A blue light-proof LED filtering film and a preparation method thereof

Abstract

This invention relates to a blue light blocking LED filter film and its preparation method. The blue light blocking LED filter film comprises, from bottom to top, a substrate and a mixed solution film. The mixed solution contains an organic material a, which has a strong absorption effect on blue light, and an organic material b, whose absorption peak is in the non-blue light band. This invention selects organic material a, which has a strong absorption effect on blue light, and simultaneously selects organic material b, whose absorption peak is in the non-blue light band. Organic material b balances the blue light absorption of the LED spectrum by organic material a, reducing the proportion of blue light in the transmission spectrum and improving the color balance of the LED light source.

Description

Technical Field

[0001] This invention relates to a blue light blocking LED filter membrane and its preparation method, belonging to the field of LED filter membrane technology. Background Technology

[0002] Existing LED light sources need to resolve the contradiction between high eye protection and high color rendering index, that is, to find a technology that can solve the problem of excessive blue light content while maintaining the high color rendering index of LED light sources.

[0003] In recent years, light-emitting diode (LED) lighting has become the mainstream lighting technology worldwide due to its advantages such as high energy efficiency and long lifespan. However, with the widespread use of LEDs, the potential harm to human health from the excessive blue light component in their spectrum has increasingly attracted attention, especially the potential for retinal photochemical damage, visual fatigue, and circadian rhythm disruption. Currently, most "eye-protecting" LED lamps on the market use simple blue light filtering to reduce blue light hazards, but this method has obvious drawbacks: drastically reducing the blue light band will seriously disrupt the continuity of the light source spectrum, leading to a sharp drop in the color rendering index (CRI), causing color distortion of objects and increasing the visual cognitive burden; while to maintain high color rendering, the contribution of blue light to color rendering cannot be lacking, and a certain proportion of blue light must be maintained.

[0004] Therefore, existing LED light sources urgently need to resolve the contradiction between "high eye protection" and "high color rendering" and explore technical paths that can effectively control blue light content while maintaining high color rendering performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a blue light blocking LED filter membrane and its preparation method.

[0006] The blue light blocking LED filter membrane of the present invention uses a specific organic material b to selectively filter out harmful blue light near 445 nm, increases the selective absorption of light in the 500 to 800 nm wavelength band by organic material a, and at the same time, the specific ratio of organic material b and organic material a significantly improves the color rendering index (CRI) of the LED, achieving a balance between blue light blocking and high luminous efficiency for the first time.

[0007] The present invention also provides a method for preparing the above-mentioned blue light blocking LED filter film, which adopts a solution method for one-step film formation. This preparation method is simple, easy to operate, and has a wide range of applications.

[0008] Terminology Explanation:

[0009] PC 61 BM is a small molecule photovoltaic material with the molecular formula [6,6]-Phenyl-C61-butyric acidmethyl ester, which is mainly used as an acceptor material for organic photovoltaic thin films.

[0010] PC 71 BM is a small molecule photovoltaic material with the molecular formula [6,6]-Phenyl-C71-butyric acidmethyl ester, which is mainly used as an acceptor material for organic photovoltaic thin films.

[0011] C 60 Fullerene is a small molecule photovoltaic material with the molecular formula [5,6]Fullerene-C60-Ih, which is mainly used as an acceptor material for organic photovoltaic thin films.

[0012] C 70 Fullerene is a small molecule photovoltaic material with the molecular formula [5,6]Fullerene-C70-Ih, which is mainly used as an acceptor material for organic photovoltaic thin films.

[0013] ICBA is a small molecule photovoltaic material with the molecular formula 1',1'',4',4''-Tetrahydro-di[1,4]methanonaphthaleno[1,2:2',3',56,60:2'',3''][5,6]fullerene-C60, C60derivative, indene-C60 bisadduct. It is mainly used as an acceptor material for organic photovoltaic thin films.

[0014] Bis-PC 61 BM is a small molecule photovoltaic material with the molecular formula 3',3''-Diphenyl-3'H,3''H-dicyclopropa[1,9,C60 derivative, indene-C61 bisadduct, mainly used as an acceptor material for organic photovoltaic thin films.

