Light conversion material, application thereof, light conversion adhesive film containing light conversion material, preparation method of light conversion adhesive film, solar cell module and method for enhancing efficiency and / or stability of solar cell

Abstract

The invention belongs to the field of solar cell materials, and provides a light conversion material, application thereof, a light conversion adhesive film containing the light conversion material, a preparation method of the light conversion adhesive film, a solar cell module and a method for enhancing efficiency and / or stability of a solar cell. The light conversion material is a compound shown as a formula I, and the definition of each group in the compound shown as the formula I is described in the specification. The light conversion adhesive film containing the light conversion material can be used for a solar cell to enhance the efficiency and / or stability of the cell.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of solar cell materials, and particularly relates to a light conversion material, application thereof, light conversion adhesive film containing the light conversion material and preparation method thereof, a solar cell module and a method for enhancing the efficiency and / or stability of a solar cell. BACKGROUND

[0002] Solar energy is abundant and clean and renewable, and is one of the most important fossil fuel replacement energy sources, which has attracted worldwide attention. Among various photovoltaic modules, intrinsic thin-film heterojunction (HJT) cells are considered to be one of the next generation mainstream technologies because of their high efficiency, simple process, and low temperature coefficient. However, the Si-H bonds in the amorphous silicon layer of HJT are prone to break under ultraviolet light irradiation, leading to material degradation and module aging, which is a major pain point in its industrialization. In response to this problem, the current solution in the industry is to introduce light conversion materials into the encapsulation adhesive film of the module. Such materials can absorb ultraviolet light, release a portion of the energy as heat, and release the remaining energy in the form of visible light or near-infrared light that can be effectively utilized by the cell, thus simultaneously improving the efficiency and lifespan of the cell. Currently, such light conversion adhesive films have been widely used in the encapsulation of HJT.

[0003] The light conversion materials in the prior art are usually organic fluorescent materials, rare earth materials, or quantum dot materials. For example, CN103339221, CN117431022, CN117247362, CN117327023, etc. use adhesive films containing triazole fluorescent materials; CN116997633, CN102268261, CN116970346, etc. use adhesive films containing materials containing rare earth metals such as Eu and Ce.

[0004] The principle of light conversion materials is not complex, but for a material to be industrialized, it should have multiple conditions such as strong absorption of ultraviolet light and blue-violet light at 300-420 nm, long emission wavelength, high photoluminescence quantum yield (PLQY), and high ultraviolet stability. It is a challenge to have all these features in one material. In the prior art, although fluorescent materials represented by triazoles have high PLQY, they have small Stokes shift and can only emit blue-violet light. Although inorganic rare earth materials have long emission wavelengths (500-700 nm), their emission peaks are narrow and their PLQY is low, making it difficult for them to efficiently convert ultraviolet light into visible light. Organic rare earth materials have high PLQY, but the organic ligands are prone to degradation under continuous ultraviolet light irradiation. Therefore, there is still a lack of efficient and stable light conversion materials. SUMMARY

[0005] The present application is directed to the above-mentioned problems existing in the prior art, and provides a light conversion material based on a phenopyrrole structure, an application thereof, a light conversion adhesive film containing the light conversion material and a preparation method thereof, a solar cell module, and a method for enhancing the efficiency and / or stability of a solar cell.

[0006] Specifically, one aspect of the present application provides a compound of Formula I:

[0007] In Formula I, i and j are each independently selected from an integer from 0 to 10;

[0008] R1, R2, R3, and R4 are each independently selected from a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group, and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group;

[0009] Ar is selected from a substituted or unsubstituted C6-C26 arylene group and a substituted or unsubstituted five- to twenty-six-membered heteroarylene group;

[0010] X1and X2are each independently selected from an oxygen atom, a sulfur atom, a selenium atom, and -NR-; wherein R is selected from a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group, and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group.

[0011] In one or more embodiments, in the compound of Formula I, the substituents on R1, R2, R3, R4, Ar, and R are each independently selected from one or more of halogen, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, C2-C10 ester, and C2-C10 amide.

[0012] In one or more embodiments, in the compound of Formula I, one or more of R1, R2, R3, R4, and R is a trifluoromethyl group.

[0013] In one or more embodiments, in the compound of Formula I, the substituents on R1, R2, R3, and R4 are each independently selected from one or more of halogen, C1-C10 alkyl, C1-C10 alkoxy, C2-C10 ester, and C2-C10 amide.

[0014] In one or more embodiments, in the compound of formula I, the substituents on Ar are selected from one or more of halogen, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, C2-C10 ester, and C2-C10 amide.

[0015] In one or more embodiments, in the compound of formula I, the substituents on R are selected from one or more of halogen, C1-C10 alkyl, C1-C10 alkoxy, C2-C10 ester, and C2-C10 amide.

[0016] In one or more embodiments, the compound of formula I is a compound of formula II:

[0017]

[0018] In formula II, i is an integer from 0 to 5;

[0019] R5 is a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group, and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group, and the substituents on R5 are preferably selected from one or more of halogen, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, C2-C10 ester, and C2-C10 amide; preferably, the halogen-substituted C1 alkyl group as R5 is a trifluoromethyl group;

[0020] X1 and X2 are each independently selected from an oxygen atom, a sulfur atom, a selenium atom, and -NR-; wherein R is selected from a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group, and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group, and the substituents on R are preferably selected from one or more of halogen, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, C2-C10 ester, and C2-C10 amide.

[0021] In one or more embodiments, in the compound of formula II, i is 2, R5 is a hydrogen atom, and X1 and X2 are each independently selected from an oxygen atom, a sulfur atom, a selenium atom, and -NR-; wherein R is selected from a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C10 aryl group, and a substituted or unsubstituted five- to ten-membered heteroaryl group, and the substituents on R are preferably one or more selected from a halogen, a C1-C10 alkyl group, a C1-C10 alkoxy group, a C2-C10 ester group, and a C2-C10 amide group.

