, but also reduces the damage of ultraviolet rays to agricultural films and crops. This new type of agricultural film not only improves the yield and quality of crops, but also promotes the development of sustainable agriculture.

[0003] Single ultraviolet light absorbers can only absorb a specific waveband of ultraviolet light, have a fast photodegradation rate, a relatively short absorption range, and cannot provide broad-spectrum protection. In scenarios requiring comprehensive ultraviolet protection, the effect of single ultraviolet light absorbers is not ideal. Dual ultraviolet light absorbers can simultaneously absorb UVA and UVB, protecting materials from a wider range of ultraviolet damage, improving light stability, effectively reducing the degradation of materials by ultraviolet light, and increasing the service life of agricultural films.

[0004] In view of the technical problems of poor light stability, small absorption range and fast fluorescence intensity decay of single ultraviolet light absorbers in existing light conversion agents, there is an urgent need to find a new type of light conversion agent that can effectively increase the luminous intensity and thermal stability of the light conversion agent, improve the photosynthesis efficiency of crops, and improve agricultural yield and energy utilization. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide an 8-hydroxyquinoline / benzophenone type high polymer complex containing samarium light conversion agent and method and application, to solve the technical problems of poor light stability, small absorption range and fast fluorescence intensity decay of single ultraviolet light absorbers in existing light conversion agents.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: The application discloses an 8-hydroxyquinoline / benzophenone type samarium-containing high-molecular complex light conversion agent, and a preparation method of the 8-hydroxyquinoline / benzophenone type samarium-containing high-molecular complex light conversion agent. In the formula, Sm is Sm 3+ a central coordination ion; bapn is 2-hydroxy-4-propenyl benzophenone; hq is 8-hydroxyquinoline; phen is o-phenanthroline; and A is an acrylate compound. bapn, hq and phen are ligands.

[0007] Preferably, the acrylate compound is any one of methyl acrylate, methyl methacrylate, ethyl acrylate and 2-methyl ethyl acrylate.

[0008] The application further discloses a preparation method of the 8-hydroxyquinoline / benzophenone type samarium-containing high-molecular complex light conversion agent. 1) adding 8-hydroxyquinoline solution into a samarium ion solution, adjusting the pH value to 6-7, and then adding 2-hydroxy-4-propenyl benzophenone solution after heating and stirring reaction, adjusting the pH value to 7-8, and then adding o-phenanthroline solution after heating and stirring reaction, filtering, washing and vacuum drying to obtain a samarium-containing rare earth complex; 2) dissolving the samarium-containing rare earth complex in N,N-dimethylformamide, then adding an acrylate compound and an initiator, and then heating and stirring reaction under an inert atmosphere, and then dropping methanol under intense stirring to obtain flocculent precipitates, filtering, dissolving in N,N-dimethylformamide again, then dropping methanol to form a viscous high-molecular compound, and then filtering, washing and drying to obtain the 8-hydroxyquinoline / benzophenone type samarium-containing high-molecular complex light conversion agent.

[0009] Preferably, the samarium ion solution is prepared by dissolving samarium chloride in ethanol; the use amount ratio of samarium chloride, 8-hydroxyquinoline, 2-hydroxy-4-propenyl benzophenone, o-phenanthroline, the samarium-containing rare earth complex, N,N-dimethylformamide, the acrylate compound and the initiator is (0.30-0.70) g:(0.10-0.20) g:(0.20-0.30) g:(0.20-0.30) g:(0.10-0.40) g:(10-15) mL:(1-4) mL:(0.02-0.03) mg.

[0010] Further preferably, the molar ratio of 2-hydroxy-4-propenyl benzophenone, 8-hydroxyquinoline, o-phenanthroline and Sm 3+ in the samarium ion solution is 1:1:2:1.

[0011] Preferably, in step 1), the samarium ion solution is prepared by dissolving 0.3-0.7 g of Sm2O3 in 10-20 mL of concentrated hydrochloric acid, heating until the concentrated hydrochloric acid is completely evaporated to obtain samarium chloride powder, and then dissolving the samarium chloride powder in anhydrous ethanol; the heating temperature is 90-100℃, and the heating time is 1-2 h. 8-Hydroxyquinoline solution is prepared by dissolving 8-hydroxyquinoline in ethanol; The 2-hydroxy-4-propenoxybenzophenone solution was prepared by dissolving 2-hydroxy-4-propenoxybenzophenone in ethanol; The o-phenanthroline solution is prepared by dissolving o-phenanthroline in ethanol.

[0012] Preferably, in step 1), an acid-binding agent is added to maintain the pH value within a preset range during the reaction process. The acid-binding agent is sodium hydroxide or diisopropylethylamine.

[0013] Preferably, in step 1), the temperature of the heating and stirring reaction is 80-100℃, and the time of the heating and stirring reaction is 1-1.5h.

[0014] Preferably, in step 2), the initiator is benzoyl peroxide; the inert atmosphere is nitrogen; the heating and stirring reaction temperature is 60-70℃, and the heating and stirring reaction time is 8-12h.