[0015] F-PC 61 BM is a small molecule photovoltaic material with the molecular formula [6,6]-phenyl-C61-butyric acid1H,1H-perfluoro-1-octyl ester, which is mainly used as an acceptor material for organic photovoltaic thin films.

[0016] Y6 is a small molecule photovoltaic material with the molecular formula 2,2'-((2Z,2'Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2",3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile, mainly used as an acceptor material for organic photovoltaic thin films.

[0017] BTP-eC9 is a small molecule photovoltaic material with the molecular formula 2,2'-[[12,13-Bis(2-butyloctyl)-12,13-dihydro-3,9-dinonylbisthieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-e:2',3'-g][2,1,3]benzothiadiazole-2,10-diyl]bis[methylidyne(5,6-chloro-3-oxo-1H-indene-2,1(3H)-diylidene)]] bis[propanedinitrile]. It is mainly used as an acceptor material for organic photovoltaic thin films.

[0018] Y11 is a small molecule photovoltaic material with the molecular formula 3,5,7-Triaza-1-azoniatricyclo[3.3.1.13,7]decane,1-(2-hydroxyethyl)-,broMide;1-(2-Hydroxyethyl)-3,5,7-triaza-1-azoniaChemicalbooktricyclo[3.3.1.13,7]decaneBroMide;NSC206142;1-(2-Hydroxyethyl)-3,5,7-triaza-1-azaniatricyclo[3.3.1.13,7]decanebromide. It is mainly used as an acceptor material for organic photovoltaic thin films.

[0019] N3 is a small molecule photovoltaic material with the molecular formula 2,2'-((2Z,2'Z)-((12,13-bis(3-ethylheptyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile, mainly used as an acceptor material for organic photovoltaic thin films.

[0020] BTP-BO-4F is a small-molecule photovoltaic material with the molecular formula 2,2-((2Z,2Z)-((12,13-bis(2-butyloctyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2,3:4,5]thieno[2,3:4,5]pyrrolo[3,2-g]thieno[2,3:4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile. It is mainly used as an acceptor material for organic photovoltaic thin films.

[0021] BZO-4Cl is a small-molecule photovoltaic material with the molecular formula 2,2'-((2Z,2'Z)-((6,12,13-tris(2-ethylhexyl)-3,9bis((undecyloxy)methyl)-12,13-dihydro-6H-thieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b][1,2,3]triazolo[4,5-e]indole-2,10diyl)bis(methaneylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1diylidene))dimalononitrile. It is mainly used as an acceptor material for organic photovoltaic thin films.

[0022] BTA3 is a small molecule photovoltaic material with the molecular formula 2,2'-((5Z,5'Z)-5,5'-((7,7'-(4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(2-octyl-2H-benzo[d][1,2,3]triazole-7,4-diyl))bis(methanylylidene))bis(3-ethyl-4-oxothiazolidine-5,2-diylidene))dimalononitrile, primarily used as an acceptor material for organic photovoltaic thin films.

[0023] ITIC is a small-molecule photovoltaic material with the molecular formula 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2',3'-d']-s-indaceno[1,2-b:5,6-b']dithiophene, primarily used as an acceptor material for organic photovoltaic thin films.

[0024] IT4F is a small-molecule photovoltaic material with the molecular formula 3,9-bis(2-methylene-((3-(1,1-dicyanomethylene)-6,7-difluoro)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2',3'-d']-s-indaceno[1,2-b:5,6-b']dithiophene. It is mainly used as an acceptor material for organic photovoltaic thin films.

[0025] IEICO-4F is a small-molecule photovoltaic material with the molecular formula 2,2'-((2Z,2'Z)-(((4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydro-sindaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(4-((2-ethylhexyl)oxy)thiophene-5,2-diyl))bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile. It is mainly used as an acceptor material for organic photovoltaic thin films.

[0026] BTP-4Cl is a small molecule photovoltaic material with the molecular formula 2,2'-((2Z,2'Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2",3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-dichloro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile. It is mainly used as an acceptor material for organic photovoltaic thin films.

