TW201624024A - Production method for wavelength converting member, wavelength converting member, backlight unit, and liquid crystal display device - Google Patents

Abstract

One embodiment of the present invention relates to a production method for a wavelength converting member, a wavelength converting member, a backlight unit, and a liquid crystal display device. The production method includes a surface treatment step for surface treating a barrier film that has at least one inorganic layer and includes a lamination step for laminating onto the surface-treated surface of the barrier film a wavelength converting layer that contains quantum rods, the surface treatment step being a step wherein a surface treatment composition that includes a water-containing solvent and an organic metal coupling agent is applied to the surface of the inorganic layer of the barrier film.

Description

Method for manufacturing wavelength conversion member, wavelength conversion member, backlight unit, and liquid crystal display device

The present invention relates to a method of fabricating a wavelength converting member, a wavelength converting member, a backlight unit, and a liquid crystal display device. More specifically, the present invention relates to a method for fabricating a wavelength converting member, a wavelength converting member, a backlight unit, and a liquid crystal display device, wherein a wet heat between a wavelength conversion layer containing a quantum dot that emits fluorescence by excitation light and a barrier film is used. The adhesion after the passage of time is good.

A flat panel display such as a liquid crystal display device (hereinafter referred to as an LCD (Liquid Crystal Display)) is used as an image display device that consumes less power and is space-saving, and its use is expanding year by year. The liquid crystal display device is composed of at least a backlight and a liquid crystal cell, and generally includes a member such as a backlight side polarizing plate and an identification side polarizing plate.

In the flat panel display market, as the LCD performance is improved, the color reproducibility is improved. In this regard, quantum dots (Quantum Dot, QD, also referred to as quantum dots) have been attracting attention as luminescent materials in recent years. For example, when the excitation light is incident on the wavelength conversion member including the quantum dot from the backlight, the quantum dot is excited to emit fluorescence. Here, by using quantum dots having different light-emitting characteristics, red light, green light, and blue light can be emitted to realize white light. Use the fluorescence of quantum dots because of the half value The width is small, so the white light obtained is high in brightness, and the color reproducibility is good. By performing a three-wavelength illuminating technique using quantum dots as described above, the color reproduction area is expanded from 72% to 100 for the current High Definition (FHD) (NDC (National Television System Committee). %.

Prior technical literature Patent literature

Patent Document 1 Japanese Patent Laid-Open Publication No. 2011-46046

The wavelength conversion member is a laminated structure in which a barrier film having one or more inorganic layers is provided on one or both of the wavelength conversion layers including the quantum dots (described later on the main surface). However, when the inventors of the present invention actually investigated the wavelength conversion member having the barrier film, it was found that the adhesion between the wavelength conversion layer and the inorganic layer adjacent to the layer was insufficient.

When the adhesion between the wavelength conversion layer and the inorganic layer adjacent to the layer is insufficient, for example, in order to ship the wavelength conversion member as a product, it is cut out to a predetermined size (for example, punched by a punch) When processing is performed, peeling occurs at the interface end portion of the wavelength conversion layer and the inorganic layer. For example, in the case where the inorganic layer is a barrier film of a layer having oxygen barrier properties, when the peeling of the interface end portion occurs as described above, there is a fear that the light-emitting efficiency of the quantum dot is lowered due to oxygen intrusion from the edge portion. Moreover, the adhesion between the wavelength conversion layer and the inorganic layer is insufficient, which is a cause of deterioration in durability of the member due to peeling of the portion between the layers.

In addition, in recent years, when the demand for a flat panel display using a liquid crystal display device or the like is increased in a hot and humid environment, the inventors of the present invention have discovered that the wavelength conversion layer is in a humid and hot environment condition. Further, the adhesion of the inorganic layer adjacent to the layer tends to be further lowered.

On the other hand, there is disclosed a technique of imparting adhesion between layers by adding a decane coupling agent to a monomer layer (for example, refer to Patent Document 1). Patent Document 1 discloses a base film, an organic layer, and an inorganic layer in the following order. The organic layer has a thickness of 300 nm to 2000 nm, and the surface of the organic layer satisfies a predetermined Ra and Rz, and the inorganic layer is SiOx. A laminated film of tantalum oxide (x is 0.9 to 1.5). In this document, it is described that the organic layer contains a decane coupling agent to improve the adhesion between the substrate and the organic layer, the organic layer and the inorganic layer, and to reduce the deterioration of the barrier property due to the peeling failure.

An object of the present invention is to provide a method for producing a wavelength conversion member which is excellent in wet heat between a wavelength conversion layer containing a quantum dot and a barrier film.

In order to solve the above problems, the inventors of the present invention have repeatedly studied and found that the surface of the inorganic layer of the barrier film is previously included with the organic metal coupler before the inorganic layer of the barrier film and the wavelength conversion layer containing the quantum dots are laminated. The composition of the water and the composition of the water are completely different from the composition (the reference example 1 to be described later) in which the wavelength conversion layer of the wavelength conversion member having the barrier film of the configuration of the patent document 1 is added. Improve the adhesion after damp heat and time.

The present invention and preferred aspects thereof as a specific means for solving the above problems are as follows.

[1] A method of producing a wavelength conversion member, comprising: a surface treatment step of surface-treating a barrier film having at least one inorganic layer; and a lamination step of a surface treated on the surface of the barrier film The upper layer contains a wavelength conversion layer of quantum dots; the surface treatment step is a step of imparting a composition for surface treatment comprising a solvent containing water and an organic metal coupling agent to the surface of the inorganic layer of the barrier film.

[2] The method for producing a wavelength conversion member according to [1], wherein the organometallic coupling agent preferably has a reactive functional group at the terminal.

[3] The method for producing a wavelength conversion member according to [1] or [2], wherein the composition for surface treatment contains a surfactant.

[4] The method for producing a wavelength conversion member according to [3], wherein the surfactant is preferably a fluorine-based nonionic surfactant.

[5] The method for producing a wavelength conversion member according to any one of [1] to [4], wherein the solvent for the composition for surface treatment contains an organic solvent.

[6] The method for producing a wavelength conversion member according to any one of [1] to [5] wherein the surface treatment step is a first barrier film having at least one inorganic layer and at least one inorganic layer. a step of separately performing a surface treatment on the second barrier film of the layer, The step of laminating is preferably a step of sandwiching the wavelength conversion layer with a surface treated by each of the first barrier film and the second barrier film.

[7] The method for producing a wavelength conversion member according to [6], which preferably comprises the following steps.

a step of winding the first barrier film and the second barrier film from the roller before the surface treatment step; and the step of winding the wavelength conversion member onto the roller after the laminating step; The unwinding step, the surface treating step, the laminating step, and the winding step are performed in a roll to roll manner.

[8] The method for producing a wavelength conversion member according to any one of [1] to [7] wherein the step of laminating is preferably a coating step of a composition containing quantum dots.

[9] A wavelength conversion member manufactured by the method for producing a wavelength conversion member according to any one of [1] to [8].

[10] A wavelength conversion member comprising a barrier film having at least one inorganic layer formed by surface treatment, and wavelength conversion containing quantum dots directly connected to a surface treated on the surface of the barrier film; In the layer, the surface treatment is applied to the surface of the inorganic layer of the barrier film by a composition for surface treatment comprising a solvent containing water and an organic metal coupling agent.

[11] The wavelength conversion member according to [10], wherein a concentration of the organometallic coupling agent in a surface region of a surface of at least one of the wavelength conversion layers to a distance of 10% or less in a thickness direction is higher than Wavelength conversion The concentration of the organometallic coupling agent in the inner region of the surface of both layers to a distance exceeding 10% in the thickness direction is more preferable.

[12] A backlight unit comprising at least the wavelength conversion member according to any one of [9] to [11], and a light source.

[13] The backlight unit according to [12], wherein the light source has a light-emitting center wavelength in a wavelength band of 430 nm to 480 nm.

[14] A liquid crystal display device comprising at least the backlight unit and the liquid crystal cell of [12] or [13].

According to the present invention, it is possible to provide a method for producing a wavelength conversion member which has good adhesion after wet heat between a wavelength conversion layer containing a quantum dot and a barrier film.

1‧‧‧Backlight unit

1A‧‧‧Light source

1B‧‧‧Light guide plate

1C‧‧‧wavelength conversion member

2‧‧‧Blue light

3‧‧‧Green light

4‧‧‧Red light

10‧‧‧First film

11‧‧‧Polarizer protective film

12‧‧‧ polarizer

13‧‧‧Polarizer protective film

14‧‧‧Backlight side polarizer

20‧‧‧ Coating Department

21‧‧‧Liquid Crystal Unit

22‧‧·coating film

24‧‧‧Mold coating machine

26‧‧‧ Roller

28‧‧‧wavelength conversion layer (hardened layer)

30‧‧‧Layered Department

32‧‧‧Laminated roller

34‧‧‧heating room

36‧‧‧ openings

38‧‧‧ openings

41‧‧‧Polarizer protective film

42‧‧‧ polarizer

43‧‧‧Polarizer protective film

44‧‧‧Display side polarizer

50‧‧‧Second film

51‧‧‧Liquid crystal display device

60‧‧‧ Hardening Department

62‧‧‧ Roller

64‧‧‧UV irradiation device

70‧‧‧wavelength conversion member

80‧‧‧ peeling roller

100‧‧‧Manufacture equipment

P‧‧‧Layer position

1(a) and 1(b) are explanatory views showing an example of a backlight unit including a wavelength conversion member according to an aspect of the present invention.

Fig. 2 is a view showing an example of a liquid crystal display device according to an aspect of the present invention.

3 is a schematic configuration diagram of an example of a manufacturing apparatus of a wavelength conversion member.

Figure 4 is a partially enlarged view of the manufacturing apparatus shown in Figure 3.

[Formation of the Invention]

The following description is based on representative embodiments of the present invention, but the present invention is not limited to such an embodiment. Furthermore, The numerical range expressed by "~" in the present invention and the present specification means a range including the numerical values described before and after "~" as the lower limit and the upper limit.

Further, in the present invention and the present specification, the "half-value width" of the peak means the width of the peak at 1/2 of the peak height. Further, light having a center wavelength of a wavelength in a wavelength band of 400 to 500 nm, preferably in a wavelength band of 430 to 480 nm is referred to as blue light, and light having a center wavelength of light in a wavelength band of 500 to 600 nm is referred to as light. For green light, light having a center wavelength of emission in a wavelength band of 600 to 680 nm is called red light.

[Method of Manufacturing Wavelength Conversion Member]

The method for producing a wavelength converting member of the present invention comprises the steps of: a surface treating step of surface-treating a barrier film having at least one inorganic layer; and a laminating step of surface-treated surface of the barrier film The wavelength conversion layer containing the quantum dots is laminated; the surface treatment step is a step of imparting a surface treatment composition containing a solvent containing water and an organic metal coupling agent to the surface of the inorganic layer of the barrier film.

According to the above configuration, according to the method for producing a wavelength conversion member, it is possible to manufacture a wavelength conversion member having good adhesion between the wavelength conversion layer containing the quantum dots and the barrier film after the wet heat.

Without being bound by any theory, the adhesion between the wavelength conversion layer and the barrier film after moist heat can be treated by surface treatment of the inorganic layer of the barrier film with a composition comprising an organic metal coupling agent and water. Rise. The organic metal coupling agent for improving the reactivity forms a covalent bond with the surface or constituent component of the inorganic layer of the adjacent barrier film by a hydrolysis reaction or a condensation reaction, and a composition containing the organic metal coupling agent and water is prepared in advance. By performing the surface treatment of the inorganic layer of the barrier film, it is possible to suppress the hydrolysis and dehydration condensation of the organic metal coupling agent after the laminated wavelength conversion layer and the barrier film to generate methanol or water.

Preferred embodiments of the method for producing a wavelength converting member of the present invention will be described below.

<surface treatment step>

The method for producing a wavelength conversion member according to the present invention comprises a surface treatment step of surface-treating a barrier film having at least one inorganic layer, and the surface treatment step is a surface treatment comprising a solvent containing water and an organic metal coupling agent. The composition is imparted to the surface of the inorganic layer of the barrier film.

The method of surface treatment using a composition for surface treatment containing a solvent containing water and an organic metal coupling agent is not particularly limited, but from the viewpoint of productivity, surface treatment is performed by continuous rolling on a barrier film. good. Specifically, a method of applying and drying a composition for surface treatment on a barrier film by a continuous rolling method using a coater can be mentioned.

In the method for producing a wavelength converting member of the present invention, the surface treating step is preferably a step of separately surface treating a first barrier film having at least one inorganic layer and a second barrier film having at least one inorganic layer. .

