Light conversion agent and preparation method thereof, light conversion adhesive film, and photovoltaic module

Abstract

The present invention belongs to the technical field of light conversion agents for photovoltaic films, and specifically relates to light conversion agents and preparation methods thereof, light conversion films, and photovoltaic modules. Based on existing triazole light conversion agents, the present light conversion agent and preparation method thereof, light conversion films, and photovoltaic modules overcome the defect of N-substituted triazole light conversion agents that are not resistant to migration. By introducing silane / siloxane, the light conversion agent can interact with a matrix resin to form an interpenetrating network structure, forming a stable "bonding bridge" between molecules of the network polysiloxane structure, combining the light conversion agent and the matrix resin in the form of chemical bonds, reducing the free small molecules of the light conversion agent, and effectively improving the migration of the light conversion agent.

Description

Technical Field

[0001] The present invention belongs to the technical field of light conversion agents for photovoltaic films, and in particular relates to a light conversion agent and a preparation method thereof, a light conversion film, and a photovoltaic module. Background Art

[0002] Because solar cell encapsulation materials are polymers, high-energy radiation such as ultraviolet rays in the atmosphere can damage the carbon chains of these materials. Therefore, to mitigate the degradation and aging effects of ultraviolet light in sunlight on EVA films, light stabilizers and UV absorbers are often added. Light stabilizers in EVA films shield or absorb the energy of ultraviolet light, quenching singlet oxygen and decomposing hydroperoxides into inactive substances, thereby reducing or delaying the aging of the EVA resin. UV absorbers selectively absorb high-energy ultraviolet light and convert the absorbed energy into heat or harmless low-energy radiation, thereby dissipating it. This prevents chemical reactions that can cause aging and degradation of the EVA resin due to the absorption of ultraviolet light.

[0003] To better utilize solar energy, light converters are typically used to convert ultraviolet light that solar cells cannot absorb into visible light. However, existing organic light converters are prone to migration within the film due to their small molecular polarity. Furthermore, N-substituted triazole light converters have few coupling active sites, making it difficult to modify their migration resistance.

[0004] Therefore, how to overcome the shortcomings of the existing mainstream N-modified triazole light-converting agents and the difficulty in migration resistance modification is a technical problem that urgently needs to be solved in this field.

[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the Invention

[0006] The embodiments of the present disclosure at least provide a light conversion agent and a preparation method thereof, and a light conversion adhesive film.

[0007] In a first aspect, the present disclosure provides a light conversion agent, the general structural formula of which is as follows:

[0008] Where R0 is -(CH2) n -Si(R a )3; R a It is any one of an alkyl group and an alkoxy group having one to six carbon atoms; and n is an integer of 0 to 5.

[0009] In an optional embodiment, the R aThe alkyl group includes any one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl and n-hexyl.

[0010] In an optional embodiment, the structural formula of the light conversion agent is:

[0011]

[0012] In an optional embodiment, the structural formula of the light conversion agent is:

[0013]

[0014] In an optional embodiment, the R a The alkoxy group includes any one of methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy and acetoxy.

[0015] In an optional embodiment, the structural formula of the light conversion agent is:

[0016]

[0017] In an optional embodiment, R0 on both sides of the light conversion agent is an asymmetric structure.

[0018] In an optional embodiment, the structural formula of the light conversion agent is:

[0019]

[0020] In a second aspect, the present disclosure also provides a method for preparing the light conversion agent as described above, comprising the following steps: step S1, reacting benzotriazole with isobutyl iodide, and separating the reaction mixture through a column to obtain 1-isobutylbenzotriazole and 2-isobutylbenzotriazole; step S21, reacting 2-isobutylbenzotriazole with sufficient liquid bromine to obtain 2-isobutyl-4,7-dibromobenzotriazole; step S22, reacting 2-isobutylbenzotriazole with about 1.1 parts by mole of liquid bromine to obtain 2-isobutyl-4-bromobenzotriazole; step S3 1. 2-isobutyl-4,7-dibromobenzotriazole and a phenylboronic acid compound having an R0 group are synthesized to obtain a light conversion agent with a symmetrical structure; step S32, 2-isobutyl-4-bromobenzotriazole and a phenylboronic acid compound having an R0 group are synthesized to obtain an intermediate; step S42, the intermediate is reacted with approximately 1.1 parts by mole of liquid bromine, and then synthesized with a phenylboronic acid compound having an R0 group to obtain an asymmetric light conversion agent; wherein the structures of the R0 groups carried by the phenylboronic acid compounds having the R0 group in step S32 and step S42 are different.