[0027] COi8DFIC is a small molecule photovoltaic material with the molecular formula 2,2'-[[4,4,11,11-tetrakis(4-hexylphenyl)-4,11-dihydrothieno[2',3':4,5]thieno[2,3-d]thieno[2'''',3'''':4''',5''']thieno[2''',3''':4'',5'']pyrano[2'',3'':4',5']thieno[2',3'':4,5]thieno[3,2-b]pyran-2,9-diyl]bis[methylidyne(5,6-difluoro, and is mainly used as an acceptor material for organic photovoltaic thin films.

[0028] N2200 is a polymer photovoltaic material with the molecular formula Poly{[N,N'-bis(2-octyldodecyl)naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)}, which is mainly used as an acceptor material for organic photovoltaic thin films.

[0029] IDIC16 is a small molecule photovoltaic material with the molecular formula Synthiesis of 2,2'-((2Z,2'Z)-((4,4,9,9-tetrahexadecyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile, primarily used as an acceptor material for organic photovoltaic thin films.

[0030] Y5 is a small molecule photovoltaic material with the molecular formula ((2,2'-((2Z,2'Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro[1,2,5]thiadiazolo[3,4e]thieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro1H-indene-2,1-diylidene))dimalononitrile), mainly used as an acceptor material for organic photovoltaic thin films.

[0031] L8-BO is a small molecule photovoltaic material with the molecular formula 2,2'-((2Z,2'Z)-((12,13-bis(2-ethylhexyl)-3,9-(2-butyloctyl)-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2",3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile, mainly used as an acceptor material for organic photovoltaic thin films.

[0032] PM6 is a polymer photovoltaic material with the molecular formula Poly[(2,6-(4,8-bis(5-(2-ethylhexyl-3-fluoro)thiophen-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione)], mainly used as a donor material for organic photovoltaic thin films.

[0033] PBDB-T is a polymer photovoltaic material with the molecular formula Poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione)], primarily used as a donor material for organic photovoltaic thin films.

[0034] PTB7-Th is a polymer photovoltaic material with the molecular formula Poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)], mainly used as a donor material for organic photovoltaic thin films.

[0035] J52 is a polymer photovoltaic material with the molecular formula Poly[[5,6-difluoro-2-(2-hexyldecyl)-2H-benzotriazole-4,7-diyl]-2,5-thiophenediyl[4,8-bis[5-(2-ethylhexyl)-2-thienyl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl]-2,5-thiophenediyl]. It is mainly used as a donor material for organic photovoltaic thin films.

[0036] P3HT is a polymer photovoltaic material with the molecular formula Poly(3-hexylthiophene-2,5-diyl), mainly used as a donor material for organic photovoltaic thin films.

[0037] D18 is a polymer photovoltaic material with the molecular formula Poly[(2,6-(4,8-bis(5-(2-ethylhexyl)-4-fluoro)thiophen-2-yl)-benzo[1,2-b:4,5-b']dithiophene)-alt-5,5'-(5,8-bis(4-(2-butyloctyl)thiophen-2-yl)dithieno[3',2':3,4;2'',3'':5,6]benzo[1,2-c][1,2,5]thiadiazole)], mainly used as a donor material for organic photovoltaic thin films.

[0038] D18-Cl is a polymer photovoltaic material with the molecular formula Poly[(2,6-(4,8-bis(5-(2-ethylhexyl)-4-chlorothiophen-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-5,5'-(5,8-bis(4-(2-butyloctyl)thiophen-2-yl)dithieno[3',2':3,4;2'',3'':5,6]benzo[1,2-c][1,2,5]thiadiazole)], mainly used as a donor material for organic photovoltaic thin films.

[0039] PCDTBT is a polymer photovoltaic material with the molecular formula Poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)], mainly used as a donor material for organic photovoltaic thin films.

[0040] PffBT4T-2OD is a polymer photovoltaic material with the molecular formula Poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3'''-di(2-octyldodecyl)-2,2';5',2'';5'',2'''-quaterthiophen-5,5'''-diyl)], mainly used as a donor material for organic photovoltaic thin films.

