Benzotriazole compound, light conversion agent, light conversion film and solar cell

Abstract

The invention belongs to the field of solar cells, and particularly relates to a benzotriazole compound, a light conversion agent, a light conversion film and a solar cell. The invention provides a compound shown in a formula I, a light conversion agent with the structure of the compound shown in the formula I, a light conversion film comprising the light conversion agent and a solar cell comprising the light conversion film. Compared with the current light conversion film technology, the light conversion film has the advantages that (1) the adjustable range of the absorption wavelength of the light conversion film is wider, and the absorption of shorter wavelength can be realized; and (2) the same ultraviolet shielding function under a certain cut-off wavelength is realized, and the required amount of the light conversion agent is less.

Description

Technical Field

[0001] This invention belongs to the field of solar cells, specifically relating to a benzotriazole compound, a light-converting agent, a light-converting film, and a solar cell. Background Technology

[0002] Crystalline silicon solar cells have developed rapidly, with current technologies including Top-Tunneling Oxide Passivation (TOPCon), Heterojunction (HJT), and Back-Contact (BC). The next generation of products is perovskite and perovskite tandem cells. While cell technology has advanced and efficiency has increased, reliability issues have arisen. Among these, UV tolerance has become increasingly prominent. Addressing UV degradation in modules is a crucial issue in current and future cell development. Light conversion film technology has emerged to address this. Currently, marketed light conversion films primarily target the UV resistance issues of HJT cells, absorbing ultraviolet light below 380nm and converting it into blue light. However, TOPCon and BC cells have a high response to ultraviolet light, meaning that absorbing ultraviolet light below 380nm results in significant power loss. For perovskite and perovskite tandem cell technologies, absorbing ultraviolet light below 380nm cannot guarantee module reliability; absorbing ultraviolet light with longer wavelengths is necessary to meet reliability testing requirements. Therefore, a light conversion technology with tunable absorption wavelength and a sufficiently wide range is needed to meet the needs of the evolving battery technology in order to balance component reliability and power.

[0003] CN103562323A discloses almost all structures with benzotriazole as the core, but the shortest absorption wavelength peak of its light-converting agent is 340nm, and the film prepared using this light-converting agent can only block ultraviolet light with wavelengths below 380nm.

[0004] CN117700442A discloses that introducing trimethyl(oxy)silicon at the N position of benzotriazole can only block ultraviolet light below 380nm. Summary of the Invention

[0005] The purpose of this invention is to provide a benzotriazole compound, a light-converting agent, a light-converting film, and a solar cell to solve the technical problem that the light-converting film in the prior art has poor absorption of short-wavelength light.

[0006] In a first aspect, the present invention provides a compound of formula I:

[0007]

[0008] R1 is selected from substituted or unsubstituted C1-C10 alkyl groups and substituted or unsubstituted C3-C10 cycloalkyl groups;

[0009] R2 is selected from substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C2-C10 alkenyl, substituted or unsubstituted C2-C10 alkynyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C10 alkylthio, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted 3-14 membered heterocyclic, substituted or unsubstituted C6-C14 aryl, substituted or unsubstituted 5-14 membered heteroaryl, substituted or unsubstituted amino, halogen, cyano, nitro, hydroxyl, carboxyl, azide and -CO-(C1-C10 alkyl);

[0010] Ar is selected from substituted or unsubstituted C6-C14 aryl groups and substituted or unsubstituted 5-14 heteroaryl groups;

[0011] The 3-14 membered heterocyclic group and the 5-14 membered heteroaryl group each independently include 1, 2 or 3 heteroatoms selected from N, O and S;

[0012] The halogen is F, Cl, Br or I.

[0013] In one or more embodiments, the substituents on the C1-C10 alkyl group that is substituted for R2 are 1, 2 or 3 C1-C10 alkoxy groups.

[0014] In one or more embodiments, in the substituted or unsubstituted C1-C20 alkyl group as R2, the C atom directly bonded to the nitrogen atom of benzotriazole is carbon number 1, and the carbon atom bonded to carbon number 1 in the substituted or unsubstituted C1-C20 alkyl group as R2 is a tertiary carbon; or, in the substituted or unsubstituted C1-C20 alkyl group as R2, the C atom directly bonded to the nitrogen atom of benzotriazole is a tertiary carbon.

[0015] In one or more embodiments, the substituents on the substituted C6-C14 aryl group or the substituted 5-14 heteroaryl group of Ar are 1, 2, 3 or 4 selected from -NR. a R b Substituents such as C1-C10 alkyl, NC-(C1-C10 alkylene)-, C1-C10 alkoxy, C6-C14 aryl, -CO-(C6-C14 aryl) and 5-14 heteroaryl groups having 1, 2 or 3 heteroatoms selected from N, O and S, R a and R b Each is independently selected from hydrogen, C1-C10 alkyl and C6-C14 aryl.

[0016] In one or more embodiments, R1 is selected from unsubstituted C1-C6 alkyl and unsubstituted C3-C8 cycloalkyl; preferably, R1 is selected from unsubstituted C1-C4 alkyl.

[0017] In one or more embodiments, R2 is selected from carboxyl, amino, -NH(C1-C10 alkyl), -N(C1-C10 alkyl)2, -CO-(C1-C10 alkyl), C3-C10 cycloalkyl, 5-14 membered heterocyclic group having 1, 2 or 3 heteroatoms selected from N, O and S, C6-C14 aryl, 5-14 membered heteroaryl group having 1, 2 or 3 heteroatoms selected from N, O and S, C1-C10 alkoxy, C2-C10 alkenyl, substituted C1-C10 alkyl and unsubstituted C1-C10 alkyl, wherein the substituents on the substituted C1-C10 alkyl group of R2 are 1, 2 or 3 C1-C6 alkoxy groups.

[0018] In one or more embodiments, R2 is selected from C6-C14 aryl, 5-7 heteroaryl having 1, 2 or 3 heteroatoms selected from N, O and S, C1-C10 alkoxy, substituted C1-C10 alkyl and unsubstituted C1-C10 alkyl, wherein the substituent of the substituted C1-C10 alkyl of R2 is C1-C6 alkoxy; preferably, R2 is unsubstituted C1-C10 alkyl.

[0019] In one or more embodiments, R2 is selected from:

[0020]

[0021] Where * represents the site where R2 is connected to other parts of the compound of formula I.

