Film-forming agent and preparation method therefor, color-conversion film and preparation method therefor, display module, and display device

Abstract

Embodiments of the present application relate to the technical field of display devices, and in particular to a film-forming agent and a preparation method therefor, a color-conversion film and a preparation method therefor, a display module, and a display device. The embodiments of the present application aim at solving the problems of incomplete curing of the color-conversion film and low resolution of the display module. The embodiments of the present application provide a film-forming agent, which is used for preparing a color-conversion film and comprises a first monomer, a first quantum dot, a first photosensitizer, and a first co-initiator, wherein the first quantum dot generates first fluorescence under the action of first light. The first quantum dots in the film-forming agent are uniformly distributed, and the penetrability of the generated first fluorescence is strong, such that the first photosensitizer and the first co-initiator can be fully triggered to generate free radicals and / or cations, so as to enable the first monomer to be fully subjected to a cross-linking reaction, and enable the color-conversion film to be completely cured, improving the resolution of the display module.

Description

Film-forming agent and preparation method thereof, color conversion film and preparation method thereof, display module and display device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on March 27, 2024, with application number 202410366367.9 and application name “A film-forming agent and its preparation method, a color conversion film and its preparation method, a display module and a display device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of display equipment, and in particular to a film-forming agent and a preparation method thereof, a color conversion film and a preparation method thereof, a display module and a display device. Background Art

[0003] A display module typically includes a backlight module and a color conversion film positioned on the light-emitting side of the backlight module. The color conversion film comprises a plate body and quantum dots doped within the plate body. During operation, the quantum dots emit light of a specific color under the illumination of the backlight, achieving a color display. During production, the raw materials are typically doped with quantum dots and then irradiated with ultraviolet light to cure the raw materials and form the color conversion film. However, this curing process can easily lead to incomplete curing of the raw materials, resulting in lower resolution for the display module. Summary of the Invention

[0004] The embodiments of the present application provide a film-forming agent and a preparation method thereof, a color conversion film and a preparation method thereof, a display module, and a display device, which can completely cure the color conversion film and provide a high resolution display module.

[0005] In a first aspect, embodiments of the present application provide a film-forming agent for preparing a color conversion film, comprising a first monomer and a first quantum dot, the first quantum dot being mixed with the first monomer and configured to emit a first fluorescent light when irradiated by a first light. The film-forming agent also includes a first photosensitizer and a first co-initiator, the first photosensitizer and the first co-initiator being configured to be triggered by the first fluorescent light to generate free radicals and / or cations, the free radicals and cations being used to promote the curing of the first monomer.

[0006] Through this arrangement, the first quantum dots generate a first fluorescence under the influence of the first light. This fluorescence triggers the first photosensitizer to produce free radicals and / or cations in conjunction with the first coinitiator. These free radicals and / or cations trigger a cross-linking reaction in the first monomer, forming a chemically cross-linked structure within the molecules of the first monomer, thereby curing the first monomer. The first quantum dots are evenly distributed within the film-forming agent, and the generated first fluorescence has strong penetrability, which can fully trigger the first photosensitizer and the first coinitiator to produce free radicals and / or cations, causing a thorough cross-linking reaction in the first monomer, completely curing the color conversion film and improving the resolution of the display module.

[0007] In some embodiments, which may include the above embodiments, the first monomer includes at least one of an epoxy-functional monomer and an acrylate-functional monomer.

[0008] In this configuration, the first monomer is selected from epoxy- and / or acrylate-containing monomers. The epoxy and acrylate groups can undergo polymerization under the action of free radicals and cations, resulting in crosslinking and curing of the first monomer. Furthermore, the first monomer increases the viscosity of the film-forming agent, increasing the thickness of the color conversion film. This improves the film's blue light absorption efficiency and reduces blue light leakage, eliminating the need for the addition of scattering particles to enhance the film's absorbance.

[0009] In some embodiments that may include the above embodiments, the first quantum dots include at least one of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, PbS, PbSe, PbTe, HgS, HgSe, HgTe, GaN, GaP, GaAs, InP, InAs, ZnO, SnO2, TiO2, MoO3, CuO, In2O3, Ga2O3, SiO2, NiO, WO3, Cu2O, Fe3O4, carbon dots, and perovskite compounds.

[0010] With such configuration, the material and size of the first quantum dots corresponding to the first fluorescence can be selected according to the requirements of the first fluorescence.

[0011] In some embodiments that may include the above embodiments, the first quantum dot includes a core structure and a shell structure wrapped around the core structure, the core structure includes a first nanocrystalline particle, and the shell structure includes a second nanocrystalline particle. The first nanocrystalline particle and the second nanocrystalline particle include at least one of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, PbS, PbSe, PbTe, HgS, HgSe, HgTe, GaN, GaP, GaAs, InP, InAs, ZnO, SnO2, TiO2, CuO, In2O3, Ga2O3, SiO2, NiO, MoO3, WO3, Cu2O, Fe3O4, carbon dots, and perovskite compounds.

[0012] With this arrangement, the shell structure is used to protect the core structure, improve the stability of the core structure, and avoid core structure reactions.

[0013] In some embodiments that may include the above-mentioned embodiments, the first photosensitizer includes at least one of triazine, oxime, benzoin ether, benzil ketal, bisimidazole, aromatic phosphine oxide, acridine dye, xanthene dye, thioxanthene dye, phenazine dye, phenoxazine dye, phenothiazine dye, tri(hetero)arylmethane dye (especially diamino and triamino(hetero)arylmethane dye), monomethine cyanine dye, dimethine cyanine dye, trimethine cyanine dye, pentamethine cyanine dye, semi-cyanine dye, external cationic part cyanine dye, external cationic neutral cyanine (Neutrocyanin) dye, zero methine dye (especially naphthylidene imide dye), and streptocyanin dye; the first co-initiator includes at least one of amine co-initiator, silane co-initiator, iodonium salt, and sulfonium salt.

[0014] In this configuration, the corresponding first photosensitizer and first co-initiator can be selected according to the color of the first fluorescence. The first photosensitizer can cooperate with the first co-initiator to generate cationic or free radical active species under the action of the first fluorescence, thereby initiating a polymerization reaction of the first monomer and promoting its curing.

[0015] In some embodiments that may include the above embodiments, the film-forming agent also includes a second photosensitizer, which is doped in the first monomer. The second photosensitizer is configured to trigger the generation of free radicals and / or cations under the action of the first light, thereby triggering a polymerization reaction of the first monomer and promoting its curing.

[0016] In some embodiments that may include the above embodiments, the second photosensitizer includes at least one of a chromophore-containing compound, a diazonium salt, a diaryliodonium salt, a triarylsulfonium salt, an alkylsulfonium salt, an iron arene salt, a sulfonyloxyketone, and a triarylsiloxane.

[0017] In this manner, the second photosensitizer increases the concentration of free radicals and cations generated in the film-forming agent, thereby allowing the first monomer to be completely cross-linked and cured.

[0018] In some embodiments that may include the above embodiments, the film-forming agent further includes a third photosensitizer, which is doped in the first quantum dots. The third photosensitizer is configured to trigger a CH insertion reaction under the action of the first light, thereby triggering a polymerization reaction between the first quantum dots and other components of the film-forming agent containing CH bonds, thereby promoting the curing of the film-forming agent.

[0019] In some embodiments including the above embodiments, the third photosensitizer includes at least one of an azide crosslinker, a diazo crosslinker, and a benzophenone crosslinker. An azide crosslinker is a molecule containing two or more azide functional groups, a diazo crosslinker is a molecule containing two or more diazo functional groups, and a benzophenone crosslinker is a molecule containing two or more benzophenone functional groups.

[0020] With this arrangement, the third photosensitizer triggers the carbon-hydrogen bond-containing molecules in the film-forming agent to react under the action of the first light, causing the first quantum dots in the film-forming agent to undergo carbon-hydrogen insertion reaction with other components, thereby completely curing the film-forming agent.

