KR20200016142A - Light conversion item and manufacturing method thereof - Google Patents

Abstract

The present invention provides a light conversion item, which comprises: a light conversion layer including a quantum dot in a thermoplastic polymer resin; and a protective layer formed on one or both surfaces of the light conversion layer. The protective layer includes at least one of a carbon-derived material or a metallic inorganic material. The present invention has a simpler structure than the prior art, can secure chemical resistance and heat dissipation to block oxygen and moisture, and can manufacture the light conversion item in a simpler process than before.

Description

Light conversion article and manufacturing method thereof

The present invention relates to a light conversion article and a method of manufacturing the same.

A quantum dot is a semiconductor material having a crystal structure of several nano-sizes, and the wavelength of emission is different depending on the size. If the quantum dot is smaller than a certain size, the electron motion characteristics in the semiconductor material in the bulk state is further restricted, which may result in a quantum confinement effect that the emission wavelength is different from the bulk state. It is known that the quantum dot can be used as a fluorescent material that emits light through an external light source or a light emitting material that electrically emits light, thereby improving characteristics of the display or utilizing the display itself. On the other hand, the quantum dots are used in combination in a small amount in the polymer photoconversion film, for example, to enter the backlight unit (BLU).

However, the light emitter such as the quantum dot has a problem of oxidation due to surface oxidation when exposed to moisture and oxygen in the air. As a method for compensating this, the polymer resin in which the light emitter is dispersed between two barrier films is dispersed and cured. It may be prepared by coating a polymer resin in which a light emitting material such as a quantum dot is dispersed on a barrier film or on a single barrier film, and then laminating a barrier film again. In addition, it may optionally be prepared in a multi-layer structure including a base layer and a metal deposition layer included in the bottom of the barrier film.

This photoconversion film is disposed on the light guide plate of the blue BLU module (on-surface method). The light conversion film may correspond to various display screen sizes from small to large.

On the other hand, in the conventional photoconversion film, barrier films are adhered to both surface directions of the polymer resin layer, whereby moisture and oxygen infiltrate in the surface direction can be effectively prevented. However, there have been cases where the quantum dots are damaged by deterioration due to heat generated from the light emitting body or the display panel including the quantum dots.

Furthermore, in the multi-layered light conversion film, since the components of each layer have different refractive indices, light distortion may occur, so that high thickness uniformity is required in order to prevent such light distortion. there was.

In addition, the conventional light conversion film requires a multi-step process as described above, can be manufactured only in the form of a flat film, there was a limitation that can not be used in various technical fields to which the curved shape is applied.

The present invention provides a light conversion article having a simpler structure than the related art, and capable of securing chemical resistance and heat dissipation to block oxygen and moisture.

In addition, the present invention provides a method for producing a light conversion article that can produce a light conversion article in a simpler process than the prior art.

In order to solve the above problems, the present invention includes a light conversion layer including a quantum dot in a thermoplastic polymer resin, and a protective layer formed on one or both sides of the light conversion layer, wherein the protective layer is a carbon-derived material or a metallic inorganic material It provides a light conversion article comprising at least any one.

In addition, the present invention is the step of dispersing the quantum dots in the first thermoplastic polymer resin, and melting and mixing the first thermoplastic polymer resin in which the quantum dots are dispersed to form a light conversion layer, and on one or both sides of the light conversion layer Forming a protective layer, wherein the protective layer comprises at least one of a carbon-derived material and a metallic inorganic material.

Here, the forming of the light conversion layer may be performed by molding a first thermoplastic polymer resin in which quantum dots are dispersed into pellets using a molding machine, and then forming a flat or curved shape using the same or different molding machine as the molding machine. It provides a method for producing a light conversion article to form a light conversion layer.

In the forming of the light conversion layer, the first thermoplastic polymer in which the quantum dots are dispersed is formed into pellets using a molding machine, and the molded pellets are formed in the second thermoplastic polymer resin heated above a melting temperature. ) Is added to melt and mix, and then the mixture is formed using a molding machine that is the same as or different from the molding machine to form a light conversion layer having a flat or curved shape.

Further, the first thermoplastic polymer resin and the second thermoplastic polymer resin may be the same or different.

The forming of the protective layer may include coating, depositing, or laminating at least one of carbon-derived materials and metallic inorganic materials on one or both surfaces of the protective layer.