[0022] In one or more embodiments, the substituents on the substituted C6-C14 aryl group or the substituted 5-14 heteroaryl group of Ar are 1, 2, 3 or 4 selected from -NR. a R b C1-C6 alkyl, NC-(C1-C6 alkylene)-, C1-C6 alkoxy, C6-C14 aryl, -CO-(C6-C14 aryl) and substituents having 1, 2 or 3 heteroatoms selected from N, O and S, R a and R b Each is independently selected from C6-C14 aryl groups.

[0023] In one or more embodiments, Ar is a substituted or unsubstituted C6-C14 aryl group, or a substituted or unsubstituted 5-14 membered heteroaryl group having 1, 2, or 3 N, O, and S atoms. The substituents on the substituted C6-C14 aryl group of Ar are preferably 1, 2, 3, or 4 selected from -NR. a R b Substituents of C1-C6 alkyl groups, R a and R b Each is independently selected from C6-C14 aryl groups.

[0024] In one or more embodiments, Ar is an unsubstituted fluorenyl group, a fluorenyl group substituted with one or two C1-C6 alkyl groups, an unsubstituted phenyl group, or a fluorenyl group substituted with one, two, or three groups selected from -NR. a R b Phenyl groups substituted with C1-C6 alkyl groups, R a and R b Each is independently selected from C6-C14 aryl groups.

[0025] Preferably, the substituent of the phenyl group substituted for Ar is in a para-position relative to the other parts of the compound; and / or, the substituent of the fluorenyl group substituted for Ar is located on the non-aromatic ring of the substituted fluorenyl group.

[0026] In one or more implementations, Ar is selected from:

[0027]

[0028] Where * represents the site where Ar is connected to other parts of the compound of formula I.

[0029] In one or more embodiments, the compound of formula I is selected from:

[0030]

[0031] A second aspect of the present invention provides the use of the compound of formula I described in the first aspect of the present invention as a light-converting agent.

[0032] A third aspect of the present invention provides a light-converting film comprising a matrix resin and a compound of formula I as described in the first aspect of the present invention.

[0033] In one or more embodiments, the matrix resin is selected from one or more of POE, EVA, EPE, PVB and silicone; and / or, the mass ratio of the compound of formula I to the matrix resin is (1-20):1000, preferably (1-1.5):1000.

[0034] In a fourth aspect, the present invention provides a solar cell comprising the light-converting film described in the third aspect of the present invention; preferably, the solar cell is selected from tunneling oxide passivation cells and back contact cells.

[0035] The present invention has the following beneficial effects:

[0036] (1) Compared with the current light conversion film technology, the light conversion film of the present invention has a wider range of adjustable absorption wavelengths and can achieve absorption at shorter wavelengths.

[0037] (2) Compared with the current light conversion film technology, the amount of light conversion agent required by the present invention is less to achieve the same ultraviolet shielding function at a certain cutoff wavelength.

[0038] (3) The structure of the light-converting agent of the present invention is stable.

[0039] This invention designs a novel optical conversion agent system: by introducing alkyl (such as methyl) or cycloalkyl groups with tunable spectral absorption at positions 5 and 6 of benzotriazole compounds, the absorption wavelength can be cut off from a shorter wavelength by controlling the molecular structure.

[0040] This invention primarily achieves a blue shift in the absorption wavelength of the light-converting agent by introducing alkyl or cycloalkyl groups with tunable spectral absorption onto the benzene ring of benzotriazole. This is due to the electronic effects and steric hindrance inherent in the alkyl or cycloalkyl groups themselves, which reduce the effective conjugated area of ​​the light-converting agent molecule after introduction, thus causing a blue shift in the absorption wavelength. Simultaneously, the blue shift in the absorption wavelength reduces the distance between the two absorption peaks of the light-converting agent. This allows for a reduction in the amount of light-converting agent required to block light below a certain wavelength, thereby achieving cost reduction. Attached Figure Description

[0041] Figure 1 The results are the DFT calculations of the absorption spectra of the four compounds shown in the figure.

[0042] Figure 2 These are the absorption spectra of the light-converting films prepared in Example 1 and Comparative Example 1.

[0043] Figure 3 These are the absorption spectra of the light-converting films prepared in Example 2 and Comparative Example 2.

[0044] Figure 4 This is a comparison of the light transmittance of the light-converting films prepared in Example 2 and Comparative Example 2. Detailed Implementation

[0045] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0046] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0047] In this document, the terms “contains,” “includes,” “containing,” and similar terms encompass the meanings of “basically composed of” and “composed of.” For example, when this document discloses “A contains B and C,” “A is basically composed of B and C” and “A is composed of B and C” should be considered as having been disclosed in this document.

[0048] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0049] Unless otherwise specified, percentages refer to mass percentages and proportions refer to mass ratios in this article.

[0050] In this document, when describing embodiments or examples, it should be understood that it is not intended to limit the invention to those embodiments or examples. Rather, all alternatives, modifications, and equivalents of the methods and materials described herein are covered within the scope defined by the claims.

[0051] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0052] When a substituent is described using a conventional chemical formula written from left to right, it also includes chemically equivalent substituents obtained when the structural formula is written from right to left. For example, -CH2O- is equivalent to -OCH2-.

[0053] Certain chemical groups defined herein are preceded by simplified symbols to indicate the total number of carbon atoms present in the group. For example, C1-C6 alkyl refers to alkyl groups having a total of 1 to 6 carbon atoms as defined below. The total number of carbon atoms in the simplified symbols does not include carbons that may be present in substituents of the group.

[0054] When a variable is referred to in this disclosure as “selected from: …”, it means that the variable is selected from any of the options listed after the colon, or, where possible, that the variable is selected from one or more of the options listed after the colon.

[0055] All numerical ranges mentioned in this disclosure refer to the range including its two endpoints, all integers within the range, and subranges formed by these integers.

[0056] Except as for the foregoing, when used in the specification and claims of this disclosure, the following terms shall have the following meanings unless otherwise specifically indicated.

[0057] As used herein, “optional” or “optionally” means that the event or condition described below may or may not occur, and the description includes both the occurrence and non-occurrence of the event or condition.

