KR102022398B1

KR102022398B1 - Color conversion film and method for preparing the same and back light unit comprising the same

Info

Publication number: KR102022398B1
Application number: KR1020160014882A
Authority: KR
Inventors: 신동목; 안병인; 김상섭; 김나리; 박세정; 박태성; 김지호; 오혜미; 서주연
Original assignee: 주식회사 엘지화학
Priority date: 2015-02-06
Filing date: 2016-02-05
Publication date: 2019-09-18
Also published as: KR20160097153A

Abstract

The invention described herein includes a resin matrix; And an organic phosphor dispersed in the resin matrix and including an organic phosphor that absorbs blue or green light and emits light having a wavelength different from that of the absorbed light. An adhesive or adhesive layer provided on at least one surface of the color conversion layer; And a light conversion pattern layer attached to an opposite surface of the adhesive or adhesive layer opposite to the color conversion layer, a manufacturing method thereof, and a backlight unit including the same.

Description

COLOR CONVERSION FILM AND METHOD FOR PREPARING THE SAME AND BACK LIGHT UNIT COMPRISING THE SAME}

The present application relates to a color conversion film, a method for manufacturing the same, and a backlight unit including the color conversion film.

Along with the large area of TV, high definition, slimming, and high functionalization have been achieved. High-performance, high-definition OLED TVs still suffer from price competitiveness, and thus, the full-fledged market is not yet open. Therefore, efforts are being made to secure the advantages of OLEDs similarly with LCDs.

As one of the efforts, a lot of technologies and prototypes related to quantum dots have been recently implemented. However, since cadmium-based quantum dots have safety problems, such as restriction on use, attention has been focused on backlight production using cadmium-free quantum dots having relatively no safety issues.

The present application provides a color conversion film, a method for manufacturing the same, and a backlight unit including the color conversion film.

One embodiment of the present application

Resin matrix; And an organic phosphor dispersed in the resin matrix and including an organic phosphor that absorbs blue or green light and emits light having a wavelength different from that of the absorbed light.

An adhesive or adhesive layer provided on at least one surface of the color conversion layer; And

It provides a color conversion film comprising a light collecting pattern layer attached to the opposite side of the surface facing the color conversion layer of the adhesive or adhesive layer.

Another embodiment of the present application

Resin matrix; And an organic phosphor dispersed in the resin matrix and including an organic phosphor that absorbs blue or green light and emits light having a wavelength different from that of the absorbed light. And

Laminating an adhesive or adhesive layer and a light collecting pattern layer simultaneously or sequentially on at least one surface of the color conversion layer; Or laminating an adhesive or adhesive layer and a transparent substrate on at least one surface of the color conversion layer simultaneously or sequentially, and then forming a light collecting pattern on the transparent substrate.

It provides a method for producing a color conversion film comprising a.

Another embodiment of the present application provides a backlight unit including the color conversion film.

According to the exemplary embodiments described herein, the color conversion film is a light collecting pattern layer directly attached to at least one surface of the color conversion layer through an adhesive or adhesive layer, and has a light collecting pattern integrated structure. Therefore, there is an advantage in that the number of processes is relatively reduced and the manufacturing cost is reduced compared to the case of having a light collecting sheet separate from the conventional color conversion film.

1 illustrates a laminated structure of a color conversion film according to an exemplary embodiment of the present application.
Figure 2 illustrates an exploded view of the backlight unit according to the prior art.
3 illustrates a process of forming a light collecting pattern on a color conversion film according to an exemplary embodiment of the present application.
Figure 4 compares the brightness characteristics of the films prepared in Example 1 and Comparative Example 1.
5 illustrates a backlight structure for measuring the experimental result of FIG. 4.
Figure 6 compares the luminance characteristics of the films prepared in Examples 2, 3 and Comparative Example 2.

Color conversion film according to an embodiment of the present application is a resin matrix; And an organic phosphor dispersed in the resin matrix and including an organic phosphor that absorbs blue or green light and emits light having a wavelength different from that of the absorbed light. An adhesive or adhesive layer provided on at least one surface of the color conversion layer; And a light collecting pattern layer attached to a surface opposite to a surface of the adhesive or adhesive layer that faces the color conversion layer.

1 illustrates a laminated structure of a color conversion film according to an exemplary embodiment of the present application. According to FIG. 1, the light collecting pattern layer includes a transparent substrate and a light collecting pattern provided on the transparent substrate, but is not limited thereto. It may be an integral structure in which one surface of the transparent substrate is modified to form a light collecting pattern. The transparent substrate may be replaced with a barrier film.

