CN114509897A - Quantum dot brightening composite film and preparation method thereof - Google Patents

Quantum dot brightening composite film and preparation method thereof Download PDF

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Publication number
CN114509897A
CN114509897A CN202210151854.4A CN202210151854A CN114509897A CN 114509897 A CN114509897 A CN 114509897A CN 202210151854 A CN202210151854 A CN 202210151854A CN 114509897 A CN114509897 A CN 114509897A
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layer
quantum dot
crown
photosensitive resin
base film
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CN114509897B (en
Inventor
张爱迪
许其霞
龙辉
郝鸿程
王宗稷
王逸菲
朱洪亮
刘勇
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Nanjing Beidi New Material Technology Co ltd
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Nanjing Beidi New Material Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/0005—Production of optical devices or components in so far as characterised by the lithographic processes or materials used therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

The invention discloses a quantum dot brightening composite film and a preparation method thereof. The quantum dot brightening composite film comprises a quantum dot layer and a composite brightening layer; the composite brightening layer comprises a micro prism layer and a crown lens layer; the micro prism layer is deposited on the upper surface of the quantum dot layer and comprises a plurality of micro prisms, the vertex angle of each micro prism is 70-90 degrees, and the distance between every two adjacent micro prisms is 20-40 micrometers; the crown lens layer comprises a base film attached to the micro prism layer and a plurality of crown lenses deposited on the base film, and the side surfaces of the crown lenses are spherical; the bottom surface is circular or regular polygon, and the maximum length of the bottom surface is 25-60 microns. The quantum dot brightening composite film has the advantage of thinner overall thickness, and can prevent the problems of reduced light intensity and light uniformity caused by abrasion of the existing brightening layer. The preparation method adopts a full-solution coating process, the process flow is simple, the process cost is low, and the reliability of the obtained quantum dot brightening composite film is high.

Description

Quantum dot brightening composite film and preparation method thereof
Technical Field
The invention relates to the technical field of optical films, in particular to a quantum dot brightening composite film and a preparation method thereof.
Background
As a novel luminescent material, the quantum dot has the advantages of controllable luminescent spectrum, good luminescent stability and long fluorescence lifetime, and therefore, the quantum dot gradually occupies an important position in the application of the luminescent material of a display device. The most widely applied method is the combination of quantum dots and a liquid crystal display device, and the luminous color gamut of the quantum dot display device is greatly improved.
The structure of the quantum dot liquid crystal display device mainly comprises a quantum dot backlight source and a liquid crystal module arranged on the quantum dot backlight source. The quantum dot backlight source sequentially comprises a blue backlight source, a diffusion plate, a quantum dot film and a brightness enhancement film which are mutually overlapped. The quantum dot film comprises red quantum dots and green quantum dots, and the composite white light emitting light is formed under the excitation of a blue backlight source; the brightness enhancement film is used for improving the light-emitting brightness of the composite white light.
Although the structure has been widely used in industry, the following defects still exist: 1. the quantum dot backlight source is composed of mutually independent optical films, so that the thinning design of the whole structure of the quantum dot backlight source is not facilitated; 2. the structure of the brightness enhancement film of the superiors is mostly single-layer prism structure, multilayer prism structure, consequently when carrying out the liquid crystal module equipment of quantum dot backlight and upper strata, prism structure's point easily and adjacent rete intervally take place the damage, can influence its light brightening effect on the one hand, and the impurity that drops when on the other hand wearing and tearing can influence the light-emitting homogeneity of the whole liquid crystal disply device of quantum dot.
Disclosure of Invention
The invention aims to provide a quantum dot brightening composite film. The quantum dot brightening composite film adopts a full-deposition laminated structure, so that the whole thickness of the whole quantum dot backlight source is thinner; and the brightening layer combined by various micro-lens structures is adopted, so that the brightness of the emergent light is improved, and the problems of reduction of the emergent light intensity and the emergent light uniformity caused by abrasion of the conventional brightening layer can be solved.
The invention also provides a preparation method of the quantum dot brightening composite film. The preparation method is carried out by adopting a full-solution coating process, so that the process flow is simple, the process cost is low, and the obtained quantum dot brightening composite film has good reliability.
In order to achieve the above purpose, the invention provides the following technical scheme:
a quantum dot brightening composite film comprises a quantum dot layer and a composite brightening layer which are superposed; the composite brightness enhancement layer comprises a micro prism layer and a crown lens layer which are superposed; the micro prism layer is deposited on the upper surface of the quantum dot layer and comprises a plurality of micro prisms arranged in an array, the height range of each micro prism is 20-50 micrometers, the vertex angle range is 70-90 degrees, and the distance between every two adjacent micro prisms is 20-40 micrometers; the crown lens layer comprises a base film attached to the micro prism layer and a plurality of crown lenses deposited on the base film, the side surfaces of the crown lenses are spherical, and the bottom surfaces of the crown lenses are circular or regular polygonal; and the height range is 5-15 microns, and the maximum length range of the bottom surface is 25-60 microns.