The method for producing a wavelength converting member of the present invention includes the step of separately winding the first barrier film and the second barrier film from the roll before the surface treatment step.

(barrier film)

The wavelength converting member comprises a barrier film. The barrier film is preferably a film having a gas barrier function for isolating oxygen. The barrier film also has a function of isolating water vapor.

The barrier film is preferably included in the wavelength conversion member as a layer adjacent to the wavelength conversion layer or directly connected. Further, the barrier film may have one or two or more wavelength conversion members, and the wavelength conversion member preferably has a structure in which a layered barrier film, a wavelength conversion layer, and a barrier film are sequentially laminated.

In the wavelength conversion member, the wavelength conversion layer may also be formed of a barrier film as a substrate. Further, the barrier film may be used in either or both of the first film and the second film. When both the first film and the second film are barrier films, they may be the same or different.

The barrier film may be any known barrier film, and may be, for example, a barrier film described below.

The barrier film may be a film including a base film and an inorganic layer as long as it contains at least one inorganic layer. Regarding the base film, the description of the support can be referred to. The barrier film may also be a barrier laminate comprising an organic layer comprising at least one inorganic layer and at least one layer on the substrate film. As described above, a plurality of laminated layers can further improve the barrier property, and on the other hand, as the number of laminated layers is increased, the light transmittance of the wavelength converting member tends to decrease, and therefore, good light penetration can be maintained. The range of rates, the increase in the number of layers is better. Specifically, the barrier film has a total light transmittance of 80% or more in the visible light region and an oxygen permeability of 1 cm ³ /(m ² .day.atm) or less. Here, the oxygen permeability is a value measured using an oxygen permeability measuring device (manufactured by MOCON Corporation, OX-TRAN 2/20: trade name) under the conditions of a measurement temperature of 23 ° C and a relative humidity of 90%. Further, the visible light region refers to a wavelength region of 380 to 780 nm, and the total light transmittance indicates an average value of light transmittance in the visible light region.

The oxygen permeability of the barrier film is preferably 0.1 cm ³ /(m ² .day.atm) or less, more preferably 0.01 cm ³ /(m ² .day.atm) or less. The total light transmittance in the visible light region is more preferably 90% or more. The lower the oxygen permeability, the better, and the higher the total light transmittance in the visible light region, the better.

-Inorganic layer -

The "inorganic layer" is a layer containing an inorganic material as a main component, and is preferably a layer formed only of an inorganic material. On the other hand, the organic layer is a layer containing an organic material as a main component, and it is preferable that the organic material accounts for 50% by mass or more, more preferably 80% by mass or more, and particularly preferably 90% by mass or more.

The inorganic material constituting the inorganic layer is not particularly limited, and for example, various inorganic compounds such as a metal or an inorganic oxide, a nitride, or an oxynitride can be used. As an element constituting the inorganic material, lanthanum, aluminum, magnesium, titanium, tin, indium, and antimony are preferable, and one type or two or more types may be contained. Specific examples of the inorganic compound include cerium oxide, cerium oxynitride, aluminum oxide, magnesium oxide, titanium oxide, tin oxide, indium oxide alloy, tantalum nitride, aluminum nitride, and titanium nitride. Further, as the inorganic layer, a metal film such as an aluminum film, a silver film, a tin film, a chromium film, a nickel film, or a titanium film may be provided.

Among the above materials, a compound containing ruthenium nitride, ruthenium oxide or ruthenium oxynitride is particularly preferable, and ruthenium nitride is particularly preferable. Since the inorganic layer containing these materials is excellent in adhesion to the organic layer, the barrier property can be further improved.

The method for forming the inorganic layer is not particularly limited. For example, various film forming methods in which the film forming material can be evaporated or scattered and deposited on the vapor deposited surface can be used.

Examples of the method for forming the inorganic layer include a vacuum vapor deposition method in which an inorganic material such as an inorganic oxide, an inorganic nitride, an inorganic nitrogen oxide or a metal is heated and vapor-deposited, and an inorganic material is used as a raw material. An oxidation reaction vapor deposition method in which oxygen is introduced and oxidized, and vapor deposition is performed; a sputtering method in which an inorganic material is used as a target material, and argon gas or oxygen gas is used for sputtering, and vapor deposition is performed; and an inorganic material is used as a plasma gun When a vapor deposition film of a compound containing ruthenium is formed by a physical vapor phase growth method (Physical Vapor Deposition method) in which a plasma beam is heated and subjected to vapor deposition, an organic ruthenium compound is used as a film. Plasma chemical vapor growth method (Chemical Vapor Deposition method) of raw materials. The vapor deposition may be carried out by using a support, a base film, a wavelength conversion layer, an organic layer or the like as a substrate.

A film containing a ruthenium compound is preferably formed by using a low-temperature plasma chemical vapor phase growth method using an organic ruthenium compound as a raw material. Specific examples of the organic ruthenium compound include 1,1,3,3-tetramethyldioxane, hexamethyldioxane, ethylene trimethylnonane, hexamethyldioxane, and Base decane, dimethyl decane, trimethyl decane, diethyl decane, propyl decane, phenyl decane, ethylene triethoxy decane, tetramethoxy decane, benzene Triethoxy oxane, methyl triethoxy decane, octamethylcyclotetraoxane, and the like. Further, among the above organic ruthenium compounds, tetramethoxy decane (TMOS) or hexamethyldioxane (HMDSO) is particularly preferably used. These are preferred because of the properties of the process or vapor deposited film.

The thickness of the inorganic layer is, for example, 1 nm to 500 nm, preferably 5 nm to 300 nm, and more preferably 10 nm to 150 nm. The film thickness of the inorganic layer can achieve good barrier properties within the above range, and can suppress reflection of the inorganic layer, and can provide a wavelength conversion member having a higher light transmittance.

The contact angle of the inorganic layer with water is, for example, preferably 5 to 70°, more preferably 5 to 55°, and particularly preferably 5 to 35°. The contact angle with the water of the inorganic layer is within the above range, and it is easy to provide the adhesion between the wavelength conversion layer containing the quantum dots and the barrier film after the wet heat, and the inorganic layer in the barrier film is good. The surface wavelength conversion layer does not repel water to form a wavelength conversion member uniformly. The inorganic layer has a low contact angle with water, and its wettability. The coatability is good and preferred.

In the manufacturing method of the present invention, the wavelength converting member includes at least one inorganic layer directly connected to the wavelength conversion layer. It is also preferred that the inorganic layer is directly bonded to both sides of the wavelength conversion layer. However, in the inorganic layer, it is generally difficult to ensure adhesion to the wavelength conversion layer formed of the polymerizable composition containing the organic compound. On the other hand, in the wavelength conversion member formed by laminating the surface of the inorganic layer of the barrier film with a composition containing an organic metal coupling agent and water, and forming a wavelength conversion layer containing a quantum dot, the inorganic layer of the barrier film is formed. The adhesion after the moist heat with the wavelength conversion layer containing the quantum dots is good.

- organic layer -

As the organic layer, reference is made to paragraphs 0020 to 0942 of JP-A-2007-290369, and paragraphs 0074 to 0105 of JP-A-2005-096108. Further, the organic layer preferably contains cardo-polymers. According to the above, the adhesion between the organic layer and the adjacent layer, in particular, the inorganic layer, the adhesion is also improved, and excellent gas barrier properties can be further achieved. For details of the cardo polymer, reference is made to paragraphs 0085 to 0095 of JP-A-2005-096108. The film thickness of the organic layer is preferably in the range of 0.05 μm to 10 μm, and particularly preferably in the range of 0.5 to 10 μm. In the case where the organic layer is formed by a wet coating method, the thickness of the organic layer is in the range of 0.5 to 10 μm, and particularly preferably in the range of 1 μm to 5 μm. Further, in the case of formation by a dry coating method, it is preferably in the range of 0.05 μm to 5 μm, and particularly preferably in the range of 0.05 μm to 1 μm. When the film thickness of the organic layer formed by the wet coating method or the dry coating method is within the above range, the adhesion to the inorganic layer can be further improved.

For a detailed description of the inorganic layer and the organic layer, reference is made to JP-A-2007-290369, JP-A-2005-096108, and even US 2012/0113672 A1.

It is also possible to bond between the organic layer and the inorganic layer, between the two organic layers, or between the two inorganic layers by a known adhesive layer. From the viewpoint of an increase in light transmittance, the lower the layer, the better, and the lower layer is better.

-Other layers, supports -

As described above, the wavelength conversion member has an adjacent layer on at least one of the main surfaces of the wavelength conversion layer. For example, at least one of the group including the inorganic layer and the organic layer may be provided on the main surface of at least one of the wavelength conversion layers. Examples of the inorganic layer and the organic layer as described above include an inorganic layer and an organic layer which constitute a barrier film to be described later. From the viewpoint of maintaining luminous efficiency, it is preferred that at least one of the two main surfaces of the wavelength conversion layer is selected from the group consisting of an inorganic layer and an organic layer. By this layer, it is possible to prevent oxygen, moisture, and the like from intruding from the main surface to the wavelength conversion layer, and it is possible to prevent the quantum dots from deteriorating and the luminous efficiency from deteriorating due to such invasion. Further, in one aspect, the inorganic layer and the organic layer are preferably contained as an adjacent layer directly connected to the main surface of the wavelength conversion layer. Further, by using a composition for surface treatment comprising a solvent containing water and an organic metal coupling agent, the adhesion of the interface between the wavelength conversion layer and the inorganic layer of the barrier film can be improved without the need for a bonding layer, but it cannot be excluded. Then use the layer. The inorganic layer of the barrier film and the wavelength conversion layer may also be bonded to a known adhesive layer.

The wavelength conversion member may have a support for strength improvement, ease of film formation, and the like. The support may be contained as a layer adjacent to or directly connected to the wavelength conversion layer, or may be included as a base film of the barrier film. In the wavelength conversion member, the support layer may be included in the order of the inorganic layer and the support described later, and the wavelength conversion layer, the inorganic layer, the organic layer, and the support may be included in this order. A support may be disposed between the organic layer and the inorganic layer, between the two organic layers, or between the two inorganic layers. Further, the support may include one or two or more wavelength conversion members in the wavelength conversion member. It may have a structure in which a support, a wavelength conversion layer, and a support are laminated in this order. As the support, a transparent support which is transparent with respect to visible light is preferable. Here, the transparency with respect to visible light means that the light transmittance in the visible light region is 80% or more, preferably 85% or more. As the light transmittance used for the transparent scale, the method described in JIS-K7105, that is, the total sphere transmittance and the amount of scattered light, and the total light can be measured using an integrating sphere type light transmittance measuring device. The penetration rate is calculated by subtracting the diffusion transmittance. Regarding the support, reference is made to paragraphs 0046 to 0052 of JP-A-2007-290369, and paragraphs 0040 to 0055 of JP-A-2005-096108. The thickness of the support is in the range of 10 to 500 μm from the viewpoints of gas barrier properties, impact resistance, and the like, and particularly preferably in the range of 20 to 400 μm, particularly preferably in the range of 30 to 300 μm.

The support can also be used as a substrate. Further, the support may be used for either or both of the first film and the second film. When both the first film and the second film are supports, the respective supports may be the same or different.

(composition for surface treatment)

- solvent containing water -

The composition for surface treatment contains a solvent containing water. The solvent for the composition for surface treatment is preferably an organic metal coupling agent.

As a composition for surface treatment, water is required in order to accelerate hydrolysis.

In the method for producing a wavelength conversion member of the present invention, the solvent for the composition for surface treatment preferably contains an organic solvent in the solvent for the surface treatment composition, and a polar solvent is preferred for improving the solubility of the organic metal coupling agent. . Specifically, as a polar solvent, methanol, B The solvent of an alcohol such as an alcohol or isopropyl alcohol or a ketone such as acetone or methyl ethyl ketone is preferred, and the alcohol is more preferable, and ethanol or isopropyl alcohol is particularly preferable. The mixing ratio of the water/polar solvent is preferably from 10/90 to 90/10 by mass, more preferably from 30/70 to 70/30, and particularly preferably from 40/60 to 60/40. If the water is small, the solubility of the organometallic coupling agent can be improved. If it is too much, it can promote the hydrolysis reaction and increase the adhesion.

When the solubility of the organic metal coupling agent containing the solvent of water is insufficient, in order to adjust the pH, it is preferable to add an acid to the solvent of the composition for surface treatment. Specific examples of the acid include acetic acid or boric acid. More acetic acid.

