Method for characterizing optical performance of light conversion film and method for measuring light conversion agent in light conversion film

Abstract

The application relates to the technical field of light conversion film testing, in particular to a light conversion film optical performance characterization method and a light conversion agent determination method in a light conversion film. The light conversion film optical performance characterization method comprises the following operations: providing a light conversion film, testing the light conversion film by using a fiber spectrometer to obtain a light transmittance-wavelength test curve of the light conversion film; and obtaining a maximum absorption peak and a corresponding light transmittance, a maximum emission peak and a corresponding light transmittance and the light transmittance of each wavelength based on the light transmittance-wavelength test curve. The application embodiment can obtain accurate light transmittance of each wavelength.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light conversion film testing, and particularly relates to a method for characterizing optical performance of a light conversion film and a method for determining a light conversion agent in the light conversion film. BACKGROUND

[0002] With the continuous development of solar cell technology, heterojunction cells (HJT cells) are attracting much attention in the photovoltaic market due to their higher photoelectric conversion efficiency and lower photovoltaic energy loss. However, the silicon-hydrogen bond in the amorphous or microcrystalline silicon passivation layer in the HJT cell is easily broken by the energy of ultraviolet light, thereby causing the efficiency of the cell to decay. Based on this, a light conversion film is introduced to convert part of the ultraviolet light into visible light, thereby reducing the negative impact of ultraviolet light on the photovoltaic cell.

[0003] It is difficult to distinguish the ultraviolet light transmittance from the converted light in the ultraviolet region by using an ultraviolet spectrophotometer, which makes it impossible to accurately evaluate the actual optical performance of the light conversion film.

[0004] It should be noted that the above content is not necessarily prior art, and is not used to limit the patent protection scope of the present application. SUMMARY

[0005] The embodiments of the present application provide a method for characterizing optical performance of a light conversion film and a method for determining a light conversion agent in the light conversion film, so as to solve or alleviate one or more technical problems proposed above.

[0006] As a first aspect of the embodiments of the present application, the embodiments of the present application provide a method for characterizing optical performance of a light conversion film. The method for characterizing optical performance of the light conversion film comprises the following operations:

[0007] providing a light conversion film, and testing the light conversion film by using a fiber spectrometer to obtain a transmittance-wavelength test curve of the light conversion film;

[0008] obtaining a maximum absorption peak and a corresponding transmittance, a maximum emission peak and a corresponding transmittance, and a transmittance of each wavelength based on the transmittance-wavelength test curve.

[0009] In the first aspect of the embodiments of the present application, the fiber spectrometer is used to test the light conversion film. When testing, full-spectrum light will be incident on the light conversion film, and the transmittance is collected according to different wavelengths instead of collecting all the transmitted light, so that the test results can effectively distinguish the light conversion effect and the transmittance of ultraviolet light. The data in the test curve can accurately characterize the transmittance of each wavelength, and the obtained maximum absorption peak and corresponding transmittance, maximum emission peak and corresponding transmittance can represent the real absorption and emission of the light conversion film.

[0010] As a second aspect of the embodiments of the present application, the embodiments of the present application provide a method for determining a light conversion agent in a light conversion film. The method for determining the light conversion agent in the light conversion film comprises the following operations:

[0011] A plurality of groups of light conversion films are provided, and the plurality of groups of light conversion films are tested by using a fiber spectrometer to obtain a light transmittance-wavelength test curve of the plurality of groups of light conversion films.

[0012] Based on the light transmittance-wavelength test curve of the plurality of groups of light conversion films, content and light transmittance data of a plurality of groups of the light conversion agent at a preset wavelength are obtained.

[0013] Based on the content and light transmittance data of the plurality of groups of the light conversion agent, fitting is performed to obtain a fitting curve at the preset wavelength.

[0014] The plurality of groups of light conversion films are light conversion films containing the same kind of light conversion agent but different contents.