[0041] BTR-Cl is a small-molecule photovoltaic material with the molecular formula 5,5'-[[4,8-bis[5-(2-ethylhexyl)-4-chloro-2-thienyl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl]bis[(3',3''-dihexyl[2,2':5',2''-terthiophene]-5'',5-diyl)methylidyne ]]bis[3-hexyl-2-thioxo-4-thiazolidinone]. It is mainly used as a donor material for organic photovoltaic thin films.

[0042] NT812 is a polymer photovoltaic material with the molecular formula naphtho[1,2-c:5,6-c']bis([1,2,5]-thiadiazole), mainly used as a donor material for organic photovoltaic thin films.

[0043] PBDB-T-SF is a polymer photovoltaic material with the molecular formula Poly[(2,6 (4,8 bis (5(2ethylhexylthio)4fluorothiophen2yl)benzo[1,2b:4,5b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'c:4',5'c']dithiophene4,8 dione)], which is mainly used as a donor material for organic photovoltaic thin films.

[0044] PTQ10 is a polymer photovoltaic material with the molecular formula Poly[[6,7-difluoro[(2-hexyldecyl)oxy]-5,8-quinoxalinediyl]-2,5-thiophenediyl ]], mainly used as a donor material for organic photovoltaic thin films.

[0045] PBDTTPD is a polymer photovoltaic material with the molecular formula Poly[(5,6-dihydro-5-octyl-4,6-dioxo-4H-thieno[3,4-c]pyrrole-1,3-diyl)[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl]], which is mainly used as a donor material for organic photovoltaic thin films.

[0046] UVO: Ultraviolet ozone treatment cleans the ITO surface while optimizing its work function.

[0047] The technical solution of this invention is as follows:

[0048] A blue light blocking LED filter film includes a transparent substrate and a filter film layer disposed on the surface of the transparent substrate. The filter film layer is prepared by organic material a with an absorption peak in the 500 to 800 nanometer band and organic material b with an absorption peak in the 300 to 500 nanometer band, wherein the mass ratio of organic material a to organic material b is (1-9):(1-9).

[0049] According to a preferred embodiment of the present invention, the organic material a with an absorption peak in the 500 to 800 nanometer wavelength range is selected from PC. 61 BM, PC 71 BM, C 60 C 70 ICBA, Bis-PC 61 BM, F-PC 61 One or more of BM, Y6, BTP-eC9, Y11, N3, and BTP-BO-4F.

[0050] Further preferably, the organic material a with an absorption peak in the 500 to 800 nanometer wavelength range is selected from PC. 71 BM, Bis-PC 61 BM or F-PC 61 BM.

[0051] According to a preferred embodiment of the present invention, the organic material b with an absorption peak located in the 300 to 500 nanometer band is selected from one or more of D18, D18-Cl, PCDTBT, PM6, P3HT, and PTB7-Th.

[0052] Further preferably, the organic material b with the absorption peak located in the 300 to 500 nanometer band is selected from one or more of D18-Cl, P3HT or PTB7-Th.

[0053] According to a preferred embodiment of the present invention, the mass ratio of organic material a to organic material b is (5-9):(1-5).

[0054] According to a preferred embodiment of the present invention, the mass ratio of organic material a to organic material b is 9:1.

[0055] According to a preferred embodiment of the present invention, the transparent substrate is ultrathin glass or PET.

[0056] The second objective of this invention is to provide a method for preparing the aforementioned blue light blocking LED filter film.

[0057] The preparation method of the above-mentioned blue light blocking LED filter film includes the following steps:

[0058] (1) Preparation of mixed solution: Dissolve organic material a with absorption peak in the 500 to 800 nm band in a solvent to obtain solution a, dissolve organic material b with absorption peak in the 300 to 500 nm band in a solvent to obtain solution b, mix solution a and solution b to obtain mixed solution;

[0059] (2) The mixed solution is coated on the substrate surface and dried to obtain a blue light blocking LED filter film.

[0060] According to a preferred embodiment of the present invention, in step (1), the organic material a with an absorption peak located in the 500 to 800 nanometer wavelength range is selected from PC. 61 BM, PC 71 BM, C 60 C 70 ICBA, Bis-PC 61 BM, F-PC 61 One or more of BM, Y6, BTP-eC9, Y11, N3, and BTP-BO-4F.

