CN115505152A - Film for absorbing blue light green light and preparation method and application thereof - Google Patents

Film for absorbing blue light green light and preparation method and application thereof Download PDF

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CN115505152A
CN115505152A CN202110695344.9A CN202110695344A CN115505152A CN 115505152 A CN115505152 A CN 115505152A CN 202110695344 A CN202110695344 A CN 202110695344A CN 115505152 A CN115505152 A CN 115505152A
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green
light
film
blue
films
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王国杰
施克炜
谷至华
韩晓麟
扈继超
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Taihu Jinzhang Technology Co ltd
University of Science and Technology Beijing USTB
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Taihu Jinzhang Technology Co ltd
University of Science and Technology Beijing USTB
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
    • C08J2325/04—Homopolymers or copolymers of styrene
    • C08J2325/06—Polystyrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
    • C08J2433/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/3009—Sulfides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/28—Nitrogen-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds

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Abstract

The application relates to a film for absorbing blue green light and a preparation method and application thereof, in particular to a film for absorbing blue green light, which comprises a substrate and a light conversion layer coated on the substrate, wherein the light conversion layer is formed by a suspension liquid containing modified green fluorescent powder and resin, the mass ratio of the modified green fluorescent powder to the resin is 0.2-5:1, and the substrate is selected from one or more of the following materials: polyethylene terephthalate films, polypropylene films, polyester aluminized films, backlight module reflectors, polyethylene films, polystyrene films, polyimide films, and polyethylene naphthalate films.