[0021] In some embodiments including the above embodiments, the film-forming agent further includes a thickener, the thickener is doped in the first monomer, and the thickener is used to increase the viscosity of the film-forming agent. The thickener includes a resin.

[0022] In this manner, the thickening agent can increase the viscosity of the film-forming agent, thereby accelerating the curing speed of the film-forming agent and increasing the thickness of the color conversion film, thereby improving the absorbance of the color conversion film.

[0023] In a second aspect, embodiments of the present application provide a method for preparing a film-forming agent, comprising: doping a first quantum dot, a first photosensitizer, a first co-initiator, a second photosensitizer, and a third photosensitizer into a first monomer. The first quantum dot is configured to excite a first fluorescence under irradiation by a first light, and the first photosensitizer and the first co-initiator are configured to be triggered by the first fluorescence to generate free radicals and / or cations, which are used to promote the curing of the first monomer.

[0024] Through the above-described configuration, the film-forming agent produced by the film-forming agent preparation method provided in the embodiments of the present application utilizes the first fluorescence generated by the first quantum dots under the influence of the first light. The first fluorescence can trigger the first photosensitizer to cooperate with the first co-initiator to produce free radicals and / or cations. The free radicals and / or cations can trigger a cross-linking reaction in the first monomer, causing the molecules within the first monomer to form a chemically cross-linked structure to achieve the curing of the first monomer. The first quantum dots are evenly distributed in the film-forming agent, and the generated first fluorescence has strong penetrability, which can fully trigger the first photosensitizer and the first co-initiator to produce free radicals and / or cations, causing a sufficient cross-linking reaction in the first monomer, completely curing the color conversion film, and improving the resolution of the display module.

[0025] In a third aspect, an embodiment of the present application provides a color conversion film, comprising a light-shielding layer and a film-forming agent, wherein an opening is provided on the light-shielding layer, and the film-forming agent is filled in the opening.

[0026] With this arrangement, the light shielding layer can prevent light in one sub-pixel region from entering an adjacent sub-pixel region, thereby avoiding crosstalk and improving the resolution and contrast of the display module.

[0027] In a fourth aspect, an embodiment of the present application provides a method for preparing a color conversion film, comprising: forming a light-shielding layer having an opening provided on the light-shielding layer; providing a film-forming agent and filling the film-forming agent in the opening; and irradiating the film-forming agent in the opening with a first light to solidify the film-forming agent.

[0028] Through the above arrangement, the color conversion film produced by the color conversion film preparation method provided in the embodiments of the present application can be manufactured with a light-shielding layer that prevents light from one sub-pixel from entering adjacent sub-pixels, thus preventing crosstalk and improving the resolution and contrast of the display module. Furthermore, the color conversion film preparation method provided in the embodiments of the present application has a limited number of steps, is simple to operate, and is amenable to large-scale industrial production.

[0029] In a fifth aspect, an embodiment of the present application provides a display module, comprising a backlight module and the above-mentioned color conversion film, wherein the color conversion film is arranged on the light-emitting side of the backlight module.

[0030] The display module provided in the embodiment of the present application includes the color conversion film in any of the above embodiments, so the two can solve the same technical problems and achieve the same technical effects.

[0031] In a sixth aspect, an embodiment of the present application provides a display device, comprising a housing and the above-mentioned display module, wherein the display module is disposed in the housing.

[0032] The display device provided in the embodiment of the present application includes the display module in any of the above embodiments, so the two can solve the same technical problems and achieve the same technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a schematic structural diagram of a display device provided in an embodiment of the present application;

[0034] FIG2 is a first structural diagram of a display module provided in an embodiment of the present application;

[0035] FIG3 is a second structural diagram of a display module provided in an embodiment of the present application;

[0036] FIG4 is a schematic diagram of a full-color display of a display module provided in an embodiment of the present application;

[0037] FIG5 is a schematic structural diagram of a color conversion film provided in an embodiment of the present application;

[0038] FIG6 is a schematic diagram of a film-forming agent provided in an embodiment of the present application;

[0039] FIG7 is a flow chart of a method for preparing a film-forming agent according to an embodiment of the present application;

[0040] FIG8 is a flow chart of a method for preparing a color conversion film according to an embodiment of the present application;

[0041] FIG9 is a schematic diagram of forming a light shielding layer;

[0042] FIG10 is a schematic diagram of filling the opening with a film-forming agent;

[0043] FIG11 is a schematic diagram of irradiating a first light beam onto a film-forming agent in an opening;

[0044] FIG12 is a first absorption curve diagram of a color conversion film provided in an embodiment of the present application;

[0045] FIG13 is a second absorption curve diagram of the color conversion film provided in an embodiment of the present application;

[0046] FIG14 is a first diagram showing the patterned effect of the color conversion film provided in an embodiment of the present application;

[0047] FIG15 is a second diagram showing the patterned effect of the color conversion film provided in an embodiment of the present application;

[0048] FIG16 is a third absorption curve diagram of the color conversion film provided in an embodiment of the present application;

[0049] FIG17 is a fourth absorption curve diagram of the color conversion film provided in an embodiment of the present application;

[0050] FIG18 is a fifth absorption curve diagram of the color conversion film provided in an embodiment of the present application;

[0051] FIG19 is a sixth absorption curve diagram of the color conversion film provided in an embodiment of the present application;

[0052] FIG. 20 is a seventh absorption curve diagram of the color conversion film provided in an embodiment of the present application.

[0053] Explanation of the accompanying drawings: 10: display device; 11: housing; 20: display module; 21: backlight module; 22: liquid crystal layer; 30: color conversion film; 301: pixel unit area; 31: light-shielding layer; 32: substrate; 33: covering mask; 331: through hole; 40: film-forming agent; 41: first quantum dot; 411: core structure; 412: shell structure. DETAILED DESCRIPTION

[0054] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0055] In the following, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features.

[0056] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the components in the drawings.

[0057] Referring to Figure 1, an embodiment of the present application provides a display device 10, comprising a housing 11 and a display module 20. The display module 20 is disposed in the housing 11 to implement the image display function of the display device 10. The housing 11 is used to support and fix the display module 20, and can protect and buffer the display module 20 and other functional structures inside the housing 11, so that the display module 20 can operate normally. It is understood that the display device 10 may include electronic products with display functions such as smart watches, mobile phones, tablets, AR glasses, VR glasses, etc., and the embodiment of the present application does not impose any specific restrictions on the display device 10.

[0058] Referring to FIG. 2 , an embodiment of the present application provides a display module 20 including a backlight module 21 and a color conversion film 30. The color conversion film 30 is disposed on the light-emitting side of the backlight module 21, and the backlight module 21 provides backlight to the color conversion film 30. The backlight module 21 may include a light-emitting diode (LED), a sub-millimeter light-emitting diode (Mini-LED), a micro-LED (Micro-LED), a quantum dot light-emitting diode (QLED), or an organic light-emitting diode (OLED). The embodiment of the present application does not impose any specific limitations on the backlight module 21.

[0059] Exemplarily, the backlight module 21 can provide blue backlight, and accordingly, the color conversion film 30 may include a plurality of pixel unit areas 301 arranged in an array, and each pixel unit area 301 may include a red sub-pixel area, a green sub-pixel area, and a blue sub-pixel area arranged at intervals. The blue sub-pixel area is usually a transparent area. After the backlight is irradiated on the red sub-pixel area, the red sub-pixel area can convert the blue backlight into red light and emit it in a direction away from the backlight module; similarly, after the backlight is irradiated on the green sub-pixel area, the green sub-pixel area can convert the blue backlight into green light and emit it in a direction away from the backlight module 21; when the backlight is irradiated on the blue sub-pixel area, the blue light can directly pass through the blue sub-pixel area, so that the full-color display of the display module 20 can be achieved.