Further, the bottom surface of the crown lens is in a regular hexagon shape, and the side length of the bottom surface is in a range of 15-30 micrometers.
Furthermore, the quantum dot layer sequentially comprises a lower basal film, a light-emitting layer and an upper basal film; the lower base film and the upper base film are respectively attached to two sides of the light-emitting layer in a face-to-face mode, the light-emitting layer comprises red quantum dots, green quantum dots and photosensitive resin, and the red quantum dots and the green quantum dots are uniformly dispersed in the photosensitive resin.
Further, a back coating is included, the back coating is deposited on the lower surface of the lower base film, and the thickness of the back coating ranges from 3 micrometers to 10 micrometers; the back coating comprises anti-scratch particles and photosensitive resin, wherein the anti-scratch particles are uniformly dispersed in the photosensitive resin, the particle size of the anti-scratch particles is 50-500 nanometers, and the anti-scratch particles account for 0.1-5 mass percent of the back coating.
Further, the scratch-resistant particles are polypropylene particles, silicone particles, polycarbonate particles or polymethyl methacrylate particles.
The protective film is further included, a layer of pressure-sensitive adhesive is arranged below the protective film, and the protective film is attached to the upper surface of the coronary lens layer through the pressure-sensitive adhesive.
A preparation method of a quantum dot brightening composite film adopts full-solution coating to prepare the quantum dot brightening composite film, and comprises the following steps:
preparing a quantum dot layer;
preparing a roll shaft for engraving a plurality of microprisms arranged in an array, coating photosensitive resin on the roll shaft, then transferring the photosensitive resin on the roll shaft to the upper surface of the quantum dot layer through an automatic coating process, and obtaining the microprism layer through ultraviolet curing;
preparing a basement membrane;
preparing a roll shaft for engraving a plurality of crown lenses arranged in an array, coating photosensitive resin on the roll shaft, then transferring the photosensitive resin on the roll shaft to the upper surface of the base film through an automatic coating process, and obtaining the crown lens layer through ultraviolet light curing;
and coating a layer of photosensitive adhesive on the spare surface of the base film in the crown lens layer, and adhering the surface of the crown lens layer to the upper surface of the micro prism layer through the photosensitive adhesive by adopting a roll-to-roll process.
A preparation method of a quantum dot brightening composite film adopts full-solution coating to prepare the quantum dot brightening composite film, and comprises the following steps:
preparing a quantum dot layer;
preparing a roll shaft for carving a plurality of microprisms arranged in an array, coating photosensitive resin on the roll shaft, then transferring the photosensitive resin on the roll shaft to the upper surface of the quantum dot layer through an automatic coating process, and obtaining the microprism layer through ultraviolet light curing;
preparing a base film, coating a layer of photosensitive adhesive on the lower surface of the base film, and adhering the base film surface to the upper surface of the micro prism layer through the photosensitive adhesive by adopting a roll-to-roll process;
preparing a roller shaft for carving a plurality of crown lenses arranged in an array, coating photosensitive resin on the roller shaft, then transferring the photosensitive resin on the roller shaft to the upper surface of the base film through an automatic coating process, and obtaining the crown lens layer through ultraviolet light curing.
Further, the crown lens in the crown lens layer is prepared by ink-jet printing, and the steps are as follows:
setting a driving pulse for ink-jet printing according to the viscosity and surface tension of the photosensitive resin;
setting the number of continuously jetted droplets and the droplet spacing in single circulation of ink-jet printing according to the area of the bottom surface of the crown lens;
setting the number of cycles of ink-jet printing according to the height of the crown lens;
determining a printing starting point, carrying out ink-jet printing to obtain a plurality of array-arranged crown lenses, and curing the array-arranged crown lenses by ultraviolet light.
Further, preparing a protective film on the upper surface of the coronal lens layer, comprising:
preparing a protective film, and introducing a layer of pressure-sensitive adhesive on the lower surface of the protective film;
and adhering the protective film to the upper surface of the coronary lens layer by a pressure-sensitive adhesive by adopting a roll-to-roll process.
Has the advantages that:
according to the technical scheme, the invention provides the quantum dot brightening composite film, and the structure of the existing quantum dot brightening composite film is improved. Firstly, the composite brightening layer and the quantum dot layer are integrated into a whole through a deposition mode, so that the assembly of multiple optical film layers in the back-end process flow is avoided, and the corresponding production cost is reduced. Secondly, in the arrangement of the composite brightness enhancement layer, as the composite brightness enhancement layer is directly deposited on the quantum dot layer, the whole composite brightness enhancement layer takes the quantum dot layer as a substrate, thereby reducing the whole thickness of the quantum dot brightness enhancement composite film. Moreover, in the structural design of the composite brightening layer, a structure of combining a micro prism layer and a crown lens layer is adopted; and the coronal lens layer is a film layer away from the quantum dot layer. Therefore, the micro prism layer with stronger light-emitting brightness can ensure the integral light-emitting intensity of the quantum dot brightening composite film; the crown lens layer further enhances the light-emitting brightness, and simultaneously avoids abrasion in the using process due to the spherical structure with the smooth surface, thereby integrally ensuring the light-emitting brightness and the light-emitting uniformity of the whole liquid crystal display device.