Description

Film for absorbing blue light green light and preparation method and application thereof
Technical Field
The invention belongs to the technical field of luminescence and display, and relates to a film for absorbing blue light green light, and a preparation method and application thereof.
Background
In recent years, gallium nitride Light Emitting Diode (LED) light sources are widely used in backlight modules of display screens of computers, mobile phones, televisions, and the like, white light is mainly formed by mixing blue light emission of gallium nitride and yellow phosphor light emission excited by blue light, and such white light components usually contain a high proportion of blue light. Such high intensity blue light not only damages human eyesight, but also seriously affects human biological clock, even accelerates human aging and causes brain cell damage, etc. Therefore, research on blue light prevention display devices has received increasing attention in recent years.
At present, the mechanism of preventing blue light of display devices such as mobile phones, tablet computers, notebook computers, desktop computers and the like is to separate 15-25% of high-energy blue light with the wavelength of 440-470nm in a reflection mode, so that the display devices have a certain optical protection effect on eyes of viewers. However, this mechanism is a waste of backlight energy in terms of efficiency of light source energy utilization.
Although the film which absorbs blue light and emits red light can effectively reduce the blue light and increase the intensity of long-wavelength red light, the intensity of green light cannot be improved, and the effect of improving the brightness of a display device is not obvious.
Disclosure of Invention
In order to solve the problems of blue light harm brought by a display device and low energy utilization rate of a backlight source caused by the existing blue light prevention technology, the invention provides a film for absorbing blue light green light, a preparation method and application thereof, so that the optical performance of a backlight module structure is improved and enhanced, and comfortable display is realized. The film for absorbing the blue light green light can enhance the green light intensity of the display device and effectively improve the brightness of the display device. The film which absorbs blue light and emits green light is arranged in a backlight module of the display, and the blue light is converted into the green light through a light conversion technology. The optical performance of the film can be regulated and controlled by regulating the blending ratio of the fluorescent powder and the polymer resin so as to realize healthy and comfortable display. The technology can effectively reduce harmful high-energy blue light emitted by the backlight source, reduce the visual and non-visual damage of the blue light to human bodies and realize healthy display while not changing the original backlight module structure; secondly, the film converts high-energy harmful blue light into green light through light conversion, so that the color coordinate under a white field is improved, and comfortable display is realized; moreover, the blue light absorbing and green light emitting film adopts a light conversion technology, so that the light energy is utilized to the maximum extent, and the energy conservation and environmental protection are realized.
In a first aspect, the present application provides a film that absorbs blue-emitted green light, comprising a substrate and a light conversion layer coated on the substrate, the light conversion layer being formed from a suspension containing a modified green phosphor and a resin.
In some embodiments, the substrate is selected from one or more of the following: polyethylene terephthalate films, polypropylene films, polyester aluminized films, backlight module reflectors, polyethylene films, polystyrene films, polyimide films, and polyethylene naphthalate films.
The light conversion layer is an organic thin film, and the organic thin film can be formed by a suspension which can contain modified green fluorescent powder, resin and a solvent.
In some embodiments, the mass ratio of the modified green phosphor to the resin is from 0.2 to 5:1, for example from 0.3 to 3.
In some embodiments, the green phosphor is selected from one or more of the following: phosphate green phosphor, sulfide green phosphor, nitride green phosphor, aluminate green phosphor, and borate green phosphor. In some preferred embodiments, the green phosphor is a nitride green phosphor. In some preferred embodiments, the green phosphor is a sulfide green phosphor.
In some embodiments, the modified green phosphor is a silane coupling agent modified green phosphor. The silane coupling agent may be selected from one or more of the following: gamma-glycidoxypropyltrimethoxysilane, (methacryloyloxy) propyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, N- (beta-aminoethyl) -alpha-aminopropyltrimethoxysilane, and 3-glycidoxypropyltrimethoxysilane.
In some embodiments, the resin is selected from one or more of the following: polyvinylidene fluoride, polycarbonate, polystyrene, polyimide, acrylic resin, epoxy resin, polymethyl methacrylate and polyvinyl acetate.
In some embodiments, the solvent is selected from one or more of the following: n, N-dimethylformamide, dimethyl sulfoxide, dichloromethane, chloroform, N-hexane, toluene, dimethylacetamide, ethyl acetate, and N-methylpyrrolidone. In some embodiments, the solvent is 20-80% by weight of the suspension, such as 30-70%,40-70%, 50-65%, etc.
In a second aspect, the present application provides a method of making a blue-emitting green light absorbing thin film. Firstly, the fluorescent powder is subjected to modification pretreatment operation, the modified fluorescent powder and different polymer resins are uniformly blended to form a precursor, and a substrate is coated to form a film for absorbing blue light green light.
The method may include: s1, modifying fluorescent powder; s2, mixing the modified fluorescent powder with resin to form a suspension; and S3, coating to form a film.
In some embodiments, the method of making a blue-green light absorbing thin film comprises:
s1, modifying green fluorescent powder by using a silane coupling agent to obtain modified green fluorescent powder;