[0022] In one or more embodiments, in the compound of formula II, i is 2, R5 is a hydrogen atom, and X1 and X2 are each independently selected from an oxygen atom and -NR-; wherein R is selected from a hydrogen atom, a substituted or unsubstituted C1-C6 alkyl group, and a substituted or unsubstituted C6-C10 aryl group, and the substituents on R are preferably one or more C1-C6.

[0023] In one or more embodiments, the compound of formula I is selected from the following compounds 1-5:

[0024]

[0025] Another aspect of the present application provides the use of the compound of formula I according to any one of the embodiments of the present application as a light conversion agent.

[0026] Another aspect of the present application provides a light conversion adhesive film comprising the compound of formula I according to any one of the embodiments of the present application, the light conversion adhesive film further comprising a substrate transparent to visible light

[0027] In one or more embodiments, the mass fraction of the compound of formula I in the light conversion adhesive film is 0.001% to 3%.

[0028] In one or more embodiments, the mass fraction of the compound of formula I in the light conversion adhesive film is 0.01% to 0.5%.

[0029] In one or more embodiments, the substrate is selected from one or more of polyethylene terephthalate, polyvinyl butyral, ethylene-vinyl acetate copolymer, polyethylene, ethylene polytetrafluoroethylene, polyimide, polycarbonate, polystyrene, polyurethane, polyacrylate, silicone sol, silicone gel, and polyolefin elastomer.

[0030] In one or more embodiments, the substrate has a refractive index of 1.4 to 1.7.

[0031] In one or more embodiments, the thickness of the light-converting adhesive film is 0.1 to 1.0 mm.

[0032] In one or more embodiments, the light-converting film further includes one or more additives selected from crosslinking agents, co-crosslinking agents, plasticizers, light stabilizers, antioxidants, and water-absorbing agents; preferably, the light-converting film includes crosslinking agents and co-crosslinking agents, and optionally one or more additives selected from plasticizers, light stabilizers, antioxidants, and water-absorbing agents.

[0033] Another aspect of the present invention provides a method for preparing the light-converting adhesive film according to any embodiment herein, the method comprising: mixing the components of the light-converting adhesive film evenly, melting and extruding them into a film, and cooling and shaping them to obtain the light-converting adhesive film.

[0034] Another aspect of the present invention provides a solar cell module comprising the light-converting adhesive film described in any embodiment herein.

[0035] In one or more embodiments, the solar cell module includes one or more of the following devices: PN junction devices containing group III-V or II-IV elements, Cu-In-Ga-Se thin film devices, organic sensitizer devices, organic thin film devices, quantum dot thin film devices, amorphous silicon solar cell devices, microcrystalline silicon solar cell devices, and crystalline silicon solar cell devices.

[0036] Another aspect of the present invention provides a method for enhancing the efficiency and / or stability of a solar cell, the method comprising: introducing a light-converting adhesive film as described in any embodiment herein into the solar cell.

[0037] In one or more embodiments, the solar cell includes one or more of the following devices: PN junction devices containing group III-V or II-IV elements, Cu-In-Ga-Se thin film devices, organic sensitizer devices, organic thin film devices, quantum dot thin film devices, amorphous silicon solar cell devices, microcrystalline silicon solar cell devices, and crystalline silicon solar cell devices.

[0038] This invention reveals that phenanthrene-pyrrole structures possess advantages such as strong ultraviolet absorption, high luminescence efficiency, and chemical stability, making them ideal building blocks for light-converting materials. Furthermore, they can undergo charge-transfer interactions with other groups, which helps to further broaden the absorption spectrum and redshift the emission of the material. This invention introduces phenanthrene-pyrrole structures, including phenanthreneimidazole and phenanthreneoxazole, into the molecules of light-converting materials, enabling the materials to possess both high efficiency and stability. Attached Figure Description

[0039] Figure 1 The absorption and fluorescence emission spectra of compounds 1-5 in this invention are shown.

[0040] Figure 2 Absorption spectra and fluorescence emission spectra of compound 1 and triazole material 6 in the present application. DETAILED DESCRIPTION

[0041] To enable persons skilled in the art to understand the features and effects of the present application, the following is a general description and definition of the terms and phrases mentioned in the present text. Unless otherwise specified, all technical and scientific words used in the text are of the usual meaning understood by those skilled in the art of the present application, and in the event of a conflict, the definition in the present specification shall prevail.

[0042] Theories or mechanisms described and disclosed in the present text, whether correct or not, should not in any way limit the scope of the present application, i.e. the present application can be practiced without being limited by any particular theory or mechanism.

[0043] In the present text, "comprising", "including", "containing", and similar phrases encompass the meaning of "consisting essentially of" and "consisting of", e.g. when the present text discloses "A comprising B and C", "A consisting essentially of B and C" and "A consisting of B and C" should be considered as having been disclosed in the present text.

[0044] In the present text, all features defined in the form of numerical ranges or percentage ranges such as values, amounts, contents and concentrations are for the sake of brevity and convenience. Accordingly, the description of numerical ranges or percentage ranges should be considered as having encompassed and specifically disclosed all possible sub-ranges and individual values within the range (including integers and fractions).

[0045] In the present text, unless otherwise specified, percentages refer to mass percentages and ratios refer to mass ratios.

[0046] In the present text, when describing embodiments or examples, it should be understood that they are not intended to limit the present application to these embodiments or examples. On the contrary, all alternatives, modifications and equivalents of the methods and materials described in the present application can be encompassed within the scope defined by the present application.