The technical scheme of the invention also provides a preparation method of the at least one quantum dot brightening composite film. The preparation method adopts a full-solution coating process. In one preparation method, the composite brightness enhancement layer is prepared by transferring through a roller for patterning and carving, and the preparation method has the advantages of simple process flow and strong repeatability. In another manufacturing method, the crown lens layer is manufactured by an inkjet printing process, which is an additive manufacturing process, and the raw materials can be recycled, thereby reducing the process cost.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the specific embodiments according to the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a quantum dot brightness enhancement composite film according to the present invention;
FIG. 2 is a scanning electron microscope image of a quantum dot brightness enhancement composite film obtained according to the preparation method;
FIG. 3 is a scanning electron micrograph of the composite brightness enhancing layer of FIG. 2;
FIG. 4 is a scanning electron micrograph of the crown lens of FIG. 2.
The reference numbers in the figures are: 1 is a quantum dot layer, 2 is a composite brightening layer, 3 is a back coating layer, and 4 is a protective film; 11 is a lower base film, 12 is a light emitting layer, and 13 is an upper base film; 21 is a micro prism layer, 22 is a base film, 23 is a crown lens, and 31 is anti-scratch particles; 12a are red quantum dots and 12b are green quantum dots.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The use of "first," "second," and similar terms in the description and in the claims of the present application does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Similarly, the singular forms "a," "an," or "the" do not denote a limitation of quantity, but rather denote the presence of at least one, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or the like, mean that the elements or items listed before "comprises" or "comprising" encompass the features, integers, steps, operations, elements, and/or components listed after "comprising" or "comprising," and do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships may also be changed accordingly.
The invention provides a quantum dot brightening composite film, which is characterized in that a quantum dot layer and a composite brightening layer are arranged into an integrated structure, so that a multi-film assembly process in a back-end process is omitted, and the thickness of the whole quantum dot brightening composite film is reduced. In the structural design of the composite brightening layer, a structure combining the micro prism layer and the crown lens layer is used for ensuring the light-emitting brightness of the whole quantum dot brightening composite film; and the crown lens layer is arranged as a layer far away from the quantum dot layer, so that the abrasion of the composite brightness enhancement layer in the use process is avoided, and the problems of light-emitting uniformity and light-emitting brightness reduction caused by the abrasion are avoided.
The invention also provides a preparation method of the quantum dot brightening composite film, which adopts a full-solution coating process, so that the quantum dot brightening composite film with higher reliability is obtained; and has the advantages of simple process flow, strong repeatability and reduced process cost.
Example 1
The quantum dot brightness enhancement composite film disclosed by the invention is further specifically described in the following with reference to the embodiment shown in fig. 1.
As shown in fig. 1, the quantum dot brightness enhancement composite film comprises a quantum dot layer 1 and a composite brightness enhancement layer 2 which are stacked. The quantum dot layer 1 is used for forming composite white light emergent light under the excitation of a blue backlight source, and the composite brightening layer 2 is used for brightening the emergent light of the quantum dot layer 1. On the specific structure of the composite brightness enhancing layer 2, a structure comprising a micro-prism layer 21 and a crown lens layer which are superposed is provided. The micro-prism layer 21 is deposited on the upper surface of the quantum dot layer 1, and comprises a plurality of micro-prisms arranged in an array, in order to ensure the brightness enhancement effect, the height range of each micro-prism is 20-50 micrometers, the vertex angle range is 70-90 degrees, and the distance between every two adjacent micro-prisms is 20-40 micrometers. The crown lens layer comprises a base film 22 attached to the micro prism layer and a plurality of crown lenses 23 deposited on the base film 22, and in the specific structural arrangement, the side surfaces of the crown lenses 23 are spherical; the bottom surface is circular or regular polygon in shape, and has a height ranging from 5 micrometers to 15 micrometers and a maximum length ranging from 25 micrometers to 60 micrometers.
In specific implementation, the composite brightness enhancement layer 2 and the quantum dot layer 1 are integrated by deposition, so that the assembly of multiple optical film layers in the later-stage process flow is avoided, and the corresponding production cost is reduced. Since the composite brightness enhancement layer 2 is directly deposited on the quantum dot layer 1, the composite brightness enhancement layer 2 takes the quantum dot layer 1 as a substrate, so that the overall thickness of the quantum dot brightness enhancement composite film is reduced. And in the structural design of the composite brightening layer 2, a structure that the micro prism layer 21 and the crown lens layer are combined is adopted; and the coronal lens layer is a film layer away from the quantum dot layer. Therefore, the micro prism layer 21 with stronger light-emitting brightness can ensure the overall light-emitting intensity of the quantum dot brightening composite film; the crown-shaped lens layer further enhances the light-emitting brightness, and the crown-shaped lenses 23 are spherical structures with smooth surfaces, so that abrasion in the using process is avoided, and the light-emitting brightness and the light-emitting uniformity of the whole liquid crystal display device are integrally ensured.