[0060] It can be understood that in the display module 20 provided in the embodiment of the present application, the backlight emitted by the backlight module 21 is not limited to blue, and the backlight emitted by the backlight module 21 can also be white light or light of other colors; taking the backlight emitted by the backlight module 21 as white light as an example, after the backlight is irradiated on the red sub-pixel area, the red sub-pixel area can convert the white backlight into red light and emit it in a direction away from the backlight module 21; after the backlight is irradiated on the green sub-pixel area, the green sub-pixel area can convert the white backlight into green light and emit it in a direction away from the backlight module 21; after the backlight is irradiated on the blue sub-pixel area, the blue sub-pixel area can convert the white backlight into blue light and emit it in a direction away from the backlight module 21, so that full-color display of the display module 20 can also be achieved.

[0061] Referring to FIG. 3 , in some embodiments, the display module 20 may include a liquid crystal display (LCD) panel. Accordingly, the display module 20 further includes a liquid crystal layer 22 . The liquid crystal layer 22 is disposed between the color conversion film 30 and the backlight module 21 . The liquid crystal layer 22 may control the amount of backlight received by each sub-pixel region in each pixel unit region 301 , thereby achieving color display (as shown in FIG. 4 ).

[0062] Continuing with reference to Figure 3, in other embodiments, the display module 20 may include an LED, and correspondingly, the backlight module 21 includes a plurality of light-emitting diodes arranged in an array, each of which may correspond to a sub-pixel area. By controlling the light-emitting diodes to emit light, the corresponding sub-pixel area can be controlled to emit light, so that the corresponding pixel unit area 301 emits the color light corresponding to the sub-pixel area, thereby achieving color display.

[0063] The embodiment of the present application does not limit the type of the display module 20. For example, the display module 20 may also be miniLED, MicroLED, OLED, etc.

[0064] Referring to Figure 5 , the color conversion film 30 provided in an embodiment of the present application includes a light-shielding layer 31 and a film-forming agent 40. The light-shielding layer 31 is provided with openings filled with the film-forming agent 40. It will be appreciated that each opening corresponds to a sub-pixel region. The light-shielding layer 31 prevents light from one sub-pixel region from entering an adjacent sub-pixel region, thereby preventing crosstalk and improving the resolution and contrast of the display module 20 (as shown in Figure 4 ). In some embodiments, the color conversion film 30 further includes a substrate 32 , on which the light-shielding layer 31 is disposed. The substrate 32 supports the light-shielding layer 31, providing protection and a buffering effect.

[0065] Thus, the color conversion film 30 provided in the embodiment of the present application can avoid backlight loss through the light shielding layer 31 , prevent light in one sub-pixel area from entering an adjacent sub-pixel area, avoid crosstalk, and improve the resolution and contrast of the display module 20 .

[0066] Referring to FIG6 , an embodiment of the present application also provides a film-forming agent 40 for preparing the color conversion film 30 (as shown in FIG5 ). The film-forming agent 40 includes a first monomer and a first quantum dot 41. The first quantum dot 41 is mixed with the first monomer. The first quantum dot 41 is a semiconductor material having a diameter between 2 nm and 10 nm (10-50 atoms). The first quantum dot 41 is configured to excite a first fluorescence when irradiated by a first light. The first monomer can undergo a polymerization reaction under the action of free radicals and / or cations. The first monomer and the first quantum dot can also undergo a C-H insertion reaction and cross-linking polymerization, thereby promoting the curing of the film-forming agent 40. It is understood that the first light includes ultraviolet light. Exemplarily, the first light can be ultraviolet light with a wavelength of 365 nm, 254 nm, or 195 nm. The first fluorescence includes visible light. Exemplarily, the first fluorescence can include any one of red, green, and yellow light.

[0067] The film-forming agent 40 also includes a first photosensitizer and a first co-initiator. The first photosensitizer and the first co-initiator are doped within the first monomer and are configured to be triggered by the first fluorescence to generate free radicals and / or cations. The free radicals and cations are used to promote the curing of the first monomer. The first photosensitizer includes a visible light free radical initiator, a visible light cationic initiator, or a blend of the two, and can generate free radicals and / or cations in response to the first fluorescence. The first co-initiator includes a free radical co-initiator, a cationic co-initiator, or a blend of the two, and can cooperate with the first photosensitizer to generate free radicals and / or cations.

[0068] In some embodiments, the first photosensitizer includes a visible light free radical initiator, the first co-initiator includes a free radical co-initiator, the first photosensitizer and the first co-initiator cooperate to generate free radicals under the action of the first fluorescence, and the free radicals initiate cross-linking and curing of the first monomer.

[0069] In some embodiments, the first photosensitizer includes a visible light cationic initiator, the first co-initiator includes a cationic co-initiator, and the first photosensitizer and the first co-initiator cooperate to generate cations under the action of the first fluorescence, and the cations initiate cross-linking and curing of the first monomer.

[0070] In some embodiments, the first photosensitizer includes a visible light free radical initiator and a visible light cationic initiator, and the first co-initiator includes a free radical co-initiator and a cationic co-initiator. The first photosensitizer and the first co-initiator cooperate to generate free radicals and cations under the action of the first fluorescence, and the free radicals and cations initiate the cross-linking and curing of the first monomer.

[0071] The film-forming agent 40 provided in the present embodiment includes a first monomer, first quantum dots 41, a first photosensitizer, and a first co-initiator. The first quantum dots 41 emit a first fluorescence under the influence of a first light. The first fluorescence can trigger the first photosensitizer to produce free radicals and / or cations in conjunction with the first co-initiator. The free radicals and / or cations can trigger a cross-linking reaction in the first monomer, forming a chemically cross-linked structure within the molecules of the first monomer to achieve curing of the first monomer. The first quantum dots 41 are evenly distributed in the film-forming agent 40, and the generated first fluorescence has strong penetrability, which can fully trigger the first photosensitizer and the first co-initiator to produce free radicals and / or cations, causing a sufficient cross-linking reaction in the first monomer, completely curing the color conversion film 30, and improving the resolution of the display module 20.

[0072] In some implementations, the first monomer includes at least one of an epoxy-functional monomer and an acrylate-functional monomer. It is understood that the first monomer may include an epoxy monomer, an acrylate monomer, or a combination of an epoxy monomer and an acrylate monomer. For example, the first monomer may be an epoxy monomer 2021P, an acrylate monomer EM221, or a mixture of an epoxy monomer 2021P and an acrylate monomer EM221.

[0073] In this manner, the first monomer is selected from monomers containing epoxy and / or acrylate functional groups. The epoxy and acrylate functional groups can undergo a polymerization reaction under the action of free radicals and cations, resulting in the curing of the first monomer. Furthermore, the first monomer increases the viscosity of the film-forming agent 40, thereby increasing the thickness of the color conversion film 30. This improves the blue light absorption efficiency of the color conversion film 30 and reduces blue light leakage, eliminating the need for the addition of scattering particles to enhance the absorbance of the color conversion film 30.

[0074] In some implementations, the first quantum dots 41 include cadmium sulfide (CdS), cadmium selenide (CdSe), cadmium telluride (CdTe), zinc sulfide (ZnS), zinc selenide (ZnSe), zinc telluride (ZnTe), lead sulfide (PbS), lead selenide (PbSe), lead telluride (PbTe), mercury sulfide (HgS), mercury selenide (HgSe), mercury telluride (HgTe), gallium nitride (GaN), gallium phosphide (GaP), gallium arsenide (GaN), or the like. At least one of As), indium phosphide (InP), indium arsenide (InAs), zinc oxide (ZnO), tin oxide (SnO2), titanium oxide (TiO2), copper oxide (CuO), indium oxide (In2O3), gallium oxide (Ga2O3), silicon oxide (SiO2), nickel oxide (NiO), molybdenum oxide (MoO3), tungsten oxide (WO3), cuprous oxide (Cu2O), iron oxide (Fe3O4), carbon dots, and perovskite compounds.