[0047] In the present text, for the sake of brevity, all possible combinations of the individual technical features in each embodiment or example are not described. Therefore, as long as the combinations of the technical features do not contradict each other, the individual technical features in each embodiment or example can be combined in any manner, and all possible combinations should be considered as being within the scope of the present specification.

[0048] The phenanthropyrrole structure has strong absorption in the whole ultraviolet region, and there is no problem of missing some wavelengths, so it can effectively protect the battery assembly; the conjugate range of the phenanthropyrrole structure is large, and the light emission efficiency is high, so it can more effectively convert ultraviolet light and blue-violet light into long-wave visible light for the battery; and the chemical properties of the phenanthropyrrole structure are stable, and it is stable to ultraviolet light and is not easy to decompose, so it can more effectively avoid the battery assembly from being damaged by ultraviolet light, which also helps to maintain the stability of the assembly. The present application adds light conversion materials based on the phenanthropyrrole structure to the adhesive film, which can effectively absorb ultraviolet light and blue-violet light in sunlight and convert them into blue fluorescence for the battery, and the material itself is stable to ultraviolet light and is not easy to decompose, so it can effectively avoid the battery assembly from being damaged by ultraviolet light, and improve the efficiency and service life of the battery.

[0049] The main body of the light conversion material in the light conversion adhesive film of the present application is constructed by the phenanthropyrrole structure. The mass fraction of the light conversion material in the light conversion adhesive film can be 0.001% to 3%. Controlling the amount of the light conversion material selected in the present application in the light conversion adhesive film within the preferred range is beneficial to improve the effect of the light conversion adhesive film on enhancing the efficiency and stability of the battery.

[0050] The light conversion adhesive film of the present application optionally or preferably can include an auxiliary agent. The available auxiliary agents include but are not limited to crosslinking agents, co-crosslinking agents, plasticizers, light stabilizers, antioxidants, water absorbents, etc.

[0051] In some embodiments, the light conversion adhesive film of the present application is composed of a light conversion material, a matrix and an optional auxiliary agent.

[0052] The compound of formula I

[0053] In the present application, the light conversion material in the light conversion adhesive film is selected from the compound of formula I, and the structure of the compound of formula I is as follows:

[0054]

[0055] In formula I, i and j are independently selected from integers from 0 to 10;

[0056] R1, R2, R3 and R4 are independently selected from hydrogen atom, cyano group, substituted or unsubstituted diphenylamine group, substituted or unsubstituted C1-C10 alkyl group, substituted or unsubstituted C2-C10 alkenyl group, substituted or unsubstituted C2-C10 alkynyl group, substituted or unsubstituted C1-C10 alkoxy group, substituted or unsubstituted C3-C10 cycloalkyl group, substituted or unsubstituted C6-C26 aryl group and substituted or unsubstituted five- to twenty-six-membered heteroaryl group, and the substituents on R1, R2, R3 and R4 are preferably each independently selected from one or more of halogen, C1-C10 alkyl group, C1-C10 alkoxy group, C2-C10 alkenyl group, C2-C10 alkynyl group, C2-C10 ester group and C2-C10 amide group;

[0057] Ar is selected from the group consisting of substituted or unsubstituted C6-C26 arylene and substituted or unsubstituted five- to twenty-six-membered heteroarylene, the substituents on Ar are preferably selected from one or more of halogen, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, C2-C10 ester and C2-C10 amide;

[0058] X1and X2are independently selected from the group consisting of oxygen atom, sulfur atom, selenium atom and -NR-; wherein R is selected from the group consisting of hydrogen atom, cyano, substituted or unsubstituted diphenylamine group, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C2-C10 alkenyl, substituted or unsubstituted C2-C10 alkynyl, substituted or unsubstituted C1-C10 alkoxy, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted C6-C26 aryl and substituted or unsubstituted five- to twenty-six-membered heteroaryl, the substituents on R are preferably selected from one or more of halogen, C1-C10 alkyl, C1-C10 alkoxy, C2-C10 alkenyl, C2-C10 alkynyl, C2-C10 ester and C2-C10 amide.

[0059] In some embodiments, in formula I, the diphenylamine group, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, C3-C10 cycloalkyl, C6-C26 aryl or five- to twenty-six-membered heteroaryl as R1, R2, R3and R4is substituted with one or more substituents selected from the group consisting of halogen, C1-C10 alkyl, C1-C10 alkoxy, C1-C10 alkyl, C2-C10 ester and C2-C10 amide.

[0060] In some embodiments, in formula I, Ar is selected from the group consisting of C6-C26 arylene and five- to twenty-six-membered heteroarylene, the C6-C26 arylene or five- to twenty-six-membered heteroarylene as Ar is substituted with one or more substituents selected from the group consisting of C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, C2-C10 ester and C2-C10 amide.

[0061] In some embodiments, the diphenylamine group, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, C3-C10 cycloalkyl, C6-C26 aryl or five- to twenty-six-membered heteroaryl as R is substituted with one or more substituents selected from the group consisting of halogen, C1-C10 alkyl, C1-C10 alkoxy, C2-C10 ester and C2-C10 amide.

[0062] Examples of halo-substituted C1alkyl groups in the present application include trifluoromethyl. In some embodiments, one or more of R1, R2, R3, R4, and R is trifluoromethyl.

[0063] In the present application, alkyl refers to a monovalent saturated group having a straight chain or branched structure composed of carbon atoms and hydrogen atoms. In the present application, the number of Cs preceding a group indicates the number of carbon elements contained in the group, for example, C1alkyl indicates an alkyl group containing 1 carbon atom, i.e., methyl. Alkyl groups suitable for use in the present application can be C1to C10alkyl groups, for example, C1alkyl, C2alkyl, C3alkyl, C4alkyl, C5alkyl, C6alkyl, C7alkyl, C8alkyl, C9alkyl, C10alkyl.