In this embodiment, the bottom surface of the crown lens 23 is in the shape of a regular hexagon, and the maximum length of the bottom surface is in the range of 15 micrometers to 30 micrometers.
Since quantum dots are susceptible to water and oxygen attack and a loss in luminous efficiency occurs, the quantum dot layer 1 has an increased luminous lifetime. The quantum dot layer 1 is provided to include a lower base film 11, a light emitting layer 12, and an upper base film 13 in this order. The lower base film 11 and the upper base film 13 are respectively attached to two sides of the light emitting layer 12 to prevent water and oxygen from invading into the light emitting layer 12.
In this embodiment, the thicknesses of the lower base film 11 and the upper base film 13 are 30 to 200 micrometers; in the selection of specific types, a PET film is adopted; the PET film has good water oxygen barrier effect and low cost; thereby reducing the cost of the entire quantum dot layer 1.
In this embodiment, the light emitting layer 12 includes red quantum dots 12a, green quantum dots 12b, and a photosensitive resin, and the red quantum dots 12a and the green quantum dots 12b are uniformly dispersed in the photosensitive resin.
In this embodiment, the red quantum dots 12a and the green quantum dots 12b are both oil-soluble quantum dots, and may specifically be cadmium-containing quantum dots, such as CdSe quantum dots, CdS quantum dots, CdTe quantum dots, CdZnS quantum dots, or CdSeS quantum dots; or cadmium-free quantum dots, such as InP quantum dots, CuInS quantum dots; or organic-inorganic perovskite quantum dots (such as CH)3NH3PbX3Quantum dots, X ═ Cl, Br, I), all-inorganic perovskite quantum dots (e.g. CsPbX)3Quantum dots, X ═ Cl, Br, I), carbon quantum dots, graphene quantum dots, silicone quantum dots, and the like.
The optical resin may be one or more of methyl acrylate, ethyl acrylate, hydroxyethyl acrylate, isophorone diisocyanate, isobornyl acrylate, methyl methacrylate, tetrahydrofuran acrylate, diallyl phthalate, 2-hydroxyethyl methacrylate, 1, 3-adamantane glycol acrylate, diethylene glycol monoacrylate, 10- (2-methacryloyloxy) monodecanyl phosphate, 1, 2-diallyl phthalate DAP monomer, 1, 6-hexanediol diacrylate, monodisperse glycidyl methacrylate, and hydroquinone monomethacrylate.
In order to prevent the quantum dot layer 1 from being worn by external factors or adjacent structures, and the uniformity of light emission is affected. And a back coating layer 3 is arranged on the back surface of the quantum dot layer 1. The back coating 3 is deposited on the lower surface of the lower base film 11, and the thickness ranges from 3 micrometers to 10 micrometers; comprises anti-scratch particles 31 and photosensitive resin, wherein the anti-scratch particles 31 are uniformly dispersed in the photosensitive resin.
In specific implementation, in order to prevent the scratch-resistant particles 31 from shielding incident light of a blue backlight, the particle size of the scratch-resistant particles is set to be 50-500 nm, and the scratch-resistant particles account for 0.1-5% of the mass fraction of the back coating 3.
In this embodiment, the scratch resistant particles 31 are polypropylene particles, silicone particles, polycarbonate particles, or polymethyl methacrylate particles.
Also included in this embodiment is a protective film 4 disposed on top. A layer of pressure-sensitive adhesive is arranged below the protective film 4, and the protective film 4 is attached to the upper surface of the coronary lens layer through the pressure-sensitive adhesive. The thickness of the protective film 4 is 30-150 microns; among the specific types of choice may be polyethylene, polyvinyl chloride, polypropylene, polyester, and the like.
Example 2
The following describes the preparation method of the quantum dot brightness enhancement composite film disclosed by the present invention in detail with reference to the examples shown in fig. 1 to 4.
The preparation method adopts full-solution coating preparation and comprises the following steps:
s102, preparing a quantum dot layer;
in this step, the preparation process of the quantum dot layer 1 includes:
first, a lower base film 11, specifically a PET base film, having a thickness of 30 to 200 μm is prepared; in this embodiment, a PET base film having a thickness of 30 μm is preferably selected.
Secondly, a quantum dot solution for preparing the light emitting layer 12 is prepared; the quantum dot solution comprises red quantum dots, green quantum dots, photosensitive resin and a polar organic solvent; wherein the red quantum dots and the green quantum dots are both oil-soluble quantum dots; the polar organic solvent is a good dispersant of the oil-soluble quantum dots, and the viscosity of the photosensitive resin is high, so that the dispersion uniformity of the red quantum dots and the green quantum dots in the photosensitive resin can be improved by using the polar organic solvent as a medium.
Specifically, the preparation process of the quantum dot solution comprises the following steps: firstly, simultaneously adding red quantum dots and green quantum dots in a ratio of 3:1-6:1 into a reagent bottle, and adding a proper amount of polar organic solvent into the reagent bottle by using a liquid extractor so as to ensure that the red quantum dots and the green quantum dots are dispersed in the reagent bottle in an unsaturated state; and the red quantum dots and the green quantum dots are uniformly dispersed in the mixture by magnetic stirring. And then, adding the prepared solution into photosensitive resin, and uniformly dispersing by magnetic stirring to obtain the quantum dot solution.