-Organic metal coupling agent -

The composition for surface treatment described above includes an organic metal coupling agent such as a decane coupling agent. Among the organometallic coupling agents, a decane coupling agent and an aluminum coupling agent are preferred, and a decane coupling agent is more preferred.

Further, when the organic metal coupling agent has a reactive functional group such as a radical polymerizable group, it forms a crosslinked structure with the polymerizable compound used for forming the wavelength conversion layer, and can also contribute to the density of the wavelength conversion layer and the inorganic layer. Synergy improvement. From this viewpoint, it is also preferred to use an organic metal coupling agent having a reactive functional group which is excellent in crosslinking reactivity with the polymerizable compound contained in the above composition, and the organic metal coupling agent preferably has a reactive functional group at the terminal. . The inventors of the present invention presumed that by introducing an organic metal coupling agent having a reactive functional group at the terminal, it is possible to react with a polymerizable compound such as an acrylate monomer in the wavelength conversion layer, and to improve the adhesion after moist heat.

Examples of the reactive functional group which the organic metal coupling agent may have include a vinyl group, an epoxy group, a styryl group, a (meth)acryl group, an amine group, a guanidino group, a thiol group, and a thioether group. , isocyanate groups, and the like.

It is also preferable to increase the adhesion by adding an acid generator to be described later to the above composition and forming a wavelength conversion layer by a step of imparting energy for generating a protonic acid. The inventors of the present invention presume that the above reaction is to promote the reaction of the organometallic coupling agent by using a proton acid produced by an acid generator.

The decane coupling agent is not particularly limited, and a known decane coupling agent can be used. From the viewpoint of adhesion, preferred examples of the decane coupling agent include ethylene trichlorodecane, ethylene trimethoxy decane, ethylene triethoxy decane, and 2-(3,4-epoxycyclohexyl)ethyltrimethoxy. Decane, 3-glycidoxypropyltrimethoxydecane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxydecane, 3-glycidoxypropyltrimethoxydecane, 3-glycidoxy Propylmethyldiethoxydecane, 3-glycidoxypropyltriethoxydecane, p-styryltrimethoxydecane, 3-methylpropenyloxypropylmethyldimethoxydecane, 3-methyl Propylene oxypropyltrimethoxy decane, 3-methyl propylene oxiranyl methyl diethoxy decane, 3-methyl propylene oxypropyl triethoxy decane, 3- propylene oxypropyl trimethoxy decane , N-2-(Aminoethyl)-3-aminopropylmethyldimethoxydecane, N-2-(Aminoethyl)-3-aminopropyltrimethoxyoxane, N-2-(Aminoethyl 3-aminopropyltriethoxy decane, 3-aminopropyltrimethoxy decane, 3-aminopropyltriethoxy decane, 3-triethoxydecyl-N-(1,3-dimethyl- Butylene) propylamine and its partial hydrolyzate, 3-trimethoxydecyl-N-(1,3-dimethyl-butylene) propylamine and its partial hydrolyzate, N-phenyl-3-aminopropyltrimethoxydecane, 3-thiolpropylmethyldimethoxydecane, 3-thiolpropyltrimethoxydecane, 3-isocyanatepropyltriethoxydecane, and the like. Among them, a decane coupling agent modified with ethylene, an epoxy group, a (meth) acryloxy group, an amine group or an isocyanate is preferable, and a (meth) acryloxy group and a modified decane coupling agent are particularly preferable. As the decane coupling agent, for example, Shin-Etsu Chemical Co., Ltd. can be used.

In addition, the decane coupling agent represented by the formula (1) described in JP-A-2013-43382 is exemplified as the decane coupling agent. For details, refer to paragraphs 0011 to 0016 of JP-A-2013-43382.

As the other organic metal coupling agent, for example, various coupling agents such as a titanium coupling agent, a zirconium coupling agent, an aluminum coupling agent, and a tin coupling agent can be used.

Examples of the titanium coupling agent include isopropyl triisostearate titanate, isopropyl tri-dodecylbenzenesulfonate titanate, and isopropyl hydrazide (dioctyl pyrophosphate). Ester) titanate, tetraisopropylbis(dioctylphosphite) titanate, tetraoctylbis(di-tridecylphosphite) titanate, tetrakis(2,2-diallyl) Oxymethyl)bis(di-tridecyl)phosphite titanate, bis(dioctylpyrophosphate)oxyacetate titanate, bis(dioctylpyrophosphate)ethene titanate , isopropyl trioctyl decyl titanate, isostearyl methacrylate, isopropyl isostearyl bis acrylate, isopropyl tris(dioctyl phosphate) Titanate, isopropyl triisopropylphenyl phenyl titanate, isopropyl tris(N-amineethyl.amine ethyl) titanate, dicumyl phenyl oxyacetate Titanate, diisostearyl decyl ethylene titanate, and the like.

Examples of the zirconium coupling agent include tetra-n-propoxy zirconium, tetra-butoxy zirconium, zirconium tetraethenyl pyruvate, zirconium dibutoxy bis(ethyl decyl pyruvate), and zirconium tributylate. Oxyethylethyl acetonitrile acetate, zirconium butoxyacetate bis (ethyl acetonitrile acetate), and the like.

Examples of the aluminum coupling agent include aluminum isopropoxide, aluminum single second butoxydiisopropylate, aluminum second butyrate, aluminum ethoxide, and ethyl ethyl b. Indole acetate aluminum diisopropoxide, aluminum ginseng (ethyl acetoacetate), alkyl acetonitrile acetate aluminum diisopropylate, aluminum monoethyl acetonate bis (ethyl acetonitrile) Acid ester), aluminum ginseng (ethylene acetonitrile acetate), and the like.

The organic metal coupling agent is preferably contained in the surface treatment composition in the range of 1 to 80% by mass, more preferably 10 to 10, from the viewpoint of further improving the adhesion between the inorganic layer of the barrier film and the wavelength conversion layer. 70% by mass, particularly preferably 20 to 60% by mass.

- surfactant -

In the method for producing a wavelength conversion member of the present invention, it is preferred that the composition for surface treatment contains a surfactant. When a water-containing solution of an organic metal coupling agent is used as the composition for surface treatment, a surfactant is added to the surface treatment composition from the viewpoint of improving the wettability of the surface of the inorganic layer of the hydrophobic barrier film. It is preferred to reduce the surface tension.

As the surfactant of the present invention, any anionic surfactant, cationic surfactant, amphoteric surfactant, or nonionic surfactant can be used. Moreover, a surfactant containing fluorine is particularly preferred.

Specific examples of the anionic surfactant include, for example, sodium dodecylbenzenesulfonate, sodium lauryl sulfate, sodium alkyl diphenyl ether disulfonate, sodium alkylnaphthalenesulfonate, and dialkylsulfonium amber. Sodium, sodium stearate, potassium oleate, sodium dioctylsulfosuccinate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, dialkyl sulfonate Sodium succinate, sodium stearate, sodium oleate, trioctylphenoxyethoxypolyethoxyethyl sulfate, and the like may be used alone or in combination of two or more.

Specific examples of the nonionic surfactant include polyoxyethylene lauryl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene oleyl phenyl ether, polyoxyethylene decyl phenyl ether, and oxyethylene. The oxypropylene block copolymer, the third octylphenoxyethylpolyethoxyethanol, the nonylphenoxyethylpolyethoxyethanol, or the like may be used alone or in combination of two or more.

The cationic surfactant may, for example, be a tetraalkylammonium salt, an alkylamine salt, a benzdimethylammonium salt, an alkylpyridinium salt or an imidazolium salt. Specifically, for example, dihydroxyethyl ten Octamine, 2-heptadecenyl-hydroxyethyl imidazoline, lauryl trimethylbenzylammonium chloride, cetylpyridinium chloride, stearylamine methyl chloride pyridine, and the like.

Examples of the fluorine-containing surfactant include F-114 F-410 manufactured by DIC Corporation as an anionic surfactant, F-444, F-553, F-556, F-559, F-567, F-. 569, R-94, etc. are used as nonionic surfactants.

In the method for producing a wavelength conversion member of the present invention, the surfactant is preferably a fluorine-based nonionic surfactant.

-Reaction accelerator -

The composition for surface treatment may contain the components described above and the reaction accelerator. The reaction accelerator means a compound that promotes an organic metal coupling reaction. An acid generator is mentioned as a reaction accelerator. Examples of the acid generator include an acid generator that generates protonic acid by energy application. The composition for surface treatment may also include an acid generator that generates protonic acid by energy application. The acid generator is usually a compound or a salt containing an ionic portion of the anion portion X ^- and the cation portion Y ⁺ , which is decomposed by energy supply, and the proton H ⁺ is extracted from the solvent or the acid generator itself to produce protonic acid XH. . Here, the protonic acid means a compound which can release proton H ⁺ .

The energy supply method for producing protonic acid from the acid generator is not particularly limited, and examples thereof include irradiation with active energy rays such as light irradiation, heat treatment, radiation, and electromagnetic waves. Light irradiation and heat treatment are preferred. That is, as the acid generator, a group selected from the group consisting of a photoacid generator and a thermal acid generator is preferred. The light to be irradiated with energy to the photo-acid generator is, for example, an ultraviolet ray. However, the wavelength of the light to be irradiated is not particularly limited as long as the acid generator contained in the composition can be irradiated with light of protonic acid. In addition, the energy-imparting conditions, for example, the light-irradiation conditions and the heating conditions, are not particularly limited as long as the acid generator contained in the composition can generate protonic acid.

Examples of the photoacid generator include a guanidine salt such as a diazonium salt, an ammonium salt, a phosphonium salt, a phosphonium salt, a phosphonium salt, a selenium salt or a phosphonium salt, an organic halogen compound, an organic metal/organic halide, and o. a compound represented by a photoacid generator such as a nitrobenzyl group-protecting group or an imine disulfonate, which is photodecomposed to generate a sulfonic acid, a diterpene compound, a diazoxide oxime, a diazodiamine compound, or the like. Also, three Classes, fourth-order ammonium salts, diazomethane compounds, sulfhydrazine sulfonate compounds, sulfonium sulfonate compounds.

Further, a group which generates an acid by light or a compound which introduces a compound into a main chain or a side chain of a polymer can be used.

Furthermore, it can also be used in VNRPillai, Synthesis, (1), 1 (1980), A. Abad et al., Tetrahedron Lett., (47) 4555 (1971), DHR Barton et al., J. Chem. .Soc., (C), 329 (1970), U.S. Patent No. 3,779,778, European Patent No. 126,712, et al.

In addition, as a photo-acid generator, the photoacid generator <A-1> - <A-4> of [0076] - [0102] of Unexamined-Japanese-Patent No. 2008-162952 is mentioned.

As a thermal acid generator, the salt containing an acid and an organic base is mentioned.

Examples of the acid include organic acids such as sulfonic acid, phosphonic acid, and carboxylic acid, and inorganic acids such as sulfuric acid and phosphoric acid. From the viewpoint of compatibility with the matrix, the organic acid is more preferable, the sulfonic acid and the phosphonic acid are particularly preferable, and the sulfonic acid is most preferable. Preferred examples of the sulfonic acid include p-toluenesulfonic acid (PTS), benzenesulfonic acid (BS), p-dodecylbenzenesulfonic acid (DBS), and p-chlorobenzenesulfonic acid (CBS). 4-naphthalenedisulfonic acid (NDS), methanesulfonic acid (MsOH), fluorofluorobutane-1-sulfonic acid (NFBS), etc., and any of them should be used (() is abbreviated).

When the basicity of the organic base which forms a salt with an acid is represented by pKa of the conjugate acid, the pKa is preferably 5.0 to 10.5, more preferably 6.0 to 10.0, and particularly preferably 6.5 to 10.0. The value of the pKa of the organic base, since the value in the aqueous solution is described in the Basic Manual of the Chemical Handbook (Revised 5th Edition, edited by the Chemical Society of Japan, Maruzen, 2004), Vol. 2, pp. 334-340, so it can be An organic base having the appropriate pKa is selected. Further, a compound which is not presumed to be described in the above document and which is structurally appropriate in pKa can be suitably used. The compound having an appropriate pKa described in the above document is shown in Table 1 below, but the present invention is not limited thereto.

On the other hand, in the case where the boiling point of the organic base is low, the acid generation efficiency at the time of heating is high, and it is preferable from the viewpoint of promoting the reaction of the organic metal coupling agent. Therefore, it is preferred to use an organic base having a suitable boiling point. The boiling point of the organic base is preferably 120 ° C or lower, more preferably 80 ° C or lower, and particularly preferably 70 ° C or lower.

