Method for testing content of light conversion agent in light conversion adhesive film

Abstract

A method for testing the content of a light conversion agent in a light conversion adhesive film comprises the following steps that a plurality of solvents are adopted to extract a plurality of light conversion agents in the light conversion adhesive film, a plurality of reference samples are obtained, and the concentrations of the light conversion agents of different reference samples are different; testing the absorbance of a plurality of reference samples, and drawing an absorbance-concentration curve; and extracting the light conversion agent in the light conversion adhesive film to be detected by using the solvent to obtain a test sample, testing the absorbance of the test sample, and obtaining the content of the light conversion agent in the light conversion adhesive film to be detected based on the absorbance-concentration curve. The method comprises the following steps: extracting a light conversion agent from an adhesive film through a solvent, measuring reference samples of the light conversion agents with different concentrations, and drawing an absorbance-concentration curve; the absorbance of the to-be-measured sample is measured by the same method, and the content of the light conversion agent in the to-be-measured light conversion adhesive film is obtained based on the absorbance-concentration curve, so that the content of the light conversion agent can be accurately measured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaics, in particular to a method for testing the content of light conversion agent in light conversion adhesive film. BACKGROUND

[0002] The light conversion adhesive film contains light conversion agent, which can convert absorbed ultraviolet light into visible light, for example, converting ultraviolet light with a wavelength of 360 nm into visible light with a wavelength of 400 nm to 420 nm, which can effectively improve the power generation and reliability of photovoltaic modules.

[0003] The content of light conversion agent affects the light transmittance of light conversion adhesive film, and thus affects the efficiency of photovoltaic modules, so it is necessary to accurately measure the content of light conversion agent in light conversion adhesive film.

[0004] In the prior art, the light transmittance test method is usually selected, which cannot effectively monitor the content change of light conversion agent in light conversion adhesive film, and the test precision is low.

[0005] Therefore, it is necessary to provide an improved method for testing the content of light conversion agent in light conversion adhesive film to solve the above technical problems. SUMMARY

[0006] The present application provides a method for testing the content of light conversion agent in light conversion adhesive film, which can accurately measure the content of light conversion agent.

[0007] A method for testing the content of light conversion agent in light conversion adhesive film, comprising the following steps:

[0008] A number of solvents are used to extract light conversion agent from a number of light conversion adhesive films to obtain a number of reference samples, and the concentrations of light conversion agent in different reference samples are different;

[0009] Test the absorbance of a number of reference samples and draw the absorbance-concentration curve;

[0010] The light conversion agent in the test light conversion adhesive film is extracted by the solvent to obtain a test sample, the absorbance of the test sample is tested, and the content of light conversion agent in the test light conversion adhesive film is obtained based on the absorbance-concentration curve.

[0011] A method for testing the content of light conversion agent in light conversion adhesive film, comprising the following steps:

[0012] A number of solvents are used to extract light conversion agent from a number of light conversion adhesive films to obtain a number of reference samples, and the concentrations of light conversion agent in different reference samples are different;

[0013] Test the absorbance of a number of reference samples and draw the first absorbance-concentration curve;

[0014] The second absorbance-concentration curve is drawn by using the aforementioned steps for the light conversion adhesive film to be tested with a known concentration of light conversion agent, and the second absorbance-concentration curve and the first absorbance-concentration curve are compared to determine whether the content of the light conversion agent in the light conversion adhesive film to be tested meets the standard.

[0015] In an embodiment, the light conversion agent in several portions of the light conversion adhesive film to be tested is extracted by using several portions of the solvent to obtain several test samples, the concentrations of the light conversion agent in the several test samples and the several reference samples are the same, the slope of the first absorbance-concentration curve is K1, the slope of the second absorbance-concentration curve is K2, and it is determined whether K2 / K1≥99%. If yes, the content of the light conversion agent in the light conversion adhesive film to be tested meets the standard; if no, the content of the light conversion agent in the light conversion adhesive film to be tested does not meet the standard.