[0015] This invention also discloses the application of the above-mentioned 8-hydroxyquinoline / benzophenone type samarium-containing polymeric light-converting agent in the preparation of agricultural film materials.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses an 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent. This rare-earth samarium organic macromolecular complex light-converting agent has the general molecular formula: Sm(bapn)(hq)(phen)2-co-A; bapn, hq, and phen are ligands, wherein bapn is 2-hydroxy-4-propenoxybenzophenone; hq is 8-hydroxyquinoline; phen is o-phenanthroline; and A is an acrylate compound. Using 2-hydroxy-4-propenoxybenzophenone (bapn) as the main photosensitizing ligand, the propenoxy group acts as the active group, which can further participate in the polymerization reaction to form a cross-linked structure. The hydroxyl group can react with metal ions (such as Sm...). 3+ The π-coordinates of baphan form stable complexes. Furthermore, the conjugated π-system of baphan enables it to efficiently absorb ultraviolet light, entering an excited state (a higher energy state). The energy of this excited state can be transferred to rare earth ions (such as Sm) via intramolecular nonradiative transitions or energy transfer. 3 +8-Hydroxyquinoline (hq) provides coordination sites for the oxygen atom on the hydroxyl group and the nitrogen atom on the quinoline ring. This bifunctional coordination ability allows hq to form stable chelate complexes with metal ions. phen, as an auxiliary ligand, has two nitrogen atoms that can react with rare earth ions (Sm... 3+ This forms a stable chelate complex. The chelating effect of this polydentate ligand enhances the coordination stability of the complex, and its rigid planar structure can effectively shield water molecules from Sm. 3+ The quenching effect of Sm+, combined with the enhanced intermolecular forces through π-π stacking, inhibits molecular aggregation, resulting in more uniform dispersion of rare earth complexes in solution or solid, thereby improving the processability and optical properties of the material. Sm+ is covalently bonded to... 3+ The complex polymerizes with acrylate compounds to form a polymer backbone-side chain gradient structure; inhibiting Sm 3+ Ion migration reduces the risk of heavy metal leakage; it eliminates the defects of easy precipitation and poor compatibility of small molecule complexes, forming a molecular-level interpenetrating network with agricultural film substrates; steric hindrance hinders non-radiative transition channels, thus improving the quantum yield of photoluminescence. Dual UV absorbers can simultaneously absorb UVA and UVB, converting ultraviolet light into red light that is more easily absorbed by plants, thereby reducing UV damage to plants and agricultural films. Dual UV absorbers effectively shield harmful ultraviolet rays, protecting crops from UV damage, promoting plant photosynthesis, and improving crop quality. Dual UV absorbers also protect agricultural films from UV damage, extending film lifespan, reducing replacement costs, and reducing agricultural waste generation. Through molecular engineering design of the bapn ligand, its UV absorption band highly overlaps with the UV-B band in the solar spectrum, resulting in high absorption efficiency. Energy transfer to Sm 3+ Subsequently, the emission peak is located at 641 nm, which has a high energy level matching with the chlorophyll a / b absorption peak, resulting in high light energy utilization efficiency. The glass transition temperature and thermal decomposition temperature of the polymer backbone meet the requirements of high-temperature processing and long-term outdoor use of agricultural films. This invention synthesizes a dual ultraviolet macromolecular complex with 8-hydroxyquinoline as a crosslinking agent. This light-converting agent can convert ultraviolet light, which is detrimental to plant growth, into red light, which is beneficial to photosynthesis, thereby improving crop yield and quality. The bonded structure formed by the small molecule complex and acrylates not only gives the light-converting agent better weather resistance, enabling it to maintain its function for a longer period of time and making it less susceptible to degradation or inactivation by environmental factors, but also avoids aggregation, improving photostability and conversion efficiency. In addition, the dual ultraviolet absorber has a wider ultraviolet absorption band, which can not only improve the light utilization rate of plants, but also prevent plant diseases and pests and prevent the aging of substrate materials. Therefore, the dual-UV polymer rare earth light-converting agent prepared by this invention can effectively solve the problems of poor photostability, small absorption range, and rapid fluorescence intensity decay of single-UV complex light-converting agents, and the light conversion of the dual-UV light-converting agent is significantly improved.

[0017] Furthermore, the samarium-containing dual-UV light-converting polymeric complex light-converting agent prepared in this invention converts into red light at 620-670 nm under UV excitation, and exhibits a strong fluorescence emission peak at 641 nm in the red light region. By converting ultraviolet light into red light (especially at a wavelength close to the chlorophyll absorption band of 643 nm), the efficiency of light energy utilization by plants can be effectively improved. The dual-UV light-converting polymeric light-converting agent prepared in this invention can effectively convert ultraviolet light or other invisible light from sunlight into visible light wavelengths that plants can utilize efficiently, thereby improving the photosynthetic efficiency of crops and effectively increasing agricultural yield and addressing energy utilization issues.

[0018] This invention also discloses a method for preparing the above-mentioned 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent, which employs a stepwise coordination method, firstly completing the Sm... 3+ Precise coordination with BAPN, HQ, and phen avoids the problem of uneven coordination caused by direct polymerization. The N,N-dimethylformamide (DMF) solvent system is compatible with agricultural film processing technologies (casting, blow molding), requiring no additional impurity removal steps and allowing direct blending and granulation. A pH of 6-7 promotes the deprotonation of BAPN to form a stable five-membered ring chelate; a pH of 7-8 activates the hydroxyl coordination ability of HQ; triple reflux ensures the rigidity of the phen plane and its alignment with Sm. 3+ Axial coordination. Polymerization under a nitrogen atmosphere can suppress the oxygen inhibition effect in the free radical polymerization of acrylates, effectively improving the polymer conversion rate. This invention adopts a pre-coordination followed by polymerization synthesis method. First, rare earth metal ions are coordinated with monomers to form rare earth organic complexes, and then a polymerization reaction is carried out to generate the final bonded dual-UV rare earth polymer light-converting agent. This improves the consistency and functionality of the material, avoids concentration quenching, and has good compatibility with agricultural films. It not only promotes the development of related industries, but also provides new ideas and methods for solving energy crises and environmental problems.