Specific examples of the thermal acid generator include, for example, the following compounds, but are not limited thereto. ( ) The internal system indicates the boiling point.

B-3: pyridine (115 ° C), b-14: 4-methyl Porphyrin (115 ° C), b-20: diallylmethylamine (111 ° C), b-19: triethylamine (88.8 ° C), b-21: third butyl methylamine (67 ~ 69 ° C), b- 22: dimethylisopropylamine (66 ° C), b-23: diethylmethylamine (63 to 65 ° C), b-24: dimethylethylamine (36 to 38 ° C).

The boiling point of the organic base is preferably 35 ° C or more and 120 ° C or less, more preferably 40 ° C or more and 115 ° C or less.

The above thermal acid generator may be used alone or in combination with an acid and an organic base, or may be mixed with an acid and an organic base to form a salt in a solution, and a solution thereof may be used. Further, only one type of acid or organic base may be used, or a plurality of types may be used in combination. When the acid and the organic base are mixed, the equivalent ratio of the acid to the organic base is 1:0.9 to 1.5, and the mixture is preferably mixed, and the mixture is preferably 1:0.95 to 1.3, and the mixture is more preferably 1:1.0 to 1.1. .

The molecular weight of the protonic acid (the aforementioned XH) produced by the energy supply of the acid generator is not particularly limited. Although it is considered that the reaction of the organometallic coupling agent is promoted by the generated protonic acid, the reaction is carried out at the interface with the adjacent layer to improve the adhesion of the interface between the wavelength conversion layer and the adjacent layer, which is preferable. Therefore, the inventors of the present invention presumed that the protonic acid produced was a lower molecular weight, and the mobility in the wavelength conversion layer was good and preferable. From this viewpoint, the molecular weight of the proton acid to be produced is preferably 500 or less, more preferably 300 or less, particularly preferably 200 or less, and most preferably 100 or less. The lower limit of the molecular weight is, for example, 30 or more, but is not particularly limited.

The acid generator described above may be contained in an amount of 0.01 to 30 parts by mass, preferably 0.1 to 20 parts by mass, more preferably 0.5 to 5 parts by mass per 100 parts by mass of the total amount of the polymerizable compound. Share.

<Lamination step>

The method for producing a wavelength conversion member according to the present invention includes a lamination step of laminating a wavelength conversion layer containing quantum dots on a surface treated on the surface of the barrier film.

In the method for producing a wavelength conversion member of the present invention, the step of laminating is preferably a coating step of a composition containing quantum dots. The composition containing the quantum dots is a polymerizable composition containing quantum dots, and it is more preferable to polymerize (harden) the polymerizable composition containing the quantum dots after coating. In the following, a representative example of a preferred embodiment of a polymerizable composition containing quantum dots as a layer forming step using a composition containing quantum dots will be described, but a layering step using a composition containing quantum dots is used. The preferred aspect is not limited to a polymerizable composition containing quantum dots.

Examples of the coating method of the composition containing the quantum dots include a shower coating method, a dip coating method, a spin coating method, a printing coating method, a spray coating method, a slit coating method, a roll coating method, a slip coating method, and the like. A known coating method such as a knife coating method, a gravure coating method, or a wire bar method.

Further, the curing conditions can be appropriately set depending on the type of the polymerizable compound to be used or the composition of the polymerizable composition. Further, when the polymerizable composition containing the quantum dots is a composition containing a solvent, a drying treatment may be performed to remove the solvent before the polymerization treatment.

The wavelength conversion layer is preferably a layer formed by subjecting the above polymerizable composition containing quantum dots to a polymerization treatment. The polymerization treatment of the polymerizable composition containing quantum dots can be carried out by light irradiation or heating.

When the composition for surface treatment contains a reaction accelerator such as an acid generator, the method of imparting energy to the acid generator for the polymerization treatment of the polymerizable composition containing quantum dots and the composition for surface treatment is not particularly limited. . For example, the acid generator is a photoacid generator, and in the aspect in which the polymerization treatment of the polymerizable composition is carried out by light irradiation, energy is imparted. And the polymerization treatment can be carried out simultaneously, or as a single step. This section relates to the fact that the acid generator is a thermal acid generator, and the polymerization treatment is carried out by heating. On the other hand, the acid generator is a thermal acid generator, and in the aspect in which the polymerization treatment is carried out by light irradiation, energy application (heating) and polymerization treatment (light irradiation) are sequentially performed as separate steps. This section is also about the case where the acid generator is a photoacid generator, and the polymerization treatment is carried out by heating. When the energy supply and the polymerization treatment are carried out in a separate step as described above, it is preferred to carry out the polymerization treatment after the energy is supplied. The polymerization treatment after the reaction of promoting the promotion of the organic metal coupling agent by energy can contribute to further improvement in the adhesion between the wavelength conversion layer and the inorganic layer. In addition, when the energy is applied by the light irradiation together with the polymerization treatment, even if the light irradiation conditions (for example, the wavelength of the light to be irradiated) for energy application are different from those of the polymerization processor, for the same reason, after the light irradiation for the energy is applied, It is preferred to perform light irradiation for the polymerization treatment. When this part of the energy is supplied by heating together with the polymerization treatment, the heating conditions for the energy supply are different from the heating conditions for the polymerization treatment.

In the method for producing a wavelength conversion member according to the present invention, from the viewpoint of improving the barrier properties of the wavelength conversion member, the step of laminating is to sandwich the wavelength conversion by the surface treated by the respective surfaces of the first barrier film and the second barrier film. The steps of the layer are better.

In one aspect of the method for producing a wavelength conversion member of the present invention, the polymerization treatment of the polymerizable composition containing quantum dots can be carried out in a state in which the composition is sandwiched between two substrates. An aspect of the manufacturing steps of the wavelength conversion member including the polymerization treatment will be described with reference to the drawings. However, the present invention is not limited to the following aspects.

3 is a schematic configuration diagram of an example of a manufacturing apparatus 100 of a wavelength conversion member, and FIG. 4 is a partially enlarged view of the manufacturing apparatus shown in FIG. 3. An aspect of the manufacturing method of the present invention is a manufacturing step including at least a wavelength converting member using the manufacturing apparatus 100 shown in Figs.

a step of forming a coating film by coating a polymerizable composition containing quantum dots on the surface of a first substrate (hereinafter also referred to as "first film") which is continuously conveyed, and a second substrate which is continuously conveyed on the coating film ( Hereinafter, the "second film" is laminated (overlapped), and the coating film is sandwiched between the first film and the second film; and the film is sandwiched between the first film and the second film. One of the film and the second film is wound around a roller, and is irradiated with light while being continuously conveyed to polymerize and cure the coating film to form a wavelength conversion layer (hardened layer).

By using an inorganic layer (preferably an inorganic layer having barrier properties against oxygen or moisture) as a barrier film of either the first substrate or the second substrate, a single-sided barrier film (barrier layer) can be obtained. Protected wavelength conversion component. Further, by using the barrier film as the first substrate and the second substrate, respectively, a wavelength conversion member protected by a barrier film (barrier layer) on both surfaces of the wavelength conversion layer can be obtained.

More specifically, first, the first film 10 is continuously conveyed to the coating unit 20 from an unillustrated output machine. The first film 10 is output from the output machine, for example, at a conveying speed of 1 to 50 m/min. However, it is not limited to this conveyance speed. At the time of output, for example, a tension of 20 to 150 N/m is applied to the first film 10, preferably a tension of 30 to 100 N/m.

In the coating unit 20, a polymerizable composition containing quantum dots (hereinafter also referred to as "coating liquid") is applied to the surface of the first film 10 that is continuously conveyed to form a coating film 22 (see FIG. 2). In the coating unit 20, for example, a die coater 24 and a idler 26 disposed to face the die coater 24 are provided. The surface of the first film 10 opposite to the surface on which the coating film 22 is formed is wound around the idler 26, and the coating liquid is applied from the discharge port of the die coater 24 on the surface of the first film 10 that is continuously conveyed to form a coating film 22. . Here, the coating film 22 refers to a composition containing quantum dots before the polymerization treatment applied on the first film 10.

In the embodiment of the present embodiment, the die coater 24 to which the extrusion coating method is applied is referred to as a coating device, but is not limited thereto. For example, a coating apparatus using various methods such as a curtain coating method, an extrusion coating method, a bar coating method, or a roll coating method can be used.

The first film 10 on which the coating film 22 is formed by the coating portion 20 is continuously conveyed to the laminated portion 30. In the laminated portion 30, the second film 50 continuously conveyed is laminated on the coating film 22, and the coating film 22 is sandwiched between the first film 10 and the second film 50.

In the laminated portion 30, a buildup drum 32 and a heating chamber 34 surrounding the buildup drum 32 are provided. An opening 36 for passing the first film 10 and an opening 38 for passing the second film 50 are provided in the heating chamber 34.

A roller 62 is disposed at a position facing the laminated drum 32. The surface of the first film 10 on which the coating film 22 is formed, which is opposite to the surface on which the coating film 22 is formed, is wound around the idler 62 and continuously conveyed to the layering position P. The laminate position P means that the contact of the second film 50 with the coating film 22 begins. position. The first film 10 is preferably wound around the idler 62 before reaching the buildup position P. It is assumed that when the first film 10 is wrinkled, the idler 62 can also be used to correct and remove the wrinkles until reaching the laminated position P. Therefore, it is preferable that the first film 10 is wound around the idler 62 (contact position) and the distance L1 from the laminated position P is longer, for example, 30 mm or more is preferable, and the upper limit thereof is usually based on the diameter of the idler 62. Determined with the rolling line.

In the embodiment of the present embodiment, the second film 50 is laminated by the idler 62 and the buildup drum 32 used in the polymerization processing unit 60. In other words, the idler 62 used in the polymerization processing unit 60 also serves as a roller used for the laminated portion 30. However, the present invention is not limited to the above-described embodiment, and a roller for laminating layers different from the idler 62 may be provided in the laminated portion 30 instead of the idler 62.

By using the idler 62 used in the polymerization processing unit 60 in the laminated portion 30, the number of rollers can be reduced. Further, the idler 62 can also be used as a heating roller for the first film 10.

The second film 50 output from the output unit (not shown) is wound around the build-up roll 32 and continuously conveyed between the build-up roll 32 and the idler 62. The second film 50 is laminated on the coating film 22 formed on the first film 10 at the lamination position P. Accordingly, the coating film 22 can be sandwiched by the first film 10 and the second film 50. The layering means that the second film 50 is laminated on the coating film 22.

The distance L2 between the build-up roll 32 and the idler roller 62 is preferably equal to or greater than the total thickness of the first film 10, the wavelength conversion layer (hardened layer) 28 which cures and cures the coating film 22, and the total thickness of the second film 50. Further, L2 is a total thickness of the first film 10 and the coating film 22 and the second film 50 plus 5 mm. The length below is preferred. By making the distance L2 equal to or less than the total thickness of 5 mm, it is possible to prevent the foam from intruding between the second film 50 and the coating film 22. Here, the distance L2 between the buildup roller 32 and the idler roller 62 means the shortest distance between the outer circumferential surface of the buildup roller 32 and the outer circumferential surface of the idler roller 62.

The rotation accuracy of the buildup drum 32 and the idler 62 is not less than 0.05 mm, and preferably not more than 0.01 mm. The smaller the radial dimension deviation, the smaller the thickness distribution of the coating film 22.

Moreover, in order to suppress thermal deformation after the coating film 22 is sandwiched between the first film 10 and the second film 50, the difference between the temperature of the idler 62 of the polymerization processing unit 60 and the temperature of the first film 10, and the temperature of the idler 62 are suppressed. The difference from the temperature of the second film 50 is preferably 30 ° C or lower, more preferably 15 ° C or lower, and most preferably the same.

In order to reduce the difference from the temperature of the idler 62, in the case where the heating chamber 34 is provided, it is preferable to heat the first film 10 and the second film 50 in the heating chamber 34. For example, in the heating chamber 34, the hot air is supplied by a hot air generator (not shown), and the first film 10 and the second film 50 can be heated.

The first film 10 can also be heated by the idler roller 62, and the first film 10 can be heated by the idler 62.

On the other hand, regarding the second film 50, the second film 50 can be heated by the build-up roll 32 by using the build-up roll 32 as a heating roll.

However, the heating chamber 34 and the heating roller are not necessary and may be provided as needed.