[0016] In an embodiment, the solvent is selected from an organic solvent, and the organic solvent includes a mixture of one or more of tetrahydrofuran, n-hexane, acetone, and xylene.

[0017] In an embodiment, obtaining the several reference samples includes the following steps: weighing several light conversion adhesive film samples with different masses; measuring several solvents with the same volume; adding the several light conversion adhesive film samples with different masses into the several solvents with the same volume to obtain light conversion adhesive film mixtures; and performing heat treatment on the several light conversion adhesive film mixtures at a temperature of 50℃±5℃ for a time of 4h±0.5h to obtain the several reference samples.

[0018] In an embodiment, obtaining the several reference samples includes the following steps: weighing several light conversion adhesive film samples with the same mass; measuring several solvents with different volumes; adding the several light conversion adhesive film samples with the same mass into the several solvents with different volumes to obtain light conversion adhesive film mixtures; and performing heat treatment on the several light conversion adhesive film mixtures at a temperature of 50℃±5℃ for a time of 4h±0.5h to obtain the several reference samples.

[0019] In an embodiment, obtaining the several reference samples includes the following steps: weighing several light conversion adhesive film samples with different masses; measuring several solvents with different volumes; adding the several light conversion adhesive film samples into the several solvents to obtain light conversion adhesive film mixtures; and performing heat treatment on the several light conversion adhesive film mixtures at a temperature of 50℃±5℃ for a time of 4h±0.5h to obtain the several reference samples.

[0020] In an embodiment, the reference sample is placed in a room temperature environment for stabilization for 24h±3h or is cooled to room temperature before testing.

[0021] In an embodiment, the method of testing the light transmittance of the light conversion adhesive film comprises: selecting a plurality of wavelengths corresponding to the light transmittance of the light conversion adhesive film; and testing the light transmittance of the light conversion adhesive film at the plurality of wavelengths.

[0022] In an embodiment, the method of drawing the absorbance-concentration curve comprises: selecting data of absorbance corresponding to a predetermined wavelength in the absorbance curve to draw the absorbance-concentration curve, the predetermined wavelength being a wavelength corresponding to an absorbance of not less than 80% of the maximum absorbance in the absorbance curve; or, the predetermined wavelength being a wavelength within ±20 nm of the wavelength corresponding to the maximum absorbance in the absorbance curve.

[0023] In an embodiment, the method of obtaining the standard curve equation based on the absorbance-concentration curve comprises: obtaining the standard curve equation based on the absorbance-concentration curve, the R 2 The R2 is greater than 0.99.

[0024] In an embodiment, the light conversion adhesive film to be tested is selected from different stages of the same light conversion adhesive film in a use cycle.

[0025] In an embodiment, the light conversion adhesive film to be tested is selected from different regions of the same light conversion adhesive film.

[0026] The method of testing the content of the light conversion agent in the light conversion adhesive film of the present application comprises: extracting the light conversion agent from the light conversion adhesive film by a solvent, measuring the absorbance of the reference sample of the light conversion agent with different concentrations, drawing the absorbance-concentration curve, measuring the absorbance of the sample to be tested by the same method, and obtaining the content of the light conversion agent in the light conversion adhesive film to be tested based on the absorbance-concentration curve, thereby ensuring the accurate measurement of the content of the light conversion agent. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The absorbance-concentration curve of a series of samples measured by the method of testing the content of the light conversion agent in the light conversion adhesive film of the present application;

[0028] Figure 2 The absorbance-concentration standard curve of a series of samples measured by the method of testing the content of the light conversion agent in the light conversion adhesive film of the present application;

[0029] Figure 3 The absorbance-concentration curve of the light conversion adhesive film of the previous batch, the 3-month batch and the 5-month batch tested by the method of testing the content of the light conversion agent in the light conversion adhesive film of the present application. DETAILED DESCRIPTION

[0030] The present application will be described in detail below with reference to the specific embodiments shown in the drawings. However, these embodiments do not limit the present application, and the structural, method, or functional changes made by those of ordinary skill in the art based on these embodiments are included in the protection scope of the present application.