[0019] This invention also discloses the application of the above-mentioned 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent in the preparation of agricultural film materials. The light conversion performance of the dual-UV samarium-containing polymeric complex light-converting agent prepared by this invention is superior to that of the prepared small-molecule complex light-converting agent and the single-UV complex light-converting agent, with a significant increase in fluorescence intensity. Through thermogravimetric analysis, the polymeric complex light-converting agent has good heat resistance and is expected to be used in the field of agricultural films. By efficiently converting ultraviolet light into red light (641 nm) that highly matches the absorption peak of plant chlorophyll, it significantly improves photosynthetic efficiency. Its bonded polymer structure endows the agricultural film with excellent heat resistance, resistance to photoaging, and mechanical properties, effectively solving the problems of easy precipitation and poor thermal stability of traditional small-molecule light-converting agents, while avoiding the risk of heavy metal ion migration, thus meeting environmental protection requirements. The use of dual ultraviolet light absorbers enables the light-converting agent to have a wider absorption band, effectively improving the light conversion performance and photostability of the light-converting agent. This light-converting agent has excellent compatibility with agricultural film substrates, and only a low addition amount is needed to achieve long-term spectral regulation function. While extending the service life of agricultural film, it improves crop yield and quality by optimizing light conditions, providing a high-performance and environmentally friendly light functional material solution for modern agriculture. Attached Figure Description

[0020] Figure 1 The excitation range test diagrams of the intermediate product Sm(bapn)(hq)(phen)2 containing samarium rare earth complex and the final product 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex Sm(bapn)(hq)(phen)2-co-MA prepared in Example 1 of the present invention under excitation at an emission wavelength of 640 nm are shown. Figure 2 The emission range test diagrams of the intermediate product Sm(bapn)(hq)(phen)2 containing samarium rare earth complex and the final product 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex Sm(bapn)(hq)(phen)2-co-MA obtained in Example 1 of this invention under excitation wavelength of 320 nm are shown. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Unless otherwise specified, all embodiments and preferred embodiments mentioned herein can be combined to form new technical solutions.

[0023] Unless otherwise specified, all the technical features and preferred features mentioned herein can be combined to form new technical solutions.

[0024] In this invention, unless otherwise specified, percentage (%) or parts refer to weight percentage or parts relative to the composition.

[0025] Unless otherwise specified, the components or preferred components involved in this invention can be combined with each other to form new technical solutions.

[0026] In this invention, unless otherwise specified, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "6~22" indicates that all real numbers between "6~22" have been listed in this document, and "6~22" is simply a shortened representation of these numerical combinations.

[0027] The "scope" disclosed in this invention can be in the form of a lower limit and an upper limit, and can be one or more lower limits and one or more upper limits, respectively.

[0028] In this invention, the term "and / or" as used herein refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes such combinations.

[0029] In this invention, unless otherwise stated, the various reactions or operation steps may be performed sequentially or in a particular order. Preferably, the reaction methods described herein are performed sequentially.

[0030] Unless otherwise stated, the technical and scientific terms used herein have the same meanings as those familiar to those skilled in the art. Furthermore, any methods or materials similar to or equivalent to those described herein may also be used in this invention.

[0031] This invention provides an 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent with the general molecular formula: Sm(bapn)(hq)(phen)2-co-A; In the formula, Sm is Sm 3+ The central coordinating ion; bapn, hq, and phen are ligands; bapn is 2-hydroxy-4-propenoxybenzophenone; hq is 8-hydroxyquinoline; phen is o-phenanthroline; A is an acrylate compound. bapn, hq, and phen are ligands.

[0032] The acrylate compound is any one of methyl acrylate, methyl methacrylate, ethyl acrylate and ethyl 2-methacrylate.

[0033] The 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent disclosed in this invention, through Sm3+ Through synergistic coordination with bapn, hq, and phen, and combined with the polymerization bonding of acrylate compounds, an innovative structure combining spectral conversion and polymeric stability was constructed. bapn efficiently absorbs ultraviolet light and transfers energy to Sm... 3+ The red light emitted matches the photosynthetic needs of plants; HQ acts as a cross-linking ligand to enhance the material's mechanical strength and heat resistance; Phen enhances coordination stability and inhibits heavy metal leakage. The bonded structure effectively solves the problems of easy precipitation and poor thermal stability of small-molecule light-converting agents, while avoiding aggregation and photoquenching, significantly extending functional lifespan and reducing environmental risks. Dual ultraviolet light absorption lengthens the absorption band of the light-converting agent, making its light-converting performance even better.

[0034] This invention also provides a method for preparing the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent, comprising the following steps: 1) Dissolve 0.10-0.20 g of 8-hydroxyquinoline in 10-20 mL of anhydrous ethanol, add it to the first beaker and stir to dissolve; control the pH value at 6-7; control the temperature at 80-100℃; heat and stir for 1-1.5 h; 2) Dissolve 0.20-0.30 g of 2-hydroxy-4-propenoxybenzophenone in 10-20 mL of anhydrous ethanol, add it to a second beaker and stir to dissolve; control the pH value at 7-8; control the temperature at 80-100℃; heat and stir for 1-1.5 h. 3) Dissolve 0.20-0.30g of o-phenanthroline in 10-20mL of anhydrous ethanol, add it to the third beaker, and stir to dissolve; control the temperature at 80-100℃; heat and stir for 1-1.5h. 4) The three ligand solutions obtained in steps 1), 2), and 3) are slowly added dropwise to 0.30-0.70 g samarium ion solution to obtain a mixed solution of ligand and samarium ion. During the process, the pH value of the system is controlled by an acid-binding agent. The reaction is kept at a constant temperature until the pH value remains unchanged. After stirring, a precipitate is obtained. The precipitate is filtered, washed, and vacuum dried at 60℃ for 24 h to obtain samarium-containing rare earth complex.