[0021] In a third aspect, the embodiments of the present disclosure also provide a light-converting adhesive film, comprising the following components in parts by mass: 90-100 parts of a base resin, 0.2-1.5 parts of a cross-linking agent, 0.1-3 parts of a co-cross-linking agent, 0.1-1 parts of a light stabilizer, 0.01-0.3 parts of an antioxidant, 0.2-1 parts of a coupling agent, and 0.1-1 parts of the light-converting agent described above.

[0022] In a fourth aspect, an embodiment of the present disclosure further provides a photovoltaic module comprising the light-converting adhesive film as described above.

[0023] The beneficial effects of the present invention are that, based on the existing triazole light conversion agents, the present light conversion agent and its preparation method, the light conversion adhesive film, and the photovoltaic module overcome the defect of N-substituted triazole light conversion agents that are not resistant to migration. By introducing silane / siloxane, they can interact with the matrix resin to form an interpenetrating network structure, forming a stable network polysiloxane structure between molecular "bonding bridges", combining the light conversion agent and the matrix resin in the form of chemical bonds, reducing the free small molecules of the light conversion agent, and effectively improving the migration of the light conversion agent.

[0024] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a H NMR spectrum of the light conversion agent of Example 1 provided in the embodiments of the present disclosure;

[0028] Figure 2 This is a H NMR spectrum of the light conversion agent of Example 2 provided in the embodiments of the present disclosure;

[0029] Figure 3 This is the H NMR spectrum of the light conversion agent of Example 3 provided in the embodiments of the present disclosure.

[0030] Figure 4 This is the H NMR spectrum of the light conversion agent of Example 4 provided in the embodiments of the present disclosure. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described 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.

[0032] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0033] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." when following a list of elements modify the entire list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0034] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an" and "the" may also be intended to include plural forms, unless otherwise clearly indicated herein. The terms "comprise", "include" and "have" are inclusive and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the particular order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0035] Removing N-modified triazoles is not conducive to migration resistance modification. Due to the resonance effect of triazole itself, the N substitution probability of different positions of N-substituted triazole light conversion agents is consistent, and the yield is greatly affected. For the light conversion rate of triazole modification, product yield is also one of the important determining factors.

[0036] The defects in the above solutions are the results obtained by the inventors after practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed by this disclosure for the above problems below should be the contributions made by the inventors to this disclosure during the disclosure process.

[0037] The present disclosure provides a light conversion agent, the general structural formula of which is as follows:

[0038] Where R0 is -(CH2) n -Si(R a )3; R a It is any one of an alkyl group and an alkoxy group having one to six carbon atoms; and n is an integer of 0 to 5.

[0039] In some embodiments, specifically, R a The alkyl group includes any one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl and n-hexyl.

[0040] In some embodiments, specifically, the light conversion agent has the structural formula:

[0041]

[0042] In some embodiments, specifically, the light conversion agent has the structural formula:

[0043]

[0044] In some embodiments, specifically, R a The alkoxy group includes any one of methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy and acetoxy.

[0045] In some embodiments, specifically, the light conversion agent has the structural formula:

[0046]

[0047] In some embodiments, specifically, R0 on both sides of the light conversion agent is an asymmetric structure. The asymmetric structure here is compared with the symmetric structure of R0 on both sides in some of the aforementioned embodiments, and does not mean that R0 on one side itself is a symmetric or asymmetric structure.

[0048] In some embodiments, specifically, the light conversion agent has the structural formula:

[0049]

[0050] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0051] The synthesis of 2-isobutylbenzotriazole, the chemical formula is as follows:

[0052]

[0053] Benzotriazole (6.078 g, 50.000 mmol, w = 98%), isobutane iodide (11.382 g, 60 mmol, w = 97%), and potassium carbonate (20.732 g, 150.000 mmol, w = 99%) were added to a round-bottom flask and dissolved in DMF (100 mL). The mixture was heated under reflux at 80°C for 5 h until the starting material disappeared (do not stir at room temperature, as benzotriazole will easily convert to HOBt and become ineffective). After completion of the reaction, the DMF was washed away with saturated ammonium chloride solution, and the mixture was extracted five times with ethyl acetate, dried with sodium sulfate, and the solvent was evaporated. 1-isobutylbenzotriazole (4.105 g, 47% yield) and 2-isobutylbenzotriazole (4.100 g, 47% yield) were separated by column chromatography using silica gel as the stationary phase and an organic solvent (DCM:PE = 1:4).