[0061] Further preferably, the organic material a with an absorption peak in the 500 to 800 nanometer wavelength range is selected from PC. 71 BM, Bis-PC 61 BM or F-PC 61 BM.

[0062] According to a preferred embodiment of the present invention, in step (1), the organic material b with an absorption peak located in the 300 to 500 nanometer band is selected from one or more of D18, D18-Cl, PCDTBT, PM6, P3HT, and PTB7-Th.

[0063] Further preferably, the organic material b with the absorption peak located in the 300 to 500 nanometer band is selected from one or more of D18-Cl, P3HT or PTB7-Th.

[0064] According to a preferred embodiment of the present invention, in step (1), the solvent is chloroform or chlorobenzene.

[0065] According to a preferred embodiment of the present invention, in step (1), the mass ratio of organic material a to organic material b is (1-9):(1-9).

[0066] More preferably, the mass ratio of organic material a to organic material b is (5-9):(1-5).

[0067] The most preferred ratio is 9:1 for organic material a to organic material b.

[0068] According to a preferred embodiment of the present invention, in step (1), the concentration of organic material a in solution a is 8-12 mg / mL, and the concentration of organic material b in solution b is 8-12 mg / mL.

[0069] According to a preferred embodiment of the present invention, in step (2), before coating, the transparent substrate is ultrasonically cleaned sequentially with a cleaning agent, deionized water, acetone, anhydrous ethanol and isopropanol, dried with nitrogen, and then treated with UV for 5-30 min.

[0070] The blue light blocking LED filter film prepared by this invention is used to optimize the spectrum of LED light sources in order to improve the eye protection capability and color rendering index of LED light sources.

[0071] The beneficial effects of this invention are as follows:

[0072] This invention selects organic material a with absorption peaks in the 500-800 nm wavelength range and organic material b with absorption peaks in the 300-500 nm wavelength range. The synergistic effect of organic materials a and b in the spectrum allows organic material b to balance the blue light absorption of organic material a in the LED spectrum, reducing the proportion of blue light in the transmission spectrum and improving the color balance of the LED light source. Currently, it can increase the maximum blue light exposure time of the LED light source by 19.5%, thanks to the absorption of blue light by organic material a. This reduces the threat of blue light to the human eye during human-lamp interaction, providing guidance for the large-scale commercial application of anti-blue light LED filter films in photobiological safety. Simultaneously, the anti-blue light LED filter film improves the color rendering index (CRI) of the LED light source, increasing it from 86 to 89.6. This allows the LED light source to be used in applications with higher CRI requirements (such as classrooms and bedrooms), broadening the sales range of LED light sources. Furthermore, the anti-blue light LED filter film is not adsorbed onto the LED light source, making it a replaceable material and extending the lifespan of the LED light source. Attached Figure Description

[0073] Figure 1 Theoretical calculation data on the effect of blue light blocking LED filter films with different ratios of organic material b to organic material a on LED light sources;

[0074] Figure 2 CIE 1931 chromaticity diagrams for thin films with different ratios of organic material b to organic material a;

[0075] Figure 3 TM-30-18 color vector graphics for different thin films;

[0076] Figure 4 D18:PC for different ratios of organic material b to organic material a 71 Normalized absorption spectrum of BM thin film. Detailed Implementation

[0077] The present invention will be further defined below with reference to the accompanying drawings and embodiments, but is not limited thereto.

[0078] Example 1

[0079] A method for preparing a blue light blocking LED filter film, comprising the following steps:

[0080] (1) Preparation of mixed solution: Add D18 to chloroform, stir at 95℃ for 10 min, then stir at 55℃ for 2 h to obtain D18 solution (the concentration of D18 in D18 solution is 10 mg / mL), and add PC 71 BM was added to chloroform and stirred at 45°C for 2 hours to obtain PC. 71 BM solution (PC) 71 PC in BM solution 71 The concentration of BM was 10 mg / mL, and then the D18 solution and PC were added. 71 BM solution mixing, PC 71 The mass ratio of BM to D18 is 9:1. Stir for 2 hours to obtain a mixed solution. (2) Clean the substrate sequentially with cleaning agent, deionized water, acetone, anhydrous ethanol and isopropanol, and blow it dry with nitrogen. Then treat it with UV for 15 minutes. Under nitrogen atmosphere, spin coat the mixed solution on the transparent substrate at a speed of 3000 rpm for 30 seconds. Dry it to obtain the blue light blocking LED filter film.