[0035] 5) Dissolve the samarium-containing rare earth complex prepared in step 4) in N,N-dimethylformamide (DMF). After stirring and dissolving, add an acrylate compound (MA). Heat to 60-70℃ under N2 environment and continue stirring. Add 0.02-0.03 mg of initiator benzoyl peroxide dissolved in 1-5 mL of DMF. Maintain constant temperature and continue stirring for 8-12 h, then stop heating. After the system cools to room temperature, add 50-100 mL of methanol dropwise to the reactants under vigorous stirring to obtain a flocculent precipitate. After filtration, dissolve the precipitate again with 20-30 mL of DMF. Add 50-100 mL of methanol again to obtain a flocculent precipitate. Filter and wash the precipitate, and dry it under vacuum at 60℃ for 24 h to obtain a benzophenone-type samarium-containing polymeric complex light-converting agent.

[0036] In step 4), the acid-binding agent is sodium hydroxide or diisopropylethylamine. The initiator is benzoyl peroxide.

[0037] An 8-hydroxyquinoline solution was added to a samarium ion solution, and the pH was adjusted to 6-7. After a first heating and stirring reaction, a 2-hydroxy-4-propenoxybenzophenone solution was added, and the pH was adjusted to 7-8. After a second heating and stirring reaction, an o-phenanthroline solution was added. After a third heating and stirring reaction, the mixture was filtered, washed, and vacuum dried to obtain a samarium-containing rare earth complex. The temperature of the first heating and stirring reaction was 80-100℃, and the time was 1-1.5 h; the temperature of the second heating and stirring reaction was 80-100℃, and the time was 1-1.5 h; the temperature of the third heating and stirring reaction was 80-100℃, and the time was 1-1.5 h.

[0038] Samarium ion solution is prepared by dissolving 0.3-0.7g of Sm2O3 in 10-20mL of concentrated hydrochloric acid, heating until the concentrated hydrochloric acid is completely evaporated, heating temperature is 90-100℃, heating time is 1-2h, to obtain samarium chloride powder; then dissolving the obtained samarium chloride powder in anhydrous ethanol as solvent.

[0039] DMF is N,N-dimethylformamide.

[0040] Sm in solutions of 2-hydroxy-4-propenoxybenzophenone, 8-hydroxyquinoline, o-phenanthroline and samarium ions 3+ The molar ratio is 1:1:2:1.

[0041] The method for preparing the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent disclosed in this invention employs a stepwise coordination and subsequent polymerization process, and achieves Sm by precisely controlling the pH gradient and reaction conditions. 3+Uniform molecular-level coordination with ligands avoids the coordination heterogeneity problems caused by direct polymerization. The pre-coordination followed by polymerization strategy significantly improves fluorescence quantum efficiency, suppresses concentration quenching, and utilizes an inert atmosphere to ensure efficient polymerization of acrylate compounds, forming a polymer network structure. This process is compatible with agricultural film processing procedures, requires no additional impurity removal steps, and allows for direct blending and granulation, reducing production costs while ensuring light conversion performance and improving industrial feasibility.

[0042] The 8-hydroxyquinoline / benzophenone-type samarium-containing polymeric complex light-converting agent disclosed in this invention, when applied to agricultural films, significantly improves photosynthetic efficiency and promotes crop growth and stress resistance by converting ultraviolet light into red light that plants can efficiently utilize. Its polymeric structure forms a stable interpenetrating network with agricultural film substrates, such as LDPE and EVA, enhancing the film material's heat resistance, aging resistance, tensile strength, and elongation at break, thus extending the film's service life. Low addition amounts can achieve long-lasting spectral regulation, meeting agricultural film transmittance and haze standards, and simultaneously improving crop yield and quality while satisfying modern agriculture's demand for environmentally friendly and highly efficient light-functional materials.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0044] Example 1 A method for preparing an 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent includes the following steps: 1) Accurately weigh 0.30 g of Sm2O3 and dissolve it in 10 mL of concentrated hydrochloric acid. Heat the solution at 90℃ for 1 h to remove excess concentrated hydrochloric acid. Then dilute the solution with 20 mL of anhydrous ethanol to obtain a samarium ion solution, i.e., SmCl3 solution.

[0045] 2) Accurately weigh 0.10g of 8-hydroxyquinoline (hq), 0.20g of 2-hydroxy-4-propenoxybenzophenone (bapn) and 0.20g of o-phenanthroline (phen) and dissolve them in 10mL of anhydrous ethanol, stirring to ensure complete dissolution, to prepare solution 1, solution 2 and solution 3.

[0046] 3) The prepared samarium ion solution was placed in a 250 mL three-necked flask. The temperature was raised to 80°C using an oil bath, and solution 1 was slowly added dropwise. After 1 hour of reaction, the pH was maintained at 6. Solution 2 was then slowly added to the mixture, and the reaction was continued for 1 hour. Finally, solution 3 was slowly added, and the reaction was stirred continuously for 1 hour after all additions were completed. After each addition, the pH was adjusted using 10% NaOH solution to maintain a pH of 7, and the reaction temperature was kept at 80°C. After cooling overnight, the mixture was filtered and washed five times with anhydrous ethanol. Finally, it was vacuum dried at 60°C for 24 hours to obtain the samarium-containing rare earth complex Sm(bapn)(hq)(phen)2.