The light collecting pattern included in the light collecting pattern layer is not particularly limited as long as it is a structure capable of collecting light. For example, the light collecting pattern may include a prism of a triangular cross section, a pyramid prism, a square pyramid, a triangular prism, and a curved lens; Or circular or elliptical lenticular lenses formed regularly or irregularly.

2 is an exploded view of a backlight unit according to the prior art. Generally, two prism sheets are arrange | positioned at the one surface side of a color conversion film. A light collecting sheet, such as a prism sheet, collects light emitted from a color conversion film to improve brightness of the backlight, and serves to reduce luminance variation according to a viewing angle.

Typical prism sheets include a transparent substrate such as a PET film and a prism structure provided thereon. On the other hand, the color conversion film is provided on a transparent substrate, the transparent substrate, a color conversion layer comprising a resin matrix and an organic phosphor, and a protective film or barrier film attached to the color conversion layer using an adhesive layer is provided. .

However, in the present invention, instead of the protective film or the barrier film, a light collecting pattern layer such as a prism sheet is attached to the color conversion layer by using an adhesive or adhesive layer. Therefore, according to the present invention, the light collecting pattern layer may play a role of a protective film or a barrier film and at the same time a light collecting sheet depending on the material. Accordingly, by implementing the functions of the two films through one film, it is possible to implement a reduction in the number of processes with the convenience of the manufacturing process.

In addition, when the color conversion film and the light collecting sheet are laminated separately as in the prior art, the cover film of the color conversion film and the transparent substrate of the light collecting sheet are overlapped and applied, whereas according to the present invention, one film is a cover film of the color conversion film. And by acting as a transparent substrate of the light collecting sheet can reduce the thickness of the backlight unit.

In the present specification, the material and thickness of the adhesive or adhesive layer may be selected from techniques known in the art. It is most preferable to use a non-carrier-type acrylic adhesive film, but in some cases, a carrier type may be used. It is also possible to apply an epoxy cured adhesive. The thickness of the adhesive or adhesive layer is most preferably around 25 μm to 100 μm.

According to another exemplary embodiment of the present application, the color conversion film further includes a protective film or a barrier film on at least one surface. According to this exemplary embodiment, an adhesive layer or an adhesive layer may be used to attach a protective film or a barrier film as necessary. As the protective film and the barrier film, those known in the art may be used.

In the present specification, the organic phosphor may emit light when irradiated with light having a light emission peak at 450 nm, a half width of 40 nm or less, and a monomodal emission intensity distribution. Here, the light emitted may be green light having a wavelength selected from a wavelength of 500 nm to 560 nm, or red light having a wavelength selected from a wavelength of 600 nm to 780 nm, or a mixture thereof.

According to an exemplary embodiment of the present application, the organic phosphor may include an organic phosphor that absorbs blue or green light to emit red light, an organic phosphor that absorbs blue light to emit green light, or a mixture thereof. .

In the present specification, blue light, green light and red light may be used as definitions known in the art, for example, blue light is light having a wavelength selected from a wavelength of 400 nm to 500 nm, and green light is 500 light having a wavelength selected from the wavelength of nm to 560 nm, and red light is light having a wavelength selected from the wavelength of 600 nm to 780 nm. In the present specification, the green phosphor absorbs at least a portion of blue light to emit green light, and the red phosphor absorbs at least a portion of blue light or green light to emit red light. For example, the red phosphor may absorb not only blue light but also light having a wavelength between 500 and 600 nm.

According to an exemplary embodiment, the color conversion film has a half width of a light emission wavelength of 60 nm or less upon light irradiation. The full width at half maximum means a width of an emission peak when the maximum emission peak is half the maximum height of light emitted from the film. The full width at half maximum of the luminescence peak herein can be measured in the film state. The light irradiated onto the film when the half width is formed may be light having a light emission peak at 450 nm, a half width of 40 nm or less, and a monomodal light emission intensity distribution. The full width at half maximum of the emission peak may be determined by the type or composition of components such as an organic phosphor, a resin matrix, or other additives included in the color conversion film. The smaller the half width of the emission peak of the color conversion film is, the more advantageous it is for color reproduction.

According to an exemplary embodiment of the present application, an organic phosphor including a pyrromethene metal complex structure may be used as the organic phosphor.

According to one example, an organic phosphor of formula 1 may be used as the organic phosphor.

