Organic metal light-absorbing material, filter film and display device

Abstract

The invention relates to an organic metal light-absorbing material, a filter film and a display device, the organic metal light-absorbing material is selected from at least one of structures shown in a formula (1): # imgabs0 #, R1 to R8 are independently selected from hydrogen atoms, alkyl groups with the carbon atom number of 1-20, alkoxy groups with the carbon atom number of 1-10, alkylthio groups with the carbon atom number of 1-10 or groups containing an aromatic structure, and R1 to R8 are independently selected from hydrogen atoms, alkyl groups with the carbon atom number of 1-20, alkoxy groups with the carbon atom number of 1-10, alkyl groups with the carbon atom number of 1-10 or groups containing an aromatic structure; m is selected from divalent metal atoms; the range of the maximum absorption wavelength of the organic metal light absorption material is 575 nanometers to 625 nanometers. The manufacturing cost of the display device can be reduced while the display contrast of the display device is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an organic metal light-absorbing material, a filter film and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) display devices are mostly used outdoors or indoors with natural light. In a strong ambient light atmosphere, the OLED screen will produce reflections, resulting in a significant decrease in display effect and contrast. Therefore, a layer of circular polarizer (POL) is usually added to the OLED display device to reduce the light reflectivity. The principle of reducing light reflectivity is: after the light enters the polarizer, it becomes vertically polarized light. After the polarized light is reflected by the internal film layer of the display device, it becomes horizontally polarized light and cannot pass through the polarizer. Therefore, this part of the light will not be reflected into the human eye, thereby reducing the light reflectivity on the OLED screen. However, since the transmittance of the polarizer is usually only about 43%, the introduction of the polarizer will reduce the brightness of the OLED screen. In addition, the thickness of the polarizer is large (>50μm), and the texture is brittle and not conducive to bending, which has become a major obstacle to its application in folding screens. In addition, the film material of the polarizer is expensive, which is not conducive to large-scale preparation. Therefore, the introduction of the polarizer affects the light output efficiency of the OLED display device and increases the cost.

[0003] Currently, polarizer-free technology (POL-less) is used to solve the problems caused by polarizers, which is beneficial to improve the display contrast. One of the technical solutions for POL-less is to coat a color filter (CF) on the OLED device, that is, the R / G / B color film on the color filter only transmits light of the same color as the pixel, and other light (including incident light and reflected light) will be absorbed, thereby improving the display contrast. However, if the above-mentioned color filter is made by photolithography to achieve POL-less, the cost of at least 4-5 masks needs to be increased, which will also lead to a significant increase in the cost of OLED display devices. Summary of the invention

[0004] The embodiments of the present application provide an organic metal light-absorbing material, a filter film and a display device, which can improve the display contrast of the display device while reducing the manufacturing cost of the display device.

[0005] In order to achieve the above object, according to the first aspect of the present application, an organic metal light absorbing material is provided, wherein the organic metal light absorbing material is selected from at least one of the structures shown in formula (1):

[0006]

[0007] Among them, R 1 -R 8 Each is independently selected from a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkylthio group having 1 to 10 carbon atoms, or a group containing an aromatic structure;

[0008] M is selected from divalent metal atoms;

[0009] The maximum absorption wavelength of the organic metal light-absorbing material is in the range of 575 nanometers to 625 nanometers.

[0010] In some embodiments, the M is selected from any one of magnesium, manganese, cobalt, nickel, copper, zinc, palladium and lead.

[0011] In some embodiments, the R 1 -R 8 Each is independently selected from a hydrogen atom, an alkyl group having 4 to 20 carbon atoms, an alkoxy group having 4 to 10 carbon atoms, an alkylthio group having 4 to 10 carbon atoms, or a group containing an aromatic structure.

[0012] In some embodiments, the absorption half-peak width of the organic metal light absorbing material is less than 50 nanometers.

[0013] In some embodiments, the R 1 is selected from a hydrogen atom, said R 2 Selected from tert-butyl.