[0058] As used herein, the term “substitution,” regardless of whether it is preceded by the term “optionally” (i.e., equivalent to substitution or unsubstitution), means that one or more hydrogen atoms of a specified group or portion are replaced by a “suitable substituent.” In this document, the number of substituents can be one or more, i.e., 1, 2, 3, 4, 5, or 6 or more, depending on the substituted group and the nature of the substituents. For example, when the substituent of an ethyl group is a halogen, the group can be replaced by 1, 2, 3, 4, or 5 substituents, depending on the structure of the substituted group, such as trifluoromethyl, pentafluoroethyl, etc. In some embodiments, the number of substituents is 1, 2, or 3. In some embodiments, the number of substituents is 1 or 2. In some embodiments, the number of substituents is 1. It will be understood that “substitution” or “replaced by” includes the implicit condition that such substitution is carried out according to the permissible valence of the substituted atom and that the substitution produces a stable or chemically viable compound, such as a compound that does not spontaneously transform, for example, through rearrangement, cyclization, elimination, etc. Unless otherwise stated, an "optionally substituted" group may have suitable substituents at each substituted position of the group, and when more than one position in any given structure can be substituted by more than one substituent selected from the specified group, the substituents may be the same or different at each position. Those skilled in the art will understand that the substituent itself may be substituted if appropriate.

[0059] For the purposes of this application, the term "suitable substituents" as used above should be understood to include, but is not limited to, alkyl, alkenyl, alkynyl, halogen, haloalkyl, haloalkenyl, haloalkynyl, alkoxy, cyano, hydroxyl, amino, monoalkylamino, dialkylamino, nitro, aryl, heteroaryl, cyclic hydrocarbon (e.g., cycloalkyl, cycloalkenyl, etc.), heterocyclic, etc., as described herein; these substituents, including alkyl, alkenyl, alkynyl, alkyl in haloalkyl, alkenyl in haloalkenyl, alkynyl in haloalkynyl, alkoxy, alkyl in monoalkylamino, alkyl in dialkylamino, aryl, heteroaryl, cyclic hydrocarbon, and heterocyclic groups themselves, are also optionally substituted, for example, they may also be optionally substituted by one or more groups selected from alkyl, halogen, haloalkyl, alkoxy, hydroxyl, amino, monoalkylamino, dialkylamino, nitro, aryl, heteroaryl, cyclic hydrocarbon, and heterocyclic groups.

[0060] As used herein, "alkyl" refers to a straight-chain or branched monovalent saturated hydrocarbon group having a specified number of carbon atoms. Specifically, alkyl groups are those having 1 to 20 carbon atoms ("C1-C20 alkyl"), typically containing 1 to 16 carbon atoms (C1-C16 alkyl), preferably containing 1 to 10 carbon atoms (C1-C10 alkyl), and more preferably containing 1 to 6 carbon atoms (C1-C6 alkyl). Examples of alkyl groups include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, etc. In some embodiments, the alkyl group suitable for use in this invention can be C1-C20 alkyl, such as C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl, C7 alkyl, C8 alkyl, C9 alkyl, C10 alkyl, C11 alkyl, C12 alkyl, C13 alkyl, C14 alkyl, C15 alkyl, C16 alkyl, C17 alkyl, C18 alkyl, C19 alkyl, and C20 alkyl.

[0061] As used herein, as part of a group or other group, the term "alkenyl" refers to a straight-chain or branched hydrocarbon chain group consisting only of carbon and hydrogen atoms and containing at least one double bond, which is linked by a single bond to the rest of the molecule. In some embodiments, the alkenyl group contains 2 to 20 carbon atoms ("C2-C20 alkenyl"), preferably 2 to 10 carbon atoms ("C2-C10 alkenyl"), and more preferably 2 to 6 carbon atoms ("C2-C6 alkenyl"). Non-limiting examples of alkenyl groups include, but are not limited to, vinyl, propenyl, allyl, butenyl, but-1-enyl, but-2-enyl, pentenyl, pent-1-enyl, pentadienyl, pent-1,4-dienyl, etc. Unless otherwise specifically specified in this specification, the alkenyl group may optionally be substituted. In some embodiments, the alkenyl groups suitable for use in this invention can be C2-C10 alkenyl groups, such as C2 alkenyl, C3 alkenyl, C4 alkenyl, C5 alkenyl, C6 alkenyl, C7 alkenyl, C8 alkenyl, C9 alkenyl, and C10 alkenyl groups.

[0062] As used herein, as part of a group or other group, the term "alkynyl" refers to a straight-chain or branched hydrocarbon chain group consisting only of carbon and hydrogen atoms, having one or more carbon-carbon triple bonds (-C≡C-), which are connected by single bonds to the rest of the molecule. In some embodiments, the alkynyl group contains 2 to 20 carbon atoms ("C2-C20 alkynyl"), preferably 2 to 10 carbon atoms ("C2-C10 alkynyl"), and more preferably 2 to 6 carbon atoms ("C2-C6 alkynyl"). Non-limiting examples of alkynyl groups include ethynyl, 1-propynyl, 1-methyl-2-propynyl, 2-propynyl, 1-butynyl, and 2-butynyl. Unless otherwise specifically specified in this specification, the alkynyl group may optionally be substituted. In some embodiments, the alkynyl group suitable for use in this invention can be a C2-C10 alkynyl group, such as C2 alkynyl, C3 alkynyl, C4 alkynyl, C5 alkynyl, C6 alkynyl, C7 alkynyl, C8 alkynyl, C9 alkynyl, or C10 alkynyl.

[0063] As used herein, "cycloalkyl" or "carbocyclic" refers to a saturated cyclic hydrocarbon having 3 to 10 ring carbon atoms (C3, C4, C5, C6, C7, C8, C9, C10) comprising one ring such as cyclohexyl or multiple rings such as adamantyl. Cycloalkyl groups comprising more than one ring can be fused, spirocyclic, bridged, or combinations thereof. Preferred cycloalkyl groups are saturated cyclic hydrocarbons having 3 to 8 ring carbon atoms ("C3-C8 cycloalkyl"). In some embodiments, the cycloalkyl group has 4 to 6 ring carbon atoms ("C4-C6 cycloalkyl"). Examples of cycloalkyl groups include adamantyl, decahydronaphthyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl.