[Formula 1]

In Chemical Formula 1,

X ₁ and X ₂ are a fluorine group or an alkoxy group,

R ₁ to R ₄ are the same as or different from each other, and each independently hydrogen, a halogen group, an alkyl group, an alkoxy group, a carboxyl substituted alkyl group, an aryl group unsubstituted or substituted with an alkoxy group, -COOR or -COOR substituted alkyl group, wherein R Is an alkyl group,

R ₅ and R ₆ are the same as or different from each other, and are each independently an aryl group unsubstituted or substituted with hydrogen, cyano group, nitro group, alkyl group, carboxyl substituted alkyl group, -SO ₃ Na, or arylalkynyl, and R ₁ And R ₅ may be linked to each other to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocycle, and R ₄ and R ₆ may be linked to each other to be substituted or unsubstituted hydrocarbon ring or substituted or unsubstituted Can form heterocycles,

R ₇ is hydrogen; An alkyl group; Haloalkyl group; Or an aryl group unsubstituted or substituted with a halogen group, an alkyl group, an alkoxy group, an aryl group or an alkylaryl group.

According to an exemplary embodiment, R ₁ to R ₄ in Formula 1 are the same as or different from each other, and each independently hydrogen, a fluorine group, a chlorine group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, and a carboxyl group. An alkyl group having 1 to 6 carbon atoms substituted with an acid, an aryl group having 6 to 20 carbon atoms substituted or unsubstituted with an alkoxy group having 1 to 6 carbon atoms, -COOR, or an alkyl group having 1 to 6 carbon atoms substituted with -COOR, wherein R is 1 to 6 carbon atoms 6 is an alkyl group.

According to another exemplary embodiment, R ₁ to R ₄ of the general formula (1) are the same as or different from each other, and each independently hydrogen, chlorine group, methyl group, carboxyl group substituted ethyl group, methoxy group, phenyl group, methoxy group substituted phenyl group, or -COOR It is a substituted methyl group, and R is a C1-C6 alkyl group.

According to an exemplary embodiment, R ₅ and R ₆ in Formula 1 are the same as or different from each other, and each independently hydrogen, a nitro group, an alkyl group having 1 to 6 carbon atoms, a carboxyl substituted alkyl group having 1 to 6 carbon atoms, or -SO ₃ Na to be.

According to an exemplary embodiment, R ₅ and R ₆ in Chemical Formula 1 are the same as or different from each other, and each independently hydrogen, nitro group, ethyl group, carboxyl group substituted ethyl group, or —SO ₃ Na.

According to an exemplary embodiment, R ₇ of Formula 1 is hydrogen; An alkyl group having 1 to 6 carbon atoms; Or an aryl group having 6 to 20 carbon atoms unsubstituted or substituted with an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an alkylaryl group having 7 to 20 carbon atoms.

According to an exemplary embodiment, R ₇ of Chemical Formula 1 is hydrogen, methyl, ethyl, propyl, butyl, pentyl, phenyl, methylphenyl, dimethylphenyl, trimethylphenyl, naphthyl, biphenyl substituted naphthyl, dimethylfluorene substituted naphthyl , Terphenyl substituted dimethylphenyl, methoxyphenyl, or dimethoxyphenyl. According to an exemplary embodiment, Chemical Formula 1 may be represented by the following structural formula.

Ar in the structural formula is a substituted or unsubstituted aryl group. For example, Ar may be an aryl group substituted with an alkyl group or an alkoxy group.

For example, compounds of the following structural formulas can be used. Compounds of the following structure have a maximum absorption wavelength at 490 nm and a maximum emission peak at 520 nm in solution.

However, the present invention is not limited only to the above formula, and various phosphors may be used.

According to another example, as the organic phosphor, a phosphor having a maximum absorption wavelength at 560-620 nm and an emission peak at 600-650 nm may be used in a solution state. For example, the compound of formula 2 may be used.

[Formula 2]

R ₁₁ , R ₁₂ and L are the same as or different from each other, and each independently hydrogen, an alkyl group, a cycloalkyl group, an aralkyl group, an alkylaryl group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a mercapto group, an alkoxy group, alkoxyaryl Group, alkylthio group, arylether group, arylthioether group, aryl group, haloaryl group, heterocyclic group, halogen, haloalkyl group, haloalkenyl group, haloalkynyl group, cyano group, aldehyde group, carbonyl group, carboxyl group, ester group Is a carbamoyl group, an amino group, a nitro group, a silyl group, or a siloxanyl group, or is linked to an adjacent substituent to form a substituted or unsubstituted aromatic or aliphatic hydrocarbon or hetero ring,

M is a m-valent metal, which is boron, beryllium, magnesium, chromium, iron, nickel, copper, zinc or platinum,

Ar ₁ to Ar ₅ are the same as or different from each other, and each independently hydrogen; An alkyl group; Haloalkyl group; Alkylaryl group; Amine group; Aryl alkenyl group unsubstituted or substituted by the alkoxy group; Or an aryl group unsubstituted or substituted with a hydroxy group, an alkyl group or an alkoxy group.