[0014] In some embodiments, the organic metal light absorbing material is selected from at least one of the structures represented by Formula A to Formula D:

[0015]

[0016]

[0017] In some embodiments, the organic metal light absorbing material is selected from at least one of the structures represented by Formula I to Formula VII and the isomers of these structures:

[0018]

[0019] According to a second aspect of the present application, a filter film is provided, wherein the material of the filter film includes the organic metal light-absorbing material described above.

[0020] In some embodiments, in the filter film, the mass fraction of the organic metal light absorbing material ranges from 0.2% to 10%.

[0021] According to a third aspect of the present application, a display device is further provided, comprising a display module and the above-mentioned filter film, wherein the filter film is located on a light-emitting side of the display module.

[0022] In the organic metal light absorbing material, the filter film and the display device of the embodiment of the present application, the organic metal light absorbing material is an organic metal light absorbing dye based on porphyrin, and the maximum absorption wavelength of the organic metal light absorbing material ranges from 575 nanometers to 625 nanometers. The light absorbing properties of the organic metal light absorbing material can be adjusted by adjusting the central metal atom M of the organic metal light absorbing material shown in formula (1), so that the organic metal light absorbing material can selectively absorb the wavelength band between red light (R) and green light (G) (for example, the wavelength band near 585 nanometers); the peripheral substituent groups (R 1 -R 8 ), can avoid the problems of material aggregation, reduced solubility and reduced light absorption performance caused by excessively high molecular planarity. Therefore, the organic metal light-absorbing material provided by the present application is applied to the filter film material, which can at least absorb the wavelength band between red light and green light, and allow red, green and blue light to pass through, so that it can replace the conventional color filter to realize the non-polarizer technology, which is beneficial to save the mask cost and simplify the film material preparation process, so as to improve the display contrast of the display device while reducing the production cost of the display device.

[0023] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0025] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0026] Figure 1 It is a normalized UV-visible absorption spectrum of the structure represented by Formula I provided in the examples of the present application and one of its isomers.

[0027] Figure 2 It is a normalized UV-visible absorption spectrum of the structure represented by Formula I provided in the examples of the present application.

[0028] Figure 3It is a normalized UV-visible absorption spectrum of the structure represented by Formula II provided in the examples of the present application.

[0029] Figure 4 It is a normalized UV-visible absorption spectrum of the structure represented by Formula IV provided in the examples of the present application.

[0030] Figure 5 It is a normalized UV-visible absorption spectrum of the structure represented by Formula V provided in the examples of the present application.

[0031] Figure 6 It is a structural schematic diagram of a display device provided in an embodiment of the present application.

[0032] Explanation of the accompanying drawings: 1. display device; 2. display module; 3. filter film. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0034] Polaroid-less technology is used to solve the problems caused by polarizers, which is beneficial to improve display contrast. Usually, a color filter (CF) is used to replace the polarizer on the light-emitting side of the display device to achieve the effect of reducing light reflectivity, thereby improving the display contrast of the display device and solving the technical problem that the introduction of polarizers affects the light-emitting efficiency of the display device and increases the cost.

[0035] Since 4-5 masks are required to perform photolithography process to obtain a film with RGB color resistance during the CF production process, the production cost of CF is relatively high. In order to further reduce the cost, an alternative to CF is to add a layer of organic dye film as a filter film on the light-emitting side of the display device. The organic dye film can absorb visible light other than RGB and only transmit RGB light, thereby improving the light reflectivity of the display surface of the display device and improving the display contrast of the display device. This technology can reduce the cost of masks and simplify the preparation process of display devices. In order to realize this technology, it is necessary to synthesize organic dyes that can absorb two bands between RG (about 585nm) and GB (about 490nm), and the absorption half-peak width (Full Width at Half Maxima, FWHM) must be within 50nm to reduce the absorption of R / G / B and ensure color purity.