In order to facilitate the formation of a light-emitting layer, a polar organic solvent introduced into the quantum dot solution is quickly volatilized, wherein the polar organic solvent is a medium-low boiling point solvent, and the boiling point of the solvent is lower than 120 ℃; specifically, the solvent may be one or more selected from toluene, chlorobenzene, octane, decane, etc.
Then, the quantum dot solution is uniformly coated on the surface of the lower base film 11 by a coating process, and a light emitting layer 12 is formed by ultraviolet light curing. When coating is carried out specifically, when the size of the backlight module is larger, a blade coating process is preferably adopted; when the size of the backlight module is small, a spin coating process is preferably adopted.
Finally, adhering a base film 13 on the upper surface of the luminous layer 12 through a roll-to-roll process, wherein the upper base film is a PET base film and has a thickness of 30-200 microns; a PET base film having a thickness of 30 μm was specifically selected in this example.
S104, preparing to carve a roll shaft of a plurality of microprisms arranged in an array mode, coating photosensitive resin on the roll shaft, then transferring the photosensitive resin on the roll shaft to the upper surface of the quantum dot layer through an automatic coating process, and obtaining the microprism layer 21 through ultraviolet light curing; the micro prism layer is specifically shown in FIG. 3;
in the step, the microprisms are formed by photosensitive resin and have certain fluidity; therefore, in order to ensure that the size of the prepared microprism meets the requirement, the microprism needs to be cured when the preparation is finished, and a larger curing light intensity is adopted, wherein the curing light intensity is 50-70%.
S106, preparing a basement membrane;
in this step, the base film 22 is specifically a PET base film, and the thickness thereof is 30 to 200 micrometers; a PET base film having a thickness of 30 μm was specifically selected in this example.
S108, preparing to carve a plurality of roller shafts of the crown lenses arranged in an array, coating photosensitive resin on the roller shafts, then transferring the photosensitive resin on the roller shafts to the upper surface of the base film through an automatic coating process, and obtaining the crown lens layer through ultraviolet light curing; the coronal lens layer is particularly shown in FIG. 4;
in this step, since the crown lens 23 is formed of a photosensitive resin, it has a certain fluidity; therefore, in order to ensure that the size of the prepared crown lens meets the requirement, the prepared crown lens needs to be cured at the completion of preparation, and a larger curing strength is adopted, specifically 50% -70%.
As an alternative embodiment, since the side surface of the crown lens is a spherical structure, the crown lens may be formed by using an inkjet printing process using a plurality of reciprocating depositions and a flow of a photosensitive resin. The method comprises the following specific steps:
firstly, setting a driving pulse of ink-jet printing according to the viscosity and the surface tension of the photosensitive resin; when the viscosity and the surface tension of the photosensitive resin are large and effective ink drops cannot be formed, the viscosity of the photosensitive resin can be reduced by heating the printing nozzle, or the viscosity and the surface tension can be reduced by adding a proper organic solvent into the photosensitive resin; thereby meeting the requirements of viscosity and surface tension in ink-jet printing.
Secondly, the number of the continuous ink-jet droplets in a single circulation of ink-jet printing and the droplet spacing are set according to the area of the bottom surface of the crown lens 23; the number of the droplets and the distance between the droplets of the continuous ink jet are in direct proportion to the size of the bottom surface of the crown lens.
Furthermore, the number of cycles for printing by ink-jet printing is set according to the height of the crown lens 23; the number of cycles is proportional to the height of the crown lens, and the number of droplets continuously printed per cycle is gradually reduced in the cyclic printing in order to form the spherical shape of the crown lens; for a certain crown lens, the number of the continuous ink-jet drops in the first circulation is a drops; the number of the droplets continuously jetted at the second circulation is a-b droplets, and the number of the droplets continuously jetted at the third circulation is a-2b droplets.
Finally, a printing starting point is confirmed, ink-jet printing is performed to obtain a plurality of crown lenses arranged in an array, and the crown lenses are cured by ultraviolet light.
S110, coating a layer of photosensitive adhesive on the spare surface of the base film in the crown lens layer, and adhering the crown lens layer surface to the upper surface of the micro prism layer through the photosensitive adhesive by adopting a roll-to-roll process.
S112, preparing a protective film 4 on the upper surface of the coronary lens layer, wherein the protective film specifically comprises the following steps:
preparing a protective film, and introducing a layer of pressure-sensitive adhesive on the lower surface of the protective film; the protective film can be selected from polyethylene film, polyvinyl chloride film, polypropylene film, polyester film, etc., and has a thickness of 30-150 μm.
First, the protective film is attached to the upper surface of the crown lens layer by a pressure sensitive adhesive using a roll-to-roll process.