[0064] As used herein, as a group or part of another group, the term "heterocyclic group" or "heterocycle" means a stable, saturated or partially unsaturated non-aromatic cyclic group or part consisting of carbon atoms (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14 carbon atoms) and heteroatoms selected from nitrogen, phosphorus, oxygen and sulfur (preferably nitrogen, oxygen or sulfur) (e.g., 1 to 6 heteroatoms, more preferably 1, 2 or 3 heteroatoms). In some embodiments, the heterocyclic group may contain 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 cyclic atoms, for example 3 to 20 cyclic atoms, 3 to 19 cyclic atoms, 3 to 18 cyclic atoms, 3 to 17 cyclic atoms, 3 to 16 cyclic atoms, 3 to 15 cyclic atoms, 4 to 12 cyclic atoms, 4 to 10 cyclic atoms, 4 to 9 cyclic atoms, 4 to 8 cyclic atoms, 4 to 7 cyclic atoms, 4 to 6 cyclic atoms, or 4 to 5 cyclic atoms. Unless otherwise specifically indicated in this specification, heterocyclic groups can be monocyclic, bicyclic, tricyclic, or more ring systems, which may include fused / fused ring systems (i.e., fused heterocyclic groups, such as 4-9 membered fused heterocyclic groups), bridged ring systems (i.e., bridged heterocyclic groups, such as 6-12 membered bridged heterocyclic groups), or spirocyclic systems (i.e., spirocyclic groups, such as 6-12 membered spirocyclic groups). A fused heterocyclic group refers to a ring system consisting of multiple (e.g., two, three, or more) rings, wherein at least two rings are bonded to each other by sharing two adjacent atoms (i.e., the at least two rings share a covalent bond, thereby directly connecting the bridgehead atoms), preferably a bicyclic fused heterocyclic group. A bridged heterocyclic group refers to a ring system consisting of multiple (e.g., two, three, or more) rings, wherein at least two rings are bonded to each other by sharing three or more atoms (the at least two rings are separated by a bridge containing at least one atom between the two bridgehead atoms). A spirocyclic group is a ring system consisting of multiple (e.g., two, three, or more) rings, wherein at least two rings are heterocyclic groups bonded to each other by sharing a single carbon atom. The nitrogen, carbon, or sulfur atom in the heterocyclic group may optionally be oxidized, and the nitrogen atom may optionally be quaternized. The heterocyclic group may be connected to the rest of the molecule via a carbon atom or a heteroatom and by a single bond. In some cases, the heterocyclic group may be carbon-linked, nitrogen-linked, or sulfur-linked. In some embodiments, the heterocyclic group is carbon-linked. In some embodiments, the heterocyclic group is nitrogen-linked. In some embodiments, the heterocyclic group is sulfur-linked. Unless otherwise specifically specified in this specification, the heterocyclic group may optionally be substituted.

[0065] Heterocyclic groups also include groups in which the heterocyclic group is fused with a saturated, partially unsaturated, or fully unsaturated (i.e., aromatic) cyclic hydrocarbon group, aryl, heterocyclic group, or heteroaryl group. In heterocyclic groups containing fused rings, one or more rings may be aryl or heteroaryl as defined below. Examples of fused heterocyclic groups include, but are not limited to, phenyl-fused heterocyclic groups or pyridyl-fused heterocyclic groups, as well as quinolinyl, isoquinolinyl, quinoxalinyl, quinazinyl, quinazolinyl, azidoindolazinyl, pteridinyl, chromenyl, isochromenyl, indolyl, isoindolyl, indolazinyl, indazole, purine, benzofuranyl, isobenzofuranyl, benzoimidazolyl, benzothiophene, benzothiazolyl, carbazolyl, phenazinyl, phenthiazolyl, phenanthidyl, imidazo[1,2-a]pyridinyl, [1,2,4]triazo[4,3-a]pyridinyl, and [1,2,3]triazo[4,3-a]pyridinyl fused heterocyclic groups, etc.

[0066] In some embodiments, the heterocyclic group is a stable non-aromatic monocyclic, bicyclic, tricyclic or more cyclic group (including fused, bridged or spirocyclic groups) containing 1 to 3 heteroatoms selected from nitrogen, oxygen and sulfur, such as a stable 5 to 10 (e.g. 4 to 9) non-aromatic monocyclic, bicyclic, tricyclic or more cyclic group (including fused, bridged or spirocyclic groups) containing 1 to 3 heteroatoms selected from nitrogen, oxygen and sulfur. Examples of heterocyclic groups include, but are not limited to: pyrrolidinyl, morpholinyl, piperazinyl, homopiperazinyl, piperidinyl, thiomorpholinyl, 2,7-diaza-spiro[3.5]nonane-7-yl, 2-oxa-6-aza-spiro[3.3]heptane-6-yl, 2-oxa-6-aza-spiro[3.4]octane-7-yl, 8-oxa-2-aza-spiro[4.5]decane-6-yl, 2,5-diaza-bicyclo[2.2.1]heptane-2-yl, azacyclobutane, oxacyclobutane, thiocyclobutane, thiocyclobutane, thiocyclobutane Cyclopentyl, pyranyl, tetrahydropyranyl, thiaranyl, tetrahydrofuranyl, oxazinyl, dioxocyclopentyl, tetrahydroisoquinolinyl, decahydroisoquinolinyl, imidazolinyl, imidazoalkyl, quinazinyl, thiazoalkyl, isothiazolinyl, isoxazolinyl, dihydroindolyl, octahydroindolyl, octahydroisoindolyl, pyrazolyl, phthalimide, dioxothiomorpholinyl, dioxothiocyclopentyl, dioxothiocyclobutyl, thiocyclohexyl, dioxothiocyclohexyl, thiomorpholinyl, 1,4-oxothiocyclohexyl, etc.

[0067] As used herein, "alkoxy" refers to alkyl-O-, and the definition of alkyl is as described above. Preferred alkoxy groups are C1-C20 alkoxy groups, such as C1-C16 alkoxy, C1-C10 alkoxy, C1-C8 alkoxy, C1-C6 alkoxy, and C1-C4 alkoxy groups, including, for example, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, tert-butoxy, sec-butoxy, n-pentoxy, n-hexoxy, 1,2-dimethylbutoxy, etc.

[0068] As used in this article, "alkylthio" refers to alkyl-S-, and the definition of alkyl is as described above.

[0069] As used herein, "halogenated" or "halogen" refers to elements in Group 17 with atomic numbers 9 to 85. "Halogen" or "halogen atom" refers to F, Cl, Br, and I. "Halogenated" means substituted by an atom selected from F, Cl, Br, and I.

[0070] As used in this article, "amino" refers to -NH2.

[0071] As used in this article, "carboxyl group" refers to -COOH.

[0072] As used in this article, "nitro" refers to -NO2.

[0073] As used in this article, "hydroxyl group" refers to -OH.

[0074] As used in this article, "cyano" refers to -CN.