[0054] The synthesis of 2-isobutyl-4,7-dibromobenzotriazole, the chemical formula is as follows:

[0055]

[0056] 2-Isobutylbenzotriazole (4.100 g, 23.398 mmol), hydrobromic acid (28.468 g, 168.887 mmol, w=48%), and liquid bromine (11.217 g, 70.194 mmol) were added sequentially to a round-bottom flask and refluxed at 130°C for 24 h. The hydrobromic acid and liquid bromine were washed out with ice-cold potassium hydroxide. The product was extracted five times with DCM, dried over anhydrous sodium sulfate, and the solvent was evaporated. Column separation yielded 2-isobutyl-4,7-dibromobenzotriazole (7.170 g, 92% yield).

[0057] Example 1 Synthesis of light conversion agent, the chemical formula is as follows:

[0058]

[0059] 2-isobutyl-4,7-dibromobenzotriazole (0.468 g, 1.406 mmol), 4-(trimethylsilyl)phenylboronic acid (0.767 g, 3.937 mmol, w=98%), potassium carbonate (0.585 g, 4.218 mmol, w=99%), and tetrakistriphenylphosphine palladium (0.163 g, 0.141 mmol) were added to a reaction vessel. The air was evacuated and nitrogen was introduced. 2-isobutyl-4,7-dibromobenzotriazole was dissolved in 1,4-dioxane (5 mL) and injected into the reactor via syringe. Water (1 mL) was also injected into the reactor via syringe. The mixture was refluxed at 100°C in a sealed reactor for 12 h until the 2-isobutyl-4,7-dibromobenzotriazole reacted completely. After the reaction is completed, the reaction solution is poured into a beaker, and water is absorbed with anhydrous sodium sulfate and filtered, and the solvent is dried by spin drying. Silica gel is used as the stationary phase, and an organic solvent (DCM:PE=1:10) is used as the mobile phase. The product is separated by column and recrystallized to obtain the following: Figure 1 The H NMR spectrum of the light-converting agent of Example 1 (0.230 g, isolated yield: 35%) is shown.

[0060] Example 2 Synthesis of light conversion agent, the chemical formula is as follows:

[0061]

[0062] 2-isobutyl-4,7-dibromobenzotriazole (0.468 g, 1.406 mmol), 4-(trimethoxysilyl)phenylboronic acid (1.133 g, 3.937 mmol, w = 98%), potassium carbonate (0.586 g, 4.230 mmol, w = 99%), and tetrakistriphenylphosphine palladium (0.163 g, 0.141 mmol) were added to a reaction vessel. The air was evacuated and nitrogen was introduced. 2-isobutyl-4,7-dibromobenzotriazole was dissolved in 1,4-dioxane (5 mL) and injected into the reactor via syringe. Water (1 mL) was also injected into the reactor via syringe. In a sealed reactor, reflux at 100°C for 12 h until the 2-isobutyl-4,7-dibromobenzotriazole reacted completely. After the reaction is completed, the reaction solution is poured into a beaker, and water is absorbed with anhydrous sodium sulfate and filtered, and the solvent is dried by spin drying. Silica gel is used as the stationary phase, and an organic solvent (DCM:PE=1:10) is used as the mobile phase. The product is separated by column and recrystallized to obtain the following: Figure 2 The H NMR spectrum of the light-converting agent of Example 2 (0.245 g, isolated yield: 38%) is shown.

[0063] Example 3 Synthesis of light conversion agent, the chemical formula is as follows:

[0064]

[0065] 2-Isobutyl-4,7-dibromobenzotriazole (0.468 g, 1.420 mmol), 4-(tert-butyldimethylsilyloxy)phenylboronic acid (1.002 g, 3.976 mmol, w = 98%), potassium carbonate (0.589 g, 4.260 mmol, w = 99%), and tetrakistriphenylphosphine palladium (0.164 g, 0.142 mmol) were added to a reaction vessel. The air was evacuated and nitrogen was introduced. 2-Isobutyl-4,7-dibromobenzotriazole was dissolved in 1,4-dioxane (5 mL) and injected into the reactor via syringe. Water (1 mL) was also injected into the reactor via syringe. The mixture was refluxed at 100°C in a sealed reactor for 12 h until the 2-Isobutyl-4,7-dibromobenzotriazole reacted completely. After the reaction is completed, the reaction solution is poured into a beaker, and water is absorbed with anhydrous sodium sulfate and filtered, and the solvent is dried by spin drying. Silica gel is used as the stationary phase, and an organic solvent (DCM:PE=1:5) is used as the mobile phase. The column is separated to obtain Figure 3 The H NMR spectrum of the light converter of Example 3 (0.542 g, isolated yield: 65%) is shown.