[0015] The second aspect of the embodiments of the present application can determine the content of the light conversion agent in the light conversion film according to the obtained fitting curve. After the fitting curve is obtained, the light transmittance of the light conversion film at the wavelength is determined, and the content of the light conversion agent in the light conversion film can be quickly obtained by using the fitting curve. In addition, the amount of the light conversion agent added in the light conversion film can be determined according to the fitting curve, thereby guiding the production of subsequent light conversion films. BRIEF DESCRIPTION OF DRAWINGS

[0016] In the drawings, like reference numerals refer to like elements throughout the various drawings. The drawings are not necessarily to scale, the emphasis instead being placed upon illustrating principles of the application. It should be understood that the drawings are merely depictions of some embodiments of the application and that no limitations of the scope of the application are intended to be implied therefrom.

[0017] Figure 1 is a light transmittance-wavelength test curve provided by Embodiment 1;

[0018] Figure 2 is a light transmittance-wavelength test curve of a plurality of groups of light conversion films and a blank control group provided by Embodiment 2;

[0019] Figure 3 is an ultraviolet absorption curve of a light conversion agent molecular solution of Embodiment 2;

[0020] Figure 4 is a fitting curve of Embodiments 2-9;

[0021] Figure 5 is a partial enlarged view of Figure 4 ;

[0022] Figure 6 is another partial enlarged view of Figure 4 ; DETAILED DESCRIPTION

[0023] In order to make the purposes, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the terms “first”, “second”, and the like in the specification of the present application, the claims, and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the terms thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms “include” and “have” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device including a series of steps or units does not necessarily have to include only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product, or device.

[0025] In the present application, when referring to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional values in the numerical interval is considered to be continuous, and includes both numerical end points (i.e., the minimum value and the maximum value) of the numerical interval and every value between the two numerical end points. Unless otherwise specified, when a numerical interval refers only to integers within the numerical interval, including both end point integers of the numerical range and every integer between the two end points, it is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe a feature or characteristic, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed in the present application should be understood to include any and all sub-ranges included therein. The “numerical value” in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The “numerical interval” is intended to broadly include quantitative intervals such as percentage intervals, ratio intervals, and value intervals.

[0026] For the test of light conversion film, the related art uses ultraviolet spectrophotometer or fluorescence spectrometer. Both have the following problems: the test principle of the ultraviolet spectrophotometer is to gradually increase the test waveband from short wavelength to long wavelength at a certain step rate, and collect all the light passing through the sample after passing through the test sample by using an integrating sphere. When the ultraviolet light of short wavelength passes through the light conversion film, the light conversion film emits light of other colors, which causes the integrating sphere to collect the ultraviolet light passing through the light conversion film and the light of other wavelengths converted by the light conversion film at the same time when testing the light transmittance of the light conversion film, so that the actual measured light transmittance represents the light transmittance in the ultraviolet region and the light transmittance of conversion, and the two cannot be distinguished. The quantum yield of the light conversion film is greatly affected by the thickness of the light conversion film, and the consistency of the thickness of the light conversion film is difficult to guarantee, which leads to difficulty in evaluating the light conversion performance of different films in comparison.

[0027] The embodiment of the present application provides a method for characterizing the optical performance of a light conversion film and a method for determining the light conversion agent in the light conversion film. Based on this, the optical performance of the light conversion film can be accurately characterized. See the following.

[0028] In the following, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. It should be noted that these exemplary embodiments can be implemented in various different forms and should not be construed as being limited to the embodiments set forth herein.

[0029] The first aspect of the embodiment of the present application provides a method for characterizing the optical performance of a light conversion film.

[0030] In some embodiments, the method for characterizing the optical performance of a light conversion film includes the following operations:

[0031] A light conversion film is provided, and a fiber spectrometer is used to test the light conversion film to obtain a light transmittance-wavelength test curve of the light conversion film.

[0032] Based on the light transmittance-wavelength test curve, the maximum absorption peak and the corresponding light transmittance, the maximum emission peak and the corresponding light transmittance, and the light transmittance of each wavelength are obtained.

[0033] In the first aspect of the embodiment of the present application, the fiber spectrometer is used to test the light conversion film. When testing, the full spectrum of light will hit the light conversion film, and the light transmittance is collected according to different wavelengths instead of collecting all the transmitted light, so that the test results can effectively distinguish the conversion effect and the transmittance of ultraviolet light. The data in the test curve can accurately characterize the light transmittance of each wavelength, and the maximum absorption peak and the corresponding light transmittance, the maximum emission peak and the corresponding light transmittance can represent the real absorption and emission of the light conversion film. The change of the maximum absorption peak and the maximum emission peak light transmittance can represent whether the light transmittance of the light conversion film reaches the preset target.