[0031] In various drawings of the present application, the sizes of some structures or parts are exaggerated relative to those of other structures or parts for ease of illustration, and thus only serve to illustrate the basic structure of the subject matter of the present application.

[0032] The inventors have found that the current light transmittance test uses 5 nm as a wave band to monitor the change in light transmittance, and cannot simultaneously test the light conversion transmittance of the light conversion agent, thus resulting in poor test accuracy of the content of the light conversion agent and being unable to accurately measure the concentration of the light conversion agent in the light conversion adhesive film.

[0033] The present application aims to provide a method for testing the content of a light conversion agent in a light conversion adhesive film, so as to accurately measure the content of the light conversion agent.

[0034] The method for testing the content of the light conversion agent in the light conversion adhesive film comprises the following steps:

[0035] S1 extracts the light conversion agent in several portions of the light conversion adhesive film using several portions of a solvent to obtain several reference samples, and the concentrations of the light conversion agent in different reference samples are different;

[0036] S2 tests the absorbance of the several reference samples and draws an absorbance-concentration curve;

[0037] S3 extracts the light conversion agent in the to-be-tested light conversion adhesive film using the solvent to obtain a test sample, tests the absorbance of the test sample, and obtains the content of the light conversion agent in the to-be-tested light conversion adhesive film based on the absorbance-concentration curve.

[0038] The solvent is selected from an organic solvent capable of extracting the light conversion agent, so as to efficiently and completely extract and separate the light conversion agent from the light conversion adhesive film. In an embodiment, the organic solvent comprises a mixture of one or more of tetrahydrofuran, n-hexane, acetone, and dimethylbenzene.

[0039] The solvent is selected from a solvent for high-performance liquid chromatography, which can eliminate the influence of impurities in the solvent on the measurement and improve the measurement accuracy. In order to avoid the introduction of impurities during the test, the present application selects a pollution-free transparent glass screw neck bottle as a test bottle for measurement.

[0040] In addition, in order to improve the accuracy of the measurement, a pipette is preferably used to measure the solvent, and an electronic balance is used to weigh the light conversion adhesive film.

[0041] The step of "obtaining several reference samples" in step S1 comprises the following steps:

[0042] Weigh several light conversion adhesive film samples with different masses;

[0043] measuring a plurality of volumes of the same solvent;

[0044] adding a plurality of light conversion adhesive film samples with different masses into a plurality of volumes of the same solvent to obtain a light conversion adhesive film mixture;

[0045] performing heat treatment on the plurality of light conversion adhesive film mixtures at a temperature of 50°C±5°C for a time of 4h±0.5h, so that the light conversion agent in the light conversion adhesive film is extracted into the solvent to obtain a plurality of reference samples.

[0046] In an embodiment, a plurality of light conversion adhesive films with masses of 5mg±0.05mg, 10mg±0.05mg, 15mg±0.05mg, 20mg±0.05mg, and 25mg±0.05mg are weighed; 20mL of solvent is measured and added into a transparent glass screw neck bottle; the plurality of light conversion adhesive films are added into the transparent glass screw neck bottle one by one; all the transparent glass screw neck bottles are placed in an oven, the temperature is set to 50°C±5°C, and the time is 4h±0.5h, so that the light conversion agent in the light conversion adhesive film is completely extracted to obtain a series of reference samples with different concentrations of light conversion agent.

[0047] Alternatively, the step of “obtaining a plurality of reference samples” in step S1 includes the following steps:

[0048] weighing a plurality of light conversion adhesive film samples with the same mass;

[0049] measuring a plurality of volumes of different solvents;

[0050] adding a plurality of light conversion adhesive film samples with the same mass into a plurality of volumes of different solvents to obtain a light conversion adhesive film mixture;

[0051] performing heat treatment on the plurality of light conversion adhesive film mixtures at a temperature of 50°C±5°C for a time of 4h±0.5h, so that the light conversion agent in the light conversion adhesive film is extracted into the solvent to obtain a plurality of reference samples.