s2, mixing the modified green fluorescent powder with resin according to the mass ratio of 0.2-5:1 to obtain a suspension containing the modified green fluorescent powder and the resin; and
and S3, coating the turbid liquid on a substrate and drying to obtain the film for absorbing blue light green light.
S1 step
In some embodiments, the S1 step comprises:
(1) Dispersing green fluorescent powder and a silane coupling agent in toluene to obtain a solution, and heating the solution to 60-90 ℃ to react for 5-10 hours;
(2) Cooling the heated solution, centrifuging and discarding the supernatant; and
(3) And washing and drying to modify the green fluorescent powder.
In the step (1), the silane coupling agent may account for 0.3-5% by mass of the solution.
In step (2), the centrifugation may be carried out at 5000 to 8000 r/min. In some embodiments, the centrifugation is performed for 5-10min.
The washing of step (3) is performed to remove the silane coupling agent which has not completely reacted. In some embodiments, the washing may be a centrifugation wash. In some embodiments, the washing may be performed with toluene. In some embodiments, the washing may be performed 2-3 times.
In step (3), the drying may be performed at 80 to 100 ℃.
In some embodiments, the green phosphor is selected from one or more of the following: phosphate green phosphor, sulfide green phosphor, nitride green phosphor, aluminate green phosphor, and borate green phosphor. In some preferred embodiments, the green phosphor is a nitride green phosphor. In some preferred embodiments, the green phosphor is a sulfide green phosphor.
In some embodiments, the silane coupling agent may be selected from one or more of the following: gamma-glycidoxypropyltrimethoxysilane, (methacryloyloxy) propyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, N- (beta-aminoethyl) -alpha-aminopropyltrimethoxysilane, and 3-glycidoxypropyltrimethoxysilane.
S2 step
In the S2 step, the mass ratio of the modified green phosphor to the resin may be 0.2 to 5:1, for example, 0.3 to 3, 1,0.4 to 1:1, for example, 0.2.
In some embodiments, the resin is selected from one or more of the following: polyvinylidene fluoride, polycarbonate, polystyrene, polyimide, acrylic resin, epoxy resin, polymethyl methacrylate and polyvinyl acetate.
In some embodiments, the suspension may include a modified green phosphor, a resin, and a solvent. In some embodiments, the mass ratio of the modified green phosphor to the resin is 0.2 to 5:1, such as 0.3 to 3, 1,0.4 to 1:1, for example, 0.2. In some embodiments, the solvent is selected from one or more of the following: n, N-dimethylformamide, dimethylsulfoxide, dichloromethane, chloroform, N-hexane, toluene, dimethylacetamide, ethyl acetate, and N-methylpyrrolidone. In some embodiments, the solvent is 20-80% by weight of the suspension, such as 30-70%,40-70%, 50-65%, etc.
S3 step
In some embodiments, the substrate is selected from one or more of the following: polyethylene terephthalate films, polypropylene films, polyester aluminized films, backlight module reflectors, polyethylene films, polystyrene films, polyimide films, and polyethylene naphthalate films.
In some embodiments, the coating in the S3 step is selected from any one of knife coating, roll coating, spray coating, dipping, casting, and spin coating. In some embodiments, the coating comprises uniformly dropping the suspension onto a substrate and forming a film using a coater (e.g., a nip extrusion coater). In some embodiments, the blade height used in the coating is 0.1mm to 0.2mm, such as 0.12mm,0.14mm, and the like.
In some embodiments, the drying in step S3 is performed at 100-120 ℃ for 1-20 minutes.
In a third aspect, the present application provides a backlight module for a display comprising a blue-emitting green light absorbing film as described herein.
In some embodiments, the backlight module of the display comprises an LED light bar, a light guide plate, a reflective sheet, an upper diffusion film, a lower diffusion film and a brightness enhancement film. In some embodiments, a blue-green light absorbing film as described herein is positioned below a light guide plate.
In a fourth aspect, the present application provides a use of the film for absorbing blue green light for improving the light emitting performance of a backlight module.
In some embodiments, the improved light emission properties comprise: a reduction in the blue band, an enhancement in the green band, an increase in brightness, a warming of the hue and/or an improvement in the white field color coordinates, etc.
The invention has the advantages that the blue light absorbing and green light emitting film is arranged in the backlight module, the luminous performance of the backlight module is improved, the blue light can be effectively reduced, the eye health is protected, the blue light is converted into green light to be emitted, the white field color coordinate of the display device is improved, and the brightness of the display device can be improved; in addition, the blue light green light absorbing film does not change the original backlight module structure, and the preparation method has the advantages of simple process, easy operation and good application prospect.
Drawings
Fig. 1 is a diagram of an exemplary backlight module, which is mainly divided into an LED light bar, a light guide plate, a reflective sheet, an upper diffusion sheet, a lower diffusion sheet, and a brightness enhancement sheet.
FIG. 2 is a schematic diagram of the structure of an exemplary blue-absorbing green-emitting film made in accordance with the present invention.
FIG. 3 is an excitation spectrum (solid line) and an emission spectrum (dashed line) of an exemplary blue-absorbing green-emitting thin film made according to the present invention.
FIG. 4 is an emission spectrum of an exemplary blue-absorbing green-emitting film prepared according to the present invention placed in front of (solid line) and behind (dashed line) a backlight module of a display device.
FIG. 5 is a CIE coordinate diagram of an exemplary blue-light absorbing, green-light emitting film made in accordance with the present invention positioned in front of and behind a backlight module of a display device.
Detailed Description