[0034] It is worth noting that when testing the light transfer film using a fiber optic spectrometer, the area of ​​the light transfer film can be 1 cm². 2 ~9cm 2 For example, 1cm 2 3cm 2 9cm 2 The thickness of the light-converting film is less than 1 cm, for example, 1 mm, 5 mm, 1 cm, etc. Therefore, the requirements for sample size are relatively broad, sample preparation is convenient, and measurement is easy.

[0035] In some embodiments, the light-converting film includes at least one of the following: polyolefin elastomer (POE), ethylene-vinyl acetate copolymer (EVA), a laminate of ethylene-vinyl acetate copolymer / polyolefin elastomer / ethylene-vinyl acetate copolymer (EPE), polyvinyl butyral (PVB), and silicone. The light-converting agent is an organic fluorescent molecule, belonging to down-conversion materials, which absorbs short-wavelength light and converts it into long-wavelength light. When used in photovoltaic light-converting films, it aims to convert ultraviolet light into photoluminescent light, reducing the negative impact of ultraviolet light on photovoltaics. Exemplarily, the light-converting agent may be at least one of B3N, B3N-O, and B3N-F, and the structural formulas of B3N, B3N-O, and B3N-F are shown in Formulas I, II, and III below, respectively.

[0036]

[0037] In some embodiments, the method for characterizing the optical properties of the light-converting film further includes: obtaining the amount of light transmitted in the ultraviolet region based on the transmittance-wavelength test curve. Thus, the amount of ultraviolet light transmitted after passing through the light-converting film can be obtained intuitively.

[0038] In some embodiments, the transmittance-wavelength test curve of the optical transfer film is measured using a fiber optic spectrometer, as shown in the figure. Figure 1 ,Depend on Figure 1 It can be seen that the maximum absorption peak is around 340nm, while the maximum emission peak is around 420nm. Furthermore, the 280nm to 400nm region on the transmittance-wavelength test curve represents ultraviolet light. The transmittance in this band can be integrated to obtain the amount of ultraviolet light transmitted, providing a direct visual representation of the ultraviolet light transmittance.

[0039] In some embodiments, the method for characterizing the optical properties of the light-converting film further includes the following steps: selecting a filter based on the wavelength of the maximum absorption peak; and testing the light-converting film with the filter using a fiber optic spectrometer to obtain the emission spectrum of the light-converting film. This allows determination of the wavelength range of ultraviolet light absorbed by the light-converting film. Further, the center wavelength of the filter can be (wavelength of the maximum absorption peak ± 2) nm, and the bandwidth of the filter can be 10 nm.

[0040] The second aspect of this application provides a method for determining the light-converting agent in a light-converting film.

[0041] In some embodiments, the method for determining the light-converting agent within the light-converting film includes the following operations:

[0042] Multiple sets of light conversion films are provided, and the multiple sets of light conversion films are tested using a fiber optic spectrometer to obtain the transmittance-wavelength test curves of the multiple sets of light conversion films.

[0043] Based on the transmittance-wavelength test curves of the multiple sets of light conversion films, the content and transmittance data of the multiple sets of light conversion agents at preset wavelengths are obtained.

[0044] Based on the content and transmittance data of the multiple sets of light-converting agents, a fitting curve is obtained at the preset wavelength.

[0045] The multiple sets of light-converting films are light-converting films containing the same type but different amounts of light-converting agents.

[0046] In a second aspect of this application, the amount of light-converting agent in the light-converting film can be quantitatively determined based on the obtained fitted curve. After obtaining the fitted curve, the transmittance of the light-converting film at that wavelength is measured. The content of the light-converting agent in the light-converting film can be quickly obtained using the fitted curve. Furthermore, the amount of light-converting agent added to the light-converting film can be determined based on the fitted curve, guiding the subsequent production of the light-converting film.