[0075] The first fluorescence is related to the size of the first quantum dot 41. For example, in an embodiment where the first quantum dot 41 is CdSe, when the first quantum dot 41 is [4nm-5nm], the excited first fluorescence is green light; when the first quantum dot 41 is [7nm-9nm], the excited first fluorescence is red light. It is understandable that to excite first fluorescences of different colors, the materials of the first quantum dots 41 can be the same or different. For example, the first fluorescence excited by the first quantum dot 41 using InP can be red light, and the first fluorescence excited by the first quantum dot 41 using CdSe can be green light. It is understandable that in an embodiment where the first quantum dot 41 includes a plurality of the above materials, the first quantum dot 41 can use a gradient mixture of the above materials, that is, the mixing ratios of the materials used in the first quantum dot 41 are different.

[0076] In the implementation mode where the backlight emitted by the backlight module is white light and the film-forming agent 40 is used in the blue sub-pixel area, the first quantum dot 41 is selected to have a diameter and material corresponding to the first fluorescent light excited to be blue light;

[0077] In the implementation mode where the film-forming agent 40 is used in the green sub-pixel region, the first quantum dot 41 is selected to have a diameter and material corresponding to the first fluorescent light excited to be green;

[0078] In the implementation mode in which the film-forming agent 40 is used in the red sub-pixel region, the first quantum dot 41 is selected to have a diameter and material corresponding to the first fluorescent light excited to be red light.

[0079] Continuing with FIG6 , in some implementations, first quantum dot 41 includes a core structure 411 and a shell structure 412 encapsulating core structure 411. Core structure 411 includes first nanocrystalline particles, and shell structure 412 includes second nanocrystalline particles. It is understood that core structure 411 has poor stability, and shell structure 412 is used to protect and improve the stability of core structure 411 and prevent core structure 411 from reacting.

[0080] In some implementations, the first nanocrystalline particles and the second nanocrystalline particles include at least one of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, PbS, PbSe, PbTe, HgS, HgSe, HgTe, GaN, GaP, GaAs, InP, InAs, ZnO, SnO2, TiO2, CuO, SiO2, In2O3, Ga2O3, NiO, MoO3, WO3, Cu2O, Fe3O4, carbon dots, and perovskite compounds. It will be understood that the nanocrystalline particles are crystalline structures formed at the nanoscale.

[0081] In some embodiments, the first photosensitizer includes at least one of triazine, oxime, benzoin ether, benzil ketal, bisimidazole, aromatic phosphine oxide, acridine dye, xanthene dye, thioxanthene dye, phenazine dye, phenoxazine dye, phenothiazine dye, tri(hetero)arylmethane dye (especially diamino and triamino(hetero)arylmethane dye), monomethine cyanine dye, dimethine cyanine dye, trimethine cyanine dye, pentamethine cyanine dye, hemicyanine dye, external cationic part cyanine dye, external cationic neutral cyanine (Neutrocyanin) dye, zero methine dye (especially naphthylidene imide dye), and streptocyanin dye; the first co-initiator includes at least one of amine co-initiator, silane co-initiator, iodonium salt, and sulfonium salt.

[0082] The first photosensitizer includes a visible light free radical initiator, a visible light cationic initiator, and a blend of the two. It is understood that when using first fluorescent light of different colors, it is necessary to select a first photosensitizer corresponding to the first fluorescent light. For example, in an embodiment where the first fluorescent light is red, the first photosensitizer is a red light photosensitizer; in an embodiment where the first fluorescent light is green, the first photosensitizer is a green light photosensitizer. It is understood that the first photosensitizers corresponding to the first fluorescent light of different colors can be made of the same material or different materials. For example, the red light photosensitizer can be new methylene blue, and the green light photosensitizer can be safranin O.

[0083] The first co-initiator includes a free radical co-initiator or a cationic co-initiator. It is understood that the first co-initiators corresponding to different colors of first fluorescence can be the same or different. For example, the first fluorescence is red light or green light, and the first co-initiator can be MDEA and iodonium salt DPI.PF6.

[0084] In this way, the corresponding first photosensitizer and first co-initiator can be selected according to the color of the first fluorescence. The first photosensitizer can cooperate with the first co-initiator to generate cations and / or free radicals under the action of the first fluorescence, thereby initiating a polymerization reaction of the first monomer and promoting its curing.

[0085] In some implementations, the mass percentage of the first monomer is [10%-60%], the mass percentage of the first quantum dot 41 is [1%-80%], the mass percentage of the first photosensitizer is (0%-1%], and the mass percentage of the first co-initiator is (0%-1%]. Exemplarily, the mass percentage of the first monomer can be 10%, 30%, 50%, or 60%; the mass percentage of the first quantum dot 41 can be 1%, 10%, 50%, or 80%; the mass percentage of the first photosensitizer can be 0.2%, 0.5%, or 1%; and the mass percentage of the first co-initiator can be 0.2%, 0.5%, or 1%.

[0086] In some implementations, the film-forming agent 40 further includes a second photosensitizer, which is doped in the first monomer. The second photosensitizer is configured to generate free radicals and / or cations under the action of the first light, thereby initiating a polymerization reaction of the first monomer and promoting its curing.

[0087] In this way, the second photosensitizer increases the concentration of free radicals and cations generated in the film-forming agent 40 , so that the first monomer is completely cross-linked and cured, and the film-forming agent 40 is completely cured.

[0088] In some implementations, the second photosensitizer includes at least one of a compound containing a chromophore (particularly a compound containing a carbonyl group attached to a benzene ring, such as benzoin and its derivatives, acetophenone derivatives, aromatic ketone compounds, and acylphosphine oxides), a diazonium salt, a diaryliodonium salt, a triarylsulfonium salt, an alkylsulfonium salt, an iron arene salt, a sulfonyloxyketone, and a triarylsiloxane. It is understood that the second photosensitizer may include a UV free radical initiator, a UV cationic initiator, or a blend of the two. UV free radical initiators include compounds containing a chromophore, particularly compounds containing a carbonyl group attached to a benzene ring, such as benzoin and its derivatives, acetophenone derivatives, aromatic ketone compounds, and acylphosphine oxides; UV cationic initiators include diazonium salts, diaryliodonium salts, triarylsulfonium salts, alkylsulfonium salts, iron arene salts, sulfonyloxyketones, and triarylsiloxane.

[0089] In some implementations, the mass percentage of the second photosensitizer is (0%-10%). For example, the mass percentage of the second photosensitizer can be 0.2%, 0.5%, 1%, 5%, or 10%.

[0090] In this way, the second photosensitizer increases the concentration of free radicals and cations generated in the film-forming agent, thereby completely cross-linking and curing the first monomer.

[0091] In some implementations, the film-forming agent 40 also includes a third photosensitizer, which is doped in the first quantum dot 41. The third photosensitizer is configured to trigger a C-H insertion reaction under the action of the first light. It can be understood that the third photosensitizer can cause a carbon-hydrogen insertion reaction between molecules containing carbon-hydrogen bonds, so that the molecules containing carbon-hydrogen bonds are connected, and the components containing carbon-hydrogen bond molecules in the film-forming agent 40 are cross-linked in pairs. For example, there are alkyl chain molecules on the surface of the first quantum dot 41, and the alkyl chain includes carbon-hydrogen bonds. Through the carbon-hydrogen insertion reaction, the first quantum dot 41 is cross-linked with other components containing carbon-hydrogen bonds in the film-forming agent 40.

[0092] In some implementations, the third photosensitizer includes at least one of an azide crosslinker, a diazo crosslinker, and a benzophenone crosslinker. It is understood that an azide crosslinker includes two or more azide functional groups, a diazo crosslinker includes two or more diazo functional groups, and a benzophenone crosslinker includes two or more benzophenone functional groups.

[0093] In some embodiments, the third photosensitizer includes an azide crosslinker. Under the action of the first light, the third photosensitizer triggers a CH insertion reaction between the alkyl chain on the surface of the first quantum dot 41 and the first monomer, thereby triggering crosslinking and curing of the film-forming agent 40.