The light conversion article according to the embodiment of the present invention may adopt a simpler structure than the conventional one, and may block moisture and oxygen from the light conversion layer to secure excellent chemical resistance.

In addition, by including a material having excellent thermal conductivity in the protective layer, it is possible to ensure heat dissipation that can prevent deterioration of the quantum dots.

Furthermore, according to one embodiment of the present invention, the manufacturing process can be simplified to easily manufacture the light conversion article. In addition, since the injection molding and extrusion molding processes can be used in the manufacture of the light conversion article, it is possible to provide a light conversion article and a method of manufacturing the same that can be applied not only to planar films but also to various articles having three-dimensional or curved shapes. have.

1 is a view showing an example of a light conversion article according to an embodiment of the present invention.
2 is a view showing another example of the light conversion article according to an embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. It is to be understood that the invention is not limited to specific embodiments, and that various modifications, equivalents, and / or alternatives of the embodiments of the invention are included. In connection with the description of the drawings, similar reference numerals may be used for similar components.

In this document, expressions such as "have", "may have", "include", or "may include" include the presence of a corresponding feature (e.g., numerical, functional, operational, or component such as a component). Does not exclude the presence of additional features.

In this document, expressions such as "A or B", "at least one of A or / and B", or "one or more of A or / and B" may include all possible combinations of items listed together. . For example, "A or B", "at least one of A and B", or "at least one of A or B" includes (1) at least one A, (2) at least one B, Or (3) both of cases including at least one A and at least one B.

Expressions such as "first," "second," "first," or "second," as used herein, may modify various components, regardless of order and / or importance, and may modify one component to another. It is used to distinguish a component and does not limit the components. For example, without departing from the scope of rights described herein, the first component may be referred to as the second component, and similarly, the second component may be referred to as the first component.

The expression "configured to" used in this document is, for example, "suitable for", "having the capacity to" depending on the situation. It may be used interchangeably with "designed to", "adapted to", "made to", or "capable of". The term "configured to" does not necessarily mean "specifically designed to".

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise. The terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art. Among the terms used in this document, the terms defined in the general dictionary may be interpreted as having the same or similar meaning as the meaning in the context of the related art, and unless it is clearly defined in this document, in an ideal or excessively formal meaning. Not interpreted. In some cases, even if terms are defined in the specification, they may not be interpreted to exclude embodiments of the present disclosure.

1. Light conversion article

Hereinafter, the Example of this invention is described in detail. The light conversion article in this embodiment can be applied to various technical fields such as a wavelength conversion member or an illumination member for display.

To this end, the present invention includes a light conversion layer including a quantum dot in the thermoplastic polymer resin, and a protective layer formed on one or both sides of the light conversion layer, the protective layer is at least one of a carbon-derived material or a metallic inorganic material It provides a light conversion article comprising a.

The light conversion layer includes a plurality of quantum dots emitting light of different wavelength bands, and converts and emits light emitted from a light source such as a light emitting module through a quantum dot effect. For example, when blue light is irradiated from a light source, it is converted into white light and emitted. The light conversion layer may include a plurality of quantum dots and a thermoplastic polymer resin.

The thermoplastic polymer resin has high density and high homogeneity of crystal structure, excellent heat stability such as thermal deformation temperature and linear expansion coefficient, and excellent mechanical properties such as tensile strength and tensile elongation at break, and high light transmittance and low light dispersion. It is excellent in optical characteristics such as light resistance of birefringence, low absorptivity, low mold shrinkage, and high workability. Such thermoplastic polymer resins include polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile butadiene styrene (ABS), styrene acrylonitrile copolymer (SAN), polymethyl methacrylate (PMMA), and COC / Cyclic olefin copolymer / Polymer (COP), Polymethylpentene (PMP), Polyethylene terephthalate (PET), Polycarbonate (PC), Polybuthylene terephthalate (PBT), Polyamide: Nylon 6,66 (PA), Polyoxymethylene (POM), Polyphenyleneoxide (PPO) Polyphenylenesulfide (PPS), Polyphethersulfone (PES), Polyamideimide (PAI), Teflon Fluororesin (PTFE: Polytetrafluoroethylene, PCTFE: Polychlorotrifluoroethylene, PVDF: Polyvinylidenedifluoride), PEEK (Polyetheretherketone), and TPE (Thermo Plastic Elastomer), TPU It may be to include one or more selected from the group consisting of, glass fiber (Glass Fiber), carbon fiber (Carbon Fiber), may be added by mixing the inorganic filler as a reinforcing material.