[0047] It is understood that, based on the multiple sets of content and transmittance data of the light-converting agent, a fitting curve is obtained at the preset wavelength. That is, the multiple sets of content and transmittance data of the light-converting agent are used as discrete data points to fit a smooth curve. One of the following methods can be used for fitting: least squares method, polynomial fitting, spline interpolation, etc.

[0048] Fiber optic spectrometry can effectively characterize the actual content of the light-converting agent in the light-converting film, which is of great significance for downstream module manufacturers to establish incoming material standards for light-converting films. Theoretically, when the concentration of the light-converting agent reaches a certain level, the maximum absorption peak and the maximum emission peak tend to reach saturation. That is, when the concentration of the light-converting agent exceeds a certain value, the transmittance at these two positions will no longer change. Therefore, the range of light-converting agent concentration that can be determined using the transmittance at these two positions is relatively limited. Generally, the absorption of the light-converting agent has two absorption peaks: one for single molecules and one for aggregated states. The inventors discovered that there is a band with poor absorption capacity between the two absorption peaks of the light-converting agent; the band with the lowest absorbance is the absorption trough of the light-converting agent. Poor absorbance means high transmittance in this band. Light-converting films with different concentrations of light-converting agent show significant differences in transmittance within this wavelength range with the highest transmittance, and higher concentrations of light-converting agent are required to saturate the transmittance at this wavelength.

[0049] Accordingly, in some embodiments, in the method for determining the light-converting agent within the light-converting film, the preset wavelength is (θ-θ1~θ+θ2); where θ is the wavelength of the absorption valley of the light-converting agent; θ1 is 0nm~40nm; and θ2 is 0nm~30nm. Within this preset wavelength, the transmittance is relatively sensitive to changes in content, and the boundary for transmittance to reach saturation with changes in content is relatively wide. That is, within this preset wavelength, the light-converting agent needs to be at a high concentration to achieve transmittance saturation. Therefore, the range for quantitative determination of the light-converting agent within the light-converting film based on the obtained fitting curve is wider, avoiding the situation where the transmittance reaches saturation too early and the corresponding content cannot be determined. Furthermore, determining the amount of light-converting agent added within the light-converting film based on the fitting curve is more accurate.

[0050] In some embodiments, in the method for determining the light-converting agent in the light-converting film, the content of the light-converting agent in each of the multiple groups of light-converting films, based on the mass of the light-converting film, is below 2.0‰. This covers the commonly used light-converting agent content in light-converting films. Optionally, the content of the light-converting agent in the light-converting film is 0.1‰ to 2.0‰, for example, it can be 0.1‰, 0.3‰, 0.5‰, 0.7‰, 0.9‰, 1.2‰, 1.4‰, 1.6‰, 1.8‰, 2.0‰, etc.

[0051] Furthermore, the content of the light-converting agent in the multiple sets of light-converting films is 0.1‰ to 2.0‰.

[0052] Preferably, there are five or more sets of light-converting films. This allows for a more accurate fitting curve to be obtained.

[0053] Further, the method for obtaining the wavelength of the absorption valley of the light-converting agent includes: obtaining the absorbance-wavelength curve of the light-converting agent; and obtaining the wavelength of the absorption valley of the light-converting agent based on the absorbance-wavelength curve. Specifically, the absorbance-wavelength curve of the light-converting agent can be obtained by ultraviolet absorption testing. For example, a 0.01 mg / mL solution of the light-converting agent is prepared using chloroform as a solvent, and the ultraviolet absorption of the solution is measured using an ultraviolet spectrophotometer to obtain the absorbance-wavelength curve of the light-converting agent.

[0054] In some embodiments, in the method for determining the light-converting agent within the light-converting film, the amount of light-converting agent added within the film is determined based on a fitting curve at the preset wavelength. This allows for more accurate guidance on the amount added, avoiding situations where premature transmittance saturation leads to a low indicated amount of light-converting agent, thus affecting the actual effect.

[0055] In some embodiments, in the method for determining the light-converting agent within the light-converting film, the content of the light-converting agent within the film is determined based on a fitting curve at the preset wavelength. This allows for rapid matching of the transmittance at the corresponding wavelength to the fitting curve, minimizing the possibility of the transmittance reaching saturation too early, thus preventing the determination of the corresponding content.