[0036] Porphyrin-type organic metal dyes are a class of dyes with good stability and strong light absorption ability. Among them, porphyrin has relatively weak absorption in the visible light region (Q band), while phthalocyanine has strong absorption in the red light region due to its larger conjugated structure. However, tetraazaporphyrin (Tetraazaporphyrin or Porphyrazine), as a substructure of phthalocyanine, has a smaller π conjugated system and strong absorption in the 570nm-600nm band (yellow-orange visible light), so it can be used as a potential demand material in the film material of POL-less technology.

[0037] The present application provides an organic metal light absorbing material, wherein the organic metal light absorbing material is selected from at least one of the structures shown in formula (1):

[0038]

[0039] Among them, R 1 -R 8 Each is independently selected from a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkylthio group having 1 to 10 carbon atoms, or a group containing an aromatic structure;

[0040] M is selected from divalent metal atoms;

[0041] The maximum absorption wavelength of the organic metal light-absorbing material is in the range of 575 nanometers to 625 nanometers.

[0042] In the embodiment of the present application, the organic metal light absorbing material is an organic metal dye based on porphyrin, and the maximum absorption wavelength of the organic metal light absorbing material is in the range of 575 nanometers to 625 nanometers. The light absorption performance of the organic metal light absorbing material can be adjusted by adjusting the central metal atom M of the organic metal light absorbing material shown in formula (1), so that the organic metal light absorbing material can selectively absorb the wavelength band between red light (R) and green light (G) (for example, the wavelength band near 585 nanometers); the peripheral substituent groups (R 1 -R 8 ), can avoid the problems of material aggregation, reduced solubility and reduced light absorption performance caused by excessively high molecular planarity. Therefore, the organic metal light-absorbing material provided by the present application is applied to the filter film material, which can at least absorb the wavelength band between red light and green light, and allow red, green and blue light to pass through, so that it can replace the conventional color filter to realize the non-polarizer technology, which is beneficial to save the mask cost and simplify the film material preparation process, so as to improve the display contrast of the display device while reducing the production cost of the display device.

[0043] In some embodiments, the M is selected from any one of magnesium (Mg), manganese (Mn), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), palladium (Pd) and lead (Pb).

[0044] The difference of metal atoms mainly lies in the difference of atomic radius and outermost electron number, so different metal atoms will affect the electron cloud distribution of dye molecules. For example, the metal atoms of Co, Ni, Cu and Zn are continuous in atomic number, and their 3d orbital electron number increases by 1 successively, so the absorption position of the obtained dye to light waves will also have a certain continuous change (for example, increase successively). Therefore, by adjusting the central metal atom M of the organic metal light absorbing material shown in formula (1), the light absorption performance of the organic metal light absorbing material can be adjusted. For example, by adjusting the central metal atom M, the maximum absorption wavelength (λmax) and the absorption half-maximum width (FWHM) of the organic metal light absorbing material can be adjusted, so that the organic metal light absorbing material can selectively absorb the band between red light (R) and green light (G) (for example, the band near 585 nanometers) and allow red light (R), green light (G) and blue light (B) to pass through.

[0045] In some embodiments, the maximum absorption wavelength of the organic metal light absorbing material is in the range of 580 nanometers to 600 nanometers.

[0046] In a specific embodiment, the maximum absorption wavelength of the organic metal light absorbing material is 585 nanometers, but is not limited thereto.

[0047] In some embodiments, the absorption half-width of the organic metal light-absorbing material is less than 50 nanometers, which can reduce the absorption of red (R), green (G), and blue (B) light. When the organic metal light-absorbing material is used instead of CF on the light-emitting side of the display device, the color purity can be improved, which is beneficial to improving the display effect.

[0048] In some embodiments, the R 1 -R 8 Each independently selected from a hydrogen atom, an alkyl group having 4 to 20 carbon atoms, an alkoxy group having 4 to 10 carbon atoms, an alkylthio group having 4 to 10 carbon atoms or a group containing an aromatic structure can avoid problems such as material aggregation, decreased solubility and decreased light absorption performance caused by excessive molecular planarity of the organic metal light-absorbing material shown in formula (1).