Secondly, the quantum dot layer 1 is protected to prevent the light emitting effect from being influenced by abrasion caused by the external environment or an adjacent structure; a back coating layer 3 is also prepared on the back surface thereof. The preparation process of the back coating comprises the following steps:
firstly, preparing anti-scratch particles and photosensitive resin, and uniformly dispersing the anti-scratch particles in the photosensitive resin; because the viscosity of the photosensitive resin is relatively high, the good dispersing agent of the anti-scratch particles can be introduced firstly during dispersion, the good dispersing agent is firstly dispersed in the good dispersing agent to obtain a front solution, and then the front solution is added into the photosensitive resin for uniform dispersion. In specific implementation, because the photosensitive resin is an organic substance, the scratch-resistant particles may be organic nanoparticles such as polypropylene particles, silicone particles, polycarbonate particles, or polymethyl methacrylate particles according to the principle of similar compatibility.
Next, the above photosensitive resin in which the scratch resistant particles are dispersed is coated on the back surface of the lower base film through a coating process, and a back coating layer 3 is formed through ultraviolet light curing.
In practical implementation, since the back coating layer 3 is located at the lowest layer of the quantum dot brightness enhancement composite film, the preparation thereof may be performed after the lower base film 11 is prepared in step S102, or the light emitting layer 12 is prepared, or the upper base film 13 is attached, or may be performed after step 104, or step 106, or step 108, or step 110, or step 112 is performed. Since the process of preparing the back coating layer 3 is substantially the same as the process of preparing the light emitting layer 12, it is preferably performed after preparing the lower base film 11 at step S102.
Finally, as shown in fig. 2, the quantum dot brightness enhancement composite film prepared by the embodiment has an average maximum length of 30 microns and an average height of 12 microns on the bottom surface of each crown lens; the average maximum length of the bottom surface of each microprism is 70 micrometers, and the average height is 30 micrometers.
Example 3
Another method for preparing a quantum dot brightness enhancement composite film disclosed in the present invention is further described in detail with reference to the examples shown in fig. 1-4.
The preparation method adopts full-solution coating preparation and comprises the following steps:
s202, preparing a quantum dot layer;
in this step, the preparation process of the quantum dot layer 1 includes:
first, a lower base film 11, specifically a PET base film, having a thickness of 30 to 200 μm is prepared; a PET base film having a thickness of 30 μm was specifically selected in this example.
Secondly, a quantum dot solution for preparing the light emitting layer 12 is prepared; the quantum dot solution comprises red quantum dots, green quantum dots, photosensitive resin and a polar organic solvent; wherein the red quantum dots and the green quantum dots are both oil-soluble quantum dots; the polar organic solvent is a good dispersant of the oil-soluble quantum dots, and the viscosity of the photosensitive resin is high, so that the dispersion uniformity of the red quantum dots and the green quantum dots in the photosensitive resin can be improved by using the polar organic solvent as a medium. Specifically, the preparation process of the quantum dot solution comprises the following steps: firstly, simultaneously adding red quantum dots and green quantum dots in a ratio of 3:1-6:1 into a reagent bottle, and adding a proper amount of polar organic solvent into the reagent bottle by using a liquid extractor so as to ensure that the red quantum dots and the green quantum dots are dispersed in the reagent bottle in an unsaturated state; and the red quantum dots and the green quantum dots are uniformly dispersed in the mixture by magnetic stirring. And then, adding the prepared solution into photosensitive resin, and uniformly dispersing by magnetic stirring to obtain the quantum dot solution.
In order to facilitate the formation of a light-emitting layer, a polar organic solvent introduced into the quantum dot solution is quickly volatilized, wherein the polar organic solvent is a medium-low boiling point solvent, and the boiling point of the solvent is lower than 120 ℃; specifically, the solvent may be one or more selected from toluene, chlorobenzene, octane, decane, etc.
Then, the quantum dot solution is uniformly coated on the surface of the lower base film 11 by a coating process, and a light emitting layer 12 is formed by ultraviolet light curing. When coating is carried out specifically, when the size of the backlight module is larger, a blade coating process is preferably adopted; when the size of the backlight module is small, a spin coating process is preferably adopted.
Finally, adhering a base film 13 on the upper surface of the luminous layer 12 through a roll-to-roll process, wherein the upper base film is a PET base film and has a thickness of 30-200 microns; a PET base film having a thickness of 30 μm was specifically selected in this example.
S204, preparing to carve a plurality of roller shafts of the microprisms arranged in an array mode, coating photosensitive resin on the roller shafts, then transferring the photosensitive resin on the roller shafts to the upper surface of the quantum dot layer through an automatic coating process, and obtaining the microprism layer 21 through ultraviolet light curing;
in the step, the microprisms are formed by photosensitive resin, so that the microprisms have certain fluidity; therefore, in order to ensure that the size of the prepared microprism meets the requirement, the microprism needs to be cured after preparation, and the interval time is less than 1 minute; and adopts larger curing light intensity, specifically 50-70%.
S206, preparing a base film, coating a layer of photosensitive adhesive on the lower surface of the base film, and adhering the base film surface to the upper surface of the micro prism layer through the photosensitive adhesive by adopting a roll-to-roll process;
in this step, the base film 22 is specifically a PET base film, and the thickness thereof is 30 to 200 micrometers; a PET base film having a thickness of 30 μm was specifically selected in this example.