Then, the coating film 22 is sandwiched between the first film 10 and the second film 50, and is continuously conveyed to the polymerization processing unit 60. In the aspect shown in the drawing, the polymerization treatment of the polymerization processing unit 60 is performed by light irradiation, but when the polymerizable compound contained in the polymerizable composition containing the quantum dots is polymerized by heating, the warm air can be utilized. The polymerization is carried out by heating such as blowing. Moreover, when energy is supplied by a polymerization process and a single step, energy is supplied by the polymerization processing unit 60. On the other hand, when the energy supply and the polymerization treatment are carried out in another step, it is preferable to carry out energy supply before the polymerization treatment for the reasons described above.

A light irradiation device 64 is provided at a position where the idler 62 and the idler 62 face each other. The first film 10 and the second film 50 that sandwich the coating film 22 between the idler roller 62 and the light irradiation device 64 are continuously conveyed. The light to be irradiated by the light irradiation device may be determined according to the type of the photopolymerizable compound contained in the polymerizable composition containing the quantum dots, and examples thereof include ultraviolet rays. Here, ultraviolet light means light having a wavelength of 280 to 400 nm. As the light source that generates ultraviolet rays, for example, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, or the like can be used. The amount of light irradiation may be set to a range in which polymerization curing of the coating film is possible. For example, ultraviolet rays having an irradiation amount of 100 to 10000 mJ/cm ^{2 may} be irradiated toward the coating film 22 as an example.

In the polymerization processing unit 60, the first film 10 and the second film 50 are sandwiched between the first film 10 and the second film 50, and the first film 10 is wound around the idler 62, and light is irradiated from the light irradiation device 64 while being continuously conveyed. The coating film 22 is cured to form a wavelength conversion layer (hardened layer) 28.

In the embodiment of the present embodiment, the first film 10 side is wound around the idler 62 and continuously conveyed. However, the second film 50 may be wound around the idler 62 and continuously conveyed.

The winding on the idler 62 means a state in which either of the first film 10 and the second film 50 is in contact with the surface of the idler 62 at a certain angle. Therefore, during the continuous conveyance, the first film 10 and the second film 50 move in synchronization with the rotation of the idler 62. The winding of the idler 62 may be performed during at least a period in which the ultraviolet ray is irradiated.

The idler 62 is a main body having a cylindrical shape and a rotating shaft disposed at both end portions of the main body. The body of the idler 62, for example, has The diameter of 200~1000mm. About the diameter of the idler 62 There are no special restrictions. Diameter considering the crimp deformation of the laminated film, equipment cost, and rotation accuracy 300~500mm is preferred. The temperature of the idler 62 can be adjusted by mounting a temperature regulator on the body of the idler 62.

The temperature of the idler 62 can be determined in consideration of heat generation during light irradiation, curing efficiency of the coating film 22, and generation of wrinkles on the idler 62 of the first film 10 and the second film 50. The idler 62 is, for example, preferably set to a temperature range of 10 to 95 ° C, more preferably 15 to 85 ° C. Here, the temperature with respect to the drum means the surface temperature of the drum.

The distance L3 between the laminated position P and the light irradiation device 64 can be, for example, 30 mm or more.

The coating film 22 is irradiated with light to form the hardened layer 28, and the wavelength conversion member 70 including the first film 10, the cured layer 28, and the second film 50 is produced. The wavelength conversion member 70 is peeled off from the idler roller 62 by the peeling roller 80. The wavelength conversion member 70 is continuously conveyed to a winder (not shown), and then the wavelength conversion member 70 is wound into a roll shape by a winder.

Although one aspect of the manufacturing procedure of the wavelength conversion member has been described above, the present invention is not limited to the above. For example, a composition containing a quantum dot may be applied to a substrate, and a substrate may be further laminated thereon, and if necessary, a drying treatment may be carried out, followed by a polymerization treatment to prepare a wavelength conversion layer (hardened layer). In the wavelength conversion layer to be produced, another layer of one or more layers such as a barrier layer may be laminated by a known method.

The total thickness of the wavelength conversion layer is preferably in the range of 1 to 500 μm, more preferably in the range of 100 to 400 μm. Further, the wavelength conversion layer may have a laminated structure of two or more layers, or may include quantum dots exhibiting two or more different light-emitting characteristics in the same layer. When the wavelength conversion layer is a laminate of a plurality of layers of two or more layers, the thickness of one layer is preferably in the range of 1 to 300 μm, more preferably in the range of 10 to 250 μm, and particularly preferably in the range of 30 to 150 μm.

(composition containing quantum dots)

The composition containing quantum dots includes quantum dots that emit fluorescence by excitation with excitation light.

The wavelength conversion layer can be formed from a composition containing quantum dots, for example, by a coating method. The composition containing the quantum dots is preferably a polymerizable composition containing quantum dots further containing a polymerizable compound. When a polymerizable composition containing a quantum dot is used, specifically, a polymerizable composition (curable composition) containing a quantum dot is applied onto a substrate or the like, and then a curing treatment can be performed by light irradiation or the like. The way to get the wavelength conversion layer.

Hereinafter, the composition containing the above quantum dots will be described in more detail.

- Quantum dots -

The composition containing the quantum dots described above includes at least one type of quantum dot, and may contain two or more kinds of quantum dots having different luminescent properties. Among the known quantum dots, there are quantum dots A having an emission center wavelength in a wavelength band of 600 nm to 680 nm, and quantum dots B having an emission center wavelength in a wavelength band of 500 nm to 600 nm, at 400 nm to 500 nm. The wavelength band has a quantum dot C having an emission center wavelength. The quantum dot A emits red light by excitation light, the quantum dot B emits green light, and the quantum dot C emits blue light. For example, when blue light is incident on the wavelength conversion layer including the quantum dot A and the quantum dot B as excitation light, red light emitted from the quantum dot A, green light emitted from the quantum dot B, and blue transmitted through the wavelength conversion layer are used. The shade of light gives off white light. Alternatively, by using ultraviolet light as the excitation light in the wavelength conversion layer including the quantum dots A, B, and C, the red light emitted from the quantum dot A, the green light emitted by the quantum dot B, and the quantum dot C are emitted. Blue light can appear white light. As the quantum dot, there is no limitation, and a manufacturer and a commercially available product can be used by a known method. For the quantum dot, for example, reference is made to paragraphs 0060 to 0066 of JP-A-2012-169271, but it is not limited to those described herein. The wavelength of the quantum dots can be adjusted according to the composition, size, and composition and size of the particles.

The quantum dot may be mixed with other components in the state of particles when the composition containing the above quantum dots is prepared, or may be mixed in a state of being dispersed in a dispersion of the solvent. From the viewpoint of suppressing aggregation of the particles of the quantum dots, it is preferably added in the state of the dispersion. The solvent used herein is not particularly limited. The quantum dot system may be added in an amount of, for example, about 0.01 to 10 parts by mass based on 100 parts by mass of the total amount of the composition containing the quantum dots.

The specific aspect of the wavelength conversion of the wavelength conversion member including the above quantum dots will be described with reference to the following drawings. However, the present invention is not limited to the specific aspects described below.

Fig. 1 is an explanatory view showing an example of a backlight unit 1 including a wavelength conversion member according to an aspect of the present invention. In FIG. 1, the backlight unit 1 includes a light source 1A and a light guide plate 1B as a surface light source. In the example shown in FIG. 1(a), the wavelength conversion member is disposed on the path of the light emitted from the light guide plate. On the other hand, in the example shown in FIG. 1(b), the wavelength conversion member is disposed between the light guide plate and the light source.

Then, in the example shown in FIG. 1(a), the light emitted from the light guide plate 1B is incident on the wavelength conversion member 1C. In the example shown in Fig. 1(a), the light 2 emitted from the light source 1A disposed at the edge of the light guide plate 1B is blue light, and the surface on the liquid crystal cell (not shown) side of the light guide plate 1B is emitted toward the liquid crystal cell. . The wavelength conversion member 1C disposed on the path of the light (blue light 2) emitted from the light guide plate 1B includes at least a quantum dot A which is excited by the blue light 2 and emits red light 4, and is excited by the blue light 2 to emit green. Quantum point B of light 3. As described above, the excited green light 3 and the red light 4 and the blue light 2 transmitted through the wavelength conversion member 1C are emitted from the backlight unit 1. Thus, white light can be emitted by emitting red light, green light, and blue light.

The example shown in Fig. 1(b) is the same as the one shown in Fig. 1(a) except for the portion where the wavelength conversion member and the light guide plate are disposed differently. In the example shown in FIG. 1(b), the excited green light 3 and the red light 4 and the blue light 2 transmitted through the wavelength conversion member 1C are emitted from the wavelength conversion member 1C, and are incident on the light guide plate to realize the surface light source.

- Polymeric compound -

In the wavelength conversion layer formed by using the polymerizable composition containing a quantum dot as the composition containing the quantum dot, the quantum dot is preferably contained in a matrix (polymer) in which a polymerizable compound is polymerized by light irradiation or the like.

The shape of the wavelength conversion layer is not particularly limited. For example, the wavelength conversion layer and the wavelength conversion member including the layer are in the form of a sheet to a film.

As the polymerizable compound, a polymerizable compound of various polymerization forms such as a radical polymerizable compound, a cationically polymerizable compound, or an anionic polymerizable compound can be used. Further, the polymerizable compound may be used singly or in combination of two or more. The content of the polymerizable compound in the total amount of the above composition is preferably from about 10 to 99.99% by mass. As an example of a preferable polymerizable compound, a monofunctional or polyfunctional (meth)acrylate monomer, a polymer thereof, and prepolymerization are mentioned from the viewpoint of transparency, adhesiveness, etc. of the cured film after hardening. Monofunctional or polyfunctional (meth) acrylate compounds. Further, in the present invention and the present specification, the description of "(meth) acrylate" is used in the sense of at least one or both of acrylate and methacrylate. "(Meth)acrylonitrile" is also the same.

Examples of the monofunctional (meth) acrylate compound include acrylic acid and methacrylic acid, and derivatives thereof. More specifically, there is a polymerizable unsaturated group having one (meth)acrylic acid in the molecule. A compound of a bond ((meth)acrylinyl). Specific examples of these include the following compounds, but the present invention is not limited thereto.

Examples thereof include methyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isodecyl (meth)acrylate. (meth)acrylic acid alkyl (meth)acrylate having an alkyl group such as n-octyl (meth)acrylate, lauryl (meth)acrylate or stearyl (meth)acrylate; (meth)acrylic acid; An alkoxy group having 7 to 20 carbon atoms in an aralkyl group such as benzyl ester; an alkoxy group having a carbon number of 2 to 30 in an alkoxyalkyl group such as butoxyethyl (meth)acrylate; (meth)acrylic acid alkyl ester; (meth)acrylic acid (meth)acrylic acid N,N-dimethylamine ethyl ester or the like (monoalkyl or dialkyl) amine alkyl group having a total carbon number of 1 to 20 (meth)acrylic acid Aminoalkyl ester; (meth) acrylate of diethylene glycol diethyl ether, (meth) acrylate of triethylene glycol butyl ether, (meth) acrylate of tetraethylene glycol monomethyl ether, hexaethylene glycol (meth) acrylate of monomethyl ether, monomethyl ether (meth) acrylate of octaethylene glycol, monomethyl ether (meth) acrylate of nonaethylene glycol, monomethyl ether of dipropylene glycol (methyl Acrylate, monomethyl ether (meth) acrylate of heptapropanediol, single B of tetraethylene glycol a (meth) acrylate of a polyalkylene glycol alkyl ether having a carbon number of from 1 to 10 and a terminal alkyl ether having a carbon number of from 1 to 10, such as an ether (meth) acrylate; a (meth) acrylate of a polyalkylene glycol aryl ether having a carbon number of from 1 to 30 and a terminal aromatic ether having a carbon number of from 6 to 20; Cyclohexyl acrylate, dicyclopentanyl (meth) acrylate, isodecyl (meth) acrylate, methylene oxide, cyclohexatriene (meth) acrylate, etc. a fluorinated (meth) acrylate having a total carbon number of 4 to 30 in an alicyclic structure of 4 to 30; a fluorinated (meth) acrylate having a total carbon number of 4 to 30, such as decyl fluoride (meth) acrylate; ) 2-hydroxyethyl acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, mono (meth) acrylate of triethylene glycol, tetraethylene glycol mono (meth)acrylic acid, hexaethylene glycol mono(meth)acrylate, octapropylene glycol mono(meth)acrylate, glycerol mono- or di(meth)acrylate, etc. Ethylene ester (meth) acrylate, etc. Acrylate; tetraethylene glycol mono (meth) acrylate, hexaethylene glycol mono (meth) acrylate, octapropylene glycol mono (meth) acrylate, etc., the alkyl chain has a carbon number of 1 to 30 Polyethylene glycol mono (meth) acrylate; (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, 2- Hydroxyethyl (meth) acrylamide, propylene sulfhydryl (Meth) acrylamide such as phenyl.