[0049] In some embodiments, R 1 -R 8 is a steric hindering group, which can prevent the molecular planarity of the organic metal light-absorbing material shown in formula (1) from being too high. 1 -R 8 It can also be a solubilizing group, for example, when R 1 -R8 When the carbon chain is longer and the number of carbon atoms is greater than or equal to 4, the organic metal light-absorbing material becomes lipophilic and is easy to dissolve in organic solvents, thereby increasing the solubility.

[0050] In some embodiments, the organic metal light absorbing material is selected from at least one of the structures represented by Formula A to Formula D:

[0051]

[0052] Understandably, when M, R 1 and R 2 When selected, the four structures represented by formula A to formula D are isomers of each other. Since these isomers are only R 1 and R 2 There are isomers between them, so the absorption peak positions of these isomers for light waves are basically the same and they can be mixed and used.

[0053] In some embodiments, the four structures represented by Formula A to Formula D can be obtained in the same synthesis process.

[0054] In a specific embodiment, the present application provides a method for preparing the organic metal light-absorbing material, the preparation method comprising:

[0055] Adding a predetermined ratio of a dicyano precursor, a base, and an acetate or chloride salt of a metal M to an organic solvent to form a mixture;

[0056] Under a nitrogen atmosphere and a preset temperature, the mixture undergoes a reflux reaction to obtain the organic metal light-absorbing material.

[0057] In some embodiments, the base is selected from an inorganic base or an organic base, the inorganic base is selected from at least one of sodium hydroxide, potassium hydroxide and cesium carbonate, and the organic base is selected from at least one of lithium tert-butoxide, sodium tert-butoxide, potassium tert-butoxide, 1,5-diazabicyclo [4.3.0] non-5-ene (DBN, CAS No. 3001-72-7) and 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU, CAS No. 6674-22-2).

[0058] When the base is solid, the amount of the base added to the mixture is 100% to 200% of the mass of the dicyano precursor, preferably 100% to 150%; when the base is liquid, the amount of the base added to the mixture is 2% to 20% of the volume of the solvent, preferably 5% to 10%.

[0059] For example, when the base is solid, in the mixture, the amount of the base added is 100%, 110%, 120%, 130%, 140%, 150%, 160%, 170%, 180%, 190% or 200% of the mass of the dicyano precursor, but not limited thereto. When the base is liquid, in the mixture, the amount of the base added is 2%, 5%, 8%, 10%, 12%, 15%, 18% or 20% of the volume of the solvent, but not limited thereto.

[0060] In some embodiments, the solvent is selected from organic alcohols having carbon atoms of 4 to 10. In a specific embodiment, the solvent is selected from at least one of n-butanol, n-pentanol and n-hexanol.

[0061] In some embodiments, in the mixture, the molar ratio of the acetate or chloride salt of the metal M to the dicyanogen precursor is in a range of 1:1 to 1:4.

[0062] In a specific embodiment, in the mixture, the molar ratio of the acetate or chloride salt of the metal M to the dicyanogen precursor is in the range of 1:2 to 1:4.

[0063] For example, in the mixture, the molar ratio of the acetate or chloride salt of the metal M to the dicyanogen precursor may be 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5 or 1:4, but is not limited thereto.

[0064] In some embodiments, the preset temperature ranges from 130°C to 170°C. For example, the preset temperature is 130°C, 135°C, 140°C, 145°C, 150°C, 155°C, 160°C, 165°C or 170°C, but is not limited thereto.

[0065] In some embodiments, the time length of the mixture reflux reaction ranges from 6 hours (h) to 24 hours. For example, the time length of the mixture reflux reaction is 6h, 8h, 10h, 12h, 14h, 16h, 18h, 20h or 24h, but is not limited thereto.