[0075] As used herein, "aryl" refers to an unsaturated aromatic carbocyclic monovalent group having a single ring (e.g., phenyl) or multiple fused rings (e.g., naphthyl or anthracene), wherein the fused rings may or may not be aromatic. In one variation, the aryl group comprises 6 to 14 cyclic carbon atoms ("C6-C14 aryl"), preferably C6-C10 aryl. Aryl groups having more than one ring, wherein at least one ring is non-aromatic, may be attached to the parent structure at an aromatic ring position or at a non-aromatic ring position. Examples of aryl groups include phenyl, fluorenyl, naphthyl, phenanthryl, anthracene, indene, azulel, biphenyl, biphenylene, and genus.

[0076] As used herein, "heteroaryl" refers to a monovalent group containing 5-14, preferably 5-10, ring atoms, and having 6, 10, or 14 π electrons shared in the ring system. The ring atoms in a heteroaryl group are carbon atoms and 1, 2, 3, or 4 heteroatoms selected from N, O, S, and Se. In this invention, preferred heteroaryl groups are those containing N, S, or O atoms, and more preferably, those containing N or S atoms. Examples of heteroaryl groups include: carbazolyl, triazolyl, thiophene, furanyl, pyranyl, pyrroleyl, imidazolyl, pyrazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, indazinyl, isoindolyl, indolyl, benzimidazolyl, dibenzothiophene, dibenzopyridyl, and pyrazolopyrimidinyl, etc.

[0077] It is well known that substituents have a significant impact on the absorption of conjugated molecules. Based on this, such as... Figure 1 As shown, this invention utilizes DFT calculations to determine a series of substituents that may produce a blue shift in absorption. The results indicate that, based on existing benzotriazole molecules, the fluorine atoms substituted at positions 5 and 6, the trifluoromethyl group, and the methyl group produce a significant blue shift. Among these, when the structures of the other parts of the compound are identical, the benzotriazole molecule with two methyl substituents exhibits the most significant blue shift effect.

[0078] Therefore, this invention designs a novel class of light-converting agents based on benzotriazole compounds. By introducing alkyl (such as methyl) and cycloalkyl groups into existing benzotriazole molecules, the absorption range of these molecules is broadened to the maximum extent, enabling them to absorb shorter wavelengths. At the same time, while adjusting the absorption range of the light-converting agent molecules, the amount of light-converting agent molecules added to the light-converting film can be reduced, achieving effective ultraviolet shielding.

[0079] This invention provides a compound of formula I:

[0080]

[0081] R1 is selected from substituted or unsubstituted C1-C10 alkyl groups and substituted or unsubstituted C3-C10 cycloalkyl groups;

[0082] R2 is selected from substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C2-C10 alkenyl, substituted or unsubstituted C2-C10 alkynyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C10 alkylthio, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted 3-14 membered heterocyclic, substituted or unsubstituted C6-C14 aryl, substituted or unsubstituted 5-14 membered heteroaryl, substituted or unsubstituted amino, halogen, cyano, nitro, hydroxyl, carboxyl, azide and -CO-(C1-C10 alkyl);

[0083] Ar is selected from substituted or unsubstituted C6-C14 aryl groups and substituted or unsubstituted 5-14 heteroaryl groups;

[0084] The 3-14 membered heterocyclic group and the 5-14 membered heteroaryl group each independently include 1, 2 or 3 heteroatoms selected from N, O and S;

[0085] The halogen is F, Cl, Br or I.

[0086] In some embodiments, the substituents on the C1-C10 alkyl group that replaces R2 are one, two, or three C1-C10 alkoxy groups.

[0087] In some embodiments, in the substituted or unsubstituted C1-C20 alkyl group as R2, the C atom directly bonded to the nitrogen atom of benzotriazole is carbon number 1, and the carbon atom bonded to carbon number 1 in the substituted or unsubstituted C1-C20 alkyl group as R2 is a tertiary carbon; preferably, carbon number 1 is a primary carbon. In other embodiments, in the substituted or unsubstituted C1-C20 alkyl group as R2, the C atom directly bonded to the nitrogen atom of benzotriazole is a tertiary carbon.

[0088] In some embodiments, the substituents on the substituted C6-C14 aryl group or the substituted 5-14 heteroaryl group of Ar are 1, 2, 3 or 4 selected from -NR. a R b Substituents such as C1-C10 alkyl, NC-(C1-C10 alkylene)-, C1-C10 alkoxy, C6-C14 aryl, -CO-(C6-C14 aryl) and 5-14 heteroaryl groups having 1, 2 or 3 heteroatoms selected from N, O and S, R a and R b Each is independently selected from hydrogen, C1-C10 alkyl and C6-C14 aryl.

[0089] In some embodiments, R1 is selected from unsubstituted C1-C10 alkyl and unsubstituted C3-C10 cycloalkyl; preferably, R1 is selected from unsubstituted C1-C10 alkyl.

[0090] In some embodiments, R2 is selected from carboxyl, amino, -NH(C1-C10 alkyl), -N(C1-C10 alkyl)2, -CO-(C1-C10 alkyl), C3-C10 cycloalkyl, 5-14 membered heterocyclic group having 1, 2 or 3 heteroatoms selected from N, O and S, C6-C14 aryl, 5-14 membered heteroaryl group having 1, 2 or 3 heteroatoms selected from N, O and S, C1-C10 alkoxy, C2-C10 alkenyl, substituted C1-C10 alkyl and unsubstituted C1-C10 alkyl, wherein the substituents on the substituted C1-C10 alkyl group of R2 are 1, 2 or 3 C1-C6 alkoxy groups. Preferably, R2 is selected from C6-C14 aryl, 5-7 membered heteroaryl having 1, 2 or 3 heteroatoms selected from N, O and S, C1-C10 alkoxy, substituted C1-C10 alkyl, and unsubstituted C1-C10 alkyl, wherein the substituent of the substituted C1-C10 alkyl of R2 is C1-C6 alkoxy. Preferably, R2 is an unsubstituted C1-C10 alkyl.

[0091] In some implementations, R2 is selected from:

[0092]

[0093] Where * represents the site where R2 is connected to other parts of the compound of formula I.

[0094] In some embodiments, the substituents on the substituted C6-C14 aryl group or the substituted 5-14 heteroaryl group of Ar are 1, 2, 3 or 4 selected from -NR. a R b C1-C6 alkyl, NC-(C1-C6 alkylene)-, C1-C6 alkoxy, C6-C14 aryl, -CO-(C6-C14 aryl) and substituents having 1, 2 or 3 heteroatoms selected from N, O and S, R a and R b Each is independently selected from C6-C14 aryl groups.