[0056]

Preparation Example

[0057] B3N was used as a light conversion agent, and ethylene-vinyl acetate copolymer (EVA) and the light conversion agent were blended and then laminated.

[0058] After lamination, it is made with a basis weight of 400g / m³. 2 A rectangular light-converting film with a thickness of 1mm and a two-dimensional size of 2cm×2cm;

[0059] Based on the quality of the light-converting film, eight groups of light-converting films with the same type of light-converting agent but different contents were prepared, with the contents of the light-converting agent in the film being 0.1‰, 0.3‰, 0.5‰, 0.7‰, 0.9‰, 1.2‰, 1.4‰, and 1.6‰, respectively. Meanwhile, a blank control group was prepared without any added light-converting agent.

[0060]

Example 1

[0061] The transmittance-wavelength test curves of the light-converting film with a light-converting agent content of 0.9‰ were tested using a fiber optic spectrometer. Figure 1 .

[0062] The fiber optic spectrometer used in the test was purchased from Shanghai Fuxiang Optics Co., Ltd. as a NOVA cooled model.

[0063] Depend on Figure 1It can be seen that the maximum absorption peak is around 340nm, with a corresponding transmittance of 2%, while the maximum emission peak is around 420nm, with a corresponding transmittance of 151%. Furthermore, the 280nm to 400nm region on the transmittance-wavelength test curve represents ultraviolet light. The transmittance in this band can be integrated to obtain the amount of ultraviolet light transmitted, providing a direct visual representation of the ultraviolet light transmittance.

[0064]

Example 2

[0065] S1. Based on the 8 groups of light-converting films and the blank control group obtained from the preparation example, the above 8 groups of light-converting films and the blank control group were tested using a fiber optic spectrometer, and the transmittance-wavelength test curves of the 9 groups of light-converting films were obtained. The results are shown in […]. Figure 2 ;

[0066] S2. A 0.01 mg / mL solution of the light-converting agent (B3N) was prepared using chloroform as the solvent. The UV absorption of the solution was measured using a UV spectrophotometer. The results are shown below. Figure 3 ,from Figure 3 It can be seen that the wavelength of the absorption valley of the optical conversion agent is 297 nm;

[0067] S3. Based on the transmittance-wavelength test curve of the above-mentioned light conversion film, obtain the content and transmittance data of 9 groups of light conversion agents at a wavelength of 297nm.

[0068] S4. Based on the content and transmittance data of the nine groups of light-converting agents, a fitting process was performed to obtain the fitting curves at the corresponding wavelengths, as shown in [the figure]. Figure 4 .

[0069]

Example 3

[0070] The other steps are the same as in Example 2, except that in S3, the content and transmittance data of nine groups of light-converting agents at a wavelength of 257 nm are obtained, and the fitting curves obtained are also shown in [the original text]. Figure 4 .

[0071]

Example 4

[0072] The other steps are the same as in Example 2, except that in S3, the content and transmittance data of nine groups of light-converting agents at a wavelength of 327 nm are obtained, and the fitting curves obtained are also shown in [the original text]. Figure 4 .

[0073]

Example 5

[0074] The other steps are the same as in Example 2, except that in S3, the content and transmittance data of nine groups of light-converting agents at a wavelength of 310 nm are obtained, and the fitting curves obtained are also shown in [the original text]. Figure 4 .

[0075]

Example 6

[0076] The other steps are the same as in Example 2, except that in S3, the content and transmittance data of nine groups of light-converting agents at a wavelength of 337 nm are obtained, and the fitting curves obtained are also shown in [the original text]. Figure 4 .

[0077]

Example 7

[0078] The other steps are the same as in Example 2, except that in S3, the content and transmittance data of nine groups of light-converting agents at a wavelength of 247 nm are obtained, and the fitting curves obtained are also shown in [the original text]. Figure 4 .

[0079]

Example 8

[0080] The other steps are the same as in Example 2, except that in S3, the content and transmittance data of the nine groups of light-converting agents at the wavelength of the maximum absorption peak, i.e., 340 nm, are obtained, and the fitting curve obtained is also shown in [the original text]. Figure 4 .