[0052] In an embodiment, a plurality of light conversion adhesive films with a mass of 10mg±0.05mg are weighed; solvents with volumes of 40mL, 20mL, 13.33mL, 10mL, and 8mL are measured and added into transparent glass screw neck bottles; the plurality of light conversion adhesive films are added into the transparent glass screw neck bottles one by one; all the transparent glass screw neck bottles are placed in an oven, the temperature is set to 50°C±5°C, and the time is 4h±0.5h, so that the light conversion agent in the light conversion adhesive film is completely extracted to obtain a series of reference samples with different concentrations of light conversion agent.

[0053] Alternatively, the step of “obtaining a plurality of reference samples” in step S1 includes the following steps:

[0054] Take several portions of light conversion adhesive film samples, and the mass of at least two portions of the light conversion adhesive film samples is different;

[0055] Take several portions of solvents, and the volume of at least two portions of the solvents is different;

[0056] Add the several portions of the light conversion adhesive film samples into the several portions of the solvents to obtain light conversion adhesive film mixed liquids;

[0057] Perform heat treatment on the several light conversion adhesive film mixed liquids, the temperature is 50℃±5℃, and the time is 4h±0.5h, the light conversion agent in the light conversion adhesive film is extracted into the solvent to obtain several reference samples.

[0058] In an embodiment, the mass of the light conversion adhesive film is 7.5mg±0.05mg, 12.5mg±0.05mg, 15mg±0.05mg, 15mg±0.05mg, and 12.5mg±0.05mg respectively; the volume of the solvent is 30mL, 25mL, 20mL, 15mL, and 10mL respectively; the several portions of the light conversion adhesive film are added into the transparent glass screw neck bottles one by one; and all the transparent glass screw neck bottles are placed in an oven, the temperature is set to 50℃±5℃, and the time is 4h±0.5h, so that the light conversion agent in the light conversion adhesive film is completely extracted to obtain a series of reference samples with different concentrations of the light conversion agent.

[0059] Before testing, the sample is placed in a room temperature environment for 24h±3h or is cooled to room temperature, and the absorbance test is performed after the sample is stable, so as to avoid that the sample is unstable or the solvent volatilizes to contaminate the equipment.

[0060] In step S2, the ultraviolet-visible spectrophotometer (equipment model number: Lambda 950) is used for testing, and the STD standard detector module is used as an accessory.

[0061] The "testing the absorbance of the several reference samples" includes:

[0062] S21, cleaning the accessories of the equipment, such as the cuvette. The same solvent as the reference sample is used to rinse the reference cuvette and the sample cuvette, and the light transmission surface of the reference cuvette and the sample cuvette is cleaned. In an embodiment, the dust-free cloth is used to wipe the light transmission surface to ensure that the surface is clean and uncontaminated.

[0063] S22, adding the same solvent as the reference sample into the reference cuvette and placing the reference cuvette into the equipment as a reference, and then adding the several reference samples into the sample cuvette one by one and placing the sample cuvette into the equipment for testing.

[0064] The "drawing the absorbance-concentration curve" includes: selecting the data of the absorbance corresponding to the predetermined wavelength in the absorbance curve to draw the absorbance-concentration curve. The predetermined wavelength is also used as the wavelength reference when the sample to be measured is measured subsequently.

[0065] In one embodiment, the predetermined wavelength is the wavelength corresponding to the absorbance of 80% of the maximum absorbance in the absorbance curve. The wavelength corresponding to the higher absorbance is selected to improve the sensitivity of the measurement and reduce the limit of the concentration of the measurement.

[0066] In another embodiment, the predetermined wavelength is within the range of ±20 nm of the wavelength corresponding to the maximum absorbance in the absorbance curve, preferably ±15 nm, preferably ±10 nm, and preferably ±5 nm. Within the above wavelength range, the absorbance is close to the maximum absorbance, which can also ensure the sensitivity of the measurement.