[0066] The synthesis of 2-isobutyl-4-bromobenzotriazole, the chemical formula is as follows:

[0067]

[0068] 2-Isobutylbenzotriazole (3.088 g, 17.623 mmol), hydrobromic acid (10.292 g, 127.208 mmol, w=48%), and liquid bromine (3.098 g, 19.385 mmol) were added sequentially to a round-bottom flask and refluxed at 100°C for 24 h. The hydrobromic acid and liquid bromine in the reaction were washed out with glacial potassium hydroxide solution. The product was extracted five times with DCM, dried over anhydrous sodium sulfate, and the solvent was evaporated. Column separation yielded 2-isobutyl-4-bromobenzotriazole (2.463 g, 55% yield).

[0069] The synthesis of 2-isobutyl-4-(4-tert-butylphenyl)benzotriazole has the following chemical formula:

[0070]

[0071] Take 2-isobutyl-4-bromobenzotriazole (0.985g, 3.880mmol), 4-tert-butylphenylboronic acid (1.057g, 5.820mmol, w=98%), potassium carbonate (1.608g, 11.640mmol, w=99%), and tetrakistriphenylphosphine palladium (0.448g, 0.388mmol). First, add all the solids to a reaction vessel, evacuate the air, fill with nitrogen, dissolve 2-isobutyl-4-bromobenzotriazole in 1,4-dioxane (5mL), and inject it into the reactor using a syringe. In addition, water (1mL) needs to be injected into the reactor using a syringe. Reflux at 100°C for 12h until the 2-isobutyl-4-bromobenzotriazole reacts completely. After the reaction is complete, pour the reaction solution into a beaker, absorb water with anhydrous sodium sulfate, filter, and spin dry the solvent. Silica gel was used as the stationary phase and an organic solvent (DCM:PE=1:10) was used as the mobile phase to separate 2-isobutyl-4-(4-tert-butylphenyl)benzotriazole (0.891 g, isolated yield: 74%).

[0072] The synthesis of 2-isobutyl-4-(4-tert-butylphenyl)-7-bromobenzotriazole has the following chemical formula:

[0073]

[0074] 2-Isobutyl-4-(4-tert-butylphenyl)benzotriazole (0.315 g, 1.024 mmol), hydrobromic acid (1.246 g, 7.392 mmol, w=48%), and liquid bromine (0.160 g, 1.000 mmol) were added sequentially to a round-bottom flask and refluxed at 100°C for 18 h. The hydrobromic acid and liquid bromine in the reaction were washed out with glacial potassium hydroxide solution, extracted five times with DCM, dried over anhydrous sodium sulfate, and the solvent was spin-dried. Column separation yielded 2-isobutyl-4-(4-tert-butylphenyl)-7-bromobenzotriazole (0.245 g, isolated yield: 63%).

[0075] Example 4 Synthesis of light conversion agent, the chemical formula is as follows:

[0076]

[0077] Take 2-isobutyl-4-(4-tert-butylphenyl)-7-bromobenzotriazole (0.270g, 0.700mmol), 4-(trimethylsilyl)phenylboronic acid (0.208g, 1.050mmol, w=98%), potassium carbonate (0.290g, 2.100mmol, w=99%), and tetrakistriphenylphosphine palladium (0.081g, 0.070mmol). First, add all the solids to a reaction vessel, evacuate the air, fill with nitrogen, use a syringe to extract 1,4-dioxane (5mL) and water (1mL) and inject them into a sealed reactor, reflux at 100℃ for 12h until the reaction of 2-isobutyl-4-(4-tert-butylphenyl)-7-bromobenzotriazole is complete. After the reaction is complete, pour the reaction solution into a beaker, absorb water with anhydrous sodium sulfate, filter, and spin-dry the solvent. Silica gel was used as the stationary phase and organic solvent (EA:PE=1:20) was used as the mobile phase. The separation was carried out through the column to obtain the following Figure 4 The H NMR spectrum of the light-converting agent of Example 4 (0.281 g, isolated yield: 88%) is shown.