The present invention will be further described with reference to the following examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. In addition, after reading the teaching of the present invention, those skilled in the art can make various changes or modifications to the invention, and these equivalents also fall within the scope of the claims appended to the present application. All reagents used in the examples were obtained commercially unless otherwise stated; the instruments and equipment used in the preparation and analytical tests are conventional instruments and equipment commonly used.
Example 1
Taking 5g of nitride green fluorescent powder, adding 40ml of toluene solution, uniformly mixing, dropwise adding N- (beta-aminoethyl) -alpha-aminopropyltrimethoxysilane to the mass fraction of 1%, and then heating to 70 ℃ for reaction for 7 hours; cooling to room temperature after the reaction is finished, centrifuging the modified mixed solution at the rotating speed of 6000r/min for 6min, taking out the mixed solution, pouring out supernatant, and washing the modified fluorescent powder with toluene for 3 times to remove the unreacted silane coupling agent; and drying the washed modified fluorescent powder in an oven at 80 ℃ for 12h to obtain the modified nitride green fluorescent powder. Dissolving 4g of acrylic resin in 10g of N, N-dimethylformamide, adding 3g of modified nitride green fluorescent powder, stirring until the fluorescent powder is uniformly dispersed, uniformly dropwise adding the suspension into a backlight module reflector plate (Lekei group Co., ltd., china), and forming a film by using a slit extrusion type coating machine (Shenzhen Shangxin automatic GmbH, precise coating machine GTB 800C), wherein the height of a scraper is 0.14mm; and after the coating process is finished, placing the film in a drying oven at 110 ℃ for 2min to dry the coating, thereby obtaining the blue light absorbing and green light emitting film.
FIG. 3 shows the excitation spectrum (solid line) and emission spectrum (dotted line) of the prepared blue-absorbing green-emitting thin film tested by a fluorescence spectrophotometer (Beijing Ji Tepu Lomb Biotechnology Co., ltd., model F-280).
The film is placed in a backlight module, the blue light wave band is reduced by 41.7%, the green light wave band is enhanced by 52.6%, and the brightness of a display device is improved by 25.7%. The data from the spectrofluorometer test were converted to color coordinate data by CIE1931 color coordinate calculation software, with the visible color coordinates moved from (0.25,0.27) to (0.28,0.36).
Fig. 4 is a luminescence spectrum of the prepared blue-light-absorbing green-light-emitting film placed in front of and behind a backlight module of a display device, which is tested by a spectrofluorometer (beijing Ji Tepu lun biotechnology ltd, model F-280), and fig. 5 is a CIE coordinate diagram of the prepared blue-light-absorbing green-light-emitting film placed in front of and behind the backlight module of the display device (data tested by the spectrofluorometer is converted into color coordinate data by CIE1931 color coordinate calculation software).
Example 2
Taking 5g of nitride green fluorescent powder, adding 40ml of toluene solution, uniformly mixing, dropwise adding N- (beta-aminoethyl) -alpha-aminopropyltrimethoxysilane to the mass fraction of 0.4%, heating to 70 ℃, and reacting for 7h; cooling to room temperature after the reaction is finished, centrifuging the modified mixed solution at the rotating speed of 6000r/min for 6min, taking out the mixed solution, pouring out supernatant, and washing the modified fluorescent powder with toluene for 3 times to remove the unreacted silane coupling agent; and drying the washed modified fluorescent powder in an oven at 80 ℃ for 10 hours to obtain the modified nitride green fluorescent powder. Dissolving 5g of acrylic resin in 10g of ethyl acetate, adding 2.5g of modified nitride green fluorescent powder, stirring until the fluorescent powder is uniformly dispersed, uniformly dropwise adding the suspension in a polyethylene terephthalate film (Sichuan Dongyo science and technology group, inc.), and forming a film by using a crack extrusion type coating machine (Shenzhen Shangxin automatic Inc., precision coating machine GTB 800C), wherein the height of a scraper is 0.14mm; and after the coating process is finished, placing the film in an oven at 110 ℃ for 2min to dry the coating, thereby obtaining the blue light absorbing and green light emitting film.
The film is placed in a backlight module, the blue light wave band is reduced by 30.5%, the green light wave band is enhanced by 31.8%, the brightness of the display device is improved by 14.7%, and the color coordinate is moved from (0.25,0.27) to (0.27,0.35).
Example 3
Taking 5g of sulfide green fluorescent powder, adding 40ml of toluene solution, uniformly mixing, dropwise adding gamma-glycidoxy trimethoxy silane until the mass fraction is 0.6%, dropwise adding acetic acid to adjust the pH value to 4, then heating to 70 ℃, and reacting for 7 hours; cooling to room temperature after the reaction is finished, centrifuging the modified mixed solution at the rotating speed of 6000r/min for 6min, taking out the mixed solution, pouring out supernatant, and washing the modified fluorescent powder with toluene for 3 times to remove the unreacted silane coupling agent; and drying the washed modified fluorescent powder in an oven at 80 ℃ for 12h to obtain the modified sulfide green fluorescent powder. Dissolving 4g of polymethyl methacrylate in 10g of dichloromethane, adding 1.5g of modified sulfide green fluorescent powder, stirring until the fluorescent powder is uniformly dispersed, uniformly dropwise adding the suspension into a polystyrene film (Sichuan Dongyao science and technology group, ltd.), and forming the film by using a crack extrusion type coating machine (Shenzhen Shangxin automatic GmbH, precision coating machine GTB 800C), wherein the height of a scraper is 0.12mm; and after the coating process is finished, placing the film in a drying oven at 110 ℃ for 2min to dry the coating, thereby obtaining the blue light absorbing and green light emitting film.
The film is placed in a backlight module, the blue light wave band is reduced by 23.4%, the green light wave band is enhanced by 17.6%, the brightness of the display device is improved by 6.8%, and the color coordinate is moved from (0.25,0.27) to (0.26,0.32).