S208, preparing to carve a plurality of roller shafts of the crown lenses arranged in an array, coating photosensitive resin on the roller shafts, then transferring the photosensitive resin on the roller shafts to the upper surface of the base film through an automatic coating process, and obtaining the crown lens layer through ultraviolet light curing.
In the step, the crown lens is formed by photosensitive resin and has certain fluidity; therefore, in order to ensure that the size of the prepared crown lens meets the requirement, the prepared crown lens needs to be cured when the preparation is finished, and the interval time is less than 2 minutes; and the curing strength is higher, specifically 50-70%.
As an alternative embodiment, since the side surface of the crown lens has a spherical structure, the crown lens may be formed by using an inkjet printing process using a plurality of reciprocating depositions and a flow of a photosensitive resin. The method comprises the following specific steps:
firstly, setting a driving pulse of ink-jet printing according to the viscosity and the surface tension of the photosensitive resin; when the viscosity and the surface tension of the photosensitive resin are large and effective ink drops cannot be formed, the viscosity of the photosensitive resin can be reduced by heating the printing nozzle, or the viscosity and the surface tension can be reduced by adding a proper organic solvent into the photosensitive resin; thereby meeting the requirements of viscosity and surface tension in ink-jet printing.
Secondly, setting the number of continuously jetted droplets and the droplet spacing in single circulation of ink-jet printing according to the area of the bottom surface of the crown lens; the number of the droplets and the distance between the droplets of the continuous ink jet are in direct proportion to the size of the bottom surface of the crown lens.
Then, the cycle number of the ink-jet printing is set according to the height of the crown lens; the number of cycles is proportional to the height of the crown lens, and the number of droplets continuously printed per cycle is gradually reduced in the cyclic printing in order to form the spherical shape of the crown lens; for a certain crown lens, the number of the continuous ink-jet drops in the first circulation is a drops; the number of the droplets continuously jetted at the second circulation is a-b droplets, and the number of the droplets continuously jetted at the third circulation is a-2b droplets.
Finally, a printing starting point is confirmed, ink-jet printing is performed to obtain a plurality of crown lenses arranged in an array, and the crown lenses are cured by ultraviolet light.
S210, preparing a protective film 4 on the upper surface of the coronary lens layer, and specifically comprises the following steps:
firstly, preparing a protective film, and introducing a layer of pressure-sensitive adhesive on the lower surface of the protective film; the protective film can be selected from polyethylene film, polyvinyl chloride film, polypropylene film, polyester film, etc., and has a thickness of 30-150 μm.
And secondly, adhering the protective film to the upper surface of the coronary lens layer through a pressure-sensitive adhesive by adopting a roll-to-roll process.
In order to protect the quantum dot layer 1 and prevent the light-emitting effect from being influenced by the abrasion of the external environment or the adjacent structure; a back coating layer 3 is also prepared on the back surface thereof. The preparation process of the back coating comprises the following steps:
firstly, preparing anti-scratch particles and photosensitive resin, and uniformly dispersing the anti-scratch particles in the photosensitive resin; because the viscosity of the photosensitive resin is relatively high, the good dispersing agent of the anti-scratch particles can be introduced firstly during dispersion, the good dispersing agent is firstly dispersed in the good dispersing agent to obtain a front solution, and then the front solution is added into the photosensitive resin for uniform dispersion. In specific implementation, because the photosensitive resin is an organic substance, the scratch-resistant particles may be organic nanoparticles such as polypropylene particles, silicone particles, polycarbonate particles, or polymethyl methacrylate particles according to the principle of similar compatibility.
Then, the above photosensitive resin dispersed with the scratch resistant particles is coated on the back surface of the lower base film through a coating process, and the back coating layer 3 is formed through ultraviolet light curing.
In practical implementation, since the back coating layer 3 is located at the lowest layer of the quantum dot brightness enhancement composite film, the preparation thereof may be performed after the lower base film 11 is prepared in step S202, or the light emitting layer 12 is prepared, or the upper base film 13 is attached, or may be performed after step 204, or step 206, or step 208, or step 210 is performed. Since the process of preparing the back coating layer 3 is substantially the same as the process of preparing the light emitting layer 12, it is preferably performed after preparing the lower base film 11 in step S202.
Finally, as shown in fig. 2, the quantum dot brightness enhancement composite film prepared by the embodiment has an average maximum length of 30 microns and an average height of 12 microns at the bottom surface of each crown lens; the average maximum length of the bottom surface of each microprism is 70 micrometers, and the average height is 30 micrometers.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims (10)

1. A quantum dot brightening composite film is characterized by comprising a quantum dot layer and a composite brightening layer which are superposed; the composite brightness enhancement layer comprises a micro prism layer and a crown lens layer which are superposed; the micro prism layer is deposited on the upper surface of the quantum dot layer and comprises a plurality of micro prisms arranged in an array, the height range of each micro prism is 20-50 micrometers, the vertex angle range is 70-90 degrees, and the distance between every two adjacent micro prisms is 20-40 micrometers; the crown lens layer comprises a base film attached to the micro prism layer and a plurality of crown lenses deposited on the base film, the side surfaces of the crown lenses are spherical, and the bottom surfaces of the crown lenses are circular or regular polygonal; and the height range is 5-15 microns, and the maximum length range of the bottom surface is 25-60 microns.