[0094] In some embodiments, the third photosensitizer includes a diazo crosslinker. Under the action of the first light, the third photosensitizer triggers a CH insertion reaction between the alkyl chain on the surface of the first quantum dot 41 and the first monomer, thereby triggering crosslinking and curing of the film-forming agent 40.

[0095] In some embodiments, the third photosensitizer includes a benzophenone crosslinker. Under the action of the first light, the third photosensitizer triggers a CH insertion reaction between the alkyl chain on the surface of the first quantum dot 41 and the first monomer, thereby triggering crosslinking and curing of the film-forming agent 40.

[0096] In some embodiments, the first photosensitizer includes an azide crosslinker, a benzophenone crosslinker, and a diazo crosslinker. In some embodiments, the third photosensitizer includes a diazo crosslinker. Under the action of the first light, the third photosensitizer triggers a CH insertion reaction between the alkyl chain on the surface of the first quantum dot 41 and the first monomer, thereby triggering the crosslinking and curing of the film-forming agent 40.

[0097] In some implementations, the mass percentage of the third photosensitizer is (0%-5%). For example, the mass percentage of the third photosensitizer can be 0.5%, 1%, 3%, or 5%.

[0098] In this way, the third photosensitizer promotes a carbon-hydrogen insertion reaction between molecules containing carbon-hydrogen bonds in the film-forming agent 40, so that the first quantum dots 41 are cross-linked with the components containing carbon-hydrogen bonds in the film-forming agent 40, thereby having a high solid content of the first quantum dots 41 in the color conversion film 30 and a high quantum yield.

[0099] In some implementations, the film-forming agent 40 further includes a thickener, which is doped in the first monomer and is used to increase the viscosity of the film-forming agent 40. The thickener includes a resin, and illustratively, the thickener can be polyvinyl acetate (PVAC), polyethylene (PE), epoxy resin, or acrylic resin.

[0100] In some implementations, the mass percentage of the thickener is (0%-1%). For example, the mass percentage of the thickener can be 0.2%, 0.5%, or 1%.

[0101] In this way, the thickener can increase the viscosity of the film-forming agent 40 , thereby accelerating the curing speed of the film-forming agent 40 and increasing the thickness of the color conversion film 30 , thereby improving the absorbance of the color conversion film 30 .

[0102] In some implementations, the film-forming agent 40 further includes a resin, which is doped within the first monomer, and the mass percentage of the resin is [0%-50%]. For example, the mass percentage of the resin can be 0%, 10%, 30%, or 50%. It is understood that the resin is a combination of one or more polymers that are solid at room temperature and contain carbon chains in their molecular structure. For example, the resin can be PVAC, PE, polystyrene (PS), epoxy resin, or acrylic resin.

[0103] In this way, the resin, under the action of the first and second photosensitizers, undergoes a cross-linking reaction with the other components of the film-forming agent 40, causing the film-forming agent 40 to solidify. Under the action of the third photosensitizer, the resin undergoes a hydrocarbon insertion reaction with the first quantum dots 41, resulting in a high solids content and quantum yield of the first quantum dots 41 within the color-conversion film 30. The resin also increases the viscosity of the film-forming agent 40, thereby increasing the thickness of the color-conversion film 30 and improving its absorbance.

[0104] In some related technologies, the color conversion film 30 is prepared by mixing the first quantum dots 41 into a conventional photoresist. However, the first quantum dots 41 do not form a chemical bond with the photoresist within the color conversion film 30. Instead, the first quantum dots 41 exist only in an embedded form, with a loose bond and prone to detachment. This results in a low solid content of the first quantum dots 41 within the color conversion film 30, causing significant light leakage from the color conversion film 30, which affects the color gamut of the display module 20 (as shown in FIG3 ). Increasing the blue light absorption rate by increasing the thickness of the color conversion film 30 or adding scattering particles can lead to incomplete curing of the bottom of the color conversion film 30, which in turn affects the resolution and contrast of the display module 20 and makes the color conversion film 30 easily detach from the substrate 32. Increasing the contrast of the display module 20 by increasing the exposure dose can also lead to a decrease in quantum yield.

[0105] The first quantum dots 41 in the present embodiment undergo a carbon-hydrogen intercalation reaction with the other components of the film-forming agent 40, resulting in a tight bond. As a result, the first quantum dots 41 in the color conversion film 30 of the present embodiment have a high solid content and a high quantum yield, thereby ensuring high resolution and contrast of the display module 20.

[0106] Referring to FIG. 7 , the present embodiment further provides a method for preparing a film-forming agent 40 (as shown in FIG. 6 ), comprising:

[0107] S201: doping a first quantum dot, a first photosensitizer, and a first co-initiator into a first monomer.

[0108] Among them, the first quantum dot 41 (as shown in Figure 6) is configured to excite the first fluorescence under the irradiation of the first light, and the first photosensitizer and the first co-initiator are configured to be triggered by the first fluorescence to generate free radicals and / or cations, and the free radicals and cations are used to promote the curing of the first monomer.

[0109] In some embodiments, the film-forming agent 40 further includes a first solvent in which the first monomer is dissolved. The first solvent may include toluene, octane, or the like. The first solvent may serve as a dispersant to promote uniform dispersion of the components within the film-forming agent 40, prevent precipitation and aggregation, and thereby improve the quality and stability of the film-forming agent 40.

[0110] In this way, the film-forming agent 40 prepared by the film-forming agent preparation method provided in the embodiment of the present application utilizes the first fluorescence generated by the first quantum dot 41, and triggers the first photosensitizer and the first co-initiator to generate free radicals and / or cations through the first fluorescence. The free radicals and cations promote the curing of the first monomer, so that the color conversion film 30 is completely cured, thereby improving the resolution of the display module 20 (as shown in Figure 3).

[0111] The method for preparing the film-forming agent 40 further comprises:

[0112] S203: doping the second photosensitizer into the first monomer.

[0113] The second photosensitizer is configured to generate free radicals and / or cations under the action of the first light, and the free radicals and cations are used to promote the curing of the first monomer.

[0114] The method for preparing the film-forming agent 40 further comprises:

[0115] S205 : doping the third photosensitizer into the first quantum dot 41 .

[0116] The third photosensitizer is configured to trigger the cross-linking of the first quantum dots 41 and the components containing carbon-hydrogen bond molecules in the film-forming agent 40 under the action of the first light.

[0117] The method for preparing the film-forming agent 40 further comprises:

[0118] S207: doping the thickener into the first monomer.

[0119] The thickener is used to increase the viscosity of the film-forming agent 40 .

[0120] Referring to FIG. 8 , the present embodiment further provides a method for preparing a color conversion film 30 (as shown in FIG. 5 ), comprising:

[0121] S101: forming a light shielding layer, wherein an opening is provided on the light shielding layer (as shown in FIG9 ).

[0122] It is understood that a light shielding layer 31 may be formed on the substrate 32, and openings may be provided on the light shielding layer 31 by nanoimprinting, photolithography, etc. The present application does not limit the substrate 32. Exemplarily, the material of the substrate 32 may include glass, quartz, single crystal silicon, or GaN.

[0123] S103: providing a film-forming agent, and filling the opening with the film-forming agent (as shown in FIG. 10 ).

[0124] S105: irradiating the film-forming agent in the opening with a first light to solidify the film-forming agent (as shown in FIG. 11 ).

[0125] It is understood that when the first light is irradiated, a contact mask 33 can be placed over the light shielding layer 31. The contact mask 33 has at least one through hole 331. In the implementation where the backlight module 21 uses a Micro-LED, the shape and size of the through hole 331 correspond to the shape and size of the backlight module 21.