According to an exemplary embodiment, Chemical Formula 2 may be represented by the following structural formula.

The phosphor exemplified above has a half width of the emission peak in a solution state of 40 nm or less, and a half width of the emission peak in a film state of about 50 nm.

The content of the organic phosphor may be 0.005 parts by weight to 2 parts by weight based on 100 parts by weight of the resin matrix.

It is preferable that the material of the said resin matrix is a thermoplastic polymer or a thermosetting polymer. Specifically, the material of the resin matrix is poly (meth) acrylic, polycarbonate (PC), polystyrene (PS), polyarylene (PAR), polyurethane (TPU) such as polymethyl methacrylate (PMMA) ), Styrene-acrylonitrile (SAN), polyvinylidene fluoride (PVDF), modified polyvinylidene fluoride (modified-PVDF) and the like can be used. Compared with UV curable resins, thermoplastic or thermosetting polymers do not use UV energy generated during UV curing process and do not have radicals or cations that can attack organic phosphors. You can prevent it.

The color conversion film according to the above-described embodiment may have a thickness of 2 to 200 micrometers. In particular, the color conversion film may exhibit high luminance even at a thin thickness of 2 to 20 micrometers. This is because the content of the phosphor molecules contained on the unit volume is higher than that of the quantum dots. For example, the color conversion film having a thickness of 5 micrometers to which 0.5 wt% of the organic phosphor is applied may exhibit high luminance of 4000 nit or more based on the luminance of 600 nit of the blue backlight unit (blue BLU).

The color conversion film according to the above-described embodiment may be provided with a substrate on one surface. This substrate can function as a support in the production of the color conversion film. It does not specifically limit as a kind of base material, As long as it is transparent and can function as the said support body, it is not limited to the material and thickness. Transparent here means that visible light transmittance is 70% or more. For example, a PET film may be used as the substrate.

Method for producing a color conversion film according to another embodiment of the present application

It includes.

The color conversion layer is a step of coating a resin solution in which an organic phosphor is dissolved on a substrate; And it may be prepared by a method comprising the step of drying a resin solution coated on the substrate, or a method comprising the step of extruding an organic phosphor with a resin.

Since the above-mentioned organic phosphor is dissolved in the resin solution, the organic phosphor is uniformly distributed in the solution. This is different from the manufacturing process of the quantum dot film that requires a separate dispersion process.

Additives may be added to the resin solution as needed, for example, light diffusing agents such as silica, titania, zirconia, and alumina powder may be added. In addition, a dispersant may be further added for stable dispersion of the light diffusing particles.

The resin solution in which the organic phosphor is dissolved is not particularly limited as long as the above-described organic phosphor and resin are dissolved in the solution.

According to an example, the resin solution in which the organic phosphor is dissolved may be prepared by dissolving the organic phosphor in a solvent to prepare a first solution, dissolving the resin in a solvent to prepare a second solution, and mixing the first solution and the second solution. It can be manufactured by the method. When mixing the first solution and the second solution, it is preferable to mix homogeneously. However, the present invention is not limited thereto, and a method of simultaneously adding and dissolving an organic phosphor and a resin to a solvent, a method of dissolving an organic phosphor in a solvent and then a resin to dissolve, a method of dissolving a resin in a solvent, and then adding and dissolving an organic phosphor to a solvent may be used. Can be.

The organic phosphor contained in the solution is as described above.

As the resin contained in the solution, the above-mentioned resin matrix material, a monomer curable with this resin matrix resin, or a mixture thereof can be used. For example, the monomer curable with the resin matrix resin includes a (meth) acrylic monomer, which may be formed of a resin matrix material by UV curing. When using such a curable monomer, an initiator necessary for curing may be further added as necessary.