As the monofunctional (meth) acrylate compound, a (meth)acrylic acid alkyl ester having 4 to 30 carbon atoms is preferably used, and a carbon number of 12 to 22 (methyl) is used from the viewpoint of improving the dispersibility of quantum dots. The alkyl acrylate is more preferred. As the dispersion of quantum dots increases, the amount of light from the wavelength conversion layer to the exit surface increases, so that the front luminance and front contrast are improved. Specifically, as a monofunctional (meth) acrylate compound, butyl (meth) acrylate, octyl (meth) acrylate, lauryl (meth) acrylate, (meth) acrylate, (methyl) ) stearyl acrylate, behenyl (meth) acrylate, butyl (meth) acrylamide, octyl (meth) acrylamide, lauryl (meth) acrylamide, oil based (A The base is preferably acrylamide, stearyl (meth) acrylamide, behenyl (meth) acrylamide or the like. Among them, lauryl (meth)acrylate, (meth)acrylic acid ester, and stearyl (meth)acrylate are particularly preferred.

A monomer having one polymerizable unsaturated bond ((meth) acrylonitrile group) of the above (meth)acrylic acid in one molecule and two or more (meth) acrylonitrile groups in the molecule may be used in combination. Functional (meth) acrylate Compound. Specific examples thereof include the following compounds, but the present invention is not limited thereto.

Examples thereof include stretching of 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, and 1,9-nonanediol di(meth)acrylate. Alkane diol di(meth) acrylate having an alkyl chain of 1 to 20 carbon atoms; alkylene chain of polyethylene glycol di(meth) acrylate or polypropylene glycol di(meth) acrylate Polyalkylene glycol di(meth)acrylate having a carbon number of 1 to 20; trimethylolpropane tri(meth)acrylate, ethylene oxide addition trimethylolpropane tri(meth)acrylate Etc. tris(meth)acrylate having a total carbon number of 10 to 60; ethylene oxide addition pentaerythritol tetra(meth)acrylate, di-trimethylolpropane tetra(meth)acrylate, pentaerythritol IV A (meth) acrylate having a total carbon number of 10 to 100 such as (meth) acrylate or dipentaerythritol hexa (meth) acrylate.

The amount of the polyfunctional (meth) acrylate compound such as a bifunctional or trifunctional group is 5 parts by mass based on 100 parts by mass of the total amount of the polymerizable compound contained in the polymerizable composition. The above is preferably from 95 parts by mass or less from the viewpoint of suppressing gelation of the composition. In addition, from the same viewpoint, the amount of the monofunctional (meth) acrylate compound used is 5 parts by mass or more and 95 parts by mass or less based on 100 parts by mass of the total amount of the polymerizable compound contained in the polymerizable composition. good.

As a preferable polymerizable compound, a compound having a cyclic group such as a ring-opening polymerizable cyclic ether group such as an epoxy group or an oxetanyl group can be mentioned. As the compound as described above, a compound having a compound (epoxy compound) having an epoxy group is preferred.

The epoxy compound may, for example, be an aliphatic cyclic epoxy compound, bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether or brominated bisphenol A Glycidyl ether, brominated bisphenol F diglycidyl ether, brominated bisphenol S diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, hydrogenated bisphenol F diglycidyl ether, hydrogenated bisphenol S diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerol triglycidyl ether, trimethylolpropane triglycidyl ether Polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether; use of ethylene glycol, propylene glycol, glycerin, etc., in the addition of one or more alkylene oxides to aliphatic polyvalent alcohols Polyepoxyethers of polyether polyols obtained; diglycidyl esters of aliphatic long-chain dibasic acids; mono-glycidyl ethers of aliphatic higher alcohols; phenol, cresol, butanol or Monoglycidyl ethers of polyether alcohols obtained by addition of alkylene oxides; glycidyl esters of higher fatty acids.

Further, examples of the epoxy compound include polyglycidyl esters of polybasic acids, polyglycidyl ethers of polyvalent alcohols, polyglycidyl ethers of polyoxyalkylene glycols, and polycondensation of aromatic polyhydric alcohols. A hydrogenated compound of a polyglycidyl ether of a glycidyl ether or an aromatic polyol, an urethane polyepoxy compound, and an epoxidized polybutadiene.

Among these components, aliphatic cyclic epoxy compounds, bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, hydrogenated bisphenol F diepoxypropyl Ether, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerol triepoxypropyl ether, trimethylolpropane triglycidyl ether, neopentyl glycol Diglycidyl ether, polyethylene glycol diglycidyl ether, and polypropylene glycol diglycidyl ether are preferred.

Commercially available products which can be suitably used as a compound containing a glycidyl group include UVR-6216 (manufactured by U.S. Union Carbide Co., Ltd.), glycidol, AOEX24, Cyclomer A200, and the like (DAICEL Chemical Industry Co., Ltd.) )), EPIKOTE 828, EPIKOTE 812, EPIKOTE 1031, EPIKOTE 872, EPIKOTE CT508 (above, Yuka Shell Epoxy), KRM-2400, KRM-2410, KRM-2408, KRM-2490, KRM-2720, KRM-2750 (above is the Asahi Chemical Industry Co., Ltd.). These may be used alone or in combination of two or more.

Moreover, these epoxy compounds are produced by any method. For example, Maruzen KK Publishing, Fourth Edition Experimental Chemistry Lecture 20 Organic Synthesis II, 213~, Heisei 4, Ed.by Alfred Hasfner, The chemistry of heterocyclic compounds-Small Ring Heterocycles part3 Oxiranes, John & Wiley and Sons, An Interscience Publication, New York, 1985, Yoshimura, Next, 29, 12, 32, 1985, Yoshimura, Next, 30, 5, 42, 1986, Yoshimura, then, 30, 7, 7, 1986, Japan Documents such as Kaiping No. 11-100378, Japanese Patent No. 2906245, and Japanese Patent No. 2926262 are incorporated herein by reference.

As the epoxy compound, a commercially available epoxy composition in which two or more kinds of components are prepared in advance may be used in accordance with the conditions of use. These are commercially available as an adhesive or a sealant. Commercial products, for example, are available from ThreeBond, EMI, TISC, and the like. Specifically, OPTOCAST (trade name) 3505, OPTOCAST 3506, OPTOCAST 3553, and A-1771 (trade name) manufactured by TISC Corporation can be exemplified. However, the present invention is not limited to these.

The above polymerizable composition containing quantum dots may contain a polymerization initiator. Specifically, as the polymerization initiator, a known radical polymerization initiator or cationic polymerization initiator may be contained. For the polymerization initiator, for example, paragraphs 0037 of JP-A-2013-043382 and paragraphs 0040 to 0942 of JP-A-2011-159924 can be referred to. The polymerization initiator is preferably 0.1 mol% or more, more preferably 0.5 to 5 mol%, based on the total amount of the polymerizable compound contained in the polymerizable composition. However, there is also a case where an acid generator acts as a polymerization initiator with respect to a polymerizable compound, and therefore use of a polymerization initiator is not essential. The polymerization initiator may be appropriately selected from photopolymerization initiators or thermal polymerization initiators depending on the type of the polymerizable compound. From the viewpoint of the end of the polymerization treatment in a short period of time, the polymerization treatment is preferably carried out by light irradiation. Therefore, from this viewpoint, as the polymerization initiator, a photopolymerization initiator is preferred.

Among the acid generators, there is also a function as a cationic polymerization initiator which can polymerize a starting cationically polymerizable compound. When the acid generator as described above is used, the polymerizable compound contained in the polymerizable composition containing the quantum dots is a cationically polymerizable compound which can initiate a polymerization reaction by releasing a proton acid from the acid generator, and additionally It is not necessary to use a polymerization initiator together. On the other hand, from the viewpoint of further improving the adhesion, the polymerizable compound is preferably a radically polymerizable compound. From this point of view, preferred examples of the polymerizable compound include the monofunctional (meth) acrylate compound and the polyfunctional (meth) acrylate compound described above.

-Other ingredients -

The composition containing a quantum dot can be prepared by using the component described above and, if necessary, a known additive which can be arbitrarily added. For example, a composition containing quantum dots can be prepared by mixing the above components and one or more known additives which are added as needed, simultaneously or sequentially. The amount of the additive used is not particularly limited and can be appropriately set. Further, in order to contain the viscosity of the composition of the quantum dots, etc., a solvent may be added as needed. The type and amount of the solvent to be used in this case are not particularly limited. For example, as the solvent, one type of organic solvent or a mixture of two or more types can be used.

The composition containing the quantum dots may further contain an acid generator that generates a protonic acid by energy application. When an acid generator for protonic acid is generated by energy application (triggering), for example, a protonic acid can be generated by bringing the composition into contact with the surface of the adjacent layer and then imparting energy. As a result of the protonic acid generated from the acid generator as described above to promote the reaction of the organometallic coupling agent, the inventors of the present invention presumed that the adhesion to the adjacent layer was improved.

From the above viewpoints, the composition containing the quantum dots is preferably a protonic acid which does not contain a large amount of a form in which a protonic acid is not used. Specifically, the content of the protonic acid is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and most preferably 0 parts by mass, based on 100 parts by mass of the organic metal coupling agent.

Further, in the method for producing a wavelength converting member of the present invention, the surface of the inorganic layer of the barrier film is previously contained with an organic metal coupling agent and water before the inorganic layer of the barrier film and the wavelength conversion layer containing the quantum dots are laminated. The surface composition of the composition contains the wavelength of the quantum dot Since the adhesion between the conversion layer and the barrier film after the moist heat is very good, the composition containing the quantum dots may not contain a reaction accelerator such as an acid generator. Specifically, the content of the reaction accelerator such as an acid generator is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and most preferably 0 parts by mass, based on 100 parts by mass of the organic metal coupling agent. good.

<rolling step>

In the method for producing a wavelength converting member of the present invention, it is preferable that the step of winding the wavelength converting member to the drum after the stacking step is performed.

Moreover, the method for producing a wavelength conversion member according to the present invention is continuous from the viewpoint of being able to produce a wavelength conversion member having a good wet heat between a wavelength conversion layer containing a quantum dot and a barrier film with high productivity. The rolling method, the surface winding step, the layering step, and the winding step are preferably performed by the rolling method.

[wavelength conversion member]

The first aspect of the wavelength converting member of the present invention is a wavelength converting member manufactured by the method for producing a wavelength converting member of the present invention. A second aspect of the wavelength converting member of the present invention is a wavelength converting member comprising a barrier film having a surface-treated inorganic layer of at least one layer, and a direct connection on a surface treated on the surface of the barrier film In the arrangement of the wavelength conversion layer containing the quantum dots, the surface treatment is applied to the surface of the inorganic layer of the barrier film by a composition for surface treatment containing a solvent containing water and an organic metal coupling agent. Hereinafter, the wavelength conversion member of the present invention will be described in more detail.

From the viewpoint of good adhesion between the wavelength conversion layer containing the quantum dots and the barrier film, the wavelength conversion member of the present invention preferably has at least one surface to the thickness direction of the wavelength conversion layer. The concentration of the organometallic coupling agent in the surface region at a distance of 10% or less is higher than the concentration of the organometallic coupling agent in the inner region at a distance of more than 10% from the surface of the wavelength conversion layer to the thickness direction.

The concentration of the organometallic coupling agent in the surface region of the surface of at least one of the wavelength conversion layers to a distance of 10% or less in the thickness direction is more organic than the internal region of the distance from both surfaces of the wavelength conversion layer to the thickness direction by more than 10%. The concentration of the metal coupling agent is higher and can be measured by the method described in the examples below.

[Backlight unit]

The backlight unit of the present invention includes at least the wavelength conversion member of the present invention and a light source. The details of the wavelength converting member are as previously described.

(Lighting wavelength of backlight unit)

From the viewpoint of realization of high brightness and high color reproducibility, it is preferable to use a multi-wavelength light source as a backlight unit. As a preferred aspect, a blue light having an emission center wavelength in a wavelength band of 430 to 480 nm and having a half-value width of 100 nm or less, and a wavelength band of 500 to 600 nm is provided. a green light having an emission center wavelength and having a half-value width of 100 nm or less, and a red light having an emission center wavelength in a wavelength band of 600 to 680 nm and having a half-value width of 100 nm or less. Backlight unit. From the viewpoint of further improving the brightness and color reproducibility, the wavelength band of the blue light emitted by the backlight unit is preferably in the range of 440 to 480 nm. The range of 440~460nm is better. From the same point of view, the wavelength range of the green light emitted by the backlight unit is preferably in the range of 510 to 560 nm, and the range of 510 to 545 nm is better. Further, from the same viewpoint, the wavelength range of the red light emitted from the backlight unit is preferably in the range of 600 to 650 nm, and the range of 610 to 640 nm is more preferable.