[0126] In some embodiments, the film-forming agent 40 (as shown in FIG6 ) includes 10 mg of red InP quantum dots, 9 mg of epoxy monomer 2021P, 0.01 mg of red light photosensitizer new methylene blue, 0.02 mg of MDEA, 0.2 mg of iodonium salt DPI.PF6, 0.3 mg of 2,6-bis(4-azidobenzylidene)-4-cyclohexanone, 1 mg of UVI6976, and 2 mg of resin PVAC, dissolved in 200 μL of solvent, with a solvent ratio of toluene: dichloromethane = 4:1. The film-forming agent 40 is spin-coated on a clean quartz wafer at a speed of 800 rpm for 30 seconds, and then annealed at 70° C. for 10 minutes ... 2 The film-forming agent 40 is irradiated with an LED surface light source for a crosslinking time of 3 to 60 seconds. The quartz plate coated with the film-forming agent 40 is immersed in a toluene solution and allowed to stand for 90 seconds to obtain a color conversion film 30 prepared from the film-forming agent 40 after exposure and solvent development (as shown in FIG5 ).

[0127] The method for preparing the color conversion film 30 provided in the embodiments of the present application has a limited number of steps, is simple to operate, and is amenable to large-scale industrial production. In the color conversion film 30 produced by the method for preparing the color conversion film 30 provided in the embodiments of the present application, the light-shielding layer 31 can prevent backlight loss, prevent color confusion of light emitted from adjacent color conversion film 30 units, and improve the resolution and contrast of the color conversion film 30.

[0128] Please refer to Figure 12, which shows the absorption curve of the color conversion film 30 (shown in Figure 5). The horizontal axis represents the wavelength of absorbed light, and the vertical axis represents the absorbance of the color conversion film 30. The upper curve in Figure 12 shows the absorption curve of the color conversion film 30 before development, and the lower curve shows the absorption curve of the color conversion film 30 after development. As can be seen from Figure 12, the absorbance of the color conversion film 30 at a wavelength of 460nm before development is 2.46, while the absorbance of the color conversion film 30 at a wavelength of 460nm after development is 2.32. Testing with a step profiler revealed that the thickness of the color conversion film 30 before development was 0.97μm, while the thickness of the color conversion film 30 after development was 0.96μm. Calculated based on the above data, the optical density of the color conversion film 30 is 2.42 / μm. It can be understood that the absorbance of the color conversion film 30 after development is slightly lower than that before development, and the film thickness is almost unchanged, indicating that the color conversion film 30 is less damaged during development and the cross-linking and curing effect of the color conversion film 30 is better.

[0129] In some embodiments, the film-forming agent 40 (as shown in FIG6 ) includes 10 mg of red InP quantum dots, 9 mg of acrylate monomer EM221, 0.01 mg of red light photosensitizer new methylene blue, 0.04 mg of MDEA, 0.2 mg of iodonium salt DPI.PF6, 0.3 mg of 2,6-bis(4-azidobenzylidene)-4-cyclohexanone, 2 mg of UVI6976, and 2 mg of resin PVAC, dissolved in 200 uL of solvent, with a solvent ratio of toluene: dichloromethane = 3:1. The film-forming agent 40 is applied to a clean quartz wafer using a 75 μm scraper at 60 cm / s, and then annealed at 70° C. for 10 min. Exposure: A contact mask is placed on the quartz wafer coated with the film-forming agent 40, and a 365 nm laser with an energy density of approximately 200 mW / cm 2 The film-forming agent 40 is irradiated with an LED surface light source for a crosslinking time of 3 to 60 seconds. Development: The quartz plate coated with the film-forming agent 40 is immersed in a toluene solution and allowed to stand for 90 seconds to obtain a color conversion film 30 prepared from the film-forming agent 40 after exposure and solvent development (as shown in FIG. 5 ).

[0130] Please refer to Figure 13, which shows the absorption curve of the color conversion film 30 (shown in Figure 5). The horizontal axis represents the wavelength of absorbed light, and the vertical axis represents the absorbance of the color conversion film 30. The upper curve in Figure 13 shows the absorption curve of the color conversion film 30 before development, and the lower curve shows the absorption curve of the color conversion film 30 after development. As can be seen from Figure 13, the absorbance of the color conversion film 30 at a wavelength of 460 nm before development is 1.84, while the absorbance of the color conversion film 30 at a wavelength of 460 nm after development is 1.83. Testing with a step profiler revealed that the thickness of the color conversion film 30 before development was 0.87 μm, while the thickness of the color conversion film 30 after development was 0.87 μm. Calculated based on the above data, the optical density of the color conversion film 30 is 2.10 / μm. It can be understood that the absorbance and thickness of the color conversion film 30 after development are almost unchanged compared to the color conversion film 30 before development, indicating that the color conversion film 30 is less damaged during development and has a better cross-linking and curing effect. Please refer to Figure 14, which shows the patterned effect of the color conversion film 30 (as shown in Figure 5). In Figure 14, the line width d is approximately 15 μm, and the spacing r between two lines is approximately 15 μm.

[0131] In some embodiments, the film-forming agent 40 (as shown in FIG6 ) includes 100 mg of red InP quantum dots, 45 mg of epoxy monomer 2021P, 45 mg of acrylate monomer EM221, 0.1 mg of red light photosensitizer new methylene blue, 0.2 mg of MDEA, 0.2 mg of iodonium salt DPI.PF6, 3 mg of 2,6-bis(4-azidobenzylidene)-4-cyclohexanone, 10 mg of UVI6976, and 2 mg of resin PVAC, dissolved in 2 mL of solvent, with a solvent ratio of toluene: dichloromethane = 4:1. Exposure: The film-forming agent 40 is spin-coated on an 8-inch single crystal silicon wafer at a speed of 200 rpm for 360 seconds, followed by annealing at 40° C. for 2 minutes. The energy density used by the photolithography machine is approximately 200 mW / cm 2 The film-forming agent 40 is irradiated with i-rays for 600ms. Development: The wafer coated with the film-forming agent 40 is immersed in a toluene solution and allowed to stand for 90s to obtain a color conversion film 30 prepared from the film-forming agent 40 and subjected to exposure and solvent development (as shown in FIG5 ).

[0132] Please refer to Figure 15, which shows the patterned effect of the color conversion film 30 (shown in Figure 5). The diameter D of the circular pixels in Figure 15 is approximately 4 μm, and the spacing L between adjacent circular pixels is 4 μm. It can be understood that the color conversion film 30, which uses both epoxy monomer 2021P and acrylate monomer EM221, produces a pattern with high clarity and contrast.

[0133] In some embodiments, the film-forming agent 40 (as shown in FIG6 ) includes 10 mg of green CdSe quantum dots, 9 mg of homemade epoxy resin, 0.01 mg of green light photosensitizer Safranin O, 0.2 mg of MDEA, 0.2 mg of iodonium salt DPI.PF6, 0.3 mg of 2,6-bis(4-azidobenzylidene)-4-cyclohexanone, and 0.5 mg of UVI6976, dissolved in 200 μL of solvent with a solvent ratio of toluene to dichloromethane = 2:1. The film-forming agent 40 is spin-coated on a clean quartz wafer at a speed of 1000 rpm for 30 seconds, followed by annealing at 70° C. for 10 minutes. Exposure: 365 nm with an energy density of approximately 200 mW / cm 2 The film-forming agent 40 is irradiated with an LED surface light source for a crosslinking time of 3 to 60 seconds. Development: The quartz plate coated with the film-forming agent 40 is immersed in a toluene solution and allowed to stand for 90 seconds to obtain a color conversion film 30 prepared from the film-forming agent 40 after exposure and solvent development (as shown in FIG. 5 ).

[0134] Please refer to Figure 16, which shows an absorption curve of the color conversion film 30 (shown in Figure 5). The abscissa represents the wavelength of absorbed light, and the ordinate represents the absorbance of the color conversion film 30. The upper curve in Figure 16 shows the absorption curve of the color conversion film 30 before development, and the lower curve shows the absorption curve of the color conversion film 30 after development. As can be seen in Figure 16, the absorbance of the color conversion film 30 at a wavelength of 460 nm before development is 2.86, while the absorbance of the color conversion film 30 at a wavelength of 460 nm after development is 2.68, representing a 6.29% decrease in absorbance. This indicates that the color conversion film 30 has a high degree of crosslinking after exposure, resulting in minimal loss during development. The absorbance of 2.68 corresponds to an absorption efficiency of 99.8% at 460 nm. The color conversion film 30 only transmits 0.2% of blue light, demonstrating the high efficiency of the color conversion film 30 in absorbing blue light.