[0066] In some embodiments, the dicyano precursor has a structural formula as shown in formula (2),

[0067]

[0068] In a specific embodiment, the mixture contains only one dicyano precursor, and a mixture of the four structures represented by the above formula A to formula D is synthesized by the above preparation method.

[0069] It should be noted that if two or more dicyano precursors are used as reactants, more isomeric products can be obtained, providing more possibilities for adjusting the optical properties of organic metal light-absorbing materials; however, a large number of dicyano precursors will lead to problems such as a wide variety of products, low yield of a single isomer, and difficulty in separation, so a single dicyano precursor is preferably used as a reactant.

[0070] It is understandable that the product obtained by the above preparation method contains different isomers. Since the isomers are difficult to separate and have similar absorption spectra, the product is purified and collected in the form of a mixture. In other words, only impurities other than the above isomers are removed during the purification process, and there is no need to purify a single isomer.

[0071] In some embodiments, the R 1 is selected from a hydrogen atom, said R 2 Selected from tert-butyl.

[0072] In a specific embodiment, the organic metal light absorbing material is selected from at least one of the structures shown in Formula I to Formula VII and the isomers of these structures:

[0073]

[0074]

[0075] It can be understood that the general formula of the structures shown in Formula I to Formula VII is selected from the structure represented by Formula D, and the general formula of the isomers of the structures shown in Formula I to Formula VII is selected from the structures represented by Formula A, Formula B and Formula C.

[0076] The present application also describes the specific preparation process of seven organic metal light-absorbing materials represented by Formula I to Formula VII through specific examples, and tests the optical properties of these seven organic metal light-absorbing materials.

[0077] Example 1

[0078] The synthesis process of the structure represented by formula I and its isomers is as follows:

[0079] 2-tert-Butylmaleonitrile (CAS No. 169309-80-2, 30 mmol), cupric chloride (CAS No. 7447-39-4, 15 mmol) and DBU (2.7 ml) are added to n-pentanol (CAS No. 71-41-0, 50 ml), and the obtained mixture is vacuum degassed and then filled with nitrogen, and the process is repeated three times; the mixture is stirred and reacted at 170° C. for 24 hours under a nitrogen atmosphere; after the reaction is completed, the mixture is cooled to room temperature, and the solvent is removed by reduced pressure distillation to obtain a crude product; the crude product is purified by silica gel column chromatography, and then the solution is concentrated to obtain a crude product; finally, dichloromethane and methanol are used for recrystallization, and a blue-purple solid powder product is obtained after reduced pressure filtration and vacuum drying, with a yield of 28%. The results of mass spectrometry analysis and elemental analysis of the structure represented by Formula I and its isomers are: Mass Spec. m / z=600.3; Elem. Anal. C: 63.88, H: 6.95, N: 18.82.

[0080] It is understandable that the product contains different isomers, but the isomers are difficult to separate and have similar absorption spectra, so the product is purified and collected as a mixture. In addition, since the molecular formula of isomers of the same material is the same, their mass spectrometry analysis and elemental analysis structures are the same.

[0081] Specifically, the product obtained in Example 1 includes the structure represented by Formula I and the following three isomers:

[0082]

[0083] The normalized UV-visible absorption spectra of the structure represented by Formula I and one of its isomers are shown in Figure 1 As shown, and the normalized UV-visible absorption spectrum of the structure represented by Formula I is as shown Figure 2 As shown. Figure 1 and Figure 2 It can be seen that the maximum absorption wavelength of the structure represented by Formula I and its isomers are basically consistent, and the maximum absorption wavelength is at about 585 nm.

[0084] Example 2

[0085] The synthesis process of the structure represented by formula II and its isomers is as follows:

[0086] The synthesis method and the amount of each reactant are the same as those in Example 1, except that the copper chloride in the reactant is replaced by cobalt acetate (CAS No. 71-48-7). The obtained product is a dark purple solid powder with a yield of 32%. The mass spectrometry analysis and elemental analysis results of the structure represented by Formula II and its isomers are: Mass Spec.m / z=596.3; Elem.Anal.C:64.38, H:6.82, N:18.98.