[0064] In the present application, alkenyl refers to an unsaturated group having a straight chain or branched structure composed of carbon atoms and hydrogen atoms, and containing a carbon-carbon double bond. Alkenyl groups suitable for use in the present application can be C2to C10alkenyl groups, for example, C2alkenyl, C3alkenyl, C4alkenyl, C5alkenyl, C6alkenyl, C7alkenyl, C8alkenyl, C9alkenyl, C10alkenyl.

[0065] In the present application, alkynyl refers to an unsaturated group having a straight chain or branched structure composed of carbon atoms and hydrogen atoms, and containing a carbon-carbon triple bond. Alkynyl groups suitable for use in the present application can be C2to C10alkynyl groups, for example, C2alkynyl, C3alkynyl, C4alkynyl, C5alkynyl, C6alkynyl, C7alkynyl, C8alkynyl, C9alkynyl, C10alkynyl.

[0066] In the present application, cycloalkyl refers to a monovalent saturated group having a cycloaliphatic structure composed of carbon atoms and hydrogen atoms, and the cycloalkyl group is connected to other parts of the molecule through a carbon atom on the cycloaliphatic ring. Cycloalkyl groups suitable for use in the present application can be C3to C10cycloalkyl groups, for example, C3cycloalkyl, C4cycloalkyl, C5cycloalkyl, C6cycloalkyl, C7cycloalkyl, C8cycloalkyl, C9cycloalkyl, C10cycloalkyl.

[0067] In the present application, alkoxy refers to -O-alkyl.

[0068] In the present application, aryl refers to a monovalent group having an aromatic ring structure composed of carbon atoms and hydrogen atoms, and the aryl group is connected to other parts of the molecule through a carbon atom on the aromatic ring. Aryl groups suitable for use in the present application can be C6to C20aryl groups, for example, phenyl, naphthyl, anthryl, phenanthryl.

[0069] In the present application, heteroaryl refers to a monovalent group having an aromatic ring structure composed of carbon atoms, hydrogen atoms, and heteroatoms (e.g., sulfur atoms, nitrogen atoms, oxygen atoms), and the heteroaryl group is connected to other parts of the molecule through a carbon atom or a heteroatom on the aromatic ring. Heteroaryl groups suitable for use in the present application can be five- to twenty-membered heteroaryl groups, and the number of members preceding a heteroaryl group indicates the number of ring-forming atoms of the heteroaromatic ring.

[0070] In the present application, arylene means a divalent group having an aromatic ring structure composed of carbon atoms and hydrogen atoms, and the arylene is connected to other parts of the molecule through a carbon atom on the aromatic ring. The arylene suitable for use in the present application can be a C6-C20arylene, including but not limited to phenylene (e.g., 1,4-phenylene).

[0071] In the present application, heteroarylene means a divalent group having an aromatic ring structure composed of carbon atoms, hydrogen atoms, and heteroatoms (e.g., sulfur atom, nitrogen atom, oxygen atom), and the heteroarylene is connected to other parts of the molecule through a carbon atom or a heteroatom on the aromatic ring. The heteroarylene suitable for use in the present application can be a five- to twenty-membered heteroarylene, the number of members before the heteroaryl means the number of ring-forming atoms of the heteroaromatic ring.

[0072] In the present application, hydrogen atom includes protium, deuterium, tritium.

[0073] In the present application, amine group means -NR a R b , R a and R b are each independently selected from the group consisting of H, C1-C10alkyl, C2-C10alkenyl, and C2-C10alkynyl.

[0074] In some preferred embodiments, the compound of formula I is a compound of formula II:

[0075]

[0076] In formula II, i is selected from an integer from 0 to 5;

[0077] R5is a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10alkyl group, a substituted or unsubstituted C2-C10alkenyl group, a substituted or unsubstituted C2-C10alkynyl group, a substituted or unsubstituted C1-C10alkoxy group, a substituted or unsubstituted C3-C10cycloalkyl group, a substituted or unsubstituted C6-C26aryl group, and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group, the substituents on R5are preferably selected from one or more of halogen, C1-C10alkyl, C1-C10alkoxy, C2-C10ester, and C2-C10amide; the halogen-substituted C1alkyl as R5is preferably trifluoromethyl;

[0078] X1and X2are each independently selected from an oxygen atom, a sulfur atom, a selenium atom, and -NR-; wherein R is selected from a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10alkyl group, a substituted or unsubstituted C2-C10alkenyl group, a substituted or unsubstituted C2-C10alkynyl group, a substituted or unsubstituted C1-C10alkoxy group, a substituted or unsubstituted C3-C10cycloalkyl group, a substituted or unsubstituted C6-C26aryl group, and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group, the substituents on R are preferably selected from one or more of halogen, C1-C10alkyl, C1-C10alkoxy, C2-C10ester, and C2-C10amide.

[0079] In some preferred embodiments, in formula II, i is selected from an integer from 0 to 2, for example, i can be 0, 1, 2; X1is selected from an oxygen atom and -NR-, wherein R is n-butyl or p-tert-butylphenyl; X2is selected from an oxygen atom and -NR-, wherein R is phenyl.

[0080] Compound 1, Compound 2, Compound 3, Compound 4, and Compound 5

[0081] In some preferred embodiments, the light conversion adhesive film of the present application comprises a compound selected from one or more of Compound 1, Compound 2, Compound 3, Compound 4, and Compound 5 as a light conversion material and a matrix:

[0082]

[0083] In some preferred embodiments, the light conversion material is Compound 4. This is advantageous for improving the efficiency of the light conversion adhesive film in light conversion.