2. A quantum dot brightness enhancement composite film according to claim 1, wherein the shape of the bottom surface of the crown lens is regular hexagon, and the side length of the bottom surface is in the range of 15 microns to 30 microns.
3. A quantum dot brightness enhancement composite film according to claim 1, wherein the quantum dot layer comprises a lower base film, a light emitting layer and an upper base film in this order; the lower base film and the upper base film are respectively attached to two sides of the light-emitting layer, the light-emitting layer comprises red quantum dots, green quantum dots and photosensitive resin, and the red quantum dots and the green quantum dots are uniformly dispersed in the photosensitive resin.
4. A quantum dot brightness enhancement composite film according to claim 3, comprising a back coating layer deposited on the lower surface of the lower base film and having a thickness in the range of 3 microns to 10 microns; the back coating comprises anti-scratch particles and photosensitive resin, wherein the anti-scratch particles are uniformly dispersed in the photosensitive resin, the particle size of the anti-scratch particles is 50-500 nanometers, and the anti-scratch particles account for 0.1-5 mass percent of the back coating.
5. The quantum dot brightness enhancement composite film according to claim 4, wherein the scratch resistant particles are polypropylene particles, silicone particles, polycarbonate particles or polymethyl methacrylate particles.
6. A quantum dot brightness enhancement composite film according to claim 1, comprising a protective film, wherein a layer of pressure sensitive adhesive is arranged below the protective film, and the protective film is attached to the upper surface of the crown lens layer through the pressure sensitive adhesive.
7. A preparation method of a quantum dot brightness enhancement composite film, which is characterized in that the quantum dot brightness enhancement composite film of claim 1 is prepared by full solution coating, and comprises the following steps:
preparing a quantum dot layer;
preparing a roll shaft for carving a plurality of microprisms arranged in an array, coating photosensitive resin on the roll shaft, then transferring the photosensitive resin on the roll shaft to the upper surface of the quantum dot layer through an automatic coating process, and obtaining the microprism layer through ultraviolet light curing;
preparing a basement membrane;
preparing a roll shaft for engraving a plurality of crown lenses arranged in an array, coating photosensitive resin on the roll shaft, then transferring the photosensitive resin on the roll shaft to the upper surface of the base film through an automatic coating process, and obtaining the crown lens layer through ultraviolet light curing;
and coating a layer of photosensitive adhesive on the spare surface of the base film in the crown lens layer, and adhering the surface of the crown lens layer to the upper surface of the micro prism layer through the photosensitive adhesive by adopting a roll-to-roll process.
8. A preparation method of a quantum dot brightness enhancement composite film, which is characterized in that the quantum dot brightness enhancement composite film of claim 1 is prepared by full solution coating, and comprises the following steps:
preparing a quantum dot layer;
preparing a roll shaft for carving a plurality of microprisms arranged in an array, coating photosensitive resin on the roll shaft, then transferring the photosensitive resin on the roll shaft to the upper surface of the quantum dot layer through an automatic coating process, and obtaining the microprism layer through ultraviolet light curing;
preparing a base film, coating a layer of photosensitive adhesive on the lower surface of the base film, and adhering the base film surface to the upper surface of the micro prism layer through the photosensitive adhesive by adopting a roll-to-roll process;
preparing a roller shaft for carving a plurality of crown lenses arranged in an array, coating photosensitive resin on the roller shaft, then transferring the photosensitive resin on the roller shaft to the upper surface of the base film through an automatic coating process, and obtaining the crown lens layer through ultraviolet light curing.
9. A method for preparing a quantum dot brightness enhancement composite film according to any one of claims 7-8, wherein the crown lenses in the crown lens layer are prepared by ink-jet printing, and the method comprises the following steps:
setting a driving pulse for ink-jet printing according to the viscosity and surface tension of the photosensitive resin;
setting the number of continuously jetted droplets and the droplet spacing in single circulation of ink-jet printing according to the area of the bottom surface of the crown lens;
setting the cycle number of the ink-jet printing according to the height of the crown lens;
determining a printing starting point, carrying out ink-jet printing to obtain a plurality of array-arranged crown lenses, and curing the array-arranged crown lenses by ultraviolet light.
10. A method for preparing a quantum dot brightness enhancement composite film according to any one of claim 9, wherein preparing a protective film on the upper surface of the crown lens layer comprises:
preparing a protective film, and introducing a layer of pressure-sensitive adhesive on the lower surface of the protective film;
and adhering the protective film to the upper surface of the coronary lens layer by a pressure-sensitive adhesive by adopting a roll-to-roll process.
CN202210151854.4A 2022-02-18 2022-02-18 Quantum dot brightening composite film and preparation method thereof Active CN114509897B (en)

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