[0087] The normalized UV-visible absorption spectrum of the structure represented by Formula II is shown in Figure 3 As shown. Figure 3 It can be seen that the maximum absorption wavelength of the structure represented by Formula II is at about 575 nm.

[0088] Example 3

[0089] The synthesis process of the structure represented by formula III and its isomers is as follows:

[0090] The synthesis method and the amount of each reactant are the same as those in Example 1, except that the copper chloride in the reactant is replaced by magnesium acetate (CAS No. 142-72-3). The obtained product is a blue-purple solid powder with a yield of 33%. The mass spectrometry analysis and elemental analysis results of the structure represented by Formula III and its isomers are: Mass Spec.m / z=561.3; Elem.Anal.C:68.35, H:7.33, N:20.09.

[0091] It was measured that the maximum absorption wavelength of the structure represented by Formula III is at about 594 nm.

[0092] Example 4

[0093] The synthesis process of the structure represented by formula IV and its isomers is as follows:

[0094] The synthesis method and the amount of each reactant are the same as those in Example 1, except that the cupric chloride in the reactant is replaced by nickel acetate tetrahydrate (CAS No. 6018-89-9). The obtained product is a blue-green solid powder with a yield of 16%. The mass spectrometry analysis and elemental analysis results of the structure represented by Formula IV and its isomers are: Mass Spec.m / z=595.3; Elem.Anal.C:64.44, H:6.87, N:18.91.

[0095] The normalized UV-visible absorption spectrum of the structure represented by Formula IV is shown in Figure 4 As shown. Figure 4 It can be seen that the maximum absorption wavelength of the structure represented by Formula IV is at about 582 nm.

[0096] Example 5

[0097] The synthesis process of the structure represented by formula V and its isomers is as follows:

[0098] The synthesis method and the amount of each reactant are the same as those in Example 1, except that the copper chloride in the reactant is replaced by anhydrous zinc acetate (CAS No. 557-34-6). The obtained product is a dark blue solid powder with a yield of 16%. The mass spectrometry analysis and elemental analysis results of the structure represented by Formula V and its isomers are: Mass Spec.m / z=601.3; Elem.Anal.C:64.00, H:6.85, N:18.71.

[0099] The normalized UV-visible absorption spectrum of the structure represented by Formula V is shown in Figure 5 As shown. Figure 5 It can be seen that the maximum absorption wavelength of the structure represented by Formula V is at about 595 nm.

[0100] Example 6

[0101] The synthesis process of the structure represented by formula VI and its isomers is as follows:

[0102] The synthesis method and the amount of each reactant are the same as those in Example 1, except that the copper chloride in the reactant is replaced by lead acetate trihydrate (CAS No. 6080-56-4). The obtained product is a dark green solid powder with a yield of 26%. The mass spectrometry analysis and elemental analysis results of the structure represented by Formula VI and its isomers are: Mass Spec.m / z=745.3; Elem.Anal.C:51.83, H:5.56, N:15.20.

[0103] It was measured that the maximum absorption wavelength of the structure represented by Formula VI is at about 624 nm.

[0104] Example 7

[0105] The synthesis process of the structure represented by formula VII and its isomers is as follows:

[0106] The synthesis method and the amount of each reactant are the same as those in Example 1, except that the copper chloride in the reactant is replaced by palladium acetate (CAS No. 3375-31-3). The obtained product is a dark green solid powder with a yield of 35%. The mass spectrometry analysis and elemental analysis results of the structure represented by Formula VII and its isomers are: Mass Spec.m / z=643.2; Elem.Anal.C:59.69, H:6.41, N:17.5.

[0107] It was measured that the maximum absorption wavelength of the structure represented by Formula VII is at about 576 nm.

[0108] The seven products provided in Examples 1 to 7 were respectively made into thin films and their optical properties were tested.