[0047] 4) Take 0.15 g of dried Sm(bapn)(hq)(phen)2 into a 100 mL three-necked flask, add 10 mL of N,N-dimethylformamide (DMF), and after the complex is completely dissolved, add 1.0 mL of methyl acrylate (MA) and stir continuously until homogeneous. Heat to 65 °C under a nitrogen atmosphere under vacuum and stir continuously for 30 min. Add 0.02 mg of benzoyl peroxide dissolved in 1 mL of DMF dropwise using a syringe. Maintain the reaction for 8 h. After the reaction is complete, allow the system to cool to room temperature, and then slowly add the reactants dropwise to a methanol solution under vigorous stirring. A flocculent precipitate appears; filter, dry, dissolve in a small amount of DMF, and then dissolve again in methanol. Dry the filtered flocculent precipitate in a vacuum drying oven to obtain the final benzophenone-type samarium-containing polymeric complex optical converter Sm(bapn)(hq)(phen)2-co-MA.

[0048] Figure 1 The excitation range test diagrams for the intermediate product Sm(bapn)(hq)(phen)2 containing samarium rare earth complex and the final product 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex Sm(bapn)(hq)(phen)2-co-MA obtained in Example 1 of this invention are shown below under excitation wavelength of 640 nm. The excitation range of the above-mentioned transducer was tested using a Tokyo Japan F-4600 fluorescence spectrophotometer at an emission wavelength of 640 nm, and the results are as follows. Figure 1 As shown in the figure, the maximum excitation peak of the light-converting agent is located at 320 nm. The excitation of the light-converting agent is broadband, and the main absorption region is in the ultraviolet light region.

[0049] Figure 2The emission range test diagrams of the intermediate product Sm(bapn)(hq)(phen)2 containing samarium rare earth complex and the final product 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex Sm(bapn)(hq)(phen)2-co-MA prepared in Example 1 of this invention are shown under excitation wavelength of 320 nm. The emission range of the prepared light-converting agent was tested under excitation at 320 nm, and the results are as follows. Figure 2 As shown in the figure, under ultraviolet light excitation, the emission peak of the light-converting agent is mainly concentrated at 641 nm. Its characteristic emission spectrum is in good agreement with the photosynthetic spectrum of plants, which can effectively improve the light absorption rate of plants.

[0050] Example 2 A method for preparing a benzophenone-type samarium-containing polymeric complex light-converting agent includes the following steps: 1) Accurately weigh 0.4g of Sm2O3 and dissolve it in 15 mL of concentrated hydrochloric acid. Heat the solution at 93℃ for 1.5 h to remove excess concentrated hydrochloric acid. Then dilute the solution with 20 mL of anhydrous ethanol to obtain a samarium ion solution, i.e., SmCl3 solution.

[0051] 2) Accurately weigh 0.15 g of 8-hydroxyquinoline (hq), 0.23 g of 2-hydroxy-4-propenoxybenzophenone (bapn) and 0.24 g of o-phenanthroline (phen) and dissolve them in 17 mL of anhydrous ethanol. Stir to ensure complete dissolution and prepare solution 1, solution 2 and solution 3.

[0052] 3) The prepared samarium ion solution was placed in a 250 mL three-necked flask. The temperature was raised to 90°C using an oil bath, and solution 1 was slowly added dropwise. After 1 hour of reaction, the pH was maintained at 7. Solution 2 was then slowly added to the mixture, and the reaction was continued for 1 hour. Finally, solution 3 was slowly added, and the reaction was stirred continuously for 1.25 hours after all additions were completed. After each addition, the pH was adjusted using 10% NaOH solution to maintain a pH of 8, and the reaction temperature was kept at 90°C. After cooling overnight, the mixture was filtered and washed six times with anhydrous ethanol. Finally, it was dried under vacuum at 60°C for 24 hours to obtain the samarium-containing rare earth complex Sm(bapn)(hq)(phen)2.

[0053] 4) Take 0.20 g of dried Sm(bapn)(hq)(phen)2 into a 100 mL three-necked flask, add 12 mL of N,N-dimethylformamide (DMF), and after the complex is completely dissolved, add 2.20 mL of methyl methacrylate (MMA) and stir continuously until homogeneous. Heat to 70 °C under a nitrogen atmosphere under vacuum and stir continuously for 30 min. Add 0.025 mg of benzoyl peroxide dissolved in 2 mL of DMF dropwise using a syringe. Maintain the reaction for 10 h. After the reaction is complete, allow the system to cool to room temperature, and then slowly add the reactants dropwise to a methanol solution under vigorous stirring. A flocculent precipitate appears; filter, dry, dissolve in a small amount of DMF, and then dissolve again in methanol. Dry the filtered flocculent precipitate in a vacuum drying oven to obtain the final benzophenone-type samarium-containing polymeric complex light-converting agent Sm(bapn)(hq)(phen)2-co-MMA.

[0054] Example 3 A method for preparing a benzophenone-type samarium-containing polymeric complex light-converting agent includes the following steps: 1) Accurately weigh 0.7 g of Sm2O3 and dissolve it in 17 mL of concentrated hydrochloric acid. Heat the solution at 95 °C for 1.2 h to remove excess concentrated hydrochloric acid. Then dilute the solution with 20 mL of anhydrous ethanol to obtain a samarium ion solution, i.e., SmCl3 solution.

[0055] 2) Accurately weigh 0.17 g of 8-hydroxyquinoline (hq), 0.27 g of 2-hydroxy-4-propenoxybenzophenone (bapn) and 0.26 g of o-phenanthroline (phen) and dissolve them in 18 mL of anhydrous ethanol. Stir to ensure complete dissolution and prepare solution 1, solution 2 and solution 3.