[0135] In some embodiments, the film-forming agent 40 (as shown in FIG6 ) includes 10 mg of red InP quantum dots, 9 mg of epoxy monomer 2021P, 0.01 mg of red light photosensitizer new methylene blue, 0.2 mg of MDEA, 0.2 mg of iodonium salt DPI.PF6, 0.5 mg of UVI6976, and 2 mg of resin PVAC, dissolved in 200 μL of solvent with a solvent ratio of toluene to dichloromethane = 2:1. The film-forming agent 40 is spin-coated on a clean quartz wafer at 800 rpm for 30 seconds, followed by annealing at 70°C for 10 minutes. Exposure: 365 nm with an energy density of approximately 200 mW / cm 2 The film-forming agent 40 is irradiated with an LED surface light source for a crosslinking time of 3 to 60 seconds. Development: The quartz plate coated with the film-forming agent 40 is immersed in a toluene solution and allowed to stand for 90 seconds to obtain a color conversion film 30 prepared from the film-forming agent 40 after exposure and solvent development (as shown in FIG. 5 ).

[0136] Please refer to Figure 17, which shows an absorption curve of the color conversion film 30 (shown in Figure 5). The abscissa represents the wavelength of absorbed light, and the ordinate represents the absorbance of the color conversion film 30. The upper curve in Figure 17 shows the absorption curve of the color conversion film 30 before development, and the lower curve shows the absorption curve of the color conversion film 30 after development. As can be seen from Figure 17, the absorbance of the color conversion film 30 at a wavelength of 460 nm before development is 2.01, while the absorbance of the color conversion film 30 at a wavelength of 460 nm after development is 1.42, a 29.59% decrease in absorbance. Step profiler testing revealed that the thickness of the color conversion film 30 before development was 0.96 μm, while the thickness after development was 0.94 μm. It can be understood that the thickness of the color conversion film 30 after development is basically unchanged compared with the color conversion film 30 before development, but the absorbance is significantly reduced, indicating that the first photosensitizer and the first co-initiator in the film-forming agent 40 trigger the first monomer to undergo cross-linking polymerization under the action of red light to form a film, while the third photosensitizer 2,6-bis(4-azidobenzylidene)-4-cyclohexanone cannot trigger the first quantum dots 41 (as shown in FIG. 6 ) to undergo cross-linking with other molecules in the film-forming agent 40 under the action of red light, and only exists in the color conversion film 30 in an embedded manner and is partially washed away during development, resulting in a poor cross-linking and curing effect.

[0137] This embodiment illustrates that the third photosensitizer in the embodiment of the present application plays an important role in cross-linking the first quantum dots 41 with other components in the film-forming agent 40 , thereby solidifying the first quantum dots 41 in the color conversion film 30 and stabilizing the color conversion film 30 .

[0138] In some embodiments, the film-forming agent 40 (as shown in FIG6 ) includes 10 mg of red InP quantum dots, 9 mg of epoxy monomer 2021P, 0.01 mg of red light photosensitizer new methylene blue, 0.2 mg of MDEA, 0.2 mg of iodonium salt DPI.PF6, 0.3 mg of 2,6-bis(4-azidobenzylidene)-4-cyclohexanone, and 0.5 mg of UVI6976, dissolved in 200 μL of solvent, with a solvent ratio of toluene: dichloromethane = 2:1. The film-forming agent 40 is spin-coated on a clean quartz wafer at a speed of 800 rpm for 30 seconds, followed by annealing at 70° C. for 10 minutes. Exposure: 365 nm with an energy density of approximately 200 mW / cm 2 The film-forming agent 40 is irradiated with an LED surface light source for a crosslinking time of 3 to 60 seconds. Development: The quartz plate coated with the film-forming agent 40 is immersed in a toluene solution and allowed to stand for 90 seconds to obtain a color conversion film 30 prepared from the film-forming agent 40 after exposure and solvent development (as shown in FIG. 5 ).

[0139] Please refer to Figure 18, which shows an absorption curve of the color conversion film 30 (shown in Figure 5). The abscissa represents the wavelength of absorbed light, and the ordinate represents the absorbance of the color conversion film 30. The upper curve in Figure 18 shows the absorption curve of the color conversion film 30 before development, and the lower curve shows the absorption curve after development. As can be seen in Figure 18, the absorbance of the color conversion film 30 at a wavelength of 460 nm is 0.86 before development, while the absorbance of the color conversion film 30 at a wavelength of 460 nm is 0.84 after development, a 2.3% decrease in absorbance. The absorbance of the color conversion film 30 decreases to below 1, and the blue light absorption efficiency of the color conversion film 30 is only approximately 85.5%, with 14.5% of blue light leaking out.

[0140] This embodiment illustrates that the resin in the embodiment of the present application can increase the thickness of the color conversion film 30 , thereby increasing the absorbance of the color conversion film 30 . That is, the resin can increase the blue light absorption efficiency of the color conversion film 30 and reduce blue light leakage.

[0141] In some embodiments, the film-forming agent 40 (as shown in FIG6 ) includes 10 mg of red InP quantum dots, 0.01 mg of red light photosensitizer new methylene blue, 0.2 mg of MDEA, 0.2 mg of iodonium salt DPI.PF6, 0.3 mg of 2,6-bis(4-azidobenzylidene)-4-cyclohexanone, and 0.5 mg of UVI6976, dissolved in 200 μL of solvent with a solvent ratio of toluene to dichloromethane = 2:1. The film-forming agent 40 is spin-coated on a clean quartz wafer at 800 rpm for 30 seconds, followed by annealing at 70° C. for 10 minutes. Exposure: 365 nm with an energy density of approximately 200 mW / cm 2 The film-forming agent 40 is irradiated with an LED surface light source for a crosslinking time of 3 to 60 seconds. Development: The quartz plate coated with the film-forming agent 40 is immersed in a toluene solution and allowed to stand for 90 seconds to obtain a color conversion film 30 prepared from the film-forming agent 40 after exposure and solvent development (as shown in FIG. 5 ).

[0142] Please refer to Figure 19, which shows an absorption curve of the color conversion film 30 (shown in Figure 5). The abscissa represents the wavelength of absorbed light, and the ordinate represents the absorbance of the color conversion film 30. The upper curve in Figure 19 shows the absorption curve of the color conversion film 30 before development, and the lower curve shows the absorption curve after development. As can be seen in Figure 19, the absorbance of the color conversion film 30 at a wavelength of 460 nm is 0.37 before development, while the absorbance of the color conversion film 30 at a wavelength of 460 nm is 0.34 after development, a decrease of 8.1%. The absorbance of the color conversion film 30 has dropped below 0.5, and the blue light absorption efficiency of the color conversion film 30 is only approximately 54.3%, with 45.7% of blue light leaking out.

[0143] This embodiment differs from the previous embodiment in that the epoxy monomer 2021P is omitted. Comparison of the data with the previous embodiment demonstrates that the first monomer in this embodiment increases the thickness of the color conversion film 30, thereby improving the absorbance of the color conversion film 30. Specifically, the first monomer improves the blue light absorption efficiency of the color conversion film 30 and reduces blue light leakage. Furthermore, without the first monomer, the first and second photosensitizers are ineffective, and cross-linking reactions in the film-forming agent 40 can only occur through the first quantum dots 41 (as shown in FIG. 6 ). Consequently, the cross-linking efficiency of the film-forming agent 40 is reduced.