[0081]

Example 9

[0082] The other steps are the same as in Example 2, except that in S3, the content and transmittance data of nine groups of light-converting agents at the wavelength of the maximum emission peak, i.e., 420nm, are obtained, and the fitting curve obtained is also shown in [the original text]. Figure 4 .

[0083] [Test Example]

[0084] based on Figure 4 The content of the light-converting agent (B3N) in the light-converting film was determined by fitting the curve. The transmittance of the light-converting film at wavelengths of 297 nm (light-converting agent absorption valley), 257 nm, 327 nm, 310 nm, 320 nm, 247 nm, 340 nm (maximum absorption peak), and 420 nm (maximum emission peak) was obtained as 10.8%, 1.3%, 2.0%, 7.2%, 1.8%, 1.5%, 1.2%, and 151%, respectively. Based on the wavelength and transmittance, the content of the light-converting agent (B3N) in the film was determined. Figure 4 The content of the light-converting agent was obtained from the fitted curve in Table 1.

[0085] Table 1

[0086]

[0087] As shown in Table 1, the wavelengths selected in Examples 2-5 were within a preset wavelength range (θ-θ1 to θ+θ2). Within this preset range, the transmittance variation was significant, allowing for accurate determination of the light-converting agent content, and the results were consistent, all being 1.3‰. However, for Examples 6-9, which were outside this preset wavelength range, the transmittance almost stopped changing after the light-converting agent content exceeded 0.9‰, making it difficult to detect when the content exceeded 0.9‰. Furthermore, from... Figure 5 It can be seen that the fitting curve of Example 9 approaches 0 after 0.9‰, and the content after 0.9‰ cannot be accurately determined. From Figure 6 It can be seen that the fitting curves of Examples 2 and 5 have a larger slope than those of Examples 3 and 4. This indicates that the closer the wavelength is to the absorption valley of the light-converting agent, the more obvious the change in the transmittance of the light-converting film with the content of the light-converting agent. Figure 6 The fitting curves of Examples 6, 7, and 8 in the examples are difficult to accurately determine the content after 0.9‰.

[0088] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0089] For ease of description, directional terms such as "front, back, up, down, left, right," "horizontal, vertical, horizontal," and "top, bottom" generally indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the components themselves. For example, if a device in the drawings is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0090] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0091] Unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0092] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0093] It should also be noted that the terms "one embodiment," "another embodiment," or "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0094] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0095] It should also be noted that the above are merely preferred embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A method for determining the light-converting agent within a light-converting film, characterized in that, Includes the following operations: Multiple sets of light conversion films are provided, and the multiple sets of light conversion films are tested using a fiber optic spectrometer to obtain the transmittance-wavelength test curves of the multiple sets of light conversion films. Based on the transmittance-wavelength test curves of the multiple sets of light conversion films, the content and transmittance data of the multiple sets of light conversion agents at a preset wavelength are obtained. The preset wavelength is ; in, The wavelength of the absorption valley of the optical conversion agent; The range is from 0nm to 40nm; The range is from 0nm to 30nm; Based on the content and transmittance data of the multiple sets of light-converting agents, a fitting curve is obtained at the preset wavelength. The multiple sets of light-converting films include multiple sets of light-converting films with the same type of light-converting agent but different contents.

2. The method for determining the light-converting agent within the light-converting film according to claim 1, characterized in that, Within the multiple sets of light-converting films, based on the mass of the light-converting film, the content of the light-converting agent within each film is below 2.0‰.

3. The method for determining the light-converting agent within the light-converting film according to claim 1, characterized in that, The wavelength acquisition methods for the absorption valley of the optical conversion agent include: The absorbance-wavelength curve of the light-converting agent was measured using a UV spectrophotometer; Based on the absorbance-wavelength curve, the wavelength of the absorption valley of the light-converting agent is obtained.

4. The method for determining the light-converting agent in the light-converting film according to any one of claims 1 to 3, characterized in that, Based on the fitting curve at the preset wavelength, the amount of light-converting agent added into the light-converting film is determined.

5. The method for determining the light-converting agent in the light-converting film according to any one of claims 1 to 3, characterized in that, Based on the fitting curve at the preset wavelength, the content of the light-converting agent in the light-converting film is determined.

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