[0081] Example 2

[0082] The method for preparing a blue light blocking LED filter film is the same as described in Example 1, except that:

[0083] In step (1), PC 71 The mass ratio of BM to D18 was 5:5, and other procedures were carried out as in Example 1.

[0084] Example 3

[0085] The method for preparing a blue light blocking LED filter film is the same as described in Example 1, except that:

[0086] In step (1), PC 71 The mass ratio of BM to D18 was 7:3, and other procedures were carried out as in Example 1.

[0087] Comparative Example 1

[0088] The method for preparing a blue light blocking LED filter film is the same as described in Example 1, except that:

[0089] In step (1), PC 71The mass ratio of BM to D18 was 1:9, and other procedures were carried out as in Example 1.

[0090] Comparative Example 2

[0091] The method for preparing a blue light blocking LED filter film is the same as described in Example 1, except that:

[0092] In step (1), PC 71 The mass ratio of BM to D18 was 3:7, and other procedures were carried out as in Example 1.

[0093] Experimental example:

[0094] The impact of blue light hazards from LED light sources is assessed through the maximum exposure time (t). B Evaluate.

[0095] The maximum exposure time for blue light hazards t B Evaluation method: The transmission spectrum of the organic photovoltaic thin film was tested to obtain the spectral power distribution function of the LED after the film's action. t was then calculated using the following formula. B :

[0096]

[0097] In the formula, Let λ be the spectral power distribution function of the light source radiation, and B(λ) be the weighting function for blue light hazard.

[0098] In order to make t B To make a comparison under uniform illuminance, it is necessary to calculate the illuminance transmitted through the light source by the LED. Then normalize it to 300 LUX and calculate it using the following formula. :

[0099]

[0100] In the formula, Let V(λ) be the spectral power distribution function of the light source radiation, V(λ) be the photopic spectral luminous efficiency function, and K be the spectral power distribution function of the light source radiation. m The maximum spectral luminous efficiency is 683 lumens per watt, and A is the illuminated area (square meters).

[0101] The results show that: PC 71 The blue light hazard efficacy t was obtained by varying the ratio of BM to organic material b from 1:9, 3:7, 5:5, 7:3, and 9:1. B The corresponding changes, with PC 71 With the increase of the BM addition ratio, the t of the material system B All increased. From t B From the perspective of PC 71 The higher the BM ratio, the better.

[0102] D18:PC 71 For example, when BM=1:9, when PC 71 When BM is added at 90%, D18:PC 71 BM (the most significant change) t B It increased by 19.5%, and the CRI rose to 89.6.

[0103] All material systems after the addition of organic material a, t B Both increased, indicating that PC 71 The introduction of BM organic material a effectively improved t B This reduces the risk of blue light hazard after the LED light source is activated; and the addition of organic material b in the mixed solution increases the color rendering function of the LED light source compared to the original LED light source.

[0104] Figure 4 D18:PC with different organic material b-organic material a ratios in Examples 1-3 and Comparative Examples 1-2 71 Normalized transmission spectrum of BM thin film.

[0105] D18 in Examples 1-3 and Comparative Examples 1-2 is used to balance PC. 71 BM absorbs blue light from the LED spectrum, reducing the proportion of blue light in the transmission spectrum while improving the color balance of the LED light source. Specifically, D18 and PC... 71 BM is added to the heterojunction thin film material, through PC 71 BM exhibits excellent light absorption in the 400-500 nm range, with the addition of PC 71 After BM, the proportion of blue light in the transmission spectrum decreases, while the absorption of D18 at 582-584 nm balances other chromaticity values ​​in the LED light source spectrum, enabling the LED light source to achieve higher blue light protection and color rendering index.