[0144] In some embodiments, a film-forming agent 40 (as shown in FIG6 ) includes 10 mg of red InP quantum dots, 9 mg of epoxy monomer 2021P, 0.5 mg of UVI6976, and 0.1 mg of PVAC resin, dissolved in 200 μL of a solvent with a toluene:methylene chloride ratio of 4:1. The film-forming agent 40 is spin-coated on a clean quartz wafer at 800 rpm for 30 seconds, followed by annealing at 70°C for 10 minutes. Exposure: 365 nm with an energy density of approximately 200 mW / cm 2 The film-forming agent 40 is irradiated with an LED surface light source for a crosslinking time of 3 to 60 seconds. Development: The quartz plate coated with the film-forming agent 40 is immersed in a toluene solution and allowed to stand for 90 seconds to obtain a color conversion film 30 prepared from the film-forming agent 40 after exposure and solvent development (as shown in FIG. 5 ).

[0145] Please refer to Figure 20, which shows an absorption curve of the color conversion film 30 (shown in Figure 5). The abscissa represents the wavelength of absorbed light, and the ordinate represents the absorbance of the color conversion film 30. The upper curve in Figure 20 shows the absorption curve of the color conversion film 30 before development, and the lower curve shows the absorption curve of the color conversion film 30 after development. As can be seen in Figure 20, the absorbance of the color conversion film 30 at a wavelength of 460 nm before development is 2.15, while the absorbance of the color conversion film 30 at a wavelength of 460 nm after development is 1.67, a 22.3% decrease in absorbance. The significant decrease in absorbance of the color conversion film 30 after development indicates that the photo-crosslinking and curing of the first quantum dots 41 (shown in Figure 6) is poor, resulting in the first quantum dots 41 being washed away by the developing solvent (toluene solution).

[0146] This embodiment illustrates that the effect of using only UV curing is poor, the content of the first quantum dots 41 is low, and the first photosensitizer and the first co-initiator can promote the curing of the film-forming agent 40 under the action of the first fluorescence, so that the color conversion film 30 is completely cured.

[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A film-forming agent for preparing a color conversion film, characterized in that: include: First monomer; a first quantum dot, wherein the first quantum dot is doped in the first monomer and configured to excite a first fluorescence under irradiation of a first light; A first photosensitizer and a first co-initiator, wherein the first photosensitizer and the first co-initiator are doped in the first monomer, and the first photosensitizer and the first co-initiator are configured to be triggered by the first fluorescence to generate free radicals and / or cations, and the free radicals and the cations are used to promote the curing of the first monomer.

2. The film-forming agent according to claim 1, characterized in that The first monomer includes at least one of an epoxy monomer and an acrylate monomer.

3. The film-forming agent according to claim 1 or 2, characterized in that The first quantum dots include at least one of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, PbS, PbSe, PbTe, HgS, HgSe, HgTe, GaN, GaP, GaAs, InP, InAs, ZnO, SnO2, TiO2, CuO, In2O3, Ga2O3, SiO2, NiO, MoO3, WO3, Cu2O, Fe3O4, carbon dots, and perovskite compounds.

4. The film-forming agent according to any one of claims 1 to 3, characterized in that The first quantum dot includes a core structure and a shell structure wrapped around the core structure, the core structure includes a first nanocrystalline particle, and the shell structure includes a second nanocrystalline particle.

5. The film-forming agent according to claim 4, characterized in that The first nanocrystalline particles and the second nanocrystalline particles include at least one of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, PbS, PbSe, PbTe, HgS, HgSe, HgTe, GaN, GaP, GaAs, InP, InAs, ZnO, SnO2, TiO2, CuO, In2O3, Ga2O3, SiO2, NiO, MoO3, WO3, Cu2O, Fe3O4, carbon dots, and perovskite compounds.

6. The film-forming agent according to any one of claims 1 to 5, characterized in that The first photosensitizer includes at least one of triazine, oxime, benzoin ether, benzil ketal, bisimidazole, aroylphosphine oxide, acridine dye, xanthene dye, thioxanthene dye, phenazine dye, phenoxazine dye, phenothiazine dye, triarylmethane dye, monomethine cyanine dye, dimethine cyanine dye, trimethine cyanine dye, pentamethine cyanine dye, hemicyanine dye, external cationic merocyanine dye, external cationic neutral cyanine dye, zero methine dye, and streptococcinium dye; The first co-initiator includes at least one of an amine co-initiator, a silane co-initiator, an iodonium salt, and a sulfonium salt.

7. The film-forming agent according to any one of claims 1 to 6, characterized in that The mass percentage of the first monomer is [10%-60%], the mass percentage of the first quantum dots is [1%-80%], the mass percentage of the first photosensitizer is (0%-1%], and the mass percentage of the first co-initiator is (0%-1%].

8. The film-forming agent according to any one of claims 1 to 7, characterized in that The film-forming agent further includes a second photosensitizer, which is doped in the first monomer and configured to generate free radicals and / or cations under the action of the first light. The free radicals and the cations are used to promote the curing of the first monomer.

9. The film-forming agent according to claim 8, characterized in that The second photosensitizer includes at least one of a compound containing a chromophore, a diazonium salt, a diaryliodonium salt, a triarylsulfonium salt, an alkylsulfonium salt, an iron arene salt, a sulfonyloxy ketone, and a triarylsiloxane.

10. The film-forming agent according to claim 8 or 9, characterized in that The mass percentage of the second photosensitizer is (0%-10%).

11. The film-forming agent according to any one of claims 1 to 10, characterized in that The film-forming agent further includes a third photosensitizer, which is doped in the first quantum dot. The third photosensitizer is configured to trigger a CH insertion reaction under the action of the first light, and the CH insertion reaction is used to promote the curing of the first monomer and the first quantum dot.

12. The film-forming agent according to claim 11, characterized in that The third photosensitizer includes at least one of an azide crosslinking agent, a diazo crosslinking agent, and a benzophenone crosslinking agent.

13. The film-forming agent according to claim 8 or 9, characterized in that The mass percentage of the third photosensitizer is (0%-5%).

14. The film-forming agent according to any one of claims 1 to 13, characterized in that The film-forming agent further includes a thickener, which is doped in the first monomer and is used to increase the viscosity of the film-forming agent.

15. The film-forming agent according to claim 14, characterized in that The thickener includes a resin.

16. The film-forming agent according to claim 14 or 15, characterized in that The mass percentage of the thickener is (0%-1%).

17. A method for preparing a film-forming agent, characterized in that: include: doping a first quantum dot, a first photosensitizer, and a first co-initiator into a first monomer; The first quantum dot is configured to excite a first fluorescence under the irradiation of a first light; the first photosensitizer and the first co-initiator are configured to be triggered by the first fluorescence to generate free radicals and / or cations, and the free radicals and the cations are used to promote the curing of the first monomer.

18. The method for preparing a film-forming agent according to claim 17, wherein: Also includes: doping a second photosensitizer into the first monomer; The second photosensitizer is configured to generate the free radicals and / or the cations under the action of the first light, and the free radicals and the cations are used to promote the curing of the first monomer.

19. The method for preparing a film-forming agent according to claim 18, wherein: Also includes: doping a third photosensitizer into the first quantum dot; The third photosensitizer is configured to trigger a CH insertion reaction under the action of the first light, and the CH insertion reaction is used to promote the curing of the first monomer and the first quantum dot.

20. The method for preparing a film-forming agent according to claim 19, wherein: Also includes: doping a thickener into the first monomer; The thickener is used to increase the viscosity of the film-forming agent.

21. A color conversion film, characterized in that: include: a light-shielding layer, wherein the light-shielding layer is provided with an opening; The film-forming agent according to any one of claims 1 to 16, wherein the film-forming agent is filled in the opening.

22. A method for preparing a color conversion film, characterized in that: include: forming a light shielding layer, wherein the light shielding layer is provided with an opening; Providing the film-forming agent according to any one of claims 1 to 16, and filling the film-forming agent into the opening; The film-forming agent in the opening is irradiated with a first light to cure the film-forming agent.

23. A display module, characterized in that: include: A backlight module and the color conversion film according to claim 21, wherein the color conversion film is arranged on the light output side of the backlight module.

24. A display device, characterized in that: include: A housing and the display module according to claim 23, wherein the display module is arranged in the housing.

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