[0067] Preferably, the predetermined wavelength is selected as the wavelength corresponding to the maximum absorbance in the absorbance curve, which has the highest sensitivity of the measurement.

[0068] Based on the absorbance-concentration curve, a standard curve equation can also be obtained. The method of the present application can ensure that the R 2 At 0.99 or above, different batches of light conversion adhesive films are tested for the content of light conversion agent by the method, and the test results meet the requirements of measuring the concentration of light conversion agent in the light conversion adhesive film and monitoring the content change of the light conversion agent in the light conversion adhesive film.

[0069] In step S3, the light conversion adhesive film to be measured is treated and measured in the same way as the reference sample, which can reduce the measurement error and ensure the accuracy of the measurement results.

[0070] In one embodiment, the light conversion adhesive film to be measured is selected from the same light conversion adhesive film at different stages of the use cycle, which can monitor the content change of the light conversion agent in the light conversion adhesive film during the use cycle. Specifically, experimental samples identical to the photovoltaic module are prepared and placed in the same environment as the photovoltaic module or in a simulated environment, and samples are taken at different stages for testing.

[0071] In another embodiment, the light conversion adhesive film to be measured is selected from different regions of the same light conversion adhesive film to detect the uniformity of the distribution of the light conversion agent in the light conversion adhesive film. The closer the concentration of the light conversion agent in the same region, the more uniform the distribution of the light conversion agent.

[0072] In summary, the method for testing the content of the light conversion agent in the light conversion adhesive film of the present application extracts the light conversion agent from the adhesive film by solvent, measures the reference samples of different concentrations of the light conversion agent, draws the absorbance-concentration curve, measures the absorbance of the sample to be measured by the same method, and obtains the content of the light conversion agent in the light conversion adhesive film to be measured based on the absorbance-concentration curve, which can ensure accurate measurement of the content of the light conversion agent.

[0073] In the following, a specific embodiment of the method for testing the content of the light conversion agent in the light conversion adhesive film of the present application will be described in detail.

[0074] Five portions of the light-converting film were weighed: Sample 1: 5 mg; Sample 2: 10 mg; Sample 3: 15 mg; Sample 4: 20 mg; Sample 5: 25 mg.

[0075] Use a pipette to accurately measure five 20mL portions of tetrahydrofuran and add them to separate transparent glass screw-top bottles.

[0076] Add the above samples 1, 2, 3, 4, and 5 into the transparent glass screw-top bottle one by one, and label them as sample #1, sample #2, sample #3, sample #4, and sample #5, respectively.

[0077] Place all the transparent glass screw-top bottles in an oven at 50°C for 4 hours to extract the light-converting agent from the light-converting film.

[0078] The reference sample was placed at room temperature for 24 hours to allow it to stabilize. After that, the absorbance was measured using a Lambda 950 UV-Vis spectrophotometer with the STD standard detector module as an accessory.

[0079] The reference cuvette and sample cuvette were rinsed with tetrahydrofuran and the translucent surfaces were wiped with a lint-free cloth to ensure they were clean and free of contamination.

[0080] Use a pipette to transfer clean tetrahydrofuran into a reference cuvette, then place it in the device as a reference. Use a pipette to transfer the reference sample one by one into the sample cuvette, place them in the device, set the software parameters, and perform absorbance measurements to obtain a series of absorbance curves, such as... Figure 1 As shown.

[0081] The spectral results of all samples are superimposed, and a calibration curve is plotted to obtain the equation of the standard curve, as shown below. Figure 2 As shown.

[0082] Weigh out a sample of the light-converting film with mass m, extract the light-converting agent from the film using a solvent to obtain a test sample, detect the absorbance of the test sample, and find or calculate the concentration of the light-converting agent in the test sample from the absorbance-concentration curve. Obtain the mass m1 of the light-converting agent based on the concentration of the light-converting agent and the volume of the test sample; m1 / m is the content of the light-converting agent in the light-converting film.