[0084] In the present application, the hydrogen atom in Compound 1, Compound 2, Compound 3, Compound 4, and Compound 5 as a light conversion material can be protium, deuterium, or tritium.

[0085] Sources of compounds

[0086] Compound of formula I, compound of formula II, Compound 1 to Compound 5 can be prepared by the method disclosed in Boissarie, P. J. et al. A powerful palladium-catalyzed multicomponent process for the preparation of oxazolines and benzoxazole. Org. Lett. 2011, 13, 6256.

[0087] Matrix

[0088] In the present application, the substrate is preferably transparent to visible light. The substrate is transparent to visible light when its transmittance to visible light is ≥ 0.85.

[0089] The substrate is made of a polymer material, including but not limited to polyethylene terephthalate, polyvinyl butyral, ethylene-vinyl acetate copolymer, polyethylene, ethylene polytetrafluoroethylene, polyimide, polycarbonate, polystyrene, polyurethane, polyacrylate, silicone sol, silicone gel and polyolefin elastomer, and combinations thereof.

[0090] The refractive index of the substrate is preferably 1.4-1.7, for example 1.4, 1.5, 1.6, 1.7. This is beneficial to improve the effect of light conversion adhesive film on enhancing the efficiency and stability of the battery.

[0091] The mass fraction of the substrate in the light conversion adhesive film can be 80%-99.85%, for example 90%, 95%, 96%, 97%, 98%, 98.5%, 98.9%, 99%, 99.5%.

[0092] Auxiliary agent

[0093] Auxiliary agents suitable for use in the present application include, but are not limited to, crosslinking agents, co-crosslinking agents, plasticizers, light stabilizers, antioxidants, and water absorbents.

[0094] In the present application, the plasticizer, antioxidant, and water absorbent are optionally or preferably added to the light conversion adhesive film, and the amount thereof can be conventional.

[0095] In some embodiments, the thickness of the light conversion adhesive film of the present application is 0.1-1.0 mm, for example 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1.0 mm.

[0096] Preparation method of light conversion adhesive film

[0097] The light conversion adhesive film of the present application can be prepared by uniformly mixing the components of the light conversion adhesive film, melt-extruding the mixture into a film, and then cooling and setting the film.

[0098] Solar cell module

[0099] In a high-temperature, negative-pressure environment, the light conversion adhesive film of the present application is used as a front adhesive film to laminate and package a solar cell (e.g., a microcrystalline silicon solar cell) and a back adhesive film (which can be made of pure EVA) on a back plate (e.g., a glass plate), and then cool the module. The light conversion adhesive film becomes the front surface of the module, and the back adhesive film becomes the back surface of the module, to obtain a solar cell module.

[0100] In some preferred embodiments, the solar cell module comprises at least one of the following devices: a PN junction device comprising III-V or II-IV group elements, a Cu-In-Ga-Se (CIGS) thin film device, an organic sensitizer device, an organic thin film device, a quantum dot thin film device, an amorphous silicon solar cell, a microcrystalline silicon solar cell, and a crystalline silicon solar device.

[0101] The present application uses light conversion materials based on phenanthro-pyrrole structures to make the materials and the adhesive film both efficient and stable. The present application has the following beneficial technical effects: the derivative structures of phenanthro-pyrrole generally have the advantages of strong ultraviolet absorption, high luminescence efficiency, stable chemical properties, etc., and are ideal building units for light conversion materials. They can also have charge transfer interactions with other groups, which helps to further broaden the absorption spectrum and red shift the emission of the materials. In the present application, the derivative structures of phenanthro-pyrrole, including phenanthro-imidazole, phenanthro-oxazole, etc., are introduced into the molecules of the light conversion materials, making the materials both efficient and stable.

[0102] The phenanthro-pyrrole structure used in the present application is a fluorescent group that has strong absorption in the entire ultraviolet region. It has a large conjugated range and high luminescence efficiency, so it can more effectively convert ultraviolet and blue-violet light into long-wave visible light for use in solar cells. The present application adds light conversion materials based on phenanthro-pyrrole structures to the adhesive film. Such materials can effectively absorb ultraviolet and blue-violet light in sunlight and convert them into blue fluorescence for use in solar cells. The materials themselves are stable to ultraviolet light and are not easily decomposed, so they can effectively prevent solar cell modules from being damaged by ultraviolet light, improving the efficiency and lifespan of the solar cells.

[0103] The present application will be described below in the form of specific examples. It should be understood that these examples are merely illustrative and are not intended to limit the scope of the present application. The methods, reagents, and materials used in the examples are conventional in the art unless otherwise specified. The raw materials used to prepare compounds 1-5 in the examples were purchased from Shanghai Bide Pharmaceutical Technology Co., Ltd. The ethylene-vinyl acetate copolymer (EVA) used in the examples and comparative examples had a refractive index of 1.48.

[0104] The synthesis of compound 1-5 can be found in the literature: Wang, Z.; et al. Phenanthro[9,10-d]imidazole as a new building block for blue light emitting materials. J. Mater. Chem., 2011, 21, 5451. and Boissarie, P. J. et al. A powerful palladium-catalyzed multicomponent process for the preparation of oxazolines and benzoxazole. Org. Lett. 2011, 13, 6256, and was prepared by the following synthetic route.

[0105]

[0106] Example 1

[0107] This example provides a film with compound 1 as light conversion material and the corresponding device. The synthesis of compound 1 used in Example 1 is as follows:

[0108] S1 : 2.1 g of phenanthrenequinone, 2.0 g of p-bromo benzylamine and 3.2 g of silver carbonate were weighed and dissolved in 50 mL of dioxane, and refluxed at 80 °C under nitrogen atmosphere overnight. After the reaction was completed, the reaction solution was cooled and filtered, then the organic phase was washed with water and extracted with dichloromethane. The organic phases were combined, and after the solvent was removed, 2.0 g of intermediate 1 was obtained Yield 53%.