Claims (10)

1. A film for absorbing blue-emitted green light, comprising a substrate and a light conversion layer coated on the substrate, wherein the light conversion layer is formed by a suspension liquid containing modified green fluorescent powder and resin, the mass ratio of the modified green fluorescent powder to the resin is 0.2-5:1, and the substrate is selected from one or more of the following materials: polyethylene terephthalate films, polypropylene films, polyester aluminized films, backlight module reflectors, polyethylene films, polystyrene films, polyimide films, and polyethylene naphthalate films.
2. The blue-emitting green absorbing film of claim 1, wherein the green phosphor is selected from one or more of the following: phosphate green phosphor, sulfide green phosphor, nitride green phosphor, aluminate green phosphor and borate green phosphor.
3. The film absorbing blue-light-emitted green light according to claim 1 or 2, wherein the modified green phosphor is a silane coupling agent-modified green phosphor.
4. The blue-emitting green light-absorbing film of claim 3, wherein the silane coupling agent is selected from one or more of the following: gamma-glycidoxypropyltrimethoxysilane, (methacryloyloxy) propyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, N- (beta-aminoethyl) -alpha-aminopropyltrimethoxysilane, and 3-glycidoxypropyltrimethoxysilane.
5. The blue-emitting green light-absorbing film of claim 1 or 2, wherein the resin is selected from one or more of the following: polyvinylidene fluoride, polycarbonate, polystyrene, polyimide, acrylic resin, epoxy resin, polymethyl methacrylate and polyvinyl acetate.
6. The blue-green light-absorbing film according to claim 1 or 2, wherein the solvent in the suspension is selected from one or more of the following: n, N-dimethylformamide, dimethyl sulfoxide, dichloromethane, chloroform, N-hexane, toluene, dimethylacetamide, ethyl acetate, and N-methylpyrrolidone.
7. A method of making a blue-green light absorbing thin film, comprising:
s1, modifying green fluorescent powder by using a silane coupling agent to obtain modified green fluorescent powder;
s2, mixing the modified green fluorescent powder with resin according to the mass ratio of 0.2-5:1 to obtain turbid liquid containing the modified green fluorescent powder and the resin; and
and S3, coating the turbid liquid on a substrate and drying to obtain the film for absorbing blue light green light.
8. The method of claim 7, wherein the S1 step comprises:
(1) Dispersing green fluorescent powder and a silane coupling agent in toluene to obtain a solution, and heating the solution to 60-90 ℃ for reaction for 5-10 hours;
(2) Cooling the heated solution, centrifuging and discarding the supernatant; and
(3) And washing and drying to modify the green fluorescent powder.
9. A backlight module of a display device comprising the film absorbing blue-light-emitted green light according to any one of claims 1 to 6.
10. Use of the blue-light green-absorbing thin film according to any one of claims 1 to 6 for improving the light emitting performance of a backlight unit of a display.
CN202110695344.9A 2021-06-23 2021-06-23 Film for absorbing blue light green light and preparation method and application thereof Pending CN115505152A (en)

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