[0056] 3) The prepared samarium ion solution was placed in a 250 mL three-necked flask. The temperature was raised to 95°C using an oil bath, and solution 1 was slowly added dropwise. After 1 hour of reaction, the pH was maintained at 6.5. Solution 2 was then slowly added to the mixture, and the reaction was continued for 1 hour. Finally, solution 3 was slowly added, and the reaction was stirred continuously for 1.3 hours after all additions were completed. After each addition, the pH was adjusted using 10% NaOH solution to maintain a pH of 7.5, and the reaction temperature was kept at 95°C. After cooling overnight, the mixture was filtered and washed five times with anhydrous ethanol. Finally, it was dried under vacuum at 60°C for 24 hours to obtain the samarium-containing rare earth complex Sm(bapn)(hq)(phen)2.

[0057] 4) Take 0.32 g of dried Sm(bapn)(hq)(phen)2 into a 100 mL three-necked flask, add 10 mL of N,N-dimethylformamide (DMF), and after the complex is completely dissolved, add 3.05 mL of ethyl acrylate (EA) and stir continuously until homogeneous. Heat to 70 °C under a nitrogen atmosphere under vacuum and stir continuously for 30 min. Add 0.028 mg of benzoyl peroxide dissolved in 4 mL of DMF using a syringe. Maintain the reaction for 11 h. After the reaction is complete, allow the system to cool to room temperature, and then slowly add the reactants dropwise to a methanol solution under vigorous stirring. A flocculent precipitate appears; filter, dry, dissolve in a small amount of DMF, and then dissolve again in methanol. Dry the filtered flocculent precipitate in a vacuum drying oven to obtain the final benzophenone-type samarium-containing polymeric complex light-converting agent Sm(bapn)(hq)(phen)2-co-EA.

[0058] Example 4 A method for preparing an 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent includes the following steps: 1) Accurately weigh 0.60 g of Sm2O3 and dissolve it in 20 mL of concentrated hydrochloric acid. Heat the solution at 100℃ for 2 hours to remove excess concentrated hydrochloric acid. Then dilute the solution with 20 mL of anhydrous ethanol to obtain a samarium ion solution, i.e., SmCl3 solution.

[0059] 2) Accurately weigh 0.20 g of 8-hydroxyquinoline (hq), 0.30 g of 2-hydroxy-4-propenoxybenzophenone (bapn) and 0.30 g of o-phenanthroline (phen) and dissolve them in 20 mL of anhydrous ethanol. Stir to ensure complete dissolution and prepare solution 1, solution 2 and solution 3.

[0060] 3) The prepared samarium ion solution was placed in a 250 mL three-necked flask. The temperature was raised to 100°C using an oil bath, and solution 1 was slowly added dropwise. After 1 hour of reaction, the pH was maintained at 6. Solution 2 was then slowly added to the mixed solution, and the reaction was continued for 1 hour. Finally, solution 3 was slowly added, and the reaction was stirred continuously for 1.5 hours after all additions were completed. After each addition, the pH was adjusted using 10% NaOH solution to maintain a pH of 8, and the reaction temperature was kept at 100°C. After cooling overnight, the mixture was filtered and washed six times with anhydrous ethanol. Finally, it was dried under vacuum at 60°C for 24 hours to obtain the samarium-containing rare earth complex Sm(bapn)(hq)(phen)2.

[0061] 4) Take 0.40 g of dried Sm(bapn)(hq)(phen)2 into a 100 mL three-necked flask, add 15 mL of N,N-dimethylformamide (DMF), and after the complex is completely dissolved, add 4.0 mL of ethyl 2-methacrylate (EMA), and stir continuously until homogeneous. Heat to 65 °C under a nitrogen atmosphere under vacuum, and stir continuously for 30 min. Add 0.03 mg of benzoyl peroxide dissolved in 5 mL of DMF dropwise using a syringe. Maintain the reaction for 12 h. After the reaction is complete, allow the system to cool to room temperature, and then slowly add the reactants dropwise to a methanol solution under vigorous stirring. A flocculent precipitate appears; filter, dry, dissolve in a small amount of DMF, and then dissolve again in methanol. Dry the filtered flocculent precipitate in a vacuum drying oven to obtain the final benzophenone-type samarium-containing polymeric complex, Sm(bapn)(hq)(phen)2-co-EMA.

[0062] Example 5 A method for preparing an 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent includes the following steps: 1) Accurately weigh 0.30 g of Sm2O3 and dissolve it in 10 mL of concentrated hydrochloric acid. Heat the solution at 90℃ for 1 h to remove excess concentrated hydrochloric acid. Then dilute the solution with 20 mL of anhydrous ethanol to obtain a samarium ion solution, i.e., SmCl3 solution.

[0063] 2) Accurately weigh 0.10g of 8-hydroxyquinoline (hq), 0.20g of 2-hydroxy-4-propenoxybenzophenone (bapn) and 0.20g of o-phenanthroline (phen) and dissolve them in 10mL of anhydrous ethanol, stirring to ensure complete dissolution, to prepare solution 1, solution 2 and solution 3.

[0064] 3) The prepared samarium ion solution was placed in a 250 mL three-necked flask. The temperature was raised to 80°C using an oil bath, and solution 1 was slowly added dropwise. After 1 hour of reaction, the pH was maintained at 6. Solution 2 was then slowly added to the mixture, and the reaction was continued for 1 hour. Finally, solution 3 was slowly added, and the reaction was stirred continuously for 1 hour after all additions were completed. After each addition, the pH was adjusted using 10% NaOH solution to maintain a pH of 7, and the reaction temperature was kept at 80°C. After cooling overnight, the mixture was filtered and washed five times with anhydrous ethanol. Finally, it was vacuum dried at 60°C for 24 hours to obtain the samarium-containing rare earth complex Sm(bapn)(hq)(phen)2.