The solvent is not particularly limited and is not particularly limited as long as it can be removed by drying without adversely affecting the coating process. Non-limiting examples of the solvent include toluene, xylene, acetone, chloroform, various alcohol solvents, MEK (methyl ethyl ketone), MIBK (methyl isobutyl ketone), EA (ethyl acetate), butyl acetate, cyclohexa Non-cyclohexanone, PGMEA (propylene glycol methylethyl acetate), dioxane, DMF (dimethylformamide), DMAc (dimethylacetamide), DMSO (dimethylsulfoxide), NMP (N-methyl-pyrrolidone) Etc. may be used, and one or two or more kinds thereof may be used in combination. When using the said 1st solution and the 2nd solution, the solvent contained in each of these solutions may be the same and may differ. Even when different kinds of solvents are used in the first solution and the second solution, it is preferable that these solvents have compatibility so that they can be mixed with each other.

The process of coating the resin solution in which the organic phosphor is dissolved on a substrate may use a roll-to-roll process. For example, after the substrate is unrolled from the roll on which the substrate is wound, the resin solution in which the organic phosphor is dissolved may be coated on one surface of the substrate, dried, and then wound on the roll. When using a roll-to-roll process, it is preferable to determine the viscosity of the said resin solution to the range in which the said process is possible, for example, it can determine within the range of 200-2,000 cps.

As the coating method, various known methods may be used. For example, a die coater may be used, and various bar coating methods such as a comma coater and a reverse comma coater may be used.

After the coating is carried out a drying process. The drying process can be carried out under the conditions necessary to remove the solvent. For example, it is possible to obtain a color conversion layer including phosphors having a desired thickness and concentration on the substrate by drying under conditions that the solvent is sufficiently blown in an oven positioned adjacent to the coater in the direction in which the substrate proceeds during the coating process.

When the monomer curable with the resin matrix resin is used as the resin contained in the solution, curing such as UV curing may be performed before or simultaneously with the drying.

When extruding an organic phosphor together with a resin to form a film, extrusion methods known in the art may be used. For example, the organic phosphor may be polycarbonate-based (PC), poly (meth) acrylic or styrene-acrylonitrile. The color conversion layer can be manufactured by extruding together resin such as (SAN).

Subsequently laminating the adhesive or adhesive layer and the light collecting pattern layer on at least one surface of the color conversion layer simultaneously or sequentially; Alternatively, after laminating the adhesive or adhesive layer and the transparent substrate simultaneously or sequentially on at least one surface of the color conversion layer, a step of forming a light collecting pattern on the transparent substrate may be performed.

According to one example, the step of forming a light collecting pattern on the transparent substrate is coated with an ultraviolet curable resin on the transparent substrate, by using a master roll having a surface irregularities to form irregularities on the applied ultraviolet curable resin and ultraviolet A hardening pattern can be formed by hardening. A condensing pattern forming process is illustrated in FIG. 3. If necessary, a protective film may be further formed on one or both surfaces.

Another embodiment of the present application provides a backlight unit including the color conversion film described above. The backlight unit may have a backlight unit configuration known in the art except for including the color conversion film. The backlight unit may include a side chain type light source (blue in FIG. 2), a reflection plate surrounding the light source (green in FIG. 2), a light guide plate emitting light directly from the light source or inducing light reflected from the reflecting plate (apricot color in FIG. 2), A reflective layer (light blue in FIG. 2) provided on one surface of the light guide plate, and a color conversion film (white in FIG. 2) provided on an opposite surface of the light guide plate opposite to the reflective layer. In FIG. 2, the shaded portions are light scatter patterns of the light guide plate. The light introduced into the light guide plate has non-uniform light distribution due to the repetition of optical processes such as reflection, total reflection, refraction, and transmission. A two-dimensional light dispersion pattern may be used to guide the light to uniform brightness. The light scattering pattern scatters light introduced into the light guide plate, thereby inducing a uniform brightness. However, without being limited by the above descriptions, the light source may be used as a side chain type as well as a direct type, and a reflecting plate or a reflecting layer may be omitted or replaced with another configuration as necessary, and may be further film, such as A light diffusing film, a light collecting film, a brightness enhancing film, and the like may be further provided.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.

Example One

The first solution was prepared by dissolving the green organic phosphor of the following structural formula and the red organic phosphor of the following structural formula in a solvent DMF.

Green organic phosphor red organic phosphor

The thermoplastic resin SAN (styrene-acrylonitrile) was dissolved in solvent DMF to prepare a second solution.

The first solution and the second solution were mixed so that the amount of the organic phosphor was 0.5 parts by weight based on 100 parts by weight of the SAN, and TiO ₂ was added thereto and mixed homogeneously. Solid content of the mixed solution was 20% by weight and viscosity was 200 cps. The solution was coated on a PET substrate and dried to prepare a white color conversion film.