[0083] The present invention also provides another method for testing the content of light-converting agent in light-converting films, which differs from the above embodiments only in step S3.

[0084] Step S3 is as follows: For the light-converting film to be tested with a known concentration of the light-converting agent, a second absorbance-concentration curve is plotted using the aforementioned steps. The second absorbance-concentration curve is compared with the first absorbance-concentration curve to determine whether the light-converting agent content in the film meets the standard. This method can easily detect changes in the light-converting agent content or whether the content meets the standard in different batches of light-converting films.

[0085] In one embodiment, several portions of solvent are used to extract the light-converting agent from several portions of the light-converting film to be tested, resulting in several samples to be tested. The concentrations of the light-converting agent in the samples to be tested correspond one-to-one with those in the reference samples. The slope of the first absorbance-concentration curve is K1, and the slope of the second absorbance-concentration curve is K2. It is determined whether K2 / K1 is ≥99%. If so, the content of the light-converting agent in the light-converting film to be tested is basically consistent with the known concentration, and it can be determined to meet the standard. If not, the content of the light-converting agent in the light-converting film to be tested does not meet the standard.

[0086] The following will use another specific embodiment to test the light-converting film from the early batch, the March batch, and the May batch with the same concentration of light-converting agent, and will describe in detail the test method for the light-converting agent content in the light-converting film of the present invention.

[0087] Five samples of light-converting film were weighed from the previous batch: Sample 1: 5 mg; Sample 2: 10 mg; Sample 3: 15 mg; Sample 4: 20 mg; Sample 5: 25 mg.

[0088] Use a pipette to accurately measure five 20mL portions of tetrahydrofuran and add them to separate transparent glass screw-top bottles.

[0089] Add the above samples 1, 2, 3, 4, and 5 into the transparent glass screw-top bottle one by one, and label them as sample #1, sample #2, sample #3, sample #4, and sample #5, respectively.

[0090] Place all the transparent glass screw-top bottles in an oven at 50°C for 4 hours to extract the light-converting agent from the light-converting film.

[0091] The reference sample was placed at room temperature for 24 hours to allow it to stabilize. After that, the absorbance was measured using a Lambda 950 UV-Vis spectrophotometer with the STD standard detector module as an accessory.

[0092] The reference cuvette and sample cuvette were rinsed with tetrahydrofuran and the translucent surfaces were wiped with a lint-free cloth to ensure they were clean and free of contamination.

[0093] Use a pipette to transfer clean tetrahydrofuran into a reference cuvette, then place it in the device as a reference. Use a pipette to transfer the reference sample one by one into the sample cuvette, place them in the device, set the software parameters, and perform absorbance measurements to obtain a series of absorbance curves. Superimpose the spectral results of all samples and plot the absorbance-concentration curve, as shown below. Figure 3 As shown.

[0094] Using the above testing method, the March and May batches of light-converting adhesive films were tested, and the results are as follows: Figure 3 As shown, the curve R 2 Above 0.99. (By) Figure 3 It can be seen that the content of the light conversion agent varies slightly in different batches.

[0095] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0096] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for testing the content of light-converting agent in a light-converting film, characterized in that, Includes the following steps: Several solvents were used to extract the light-converting agent from several light-converting films to obtain several reference samples. The concentration of the light-converting agent in different reference samples was different. Test the absorbance of several reference samples and plot the absorbance-concentration curve; The solvent is used to extract the light-converting agent from the light-converting film to be tested to obtain a test sample. The absorbance of the test sample is tested, and the content of the light-converting agent in the light-converting film to be tested is obtained based on the absorbance-concentration curve.

2. A method for testing the content of light-converting agent in a light-converting film, characterized in that, Includes the following steps: Several solvents were used to extract the light-converting agent from several light-converting films to obtain several reference samples. The concentration of the light-converting agent in different reference samples was different. Test the absorbance of several reference samples and plot the first absorbance-concentration curve; For the light-converting film to be tested with a known concentration of light-converting agent, the aforementioned steps are used to plot a second absorbance-concentration curve. The second absorbance-concentration curve is compared with the first absorbance-concentration curve to determine whether the content of light-converting agent in the light-converting film to be tested meets the standard.