While allowing the quantum dots to be uniformly dispersed in the light conversion layer, the thermoplastic polymer resin used as the matrix of the light conversion layer preferably has low oxygen and moisture permeability, and also preferably has high light stability and chemical stability. . Accordingly, the liquid phase refractive index of the polymer resin may be 1.40 to 1.60, and the thermoplastic polymer resin may have a light transmittance of 90% or more after forming the light conversion layer.

By using the thermoplastic resin as described above in the manufacture of the light conversion layer, it is possible to extrusion molding or injection molding in the molten state without the need for a separate curing process to produce a light conversion layer of various shapes.

The quantum dots are particles in which nano-sized II-IV semiconductor particles form a core. The fluorescence of the quantum dots is light generated when electrons are excited down from the conduction band to the valence band.

The quantum dot includes at least one selected from the group consisting of Si-based nanocrystals, group II-VI, group III-V, group IV-VI, group IV, and mixture particles thereof.

Specifically, the semiconductor, Si, Ge, Sn, Se, Te, B, C, P, BN, BP, BAs, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs , InSb, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdxSeySz, CdTe, HgS, HgSe, HgTe, BeS, BeSe, BeTe, MgS , GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbO, PbS, PbSe, PbTe, CuF, CuCl, CuInS2, Cu2SnS3, CuBr, CuI, Si ₃ N ₄ , Ge ₃ N ₄ , Al ₂ O ₃ , (Al , Ga, In) ₂ (S, Se, Te) ₃ , CIGS, CGS, (ZnS) _y (Cu _x Sn _1-x S ₂ ) _1-y , or a mixture of at least two or more of these semiconductors It includes a mixed semiconductor.

The quantum dot may have a core / shell structure or an alloy structure, and may be a graphene quantum dot made of graphite.

In addition, in terms of luminous efficiency of the quantum dots and ensuring dispersibility in the thermoplastic polymer resin, the semiconductor quantum dots may be surface-treated (or coated) in a specific manner and commercialized quantum dot-polymer composite (Nanocomposite) quantum dots may be used. One example of such a quantum dot may be one synthesized to have a ligand capable of hydrogen sillation.

Furthermore, it may be one comprising a thiol-substituted silicon ligand in the fluorescent semiconductor core / shell nanocrystals.

In addition, the chemical resistance surface treatment of the quantum dots may be performed by performing a cation exchange reaction on the metal ions present on the surface of the quantum dots to exchange the metal ions on the surface of the quantum dots. have.

The average particle diameter (d50) of the core / shell type quantum dots may be 0.01 nm to 10 nm or less, and the polymer-quantum dot composite quantum dots subjected to surface treatment (or coating) may be 20 nm to 200 nm. If the average particle diameter (d50) of the quantum dot exceeds 200 nm, light is not lost in terms of luminous efficiency, and if it is less than 0.01 nm, it is not preferable in terms of dispersion degree in the thermoplastic polymer resin.

The light conversion layer may include quantum dots representing one or more colors selected from the group consisting of red light, green light, blue light, and yellow light. The quantum dots can absorb ultraviolet light having a wavelength between about 100 and about 400 nm and visible light having a wavelength between about 380 and 780 nm. In one embodiment of the present invention blue light may have an emission peak in the wavelength region of more than 410 nm and less than 500 nm, green light may have an emission peak in the wavelength region of more than 500 nm and less than 550 nm, yellow light is more than 550 nm The light emission peak may be in a wavelength range of less than 600 nm, and the red light may have light emission peak in a wavelength range of 600 nm or more and less than 660 nm. In the present invention, blue, green, yellow, and red are represented by four names for convenience, but the wavelength region may include various colors such as orange, indigo, and violet in addition to these colors.