[0095] Preferably, Ar is an unsubstituted or substituted C6-C14 aryl group, or a substituted or unsubstituted 5-14 membered heteroaryl group having 1, 2, or 3 N, O, and S atoms. The substituents on the substituted C6-C14 aryl group of Ar are preferably 1, 2, 3, or 4 selected from -NR. a R b Substituents of C1-C6 alkyl groups, R a and R b Each alkyl group is independently selected from C6-C14 aryl groups. Preferably, Ar is an unsubstituted fluorenyl group, a fluorenyl group substituted with one or two C1-C6 alkyl groups, an unsubstituted phenyl group, or a fluorenyl group substituted with one, two, or three alkyl groups selected from -NR. a Rb Phenyl groups substituted with C1-C6 alkyl groups, R a and R b Each is independently selected from C6-C14 aryl groups.

[0096] Preferably, the substituent of the phenyl group substituted for Ar is in a para-position relative to the other parts of the compound; and / or, the substituent of the fluorenyl group substituted for Ar is located on the non-aromatic ring of the substituted fluorenyl group.

[0097] In some implementation schemes, Ar is selected from:

[0098]

[0099] Where * represents the site where Ar is connected to other parts of the compound of formula I.

[0100] In some embodiments, the compound of formula I is selected from:

[0101]

[0102] The present invention also provides the use of the compound of formula I as a light-converting agent. In some embodiments, the quantum yield of the compound of formula I is above 92%, for example 92-93%.

[0103] This invention also provides a light-converting film comprising a matrix resin and a compound of Formula I of this invention. The matrix resin may be selected from resins commonly used in the field of light-converting films. In some embodiments, the matrix resin is selected from one or more of POE (an elastomer obtained by random copolymerization of ethylene and α-olefins), EVA (ethylene-vinyl acetate copolymer), EPE (a three-layer structure of EVA+POE+EVA), PVB (polyvinyl butyral), and silicone. In some embodiments, the mass ratio of the compound of Formula I to the matrix resin is (1-20):1000, for example (1-10):1000, (1-5):1000, (1-2):1000, or (1-1.5):1000.

[0104] In some embodiments, the absorption wavelength of the light-converting film of the present invention is above 300 nm. The light-converting agent of this application can broaden the minimum absorption wavelength of the light-converting film to around 300 nm.

[0105] The present invention also provides a solar cell comprising the light conversion film of the present invention. In some embodiments, the solar cell of the present invention is selected from tunneling oxide passivation cells (TOPCon) and back contact cells (BC).

[0106] The present invention also provides a method for preparing the light-converting film of the present invention, the method comprising mixing a mixture of a matrix resin and a compound of formula I of the present invention. In some embodiments, the mixing temperature is 100±20°C and the mixing time is 10±2 min.

[0107] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. Percentages and parts are by weight unless otherwise stated.

[0108] Preparation Example 1

[0109] The synthetic routes for all structures are performed according to the following general synthetic steps:

[0110]

[0111] first step:

[0112] At room temperature, 100 mmol of 4,5-diR1-phenylenediamine was dissolved in 50 mL of acetic acid, and then 150 mmol of sodium nitrite solution dissolved in 10 mL of deionized water was added to the reaction system. After stirring at room temperature for 2 hours, the mixture was filtered, and the filter cake was washed with plenty of deionized water. The collected filter cake was the target product.

[0113] Step Two:

[0114] Under an inert atmosphere, 100 mol of 5,6-diR1-2H-benzo[d][1,2,3]triazole, 120 mmol of the halogenated (chloro, bromine, iodine) derivative of R2, and 300 mmol of potassium carbonate were added to 200 mL of dimethylformamide. The reaction mixture was heated and stirred at 40 °C for 24 hours under an inert atmosphere, then poured into ice water and stirred for 30 min. Extraction was then performed with sufficient dichloromethane, dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. The final product was purified by column chromatography.

[0115] Step 3:

[0116] 0.1 mol of the product obtained in step two was dissolved in 50 mL of acetic acid. Then, 0.25 mol of N-succinimide bromide was added in portions under ice bath conditions, and the mixture was heated to reflux for 6 h. After the reaction was completed, the reaction system was allowed to cool to room temperature, then poured into a saturated sodium bisulfite solution and stirred for 30 min. The mixture was then extracted with excess dichloromethane, dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. Finally, the product was purified by column chromatography to obtain the target product.

[0117] Step 4:

[0118] Under an inert atmosphere, 0.1 mol of 4,7-dibromo-5,6-diR1-2H-benzo[d][1,2,3]triazole substituted with R2 and 0.25 mol of Arylboronic acid were dissolved in 100 mL of toluene. 20 mmol of tetrakis(triphenylphosphine)palladium(0), 0.2 mol of sodium carbonate and 10 mL of deionized water were added. The mixture was heated to 120 °C and refluxed for 24 hours. After cooling to room temperature, 200 mL of water was added to the reaction flask to quench the reaction. The mixture was extracted three times with dichloromethane, dried over anhydrous magnesium sulfate, and the solvent was evaporated. The target product was purified by column chromatography to obtain the optically converting molecule.

[0119] Preparation Example 2

[0120] The preparation process of the light conversion film involved in all embodiments and comparative examples is as follows:

[0121] The base resin and the light-converting agent were simultaneously added to a mixer (100°C, 10 min) in the ratio mentioned in the examples (light-converting agent: base resin ≥ 1:1000) to obtain the final light-converting film.

[0122] Example 1

[0123] Synthesize the following molecules:

[0124]

[0125] This molecule was synthesized following the general synthetic steps outlined above. 1 ¹H NMR (400MHz, deuterated chloroform) δ = 7.40 (d, J = 7.5Hz, 2H), 7.3 (d, J = 7.5Hz, 2H), 4.41 (d, J = 7.3Hz, 2H), 2.55–2.45 (m, 1H), 2.40 (s, 6H), 1.30 (s, 18H), 0.88 (d, J = 7.2Hz, 6H). MALDI-TOF result: 467.7.

[0126] The prepared light-converting agent was mixed with EVA matrix resin at a mass ratio of 1.5:1000 in a Banbury mixer to prepare a light-converting film. After lamination, the maximum absorption wavelength of the light-converting film was measured to be 300 nm using a UV spectrophotometer, and the maximum emission wavelength was measured to be 410 nm using a fluorescence spectrometer. The quantum yield of the light-converting film was 93%. The transmittance of the light-converting film at 0.45 mm was measured using a fiber optic spectrometer. The transmittance below 340 nm was almost 0, and the transmittance in the 280-340 nm range was 1.1%.