3. The method for testing the content of light-converting agent in the light-converting film according to claim 2, characterized in that: Several samples of the light-converting agent were extracted from several samples of the light-converting film to be tested using several solvents. The concentrations of the light-converting agent in the samples to be tested and the reference samples corresponded one-to-one. The slope of the first absorbance-concentration curve was K1, and the slope of the second absorbance-concentration curve was K2. It was determined whether K2 / K1 was ≥99%. If it was, the content of the light-converting agent in the light-converting film to be tested met the standard; if not, the content of the light-converting agent in the light-converting film to be tested did not meet the standard.

4. The method for testing the content of light-converting agent in a light-converting film according to any one of claims 1-3, characterized in that: The solvent is selected from organic solvents, including one or more of tetrahydrofuran, n-hexane, acetone, and xylene.

5. The method for testing the content of light-converting agent in a light-converting film according to any one of claims 1-3, characterized in that: "Obtaining several reference samples" includes the following steps: Weigh out several samples of light-converting adhesive film with different masses; Take several portions of solvent of the same volume; Several samples of optically convertible films of different masses were added to several solvents of the same volume to obtain a mixture of optically convertible films. Several portions of the light-converting film mixture were heat-treated at a temperature of 50℃±5℃ for 4h±0.5h to obtain several reference samples. Alternatively, "obtaining several reference samples" includes the following steps: Weigh out several samples of light-converting adhesive film of the same mass; Take several portions of solvent of different volumes; Several samples of optically convertible films of the same mass were added to several solvents of different volumes to obtain a mixture of optically convertible films. Several portions of the light-converting film mixture were heat-treated at a temperature of 50℃±5℃ for 4h±0.5h to obtain several reference samples. Alternatively, obtaining several reference samples includes the following steps: Weigh out several samples of light-converting film, with at least two samples having different masses; Take several portions of solvent, with at least two portions having different volumes; Several portions of optically conductive film samples were added to several portions of solvent to obtain an optically conductive film mixture; Several samples of the light-converting adhesive film mixture were heat-treated at a temperature of 50℃±5℃ for 4h±0.5h to obtain several reference samples.

6. The method for testing the content of light-converting agent in a light-converting film according to any one of claims 1-3, characterized in that: Before testing, place the reference sample in a stable environment at room temperature for 24h±3h or cool it down to room temperature.

7. The method for testing the content of light-converting agent in a light-converting film according to any one of claims 1-3, characterized in that: "Testing the absorbance of several reference samples" includes: Rinse the reference cuvette and sample cuvette with the same solvent as the reference sample, and clean the light-transmitting surfaces of the reference cuvette and sample cuvette; Add the same solvent as the reference sample to the reference cuvette as a reference; add several reference samples one by one to the sample cuvette for testing.

8. The method for testing the content of light-converting agent in a light-converting film according to any one of claims 1-3, characterized in that: "Plotting an absorbance-concentration curve" includes: selecting absorbance data corresponding to a predetermined wavelength from several absorbance curves to plot an absorbance-concentration curve, wherein the predetermined wavelength is the wavelength corresponding to an absorbance not less than 80% of the maximum absorbance in the absorbance curve; or, the predetermined wavelength is within ±20nm of the wavelength corresponding to the maximum absorbance in the absorbance curve.

9. The method for testing the content of light-converting agent in a light-converting film according to claim 8, characterized in that: The standard curve equation is derived from the absorbance-concentration curve, and the R-squared value of the curve is... 2 Above 0.

99.

10. The method for testing the content of light-converting agent in a light-converting film according to any one of claims 1-3, characterized in that: The light-converting films to be tested were selected from different stages of the same light-converting film's service life. Alternatively, the light-converting film to be tested may be selected from different regions of the same light-converting film.

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