[0106] Figure 1 Theoretical calculation data on the effect of blue light blocking LED filter films with different ratios of organic material b to organic material a on LED light sources; Figure 2 CIE 1931 chromaticity diagrams for thin films with different ratios of organic material b to organic material a; Figure 3 TM-30-18 color vector graphics for different thin films.

[0107] Experimental results show that PC 71 The increased proportion of organic materials (a) in BM improves the transmission light source of LEDs. B Both increased significantly, indicating that this strategy can effectively reduce the harmful effects of blue light, and the applicable systems include: D18:PC 61 BM, D18:PC 71 BM, D18:F-PC71 BM, PM6:Bis-PC 61 BM, P3HT:Bis-PC 61 BM, D18-CL:Bis-PC 61 BM, D18-Cl:C 60 And D18:ICBA.

Claims

1. A blue light blocking LED filter membrane, comprising a transparent substrate and a filter film layer disposed on the surface of the transparent substrate, wherein the filter film layer is prepared by organic material a with an absorption peak in the 500 to 800 nanometer band and organic material b with an absorption peak in the 300 to 500 nanometer band, and the mass ratio of organic material a to organic material b is (1-9):(1-9).

2. The blue light blocking LED filter membrane according to claim 1, characterized in that, Organic materials with absorption peaks in the 500 to 800 nanometer wavelength range, a, are selected from PC. 61 BM, PC 71 BM, C 60 C 70 ICBA, Bis-PC 61 BM, F-PC 61 One or more of BM, Y6, BTP-eC9, Y11, N3, and BTP-BO-4F.

3. The blue light blocking LED filter membrane according to claim 1, characterized in that, Organic materials with absorption peaks in the 500 to 800 nanometer wavelength range, a, are selected from PC. 71 BM, Bis-PC 61 BM or F-PC 61 BM.

4. The blue light blocking LED filter membrane according to claim 1, characterized in that, Organic materials b with absorption peaks in the 300 to 500 nanometer band are selected from one or more of D18, D18-Cl, PCDTBT, PM6, P3HT, and PTB7-Th.

5. The blue light blocking LED filter membrane according to claim 1, characterized in that, Organic materials b with absorption peaks in the 300 to 500 nanometer band are selected from one or more of D18-Cl, P3HT or PTB7-Th.

6. The blue light blocking LED filter membrane according to claim 1, characterized in that, The mass ratio of organic material a to organic material b is 9:1, and the transparent substrate is ultra-thin glass or PET.

7. The method for preparing the blue light blocking LED filter film according to claim 1, comprising the following steps: (1) Preparation of mixed solution: Dissolve organic material a with absorption peak in the 500 to 800 nm band in a solvent to obtain solution a, dissolve organic material b with absorption peak in the 300 to 500 nm band in a solvent to obtain solution b, mix solution a and solution b to obtain mixed solution; (2) The mixed solution is coated on the substrate surface and dried to obtain a blue light blocking LED filter film.

8. The preparation method according to claim 7, characterized in that, In step (1), the organic material a with an absorption peak in the 500 to 800 nanometer wavelength range is selected from PC. 61 BM, PC 71 BM, C 60 C 70 ICBA, Bis-PC 61 BM, F-PC 61 Organic materials b, selected from one or more of BM, Y6, BTP-eC9, Y11, N3, and BTP-BO-4F, with absorption peaks in the 300 to 500 nanometer wavelength range, are selected from one or more of D18, D18-Cl, PCDTBT, PM6, P3HT, and PTB7-Th.

9. The preparation method according to claim 7, characterized in that, In step (1), the solvent is chloroform or chlorobenzene, the mass ratio of organic material a to organic material b is (1-9):(1-9), the concentration of organic material a in solution a is 8-12 mg / mL, and the concentration of organic material b in solution b is 8-12 mg / mL.

10. The preparation method according to claim 7, characterized in that, In step (2), before coating, the transparent substrate is ultrasonically cleaned in sequence with cleaning agent, deionized water, acetone, anhydrous ethanol and isopropanol, dried with nitrogen, and then treated with UV for 5-30 min.

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