[0078] In some embodiments, specifically, 100 parts of EVA resin (DuPont 53071), 0.5 parts of cross-linking agent (tert-butyl peroxide 2-ethylhexyl carbonate), 0.5 parts of co-cross-linking agent (triallyl isocyanurate), 0.2 parts of light stabilizer (light stabilizer 770), 0.1 parts of antioxidant (hindered phenol antioxidant 1010), 0.3 parts of coupling agent (silane coupling agent KH-570), and several parts of light-converting agent are blended together by mass, granulated at 160-220° C. to obtain grafted EVA resin, and cast co-extruded to obtain light-converting film. The specific mass proportion of the light-converting agent is shown in Table 1 below.

[0079] Table 1

[0080] Example Add Scale Comparative Example 1 0.15 parts of benzotriazole Comparative Example 2 0.15 parts of N-modified benzotriazole Example 1 0.15 parts of the light conversion agent of Example 1 Example 2 0.15 parts of the light conversion agent of Example 2 Example 3 0.15 parts of the light conversion agent of Example 3 Example 4 0.15 parts of the light-converting agent of Example 4

[0081] The performance of the light-converting adhesive film prepared in the embodiment was further measured, and the test performance was as follows:

[0082] A 30*30cm film sample was laminated with a solar cell to form a single sheet. After baking at 105°C for 48h, 120h, 192h, and 264h, the migration distance (unit / cm) of the light conversion agent from the front to the back was evaluated. The specific migration distances are shown in Table 2 below.

[0083] Table 2

[0084]

[0085]

[0086] In summary, the present light-converting agent, its preparation method, light-converting adhesive film, and photovoltaic module overcome the defect of N-substituted triazole light-converting agents that are not resistant to migration on the basis of existing triazole light-converting agents. By introducing silane / siloxane, it can interact with the matrix resin to form an interpenetrating network structure, forming a stable network polysiloxane structure between molecular "bonding bridges", combining the light-converting agent and the matrix resin in the form of chemical bonds, reducing the free small molecules of the light-converting agent, and effectively improving the migration of the light-converting agent.

[0087] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A light conversion agent, characterized in that The general structural formula of the light conversion agent is as follows: ,in R0 is -(CH2) n -Si(R a )3; R a Any one of an alkyl group and an alkoxy group having one to six carbon atoms; n is an integer from 0 to 5.

2. The light conversion agent according to claim 1, wherein The R a The alkyl group includes any one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl and n-hexyl.

3. The light conversion agent according to claim 1, wherein The R a The alkoxy group includes any one of methoxy, ethoxy, propoxy, butoxy, pentyloxy and hexyloxy.

4. The light conversion agent according to claim 1, wherein The R0 on both sides of the light conversion agent is an asymmetric structure.

5. A light conversion agent, characterized in that The structural formula of the light conversion agent is: 。 6. A light conversion agent, characterized in that The structural formula of the light conversion agent is: 。 7. A light conversion agent, characterized in that The structural formula of the light conversion agent is: 。 8. A light conversion agent, characterized in that The structural formula of the light conversion agent is: 。 9. A method for preparing a light conversion agent according to any one of claims 5 to 8, characterized in that: The steps include: Step S1, reacting benzotriazole with isobutyl iodide, and separating by column to obtain 1-isobutylbenzotriazole and 2-isobutylbenzotriazole; Step S21, reacting 2-isobutylbenzotriazole with sufficient liquid bromine to obtain 2-isobutyl-4,7-dibromobenzotriazole; Step S22, reacting 2-isobutylbenzotriazole with 1.1 parts by mole of liquid bromine to obtain 2-isobutyl-4-bromobenzotriazole; Step S31, synthesizing 2-isobutyl-4,7-dibromobenzotriazole and a phenylboronic acid compound having an R0 group to obtain a light conversion agent with a symmetrical structure; Step S32, synthesizing 2-isobutyl-4-bromobenzotriazole and a phenylboronic acid compound having an R0 group to obtain an intermediate; Step S42, reacting the intermediate with 1.1 parts by mole of liquid bromine, and then synthesizing it with a phenylboronic acid compound having an R0 group to obtain an asymmetric light conversion agent; in The structures of the R0 groups carried by the phenylboronic acid compounds carrying the R0 groups in step S32 and step S42 are different.

10. A light-converting film, characterized in that: The composition includes the following parts by mass: 90-100 parts of base resin, 0.2-1.5 parts of crosslinking agent, 0.1-3 parts of auxiliary crosslinking agent, 0.1-1 parts of light stabilizer, 0.01-0.3 parts of antioxidant, 0.2-1 parts of coupling agent, and 0.1-1 parts of the light conversion agent according to any one of claims 1 to 8.

11. A photovoltaic module, characterized in that: The light-converting adhesive film comprises the light-converting adhesive film as claimed in claim 10.

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