[0127] Example 2

[0128] Synthesize the following molecules:

[0129]

[0130] This molecule was synthesized following the general synthetic steps outlined above. 1 ¹H NMR (400MHz, deuterated chloroform) δ = 7.43 (d, J = 7.5Hz, 4H), 7.38–7.30 (m, 8H), 7.28–7.20 (m, 12H), 7.12 (t, J = 7.8Hz, 4H), 4.41 (d, J = 7.3Hz, 2H), 2.55–2.45 (m, 1H), 2.40 (s, 6H), 0.88 (d, J = 7.2Hz, 6H). MALDI-TOF result: 689.9.

[0131] The prepared light-converting agent was mixed with EVA matrix resin at a mass ratio of 1.5:1000 in a Banbury mixer to obtain a light-converting film. After lamination, the maximum absorption wavelength of the light-converting film was measured to be 343 nm using a UV spectrophotometer, and the maximum emission wavelength was measured to be 440 nm using a fluorescence spectrometer. The quantum yield of the light-converting film was 92%. The transmittance of the light-converting film at 0.45 mm was measured using a fiber optic spectrometer. The transmittance below 380 nm was almost 0, and the transmittance in the 280-380 nm range was 1.0%.

[0132] Example 3

[0133] Synthesize the following molecules:

[0134]

[0135] This molecule was synthesized following the general synthetic steps outlined above. 1 ¹H NMR (400MHz, deuterated chloroform) δ = 8.09 (d, J = 7.2Hz, 2H), 7.93–7.85 (m, 4H), 7.78 (d, J = 7.4Hz, 2H), 7.55 (d, J = 7.0Hz, 2H), 7.38 (t, J = 7.7Hz, 2H), 7.28 (t, J = 7.7Hz, 2H), 2.40 (s, 6H), 1.69 (s, 12H), 1.45 (s, 9H). MALDI-TOF result was 587.8.

[0136] The prepared light-converting agent was mixed with POE matrix resin at a mass ratio of 1:1000 in a Banbury mixer to prepare a light-converting film. After lamination, the maximum absorption wavelength of the light-converting film was measured to be 330 nm using a UV spectrophotometer, and the maximum emission wavelength was measured to be 425 nm using a fluorescence spectrometer. The quantum yield of the light-converting film was 93%. The transmittance of the light-converting film at 0.45 mm was measured using a fiber optic spectrometer. The transmittance below 360 nm was almost 0, and the transmittance between 280 and 360 nm was 1.2%.

[0137] Comparative Example 1

[0138]

[0139] This molecule was synthesized according to the general synthetic procedure (R1 in the raw materials is hydrogen), and the other procedures for preparing the light-converting film were consistent with those in Example 1. The light-converting agent was mixed with EVA matrix resin at a mass ratio of 1.5:1000 in a Banbury mixer to obtain the light-converting film. After lamination, the maximum absorption wavelength of the light-converting film was measured to be 345 nm using a UV spectrophotometer, and the maximum emission wavelength was measured to be 420 nm using a fluorescence spectrometer. The quantum yield of the light-converting film was 91%. The transmittance of the light-converting film at 0.45 mm was measured using a fiber optic spectrometer, and the transmittance in the 280-380 nm range was 9.3%.

[0140] Comparative Example 2

[0141]

[0142] This molecule was synthesized according to the general synthetic procedure (R1 in the raw materials is hydrogen), and the other procedures for preparing the light-converting film were consistent with those in Example 2. The light-converting agent was mixed with EVA matrix resin at a mass ratio of 1.5:1000 in a Banbury mixer to obtain the light-converting film. After lamination, the maximum absorption wavelength of the light-converting film was measured to be 400 nm using a UV spectrophotometer, and the maximum emission wavelength was measured to be 500 nm using a fluorescence spectrometer. The quantum yield of the light-converting film was 90%. The transmittance of the light-converting film at 0.45 mm was measured using a fiber optic spectrometer, and the transmittance in the 280-380 nm range was 8.2%.

[0143] Test case

[0144] The test method for the absorption wavelength of the light transfer film in all embodiments and comparative examples is as follows: after lamination using a laminator (150°C, 600s), the film is tested using a UV spectrophotometer.

[0145] The emission wavelength and quantum yield of the transfer film in all embodiments and comparative examples were tested using a laminator (150°C, 600s) and then measured using an Edinburgh FLS1000 fluorescence spectrometer.

[0146] In all embodiments and comparative examples, the transmittance was tested using the following method: after lamination with a laminator (150°C, 600s), the transmittance at a thickness of 0.45mm of the light-converting film was tested using a fiber optic spectrometer.

[0147] The test results are shown in Table 1.

[0148] Table 1

[0149]

[0150] It should be noted that it is relatively easy to prepare molecules with a red-shifted absorption wavelength; simply making the conjugated system of the light-converting agent molecule large enough is sufficient to achieve a red-shift in molecular absorption. Those skilled in the art know that as battery efficiency improves, tolerance to short-wavelength light gradually decreases. With the continuous development of TOPCon and BC battery technologies, these two technologies have a high response to short wavelengths. This means that if too many short wavelengths are blocked, it will cause a significant power loss. Therefore, achieving shielding at shorter wavelengths is crucial for future battery development. Compared to benzotriazole without any groups attached to positions 5 and 6, when alkyl or cycloalkyl groups are attached to positions 5 and 6 of benzotriazole, the steric hindrance and electronic effects of the alkyl or cycloalkyl groups cause a blue shift in the absorption of the entire light-converting agent molecule, thereby broadening the spectral absorption range of the entire molecular series while maintaining luminescence intensity. On the other hand, the peaks in the molecular absorption spectrum at long wavelengths generally represent the absorption peaks of the molecule itself, while the peaks at short wavelengths represent the absorption peaks of certain segments within the conjugated molecule. Therefore, when non-conjugated substituents are introduced, the peaks at short wavelengths do not show a significant shift. The introduction of alkyl or cycloalkyl groups results in the most significant blue shift of the molecular absorption peaks, particularly at longer wavelengths. This reduces the shift between the two absorption peaks of the light-converting agent molecule, meaning that the absorbance at the junction of the two peaks increases. Consequently, light-converting films containing dialkyl or cycloalkyl-substituted benzotriazole light-converting agents exhibit better short-wavelength shielding at the same dosage. In other words, to achieve excellent short-wavelength shielding for a light-converting film made with a specific light-converting agent, the dosage of dialkyl or cycloalkyl-substituted benzotriazole light-converting agents is minimized, effectively reducing costs in photovoltaic applications.