[0109] The method for preparing the film corresponding to Example 1 includes:

[0110] The product provided in Example 1 was added to acrylic UV (ultraviolet light) curing glue at a content of 0.2wt% to 10.0wt%, and after coating, leveling, heat baking and UV curing treatment, a bluish purple film was obtained.

[0111] It can be understood that the films corresponding to Examples 2 to 7 are also obtained by the above-mentioned preparation method.

[0112] The present embodiment uses an ultraviolet visible spectrophotometer (instrument model Shimidzu UV-1800) to test the seven films corresponding to Examples 1 to 7 to obtain the ultraviolet visible absorption spectra and transmittance (Transmissivity) of the seven films respectively. According to the ultraviolet visible absorption spectra, the maximum absorption wavelength (λmax) and the absorption half-peak width (FWHM) of the seven materials can be obtained. At the same time, the present embodiment also tests the haze (Haze) of the seven films. The test results of the maximum absorption wavelength, absorption half-peak width, transmittance and haze of the seven films corresponding to Examples 1 to 7 are shown in Table 1.

[0113] Table 1

[0114] Example <![CDATA[λ max (nm)]]> FWHM(nm) T(％) Haze(%) 1 585 25 75.32 1.34 2 575 38 59.83 1.28 3 594 24 75.32 1.34 4 582 29 68.62 1.21 5 595 25 66.91 0.99 6 624 24 70.21 1.02 7 576 36 71.88 1.40

[0115] As shown in Table 1, the maximum absorption wavelength of the structures shown in Formula I to Formula VII and the isomers of these structures is between 575nm and 625nm, and the absorption half-peak width of these materials is less than 40nm, indicating that the structures shown in Formula I to Formula VII and the isomers of these structures can selectively absorb the band between red light (R) and green light (G) when used as organic metal light absorbing materials in the filter film, and can reduce the absorption of RGB three-color light, which is beneficial to improve color purity. In addition, as shown in Table 1, the thin film formed by the structures shown in Formula I to Formula VII and the isomers of these structures has a high light transmittance and a low haze, so that the structures shown in Formula I to Formula VII and the isomers of these structures will not affect the light extraction efficiency of the display device when used as organic metal light absorbing materials in the filter film.

[0116] It is understandable that the light absorption properties of the organic metal light absorbing material can be adjusted by selecting a suitable central metal atom M, so that the organic metal light absorbing material can selectively absorb the wavelength band between red light (R) and green light (G). Since different types of light emitting devices emit different wavelengths of the same color of light, those skilled in the art can select a suitable organic metal light absorbing material according to the structure of the light emitting device to achieve the purpose of absorbing the wavelength band between red light (R) and green light (G).

[0117] In the embodiment of the present application, the organic metal light absorbing material is an organic metal light absorbing dye based on tetrazopyrin. By adjusting the central metal atom M of the organic metal light absorbing material shown in formula (1), the light absorbing performance of the organic metal light absorbing material can be adjusted, so that the organic metal light absorbing material can selectively absorb the wavelength band (575 nanometers to 625 nanometers) between red light (R) and green light (G), and the absorption half-peak width of the organic metal light absorbing material is less than 50 nanometers, which can reduce the absorption of red (R), green (G) and blue (B) tricolor light; in addition, by adjusting the peripheral substituent groups (R) of the organic metal light absorbing material shown in formula (1), the absorption of the organic metal light absorbing material can be reduced. 1 -R 8 ), which can avoid material aggregation, decreased solubility and decreased light absorption performance caused by excessively high molecular planarity. Therefore, when the organic metal light-absorbing material provided by the present application is applied to the filter film material, it can absorb the wavelength band between red light and green light, and allow red, green and blue light to be transmitted, so that it can replace the conventional color filter on the basis of ensuring color purity to realize polarizer-less technology (POL-less), which is beneficial to saving mask costs and simplifying the film material preparation process, so that the display contrast of the display device can be improved while reducing the production cost of the display device.