Laminated the color conversion film on the back of the prism sheet of triangular cross-sectional shape (pitch 25 micrometer, height 12.5 micrometer) made of acrylic resin (produced with NFC-type acrylic adhesive, adhesive layer thickness 25 micrometers), and then using a light guide plate (Fig. 5 yellow). At this time, it was arrange | positioned so that the longitudinal direction of the prism of a prism sheet may be parallel to the longitudinal direction (y-direction) of the edge type light source (blue) of FIG. Next, the result of measuring the luminance change value according to the viewing angle in the direction (x-axis direction) perpendicular to the longitudinal direction of the edge type light source is shown in FIG. 4.

Example 2

A prism pitch of 50 micrometers and a height of 25 micrometers were applied in the same manner as in Example 1. The luminance change value according to the x-axis direction angle is shown in FIG. 6.

Example 3

The same procedure as in Example 2 was conducted except that the pressure-sensitive adhesive layer had a thickness of 50 micrometers. The luminance change value according to the x-axis direction angle is shown in FIG. 6.

Comparative example One

Except not laminating the prism sheet and the color conversion film, and the white color conversion film and the prism sheet prepared in Example 1 was carried out in the same manner as in Example 1 except that the stack (tack) without the adhesive or adhesive, the x-axis The change in luminance according to the direction angle is shown in FIG. 4.

4, the vertical axis represents luminance nit, and the horizontal axis represents viewing angle (°).

Comparative example 2

A prism pitch of 50 micrometers and a height of 25 micrometers were applied in the same manner as in Comparative Example 1. The luminance change value according to the x-axis direction angle is shown in FIG. 6.

As shown in FIGS. 4 and 6, the luminance of the product laminated with the air gap is high at the viewing angle within ± 15 degrees of the front surface, but the prism sheet and the color converting film at the viewing angle exceeding ± 15 degrees. It was confirmed that the brightness of the product laminated with higher. In addition, the Qy of the Example and the Comparative Example was calculated in consideration of the light emission amount of photon in all directions, showing high values of Qy of 0.95 or more in both the Example and the Comparative Example.

On the other hand, in Comparative Examples 1 and 2, after laminating the PET film using the adhesive layer on the upper surface of the white color converting film as in the conventional color converting film, and then laminating the prism sheet again, brightness and quantum efficiency (Qy It is obvious that) will be further reduced.

Claims

Resin matrix; And a color conversion layer dispersed in the resin matrix, the color conversion layer comprising two or more organic phosphors that absorb blue or green light and emit light having a wavelength different from that of the absorbed light;
An adhesive or adhesive layer provided on at least one surface of the color conversion layer; And
A light collecting pattern layer attached to a surface opposite to the surface of the adhesive or adhesive layer facing the color conversion layer,
The material of the resin matrix is polycarbonate (PC), polystyrene (PS), polyarylene (PAR), styrene-acrylonitrile (SAN), polyvinylidene fluoride (PVDF) or modified polyvinyl. Lithium fluoride (modified-PVDF),
The organic phosphor is selected from the following structural formulas,
The material of the adhesive or adhesive layer is a non-carrier type adhesive film,
The thickness of the adhesive or adhesive layer is 25μm ~ 100μm color conversion film:

Ar in the structural formula is a substituted or unsubstituted aryl group.

The color conversion film of claim 1, wherein the light collecting pattern layer comprises a transparent substrate and a light collecting pattern provided on the transparent substrate, or at least one surface thereof is deformed to include a transparent substrate having a light collecting pattern.

The lens of claim 2, wherein the condensing pattern comprises: a prism of a triangular cross section, a prism of a pyramid shape, a square pyramid, a triangular prism, a curved lens; Or a circular or elliptical lenticular lens formed regularly or irregularly.

Resin matrix; And an organic phosphor dispersed in the resin matrix and including an organic phosphor that absorbs blue or green light and emits light having a wavelength different from that of the absorbed light. And
Laminating an adhesive or adhesive layer and a light collecting pattern layer simultaneously or sequentially on at least one surface of the color conversion layer; Or laminating an adhesive or adhesive layer and a transparent substrate on at least one surface of the color conversion layer simultaneously or sequentially, and then forming a light collecting pattern on the transparent substrate.
Method for producing a color conversion film according to any one of claims 1 to 3 comprising.

A backlight unit comprising the color conversion film according to any one of claims 1 to 3.