Further, from the same viewpoint, the half value width of each of the blue light, the green light, and the red light emitted from the backlight unit is preferably 80 nm or less, more preferably 50 nm or less, and particularly preferably 40 nm or less, and most preferably 30 nm or less. Among these, the half value width of each of the luminous intensities of the blue light is particularly preferably 25 nm or less.

The backlight unit includes at least the above-described wavelength conversion member and the light source. In one aspect, as the light source, a blue light emitting light having a center wavelength of luminescence in a wavelength band of 430 nm to 480 nm, for example, a blue light emitting diode emitting blue light can be used. When a light source that emits blue light is used, it is preferable that at least the quantum dot A that emits red light by excitation light and the quantum dot B that emits green light are included in the wavelength conversion layer. According to the foregoing, white light can be emitted by emitting blue light transmitted through the wavelength conversion member from the light source and red light and green light emitted from the wavelength conversion member.

Alternatively, in other aspects, as the light source, an ultraviolet light emitting source having an emission center wavelength in a wavelength band of 300 nm to 430 nm, for example, an ultraviolet light emitting diode may be used. In this case, it is preferable that the wavelength conversion layer includes quantum dots A and B and quantum dots C which are excited by excitation light to emit blue light. According to the foregoing, white light can be exhibited by the red light, the green light, and the blue light emitted from the wavelength converting member. Moreover, in other aspects, by using a light source selected from the group consisting of emitting blue light Two kinds of light sources in a group of blue lasers, green lasers emitting green light, and red lasers emitting red light, so that quantum dots emitting fluorescence having a different wavelength of light emitted from the light emitted by the light source exist In the wavelength conversion layer, white light can be emitted by the two kinds of light emitted from the light source and the light emitted from the quantum dots of the wavelength conversion layer.

Moreover, in other aspects, the light-emitting diode can be replaced by a laser light source.

In the backlight unit of the present invention, the light source has a light-emitting center wavelength in a wavelength band of 430 nm to 480 nm.

(constitution of backlight unit)

The configuration of the backlight unit may be an edge illumination method in which a light guide plate, a reflection plate, or the like is used as a constituent member, or may be a direct type. In Fig. 1, an example of a backlight unit of an edge illumination method is shown as an aspect. As the light guide plate, there is no limitation, and a known one can be used.

Further, the backlight unit may be provided with a reflection member at a rear portion of the light source. The reflection member as described above is not particularly limited, and a known one can be used, and is disclosed in Japanese Patent No. 3,416,302, Japanese Patent No. 3,363,565, Japanese Patent No. 4,091,978, Japanese Patent No. 3,448,626, and the like. .

The backlight unit is preferably provided with a known diffusion plate, a diffusion sheet, a ruthenium sheet (for example, a BEF series manufactured by Sumitomo 3M Co., Ltd.), and a light guide. The other components are described in Japanese Patent No. 3,416,302, Japanese Patent No. 3,363,565, Japanese Patent No. 4,091,978, and Japanese Patent No. 3,448,626, the contents of each of which are incorporated herein.

[Liquid Crystal Display Device]

The liquid crystal display device of the present invention includes at least the backlight unit and the liquid crystal cell of the present invention.

(Composition of liquid crystal display device)

The driving mode of the liquid crystal cell is not particularly limited, and various modes such as twisted nematic (TN), super twisted nematic (STN), vertical alignment (VA), lateral electric field effect (IPS), and optical compensation bending (OCB) can be utilized. . The liquid crystal cell is preferably a VA mode, an OCB mode, an IPS mode, or a TN mode, but is not limited thereto. The configuration of the liquid crystal display device of the VA mode is exemplified by the configuration shown in FIG. 2 of JP-A-2008-262161. However, the specific configuration of the liquid crystal display device is not particularly limited, and a known configuration can be employed.

In one embodiment of the liquid crystal display device, a liquid crystal cell having a liquid crystal layer interposed between the substrates on which at least one of the electrodes is provided is provided, and the liquid crystal cell is disposed between the two polarizing plates. The liquid crystal display device includes a liquid crystal cell in which liquid crystal is sealed between the upper and lower substrates, and the image is displayed by changing the alignment state of the liquid crystal by voltage application. Further, an optical compensation member for optically polarizing the protective film or optical compensation, and an additional functional layer such as an adhesive layer may be provided as needed. Further, a color filter substrate, a thin-film transistor substrate, a lens film, a diffusion sheet, a hard coat layer, an anti-reflection layer, a low-reflection layer, an anti-glare layer, and the like, and a front scattering layer may be disposed at the same time (or instead). a surface layer of a primer layer, an antistatic layer, an undercoat layer, or the like.

Fig. 2 shows an example of a liquid crystal display device according to an aspect of the present invention. The liquid crystal display device 51 shown in FIG. 2 is attached to a liquid crystal single The surface on the backlight side of the element 21 has a backlight-side polarizing plate 14. The backlight-side polarizing plate 14 may include the polarizing plate protective film 11 on the backlight side of the backlight-side polarizer 12, or may not be included, but is preferably included.

The backlight-side polarizing plate 14 is preferably configured such that the polarizing plate 12 is sandwiched between two polarizing plate protective films 11 and 13.

In the present specification, the polarizing plate protective film near the liquid crystal cell side with respect to the polarizer is referred to as an inner polarizing plate protective film, and the polarizing plate protective film farther from the liquid crystal cell with respect to the polarizing plate is referred to as an outer polarizing plate protection. film. In the example shown in FIG. 2, the polarizing plate protective film 13 is an inner polarizing plate protective film, and the polarizing plate protective film 11 is an outer polarizing plate protective film.

The backlight-side polarizing plate may have a retardation film as an inner polarizing plate protective film on the liquid crystal cell side. As the retardation film as described above, a known deuterated cellulose film or the like can be used.

The liquid crystal display device 51 has a display-side polarizing plate 44 on a surface opposite to the surface on the backlight side of the liquid crystal cell 21. The display side polarizing plate 44 has a configuration in which the polarizing plate 42 is sandwiched by two polarizing plate protective films 41 and 43. The polarizing plate protective film 43 is an inner polarizing plate protective film, and the polarizing plate protective film 41 is an outer polarizing plate protective film.

The backlight unit 1 included in the liquid crystal display device 51 is as described above.

The liquid crystal cell, the polarizing plate, the polarizing plate protective film, and the like of the liquid crystal display device according to an aspect of the present invention are not particularly limited, and a manufacturer or a commercially available product can be used without any limitation. Further, of course, a well-known intermediate layer such as an adhesive layer may be provided between the respective layers.

[Examples]

Hereinafter, the present invention will be further specifically described based on examples. The materials, the amounts used, the ratios, the contents of the treatment, the order of treatment, and the like, which are shown in the following examples, may be appropriately changed as long as they do not deviate from the gist of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.

[Example 1]

1. Production of barrier film 10

The organic layer and the inorganic layer were placed in the following order on one side of a polyethylene terephthalate film (PET film, manufactured by Toyobo Co., Ltd., trade name: COSMOSHINE (registered trademark) A4300, thickness: 50 μm, width: 1000 mm, length: 100 m). The layers are formed in sequence.

Prepare trimethylolpropane triacrylate (TMPTA manufactured by DAICEL CYTEC Co., Ltd.) and photopolymerization initiator (ESACURE KTO46, manufactured by Lamberti Co., Ltd.) as a mass ratio, and weigh the former: the latter = 95:5, and we will It was dissolved in methyl ethyl ketone as a coating liquid having a solid concentration of 15%. This coating liquid was applied onto the PET film by a continuous rolling method using a die coater, and passed through a drying zone at 50 ° C for 3 minutes. Thereafter, the ultraviolet rays were irradiated under a nitrogen atmosphere (the cumulative irradiation amount was about 600 mJ/cm ² ), and the fibers were hardened by ultraviolet curing to be wound up. The thickness of the first organic layer formed on the support was 1 μm.

Next, an inorganic layer (tantalum nitride layer) was formed on the surface of the first organic layer using a CVD ( Chemical Vapor Deposition ) apparatus of a continuous rolling method. As the material gas, decane gas (flow rate: 160 sccm), ammonia gas (flow rate: 370 sccm), hydrogen gas (flow rate: 590 sccm), and nitrogen gas (flow rate: 240 sccm) were used. As a power source, a high frequency power supply with a frequency of 13.56 MHz is used. The film formation pressure was 40 Pa, and the film thickness was 50 nm. As described above, two sheets of the barrier film 10 in which an inorganic layer was laminated on the surface of the first organic layer were produced.

The contact angle of the surface of the inorganic layer of the barrier film 10 obtained with water was 50 degrees. It was confirmed that the oxygen permeability of the barrier film 10 was 0.01 cm ³ /(m ² .day.atm) or less, and the total light transmittance in the visible light region was 90% or more.

2. Surface treatment using organic metal coupling agents

A solution of the following composition was prepared as a composition for surface treatment (coating liquid for surface treatment).

IPA/ethanol/acetic acid/water/KBM-5103 (manufactured by Shin-Etsu Chemical Co., Ltd.) = 14/14/2/20/50% by mass, pH=4.5.

IPA is an abbreviation for isopropyl alcohol, and KBM-5103 is a solution containing one decane coupling agent as an organic metal coupling agent.

The surface treatment composition (coating liquid for surface treatment) was applied by a roll coater at a coating amount of ² cc/m ² on the inorganic layer of the barrier film by a continuous coater, and passed through a drying zone at 120 ° C. 3 minutes.

3. Lamination (production of wavelength conversion layer)

As a polymerizable composition containing quantum dots, the following quantum dot dispersion 1 was prepared, filtered through a polypropylene filter having a pore size of 0.2 μm, and then dried under reduced pressure for 30 minutes to be used as a coating liquid. The concentration of quantum dots in the following toluene dispersion was 1% by mass.

As the quantum dots 1 and 2, a nanocrystal having the following core-shell structure (InP/ZnS) was used.

Quantum dot 1: INP530-10 (manufactured by NN-labs)

Quantum Dot 2: INP620-10 (manufactured by NN-labs)

The viscosity of quantum dot dispersion 1 is 50mPa. s.

Decane coupling agent KBM-5103

The barrier film 10 produced in the above procedure is used as the first and second films, and the wavelength conversion member 1 is obtained by the manufacturing steps described with reference to FIGS. 3 and 4 . Specifically, as the first film, the first film of the barrier film 10 is continuously conveyed at a tension of 1 m/min and 60 N/m, and a coating liquid containing a composition of quantum dots is applied to the first film from a die coater. The surface of the film was formed into a coating film having a thickness of 50 μm. Next, the first film on which the coating film is formed is wound around a roller, and a second film of the second film of the barrier film 10 of another second film is laminated on the coating film. In a state where the coating film is sandwiched between the first film and the second film, the film is wound around the idler roller and irradiated with ultraviolet rays while being continuously conveyed. The diameter of the roller is 300mm, the temperature of the roller is 50 °C. The amount of ultraviolet rays irradiated was 2000 mJ/cm ² . Further, L1 is 50 mm, L2 is 1 mm, and L3 is 50 mm.

The coating film is cured by irradiation with ultraviolet rays to form a wavelength conversion layer (hardened layer), and the wavelength conversion member 1 as the obtained laminate is taken up by another collection drum to be produced. The thickness of the hardened layer of the wavelength converting member is about 50 μm. In this manner, the wavelength conversion member of Embodiment 1 in which the barrier film 10 is separately provided on both surfaces of the wavelength conversion layer and the two main surfaces of the wavelength conversion layer are directly connected to the inorganic layer treated by the surface of the barrier film 10 is obtained. 1.

[Embodiment 2]

In the first embodiment, the wavelength conversion member 2 of Example 2 was produced in the same manner as in Example 1 except that the composition for surface treatment (coating liquid for surface treatment) was changed to the following composition.

IPA/ethanol/acetic acid/water/KBM-5103 (manufactured by Shin-Etsu Chemical Co., Ltd.)/F-444 (manufactured by DIC Corporation) = 14/14/2/20/50/0.1% by mass, pH=4.6.

In the following Table 2, F-444 which is a fluorine-based nonionic surfactant produced by DIC Corporation is described as a surfactant A.

[Example 3]

In the first embodiment, the wavelength conversion member 3 of Example 3 was produced in the same manner as in Example 1 except that the composition for surface treatment (coating liquid for surface treatment) was changed to the following composition.