[0065] 4) Take 0.10 g of dried Sm(bapn)(hq)(phen)2 into a 100 mL three-necked flask, add 10 mL of N,N-dimethylformamide (DMF), and after the complex is completely dissolved, add 1.0 mL of methyl acrylate (MA) and stir continuously until homogeneous. Heat to 60 °C under a nitrogen atmosphere and stir continuously for 30 min. Add 0.02 mg of benzoyl peroxide dissolved in 1 mL of DMF dropwise using a syringe. Maintain the reaction for 8 h. After the reaction is complete, allow the system to cool to room temperature, and then slowly add the reactants dropwise to a methanol solution under vigorous stirring. A flocculent precipitate appears; filter, dry, dissolve in a small amount of DMF, and then dissolve again in methanol. Dry the filtered flocculent precipitate in a vacuum drying oven to obtain the final benzophenone-type samarium-containing polymeric complex light-converting agent Sm(bapn)(hq)(phen)2-co-MA.

[0066] Example 6 A method for preparing an 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent includes the following steps: 1) Accurately weigh 0.70 g of Sm2O3 and dissolve it in 20 mL of concentrated hydrochloric acid. Heat the solution at 100℃ for 2 hours to remove excess concentrated hydrochloric acid. Then dilute the solution with 20 mL of anhydrous ethanol to obtain a samarium ion solution, i.e., SmCl3 solution.

[0067] 2) Accurately weigh 0.20g of 8-hydroxyquinoline (hq), 0.30g of 2-hydroxy-4-propenoxybenzophenone (bapn) and 0.30g of o-phenanthroline (phen) and dissolve them in 20mL of anhydrous ethanol. Stir to ensure complete dissolution and prepare solution 1, solution 2 and solution 3.

[0068] 3) The prepared samarium ion solution was placed in a 250 mL three-necked flask. The temperature was raised to 100 °C using an oil bath, and solution 1 was slowly added dropwise. After the addition was complete, the reaction was allowed to proceed for 1.5 h, maintaining a pH of 7. Solution 2 was then slowly added to the mixture, and the reaction was allowed to continue for 1.5 h. Finally, solution 3 was slowly added, and the reaction was stirred continuously for 1.5 h after all additions were completed. After each addition, the pH of the system was adjusted using 10% NaOH solution to maintain a pH of 8, and the reaction temperature was kept at 100 °C. After the reaction was complete and cooled overnight, the mixture was filtered and washed six times with anhydrous ethanol. Finally, it was vacuum dried at 60 °C for 24 h to obtain the samarium-containing rare earth complex Sm(bapn)(hq)(phen)2.

[0069] 4) Take 0.40 g of dried Sm(bapn)(hq)(phen)2 into a 100 mL three-necked flask, add 15 mL of N,N-dimethylformamide (DMF), and after the complex is completely dissolved, add 4 mL of ethyl 2-methacrylate (EMA), and stir continuously until homogeneous. Heat to 70 °C under a nitrogen atmosphere under vacuum, and stir continuously for 30 min. Add 0.03 mg of benzoyl peroxide dissolved in 5 mL of DMF using a syringe. Maintain the reaction for 12 h. After the reaction is complete, allow the system to cool to room temperature, and then slowly add the reactants dropwise to a methanol solution under vigorous stirring. A flocculent precipitate appears; filter, dry, dissolve in a small amount of DMF, and then dissolve again in methanol. Dry the filtered flocculent precipitate in a vacuum drying oven to obtain the final benzophenone-type samarium-containing polymeric complex optical converter Sm(bapn)(hq)(phen)2-co-MA.

[0070] Example 7 A method for preparing an 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent includes the following steps: 1) Accurately weigh 0.6 g of Sm2O3 and dissolve it in 15 mL of concentrated hydrochloric acid. Heat the solution at 95℃ for 1.5 h to remove excess concentrated hydrochloric acid. Then dilute the solution with 20 mL of anhydrous ethanol to obtain a samarium ion solution, i.e., SmCl3 solution.

[0071] 2) Accurately weigh 0.15g of 8-hydroxyquinoline (hq), 0.25g of 2-hydroxy-4-propenoxybenzophenone (bapn) and 0.25g of o-phenanthroline (phen) and dissolve them in 15mL of anhydrous ethanol. Stir to ensure complete dissolution and prepare solution 1, solution 2 and solution 3.

[0072] 3) The prepared samarium ion solution was placed in a 250 mL three-necked flask. The temperature was raised to 90°C using an oil bath, and solution 1 was slowly added dropwise. After the addition was complete, the reaction was allowed to proceed for 1.2 h, maintaining the pH at 6.5. Solution 2 was then slowly added to the mixture, and the reaction was allowed to continue for 1.2 h. Finally, solution 3 was slowly added, and the reaction was stirred continuously for 1.2 h after all additions were completed. After each addition, the pH was adjusted using 10% NaOH solution to maintain the pH at 7.5, and the reaction temperature was kept at 90°C. After the reaction was complete and cooled overnight, the mixture was filtered and washed five times with anhydrous ethanol. Finally, it was vacuum dried at 60°C for 24 h to obtain the samarium-containing rare earth complex Sm(bapn)(hq)(phen)2.