[0109] S2: 1.8 g of intermediate 1, 1.3 g of (4-(benzoxazol-2-yl)phenyl)boronic acid, 0.15 g of tetrakis(triphenylphosphine)palladium and 3.5 g of potassium carbonate were dissolved in 70 mL of mixed solvent (containing 50 mL of dioxane and 20 mL of deionized water), and refluxed at 80 °C under nitrogen atmosphere overnight. After the reaction was completed, the reaction solution was cooled and filtered, then the filter cake was washed with water and n-hexane, and the filter cake was recrystallized with ethyl acetate to obtain 2.4 g of compound 1, with a yield of 76%. The structure of compound 1 was confirmed by 1H NMR and MS. 1H NMR (400 MHz, CDC13): 8.52 (1H), 8.21 (1H), 8.07-8.08 (4H), 7.97 (1H), 7.86 (1H), 7.53-7.63 (9H), 7.42-7.45 (3H); Mass analysis results: m / z 488.15 (100.0%), 489.16 (36.8%), 490.16 (6.6%); Elemental analysis results: C, 83.59; H, 4.13; N, 5.73; O, 6.55.

[0110] The light conversion adhesive film was prepared by the following method:

[0111] 99.85% wt of EVA and 0.15% wt of compound 1 were mixed uniformly at 90°C by internal mixing. Then the mixture was placed in a release film and a lamination template, and laminated at 90°C and 25°C for 5 min, respectively, to obtain a light conversion adhesive film with a thickness of 0.3 mm.

[0112] The solar cell module was prepared by the following method:

[0113] The encapsulation glass, the light conversion adhesive film, the 210*105mm HJT cell sheet, the butyl adhesive, the pure EVA and the glass backboard were laminated and encapsulated under a negative pressure environment at 130°C, and the light conversion adhesive film was used as the front surface of the cell to obtain the solar cell module of Example 1.

[0114] Example 2

[0115] This example provides an adhesive film using compound 2 as a light conversion material and a corresponding device. The synthesis method of compound 2 used in Example 2 is as follows:

[0116] S1: 2.1 g of phenanthraquinone, 1.9 g of p-bromobenzaldehyde, 0.9 g of n-butylamine and 15 g of ammonium acetate were dissolved in 150 mL of glacial acetic acid, and refluxed at 110°C under a nitrogen atmosphere overnight. After the reaction was completed, the reaction solution was cooled and filtered, and then the filter cake was washed with water and n-hexane to obtain 3.6 g of intermediate 2 with a yield of 83%.

[0117] S2: 2.2 g of intermediate 2, 1.8 g of (4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)boronic acid, 0.15 g of tetrakis(triphenylphosphine)palladium and 3.5 g of potassium carbonate were dissolved in 70 mL of a mixed solvent containing 50 mL of dioxane and 20 mL of deionized water, and refluxed at 80°C under a nitrogen atmosphere overnight. After the reaction was completed, the reaction solution was cooled and filtered, and then the filter cake was washed with water and n-hexane alternately, and recrystallized with ethyl acetate to obtain 2.4 g of compound 2 with a yield of 76%.1 H NMR (400 MHz, CDC13): 8.84 (1H), 8.21 (1H), 8.00 (1H), 7.76-7.81 (6H), 7.33-7.64 (16H), 4.23 (2H), 1.78 (2H), 1.37 (2H), 0.93 (3H); Mass analysis results: m / z 618.28 (100.0%), 619.28 (47.6%), 620.29 (11.1%), 619.28 (1.5%); Elemental analysis results: C, 85.41; H, 5.54; N, 9.05.

[0118] The light conversion adhesive film and solar cell module of Example 2 were prepared by using the similar method as that of Example 1, except that compound 1 was replaced by compound 2 with the same mass fraction in the process of manufacturing the light conversion adhesive film.

[0119] Example 3

[0120] This example provides an adhesive film and corresponding device using compound 3 as the light conversion material. The synthesis method of compound 3 used in Example 3 is similar to that of compound 2, except that 0.9 g of n-butylamine was replaced by 1.8 g of 4-tert-butyl aniline in step S1. In step S2, 1.8 g of (4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)boronic acid was replaced by 1.3 g of (4-(benzoxazol-2-yl)phenyl)boronic acid. The 1 H NMR (400 MHz, CDC13): 8.84 (1H), 8.21 (1H), 8.00 (1H), 7.76-7.81 (6H), 7.33-7.64 (16H), 4.23 (2H), 1.78 (2H), 1.37 (2H), 0.93 (3H); Mass analysis results: m / z 618.28 (100.0%), 619.28 (47.6%), 620.29 (11.1%), 619.28 (1.5%); Elemental analysis results: C, 85.41; H, 5.54; N, 9.05.

[0121] The light conversion adhesive film and solar cell module of Example 3 were prepared by using the similar method as that of Example 1, except that compound 1 was replaced by compound 3 with the same mass fraction in the process of manufacturing the light conversion adhesive film.

[0122] Example 4

[0123] This example provides an adhesive film and corresponding device using compound 4 A film and corresponding device for light conversion material. The synthesis of compound 4 used in example 4 is similar to compound 3 except that 1.8 g of 4-tert-butyl aniline is replaced by 0.9 g of n-butyl amine in step S1. The compound 4 is characterized by 1 H NMR (400 MHz, CDC13): 8.84 (1H), 8.22 (1H), 8.08 (2H), 7.93 (1H), 7.75-7.80 (3H), 7.60-7.63 (4H), 7.50-7.56 (5H), 7.41-7.45 (5H), 7.30 (2H), 1.34 (9H); Mass analysis result: m / z 619.26 (100.0%), 620.27 (47.6%), 621.27 (11.1%), 620.26 (1.1%); Elemental analysis result: C, 85.27; H, 5.37; N, 6.78; O, 2.58.