[0118] The present application also provides a filter film, wherein the material of the filter film includes at least one of the organic metal light absorbing materials described in the above embodiments. The organic metal light absorbing material is used to absorb the wavelength band between red light (R) and green light (G) (for example, the wavelength band near 585nm).

[0119] In some embodiments, in the filter film, the mass fraction of the organic metal light absorbing material ranges from 0.2% to 10%.

[0120] For example, in the filter film, the mass fraction of the organic metal light-absorbing material is 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5% or 10%.

[0121] In some embodiments, the material of the filter film further includes other light-absorbing materials, and the other light-absorbing materials are used to absorb the wavelength band (about 490 nm) between green light (G) and blue light (B).

[0122] In a specific embodiment, the other light absorbing materials include organic metal light absorbing dyes based on methylene dipyrrole, but are not limited thereto.

[0123] In the embodiments of the present application, since the organic metal light-absorbing material in the filter film can at least absorb the wavelength band between red light and green light and allow red, green and blue light to be transmitted, it can replace the conventional color filter while ensuring color purity to realize polarizer-less technology (POL-less), which is beneficial to saving mask costs and simplifying the film material preparation process, thereby reducing the production cost of the display device while improving the display contrast of the display device.

[0124] like Figure 6 As shown, an embodiment of the present application further provides a display device 1 , which includes a display module 2 and the filter film 3 described in the above embodiment, wherein the filter film 3 is located at the light emitting side of the display module 2 .

[0125] In some embodiments, the light emitting device in the display module 2 includes an OLED or an LED, but is not limited thereto.

[0126] In the embodiment of the present application, since the organic metal light-absorbing material in the filter film can at least absorb the wavelength band between red light and green light and allow red, green and blue light to be transmitted, it can replace the conventional color filter to achieve polarizer-less technology (POL-less) while ensuring color purity, which is beneficial to saving mask costs and simplifying the film material preparation process, thereby improving the display contrast of the display device 1 while reducing the production cost of the display device.

[0127] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0128] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0129] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0130] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. An organic metal light-absorbing material, characterized in that: The organic metal light-absorbing material is selected from at least one of the structures shown in formula (1): Among them, R 1 -R 8 Each is independently selected from a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkylthio group having 1 to 10 carbon atoms, or a group containing an aromatic structure; M is selected from divalent metal atoms; The maximum absorption wavelength of the organic metal light-absorbing material is in the range of 575 nanometers to 625 nanometers.

2. The organic metal light-absorbing material according to claim 1, characterized in that: The M is selected from any one of magnesium, manganese, cobalt, nickel, copper, zinc, palladium and lead.

3. The organic metal light-absorbing material according to claim 1, characterized in that: The R 1 -R 8 Each is independently selected from a hydrogen atom, an alkyl group having 4 to 20 carbon atoms, an alkoxy group having 4 to 10 carbon atoms, an alkylthio group having 4 to 10 carbon atoms, or a group containing an aromatic structure.

4. The organic metal light-absorbing material according to claim 1, characterized in that: The absorption half-peak width of the organic metal light-absorbing material is less than 50 nanometers.

5. The organic metal light-absorbing material according to claim 1, characterized in that: The R 1 is selected from hydrogen atoms, said R 2 Selected from tert-butyl.

6. The organic metal light-absorbing material according to any one of claims 1 to 5, characterized in that: The organic metal light-absorbing material is selected from at least one of the structures represented by Formula A to Formula D:

7. The organic metal light-absorbing material according to any one of claims 1 to 5, characterized in that: The organic metal light-absorbing material is selected from at least one of the structures represented by Formula I to Formula VII and the isomers of these structures:

8. A filter film, characterized in that: The material of the filter film includes the organic metal light-absorbing material according to any one of claims 1 to 7.

9. The filter film according to claim 8, characterized in that: In the filter film, the mass fraction of the organic metal light absorbing material ranges from 0.2% to 10%.

10. A display device, characterized in that: It comprises a display module and the filter film as claimed in claim 9, wherein the filter film is located on the light-emitting side of the display module.

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