[0073] 4) Take 0.25 g of dried Sm(bapn)(hq)(phen)2 into a 100 mL three-necked flask, add 12 mL of N,N-dimethylformamide (DMF), and after the complex is completely dissolved, add 3.0 mL of methyl acrylate (MA) and stir continuously until homogeneous. Heat to 65 °C under a nitrogen atmosphere under vacuum and stir continuously for 30 min. Add 0.025 mg of benzoyl peroxide dissolved in 3 mL of DMF dropwise using a syringe. Maintain the reaction for 10 h. After the reaction is complete, allow the system to cool to room temperature, and then slowly add the reactants dropwise to a methanol solution under vigorous stirring. A flocculent precipitate appears; filter, dry, dissolve in a small amount of DMF, and then dissolve again in methanol. Dry the filtered flocculent precipitate in a vacuum drying oven to obtain the final benzophenone-type samarium-containing polymeric complex, Sm(bapn)(hq)(phen)2-co-MA.

[0074] In summary, the 8-hydroxyquinoline / benzophenone-type samarium-containing polymeric light-converting agent prepared in this invention has the general molecular formula: Sm(bapn)(hq)(phen)2-co-A. This light-converting agent efficiently converts ultraviolet light into red-orange light more suitable for plant growth, improving light energy utilization efficiency and allowing more solar energy to be used by plants for photosynthesis. Because the generated 641 nm characteristic light has a high degree of agreement with the absorption peak of plant chlorophyll, it greatly enhances the photosynthetic efficiency of plants, helping them to better perform photosynthesis. This light-converting agent can be used as an agricultural film material to improve the photosynthetic efficiency of crops by optimizing light conditions, ultimately achieving increased yield and quality. It not only helps improve crop productivity but also enhances the quality of agricultural products, which is of great significance to the development of modern agriculture.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A samarium-containing polymeric complex light-converting agent of the 8-hydroxyquinoline / benzophenone type, characterized in that, The general molecular formula of the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent is: Sm(bapn)(hq)(phen)2-co-A; In the formula, Sm is Sm 3+ Central coordinating ion; bapn is 2-hydroxy-4-propenoxybenzophenone; hq is 8-hydroxyquinoline; phen is o-phenanthroline; A is an acrylate compound; The bapn, hq, and phen are ligands.

2. The 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent according to claim 1, characterized in that, The acrylate compound is any one of methyl acrylate, methyl methacrylate, ethyl acrylate, and ethyl 2-methacrylate.

3. The method for preparing the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent according to any one of claims 1 or 2, characterized in that, include: 1) Add 8-hydroxyquinoline solution to samarium ion solution and adjust the pH to 6-7. After heating and stirring, add 2-hydroxy-4-propenoxybenzophenone solution and adjust the pH to 7-8. After heating and stirring, add o-phenanthroline solution and heat and stir. After filtration, washing and vacuum drying, samarium-containing rare earth complex is obtained. 2) The samarium-containing rare earth complex was dissolved in N,N-dimethylformamide, and then acrylate compounds and initiators were added. The mixture was heated and stirred under an inert atmosphere, then cooled to room temperature. Methanol was added dropwise under vigorous stirring to obtain a flocculent precipitate. After filtration, the precipitate was dissolved in N,N-dimethylformamide and then methanol was added dropwise to form a viscous polymer compound. After filtration, washing, and drying, an 8-hydroxyquinoline / benzophenone type samarium-containing polymer complex light-converting agent was obtained.

4. The method for preparing the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent according to claim 3, characterized in that, The samarium ion solution is prepared by dissolving samarium chloride in ethanol; the ratio of samarium chloride, 8-hydroxyquinoline, 2-hydroxy-4-propenoxybenzophenone, o-phenanthroline, samarium-containing rare earth complex, N,N-dimethylformamide, acrylate compound and initiator is (0.30-0.70) g : (0.10-0.20) g : (0.20-0.30) g : (0.20-0.30) g : (0.10-0.40) g : (10-15) mL : (1-4) mL : (0.02-0.03) mg.

5. The method for preparing the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent according to claim 4, characterized in that, The 2-hydroxy-4-propenoxybenzophenone, 8-hydroxyquinoline, o-phenanthroline and samarium ion solution contain Sm 3+ The molar ratio is 1:1:2:

1.

6. The method for preparing the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent according to claim 3, characterized in that, In step 1), the samarium ion solution is prepared by dissolving 0.3-0.7g of Sm2O3 in 10-20mL of concentrated hydrochloric acid, heating until the concentrated hydrochloric acid is completely evaporated, and then dissolving the samarium chloride powder in anhydrous ethanol; the heating temperature is 90-100℃ and the heating time is 1-2h. The 8-hydroxyquinoline solution was prepared by dissolving 8-hydroxyquinoline in ethanol; The 2-hydroxy-4-propenoxybenzophenone solution was prepared by dissolving 2-hydroxy-4-propenoxybenzophenone in ethanol; The o-phenanthroline solution was prepared by dissolving o-phenanthroline in ethanol.

7. The method for preparing the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent according to claim 3, characterized in that, In step 1), an acid-binding agent is added to maintain the pH value within a preset range during the reaction process. The acid-binding agent is sodium hydroxide or diisopropylethylamine.

8. The method for preparing the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent according to claim 3, characterized in that, In step 1), the temperature of the heating and stirring reaction is 80-100℃, and the heating and stirring reaction time is 1-1.5h.

9. The method for preparing the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent according to claim 3, characterized in that, In step 2), the initiator is benzoyl peroxide; the inert atmosphere is nitrogen; the temperature of the heating and stirring reaction is 60-70℃, and the heating and stirring reaction time is 8-12h.

10. The application of the 8-hydroxyquinoline / benzophenone type samarium-containing polymeric complex light-converting agent according to any one of claims 1 or 2 in the preparation of agricultural film materials.

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