[0124] A film and corresponding device for light conversion material. The synthesis of compound 4 used in example 4 is similar to compound 3 except that 1.8 g of 4-tert-butyl aniline is replaced by 0.9 g of n-butyl amine in step S1. The compound 4 is characterized by

[0125] Example 5

[0126] This example provides a film and corresponding device for light conversion material with compound 5 The synthesis of compound 5 used in example 5 is similar to compound 2 except that 0.9 g of n-butyl amine is replaced by 1.8 g of 4-tert-butyl aniline in step S1. The compound 5 is characterized by 1 H NMR (400 MHz, CDC13): 8.84 (1H), 8.75 (1H), 8.73 (1H), 7.92 (1H), 7.77 (1H), 7.62-7.70 (7H), 7.58-7.45 (11H), 7.39-7.35 (3H), 7.30-7.32 (1H), 7.27 (1H), 7.20 (1H), 1.37 (9H); Mass analysis result: 694.31 (100.0%), 695.31 (54.1%), 696.32 (14.3%), 697.32 (1.7%), 695.31 (1.5%); Elemental analysis result: C, 86.42; H, 5.51; N, 8.06.

[0127] A film and corresponding device for light conversion material. The synthesis of compound 4 used in example 4 is similar to compound 3 except that 1.8 g of 4-tert-butyl aniline is replaced by 0.9 g of n-butyl amine in step S1. The compound 4 is characterized by

[0128] Comparative Example 1

[0129] The light conversion adhesive film and solar cell module of Comparative Example 1 were prepared by a similar method as in Example 1, except that no light conversion material was added in the process of manufacturing the light conversion adhesive film, and the adhesive film component was 100% EVA.

[0130] Comparative Example 2

[0131] The light conversion adhesive film and solar cell module of Comparative Example 2 were prepared by a similar method as in Example 1, except that compound 1 was replaced by an equivalent mass fraction of triazole material 6 in the process of manufacturing the light conversion adhesive film. The triazole material 6 was purchased from Shanghai Bide Pharmaceutical Technology Co., Ltd.

[0132] Test Example

[0133] I. Photophysical property test: The photophysical properties of the light conversion materials in each example and comparative example were tested using an ultraviolet-visible spectrometer, a fluorescence spectrometer, and an integrating sphere. The absorption spectrum of the light conversion material was measured by a Shimadzu UV-1900i ultraviolet-visible spectrometer, and the emission spectrum, PLQY, and in-situ photoluminescence decay test were measured by an Edinburgh FS-5 spectrometer and its integrating sphere accessory. The test results are shown in Table 1, Figure 1 , Figure 2 .

[0134] Table 1: Comparison of photophysical properties of materials in each example and comparative example

[0135]

[0136]

[0137] As can be seen from Table 1, the luminescent efficiency of compounds 1-5 in the present application is comparable to that of triazole material 6, but the luminescence peak of compounds 1-5 has a red shift of 10-30 nm compared to triazole material 5. Since the emission spectrum of compounds 1-5 is in the 300-600 nm range, the utilization efficiency of sunlight by the HJT cell will increase rapidly with the increase of wavelength, and the red shift of the emission spectrum can effectively improve the light conversion effect. Therefore, the use of the materials in the present application can more effectively improve the cell efficiency. At the same time, the light conversion materials in the present application have more comprehensive absorption of ultraviolet light, and therefore can better protect the cell materials. The absorption broadening and luminescence red shift of the materials can be attributed to the larger conjugation range on the one hand, and the groups used to construct the current materials have certain electron-donating / withdrawing ability, so the excited state of the corresponding molecule has the characteristics of local-charge transfer excitation (HLCT). The local excitation characteristics of the molecule ensure its luminescent efficiency, while the charge transfer excitation characteristics can enhance the absorption of the material in the long wave region (corresponding to the absorption shoulder of compound 1 at 400 nm) and increase its Stokes shift. Figure 2

[0138] ​II. Device performance test: In order to evaluate the performance of the solar cell module to illustrate the effect of the present application, the power test and UV aging test are carried out on the solar cell modules in each example and comparative example. The power test uses ANPA1000 tester of Shandong Aino Instrument Co., Ltd., and the UV aging uses UV2000 ultraviolet aging box of Shanghai Eryuan Test Equipment Co., Ltd. at 85℃ for 60kWh / m 2 UV aging, and the results are shown in Table 2.

[0139] Table 2: Comparison of efficiency and decay rate of modules in different examples and comparative examples

[0140]

[0141] The current material has high luminous efficiency and large Stokes shift at the same time, so it can convert ultraviolet light to a band with higher utilization efficiency of the battery. At the same time, the current material absorbs ultraviolet light and deep blue light more comprehensively, so it protects the battery from ultraviolet light damage more effectively. As can be seen from Table 2, the light conversion material in the present application is better than the triazole material in improving the power and stability of the module.

Claims

1. A compound of formula I: ###0001### wherein i and j are independently selected from an integer from 0 to 10; R1, R2, R3 and R4 are independently selected from a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group; Ar is selected from a substituted or unsubstituted C6-C26 arylene group and a substituted or unsubstituted five- to twenty-six-membered heteroarylene group; X1 and X2 are independently selected from an oxygen atom, a sulfur atom, a selenium atom and -NR-; wherein R is selected from a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group.

2. The compound of claim 1, wherein the substituents on R1, R2, R3, R4, Ar and R are each independently selected from one or more of halogen, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, C2-C10 ester and C2-C10 amide.