IPA/ethanol/acetic acid/water/KBM-5103 (manufactured by Shin-Etsu Chemical Co., Ltd.)/F-114 (manufactured by DIC Corporation) = 14/14/2/20/50/0.1% by mass, pH=4.4.

In the following Table 2, F-114 which is a fluorine-based anionic surfactant produced by DIC Corporation is described as a surfactant B.

[Example 4]

In the first embodiment, the wavelength conversion member 4 of Example 4 was produced in the same manner as in Example 1 except that the composition for surface treatment (coating liquid for surface treatment) was changed to the following composition.

IPA/ethanol/acetic acid/water/KBM-5103 (Shin-Etsu Chemical Co., Ltd.)/NEOPELEX G-15 (made by Kao Co., Ltd.) = 14/14/2/20/50/0.6% by mass, pH=4.5 .

In the following Table 2, NEOPELEX G-15 (manufactured by Kao Co., Ltd.), which is a sodium dodecylbenzenesulfonate surfactant, and a solid concentration of 16% are described as a surfactant C.

[Example 5]

In the first embodiment, the wavelength conversion member 5 of the fifth embodiment was produced in the same manner as in the first embodiment except that the composition for the surface treatment (coating liquid for surface treatment) was changed to the following composition.

IPA/ethanol/acetic acid/water/KBM-5103 (manufactured by Shin-Etsu Chemical Co., Ltd.)/EMULGEN 106 (manufactured by Kao Corporation) = 14/14/2/20/50/0.1% by mass, pH=4.7.

In the following Table 2, EMULGEN 106 (manufactured by Kao Corporation), which is a polyoxyethylene lauryl ether surfactant, is described as a surfactant D.

[Embodiment 6]

In the first embodiment, the wavelength conversion member 6 of Example 6 was produced in the same manner as in Example 1 except that the composition for surface treatment (coating liquid for surface treatment) was changed to the following composition.

IPA/ethanol/acetic acid/water/KBM-5103 (manufactured by Shin-Etsu Chemical Co., Ltd.)/QUARTAMIN 24P (manufactured by Kao Corporation) = 14/14/2/20/50/0.1% by mass, pH=4.4.

In the following Table 2, QUARTAMIN 24P (manufactured by Kao Corporation), which is a lauryl trimethylbenzylammonium chloride surfactant, is described as a surfactant E.

[Embodiment 7]

In the first embodiment, KBM-5103 in the composition for surface treatment (coating liquid for surface treatment) was changed to KBM-603 (manufactured by Shin-Etsu Chemical Co., Ltd.) as a decane coupling agent, and The wavelength conversion member 7 of Example 7 was produced in the same manner as in Example 1.

[Embodiment 8]

In the first embodiment, the wavelength conversion member 8 was produced in the same manner as in the first embodiment except that the inorganic layer of the barrier film was changed to the following.

The film forming the organic layer was mounted on a hollow cathode type ion plating apparatus. Then, cerium oxide (manufactured by High Purity Chemical Research Laboratory), which is an evaporation source material, was introduced into a hollow cathode type ion plating apparatus, and vacuum drawing was performed. After the degree of vacuum reached 5 × 10 ^-4 Pa, argon gas was introduced into the plasma gun at 15 sccm to generate a plasma having a current of 110 A and a voltage of 90 V. When the chamber is maintained at 1 × 10 ^-1 Pa, the plasma is bent in a predetermined direction by a magnetic force to irradiate the evaporation source material. The evaporation source material is sublimated via a molten state. The ion plating was carried out for 10 seconds, and deposited on the film to form an inorganic layer containing cerium oxide having a film thickness of 50 nm. The inorganic layer of the barrier film obtained had a contact angle with water of 25 degrees. It was confirmed that the barrier film had an oxygen permeability of 0.01 cm ³ /(m ² .day.atm) or less, and the total light transmittance in the visible light region was 90% or more.

[Comparative Example 1]

In the first embodiment, the wavelength conversion member T of Comparative Example 1 was produced in the same manner as in Example 1 except that the coating for the surface treatment was not applied.

[Comparative Example 2]

In the first embodiment, the composition for surface treatment of Example 1 was changed to a composition for surface treatment containing no water, and IPA/ethanol/KBM-5103=25/25/50% by mass. The wavelength conversion member of Comparative Example 2 was produced in the same manner as in Example 1. Further, KBM-5103, which is a solution containing a decane coupling agent, does not contain water.

[Reference Example 1]

In the first embodiment, after the barrier film 10 was produced, the surface treatment was not carried out, and the following quantum dot dispersion 2 was used as the polymerizable composition containing quantum dots, and the same procedure as in Example 1 was carried out. The wavelength conversion member of Reference Example 1. The details of the quantum dot dispersion 2 are shown below.

As a polymerizable composition containing quantum dots, the following quantum dot dispersion 2 was prepared, filtered through a polypropylene filter having a pore size of 0.2 μm, and then dried under reduced pressure for 30 minutes to be used as a coating liquid. The concentration of quantum dots in the following toluene dispersion was 1% by mass.

As the quantum dots 1 and 2, a nanocrystal having the following core-shell structure (InP/ZnS) was used.

Quantum dot 1: INP530-10 (manufactured by NN-labs)

Quantum Dot 2: INP620-10 (manufactured by NN-labs)

The viscosity of quantum dot dispersion 2 is 50mPa. s.

[Evaluation]

<Method of evaluating surface wettability>

When the surface treatment composition is applied/dried to the surface of the inorganic layer of the barrier film, if the surface treatment composition can be applied to the surface of the inorganic layer, it is judged as A, and a part of the water repellent is B. , full water can not be coated as C.

The results are shown in Table 2 below.

If A or B is evaluated, there is no problem in practical use. A evaluation is preferred.

<Evaluation of adhesion>

A sample in which the produced wavelength conversion member was stored under high temperature and high humidity conditions of a temperature of 70 ° C and a relative humidity of 75% for 5 days was prepared, and the sample was evaluated in accordance with the method according to JIS K5400. On one side of the layer (barrier film) other than the wavelength conversion layer of the wavelength conversion member of each of the examples, the comparative examples and the reference examples, the wavelength conversion layer of 90° was cut at intervals of 1 mm with respect to the film surface by the cutting blade. For the mark, 100 pieces of a test piece of 1 mm square shape were produced. The tape attached to the Mara tape (Nitto Denko, polyester tape, No. 31B) having a width of 2 cm was peeled off. The number of test pieces in which the layer remained on the outermost surface of the wavelength conversion member of each of the examples, the comparative examples, and the reference examples was evaluated. The same test was carried out on both sides, and the value of the surface of the test piece having the smallest layer remaining on the surface was used, and the evaluation was performed based on the following evaluation criteria. The results are shown in Table 2 below.

(evaluation benchmark)

A: 100 residual test pieces

B: The number of residual test pieces is 99~80

C: The number of residual test pieces is 79~60

D: 59~20 residual test pieces

E: The number of residual test pieces is 19~0

If A, B or C is evaluated, there is no problem in practical use. A or B evaluation is better, and A evaluation is better.

According to the above-mentioned Table 2, it is understood that the wavelength conversion member of each of the examples has good adhesion after the wet heat between the wavelength conversion layer containing the quantum dots and the barrier film.

According to Comparative Example 1, it is understood that the wavelength conversion member produced by using the barrier film which is not subjected to the surface treatment is inferior in adhesion between the wavelength conversion layer containing the quantum dots and the barrier film.

According to the second comparative example, it is understood that the wavelength conversion member manufactured using the composition for surface treatment containing no water is inferior in adhesion between the wavelength conversion layer containing the quantum dots and the barrier film.

<Evaluation of non-uniform presence of organometallic coupling agents>

Further, for the wavelength conversion members of the respective examples, comparative examples, and reference examples, the non-uniform presence of the organic metal coupling agent of the wavelength conversion layer was evaluated.

Specifically, with respect to the wavelength conversion member of each of the examples, the concentration of the organometallic coupling agent in the surface region of the surface of at least one of the wavelength conversion layers to a distance of 10% or less in the thickness direction is confirmed by the following method. The concentration of the organometallic coupling agent in the inner region of the surface of both of the conversion layers to a distance exceeding 10% in the thickness direction is higher.

The cross section was analyzed by X-ray photoelectron spectroscopy (XPS) by cutting a thin film of the wavelength conversion member produced, and the distribution of the coupling agent was confirmed.

On the other hand, in the wavelength conversion members of Comparative Example 1 and the reference example, the non-uniform presence of the organic metal coupling agent of the wavelength conversion layer could not be measured by the above method.

[Examples 101 to 108, Comparative Examples 101 and 102, and Reference Example 101]

<Manufacture of backlight unit and liquid crystal display device>

The commercially available tablet terminal (Kindle (registered trademark) Fire HDX 7 manufactured by Amazon Inc.) is decomposed, and the backlight unit is taken out. The wavelengths of the respective embodiments, comparative examples, and reference examples which are cut into rectangles are placed on the light guide plate of the removed backlight unit. The conversion member was formed, and the backlight unit and the liquid crystal display device of Examples 101 to 108, Comparative Examples 101 and 102, and Reference Example 101 were produced by superimposing two sheets of tantalum sheets having orthogonal surface relief patterns thereon.

It is understood that the wavelength conversion member of each of the examples has less edge peeling when cut into a rectangular shape than the wavelength conversion member of the comparative example.

Further, the liquid crystal display device of each of the embodiments exhibited good display performance.

[Industrial use]

The present invention is useful in the field of manufacturing liquid crystal display devices.

Claims (15)

A method for producing a wavelength conversion member, comprising: a surface treatment step of surface-treating a barrier film having at least one inorganic layer; and a laminating step of laminating a surface of the surface treated with the barrier film a wavelength conversion layer of a quantum dot; the surface treatment step is a step of imparting a composition for surface treatment comprising a solvent containing water and an organic metal coupling agent to the surface of the inorganic layer of the barrier film. A method of producing a wavelength converting member according to claim 1, wherein the organometallic coupling agent has a reactive functional group at the terminal. A method of producing a wavelength converting member according to claim 1, wherein the composition for surface treatment contains a surfactant. A method of producing a wavelength converting member according to claim 3, wherein the surfactant is a fluorine-based nonionic surfactant. The method for producing a wavelength conversion member according to claim 1, wherein the solvent for the composition for surface treatment contains an organic solvent. The method for producing a wavelength conversion member according to claim 1, wherein the surface treatment step is to surface-treat the first barrier film having at least one inorganic layer and the second barrier film having at least one inorganic layer. In the step, the laminating step is a step of sandwiching the wavelength conversion layer with a surface treated by each of the first barrier film and the second barrier film. The method for manufacturing a wavelength conversion member according to claim 6, comprising the steps of: winding the first barrier film and the second barrier film separately from the roller before the surface treatment step; and in the laminating After the step, the wavelength converting member is wound up on the drum; the winding-out step, the surface treatment step, the laminating step, and the winding step are performed in a roll-to-roll manner. A method of producing a wavelength conversion member according to claim 1, wherein the step of laminating is a coating step of a composition containing quantum dots. A wavelength conversion member manufactured by the method of manufacturing a wavelength conversion member according to any one of claims 1 to 8. The wavelength conversion member according to claim 9, wherein the concentration of the organometallic coupling agent in the surface region of the surface of at least one of the wavelength conversion layers to a distance of 10% or less in the thickness direction is higher than the surface of both of the wavelength conversion layers The concentration of the organometallic coupling agent in the inner region of the distance exceeding 10% in the thickness direction is higher. A wavelength conversion member comprising a barrier film having at least one inorganic layer formed by surface treatment, and a wavelength conversion layer containing quantum dots directly connected to a surface treated on the surface of the barrier film, The surface treatment is to apply a composition for surface treatment containing a solvent containing water and an organic metal coupling agent to the surface of the inorganic layer of the barrier film. The wavelength conversion member according to claim 11, wherein the concentration of the organometallic coupling agent in the surface region of the surface of at least one of the wavelength conversion layers to a distance of 10% or less in the thickness direction is higher than the surface of both of the wavelength conversion layers The concentration of the organometallic coupling agent in the inner region of the distance exceeding 10% in the thickness direction is higher. A backlight unit comprising at least the wavelength conversion member and the light source according to any one of claims 9 to 12. The backlight unit of claim 13, wherein the light source has an emission center wavelength in a wavelength band of 430 nm to 480 nm. A liquid crystal display device comprising at least a backlight unit and a liquid crystal cell as claimed in claim 13 or 14.