Claims

1. Compound of Formula I: R1 is selected from substituted or unsubstituted C1-C10 alkyl groups and substituted or unsubstituted C3-C10 cycloalkyl groups; R2 is selected from substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C2-C10 alkenyl, substituted or unsubstituted C2-C10 alkynyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C10 alkylthio, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted 3-14 membered heterocyclic, substituted or unsubstituted C6-C14 aryl, substituted or unsubstituted 5-14 membered heteroaryl, substituted or unsubstituted amino, halogen, cyano, nitro, hydroxyl, carboxyl, azide and -CO-(C1-C10 alkyl); Ar is selected from substituted or unsubstituted C6-C14 aryl groups and substituted or unsubstituted 5-14 heteroaryl groups; The 3-14 membered heterocyclic group and the 5-14 membered heteroaryl group each independently include 1, 2 or 3 heteroatoms selected from N, O and S; The halogen is F, Cl, Br or I.

2. The compound of formula I as claimed in claim 1, characterized in that: The substituents on the C1-C10 alkyl group that replaces R2 are 1, 2 or 3 C1-C10 alkoxy groups; In the substituted or unsubstituted C1-C20 alkyl groups of R2, the C atom directly bonded to the nitrogen atom of benzotriazole is carbon number 1, and the carbon atom bonded to carbon number 1 in the substituted or unsubstituted C1-C20 alkyl groups of R2 is a tertiary carbon; or, in the substituted or unsubstituted C1-C20 alkyl groups of R2, the C atom directly bonded to the nitrogen atom of benzotriazole is a tertiary carbon. The substituents on the C6-C14 aryl group or the substituted 5-14 heteroaryl group, which are substituted for Ar, are 1, 2, 3 or 4 selected from -NR. a R b Substituents such as C1-C10 alkyl, NC-(C1-C10 alkylene)-, C1-C10 alkoxy, C6-C14 aryl, -CO-(C6-C14 aryl) and 5-14 heteroaryl groups having 1, 2 or 3 heteroatoms selected from N, O and S, R a and R b Each is independently selected from hydrogen, C1-C10 alkyl and C6-C14 aryl.

3. The compound of formula I as claimed in claim 1, characterized in that, R1 is selected from unsubstituted C1-C6 alkyl and unsubstituted C3-C8 cycloalkyl; preferably, R1 is selected from unsubstituted C1-C4 alkyl.

4. The compound of formula I as claimed in claim 1, characterized in that, R2 is selected from carboxyl, amino, -NH(C1-C10 alkyl), -N(C1-C10 alkyl)2, -CO-(C1-C10 alkyl), C3-C10 cycloalkyl, 5-14 membered heterocyclic group having 1, 2 or 3 heteroatoms selected from N, O and S, C6-C14 aryl, 5-14 membered heteroaryl group having 1, 2 or 3 heteroatoms selected from N, O and S, C1-C10 alkoxy, C2-C10 alkenyl, substituted C1-C10 alkyl and unsubstituted C1-C10 alkyl, wherein the substituents on the substituted C1-C10 alkyl group of R2 are 1, 2 or 3 C1-C6 alkoxy groups; Preferably, R2 is selected from C6-C14 aryl, 5-7 membered heteroaryl having 1, 2 or 3 heteroatoms selected from N, O and S, C1-C10 alkoxy, substituted C1-C10 alkyl and unsubstituted C1-C10 alkyl, wherein the substituent of the substituted C1-C10 alkyl of R2 is C1-C6 alkoxy. Preferably, R2 is an unsubstituted C1-C10 alkyl group; Preferably, R2 is selected from: Where * represents the site where R2 is connected to other parts of the compound of formula I.

5. The compound of formula I as claimed in claim 1, characterized in that, The substituents on the C6-C14 aryl group or the substituted 5-14 heteroaryl group, which are substituted for Ar, are 1, 2, 3 or 4 selected from -NR. a R b C1-C6 alkyl, NC-(C1-C6 alkylene)-, C1-C6 alkoxy, C6-C14 aryl, -CO-(C6-C14 aryl) and substituents having 1, 2 or 3 heteroatoms selected from N, O and S, R a and R b Each is independently selected from C6-C14 aryl groups; Preferably, Ar is a substituted or unsubstituted C6-C14 aryl group, or a substituted or unsubstituted 5-14 membered heteroaryl group having 1, 2, or 3 N, O, and S atoms, wherein the substituents on the substituted C6-C14 aryl group of Ar are 1, 2, 3, or 4 selected from -NR. a R b Substituents of C1-C6 alkyl groups, R a and R b Each is independently selected from C6-C14 aryl groups; Preferably, Ar is an unsubstituted fluorenyl group, a fluorenyl group substituted with one or two C1-C6 alkyl groups, an unsubstituted phenyl group, or a fluorenyl group substituted with one, two, or three alkyl groups selected from -NR. a R b Phenyl groups substituted with C1-C6 alkyl groups, R a and R b Each is independently selected from C6-C14 aryl groups; Preferably, the substituent of the phenyl group substituted for Ar is in a para-position relative to the other parts of the compound; and / or, the substituent of the fluorenyl group substituted for Ar is located on the non-aromatic ring of the substituted fluorenyl group; Preferably, Ar is selected from: Where * represents the site where Ar is connected to other parts of the compound of formula I.

6. The compound of formula I as claimed in claim 1, characterized in that, The compound of formula I is selected from:

7. Use of the compound of formula I according to any one of claims 1-6 as a light-converting agent.

8. A light-converting film, characterized in that, The light-converting film comprises a matrix resin and a compound of formula I according to any one of claims 1-6.

9. The light-converting film as described in claim 8, characterized in that, The matrix resin is selected from one or more of POE, EVA, EPE, PVB and silicone; and / or, the mass ratio of the compound of formula I to the matrix resin is (1-20):1000, preferably (1-1.5):1000.

10. A solar cell, characterized in that, The solar cell includes the light-converting film as described in claim 8 or 9; preferably, the solar cell is selected from tunneling oxide passivation cells and back contact cells.

Images