3. The compound of claim 1, wherein one or more of R1, R2, R3, R4 and R is a trifluoromethyl group.

4. The compound of claim 1, which is a compound of formula II: ###0002### wherein i is an integer from 0 to 5; R5 is a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group, and the substituents on R5 are selected from one or more of halogen, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, C2-C10 ester and C2-C10 amide; preferably, the halogen-substituted C1 alkyl group as R5 is a trifluoromethyl group.

5. The compound of claim 4, wherein i is an integer from 0 to 3.

2. The compound of claim 1, of formula I, wherein 6. The compound of claim 4, wherein R5 is a hydrogen atom, a cyano group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group.

3. The compound of claim 1 of formula I, wherein 7. The compound of claim 4, wherein R5 is a hydrogen atom, a cyano group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group.

4. The compound of claim 1 of formula I, wherein 8. The compound of claim 4, wherein R5 is a hydrogen atom, a cyano group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group.

9. The compound of claim 4, wherein R5 is a hydrogen atom, a cyano group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group.

10. The compound of claim 4, wherein R5 is a hydrogen atom, a cyano group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C6-C26 aryl group and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group. X1and X2are each independently selected from the group consisting of an oxygen atom, a sulfur atom, a selenium atom, and -NR-; wherein R is selected from the group consisting of a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10alkyl group, a substituted or unsubstituted C2-C10alkenyl group, a substituted or unsubstituted C2-C10alkynyl group, a substituted or unsubstituted C1-C10alkoxy group, a substituted or unsubstituted C3-C10cycloalkyl group, a substituted or unsubstituted C6-C26aryl group, and a substituted or unsubstituted five- to twenty-six-membered heteroaryl group, the substituents on R being selected from one or more of a halogen, a C1-C10alkyl group, a C2-C10alkenyl group, a C2-C10alkynyl group, a C1-C10alkoxy group, a C2-C10ester group, and a C2-C10amide group; Preferably, in formula II, i is 2, R5is a hydrogen atom, and X1and X2are each independently selected from the group consisting of an oxygen atom, a sulfur atom, a selenium atom, and -NR-; wherein R is selected from the group consisting of a hydrogen atom, a cyano group, a substituted or unsubstituted diphenylamine group, a substituted or unsubstituted C1-C10alkyl group, a substituted or unsubstituted C2-C10alkenyl group, a substituted or unsubstituted C2-C10alkynyl group, a substituted or unsubstituted C1-C10alkoxy group, a substituted or unsubstituted C3-C10cycloalkyl group, a substituted or unsubstituted C6-C10aryl group, and a substituted or unsubstituted five- to ten-membered heteroaryl group, the substituents on R being selected from one or more of a halogen, a C1-C10alkyl group, a C1-C10alkoxy group, a C2-C10ester group, and a C2-C10amide group; Preferably, in formula II, i is 2, R5is a hydrogen atom, and X1and X2are each independently selected from the group consisting of an oxygen atom and -NR-; wherein R is selected from the group consisting of a hydrogen atom, a substituted or unsubstituted C1-C6alkyl group, and a substituted or unsubstituted C6-C10aryl group, the substituents on R being one or more C1-C6alkyl groups. Preferably, the compound of formula I is selected from the following compounds 1-5:

5. Use of a compound of formula I according to any one of claims 1 to 4 as a light conversion agent.

6. A light conversion film comprising a compound of formula I according to any one of claims 1 to 4, characterized in that The light conversion adhesive film further comprises a matrix which is transparent to visible light.

7. The light-converting adhesive film as described in claim 6, characterized in that, The light conversion adhesive film has one or more of the following characteristics: The mass fraction of the compound of formula I in the light conversion adhesive film is 0.001% to 3%, preferably 0.01% to 0.5%; The matrix is selected from one or more of polyethylene terephthalate, polyvinyl butyral, ethylene-vinyl acetate copolymer, polyethylene, ethylene polytetrafluoroethylene, polyimide, polycarbonate, polystyrene, polyurethane, polyacrylate, silicone sol, silicone gel, and polyolefin elastomer; The refractive index of the matrix is 1.4 to 1.7; The thickness of the light conversion adhesive film is 0.1 to 1.0 mm; The light conversion adhesive film further comprises an additive selected from one or more of a crosslinking agent, a co-crosslinking agent, a plasticizer, a light stabilizer, an antioxidant, and a water absorbent; preferably, the light conversion adhesive film comprises a crosslinking agent and a co-crosslinking agent, and optionally one or more selected from a plasticizer, a light stabilizer, an antioxidant, and a water absorbent.

8. A method of producing the light conversion adhesive film according to claim 6 or 7, characterized in that, The method comprises: uniformly mixing components of the light conversion adhesive film, melt-extruding the components into a film, and cooling and setting the film to obtain the light conversion adhesive film.

9. A solar cell module characterized by comprising: The solar cell module comprises the light conversion adhesive film of claim 6 or 7. Preferably, the solar cell module comprises one or more of the following devices: a PN junction device containing III-V or II-IV group elements, a Cu-In-Ga-Se thin film device, an organic sensitizer device, an organic thin film device, a quantum dot thin film device, an amorphous silicon solar cell device, a microcrystalline silicon solar cell device, and a crystalline silicon solar device.

10. A method of enhancing the efficiency and / or stability of a solar cell, characterized by, The method comprises: introducing the light conversion adhesive film of claim 6 or 7 into a solar cell.

11. The method for enhancing solar cell efficiency and stability according to claim 10, wherein, The solar cell comprises one or more of the following devices: a PN junction device containing III-V or II-IV group elements, a Cu-In-Ga-Se thin film device, an organic sensitizer device, an organic thin film device, a quantum dot thin film device, an amorphous silicon solar cell device, a microcrystalline silicon solar cell device, and a crystalline silicon solar device.

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