The thickness of the light conversion layer according to an embodiment of the present invention may be 50 ㎛ to 10 mm. When the thickness of the light conversion layer is less than the above range, in order to satisfy a certain level of color conversion properties, the quantum dots should be present at a higher density than the thick light conversion layer, and in this case, the interval between the quantum dots becomes very narrow, which causes The degradation of quantum dots due to accelerated degradation or efficiency degradation may occur due to the continuous absorption of other quantum dots adjacent to absorb light emitted from the secondary light source by absorbing light from the primary light source. When the thickness of the light conversion layer exceeds the above range, the efficiency degradation caused by the high-density quantum dots may not occur or may be lowered. Economic problems such as occurrence problems, lowered winding amount per roll, failure of the final product, such as application of large diameter cores, and increased production cost.

Since the protective layer according to an embodiment of the present invention is integrated in a fused form with the light conversion layer, there is no need for a separate adhesive layer for attachment between the light conversion layer, thereby simplifying the manufacturing process and finally forming the light. The conversion article thickness can be made thinner.

The protective layer may be formed on one or both surfaces of the light conversion layer, wherein the protective layer may include at least one of a carbon-derived material and a metallic inorganic material.

Preferably, the protective layer is integrally formed in a fused shape on the light conversion layer, and is provided on the top and bottom surfaces of the light conversion layer, respectively, to cover the top and bottom surfaces of the light conversion layer to form an interior of the light conversion layer. Moisture can be prevented from entering, and the light conversion layer can be prevented from being oxidized in contact with air.

Furthermore, the protective layer includes at least one of a highly conductive carbon-derived material or a metallic inorganic material, thereby easily dissipating heat generated in the quantum dot light emission of the light conversion layer and accumulated inside the light conversion layer to the outside. Therefore, it is possible to ensure heat dissipation that can prevent deterioration of the quantum dots.

The carbon-derived material may include one or more selected from the group consisting of graphene, graphene oxide, and carbon nanotubes, and preferably, a barrier function having high air and moisture barrier properties and a heat dissipation function having high thermal conductivity. In terms of securing the may further include an inorganic filler such as alumina, silicon, carbonate or fillers such as organic, organic and inorganic hybrid form.

The metallic inorganic material may be one or more selected from the group consisting of SiO ₂ , Al ₂ O ₃ , TiO ₂ , Ta ₂ O ₅ , ZrO ₂ , HfO ₂ , Nb ₂ O ₅ , Si ₃ N ₄ , and MgF ₂ . In an aspect of securing a barrier function having high air and moisture barrier properties and a high heat conductivity, the organic polymer may further include a filler such as an organic / inorganic hybrid form.

In addition, it may be preferably a composite of the carbon-derived material and the metallic inorganic material. In this case, the carbon-derived material and the metallic inorganic material may be 1: 1 to 10 by weight.

When the weight ratio of the carbon glass material and the metallic inorganic material is outside the above range, it is not preferable in view of light transparency due to light transparency and scattering.

The protective layer may be formed by a process such as coating, deposition, lamination, or the like along at least one of the top and bottom surfaces of the light conversion layer. Unlike conventional barrier layers, by using a carbon-derived material or a metallic inorganic material having chemical resistance and excellent thermal conductivity as a protective layer directly laminated on the light conversion layer, not only a planar light conversion layer, Even in the case of a curved light conversion layer, it is possible to form a stable protective layer.

The protective layer may have a thickness of 50 nm to 20 μm. When the thickness of the protective layer is less than the above range, it is not preferable to secure chemical resistance and heat dissipation due to the thickness too thin, and when the thickness of the protective layer exceeds the above range, the thickness of the entire photoconversion article is increased. However, since the heat inside the light conversion layer cannot be smoothly discharged, it is not preferable in terms of securing heat dissipation.

The light conversion article according to an embodiment of the present invention may further include a film layer made of a polymer resin as a base material in order to secure stability and reliability of the base material, and as the polymer resin, PET commonly used in the art may be used. If one more film layer is added, the thickness of the photoconversion article may be added from 10 to 100 μm.

As shown in FIG. 1, the photoconversion article including the photoconversion layer and the protective layer as described above is a photoconversion film 100 that includes a plurality of red quantum dots 101a and green quantum dots 101b. It may be a layer 102 and a protective layer 103.

As another example, the light conversion article may have a curved shape through extrusion molding, injection molding, or vacuum / blow molding, as shown in FIG. 2. The injection molded article 200 may have a semi-circular tube shape and include a light conversion layer 202 and a protective layer 203 including a plurality of red quantum dots 201a, green quantum dots 201b.

As described above, the light conversion article according to an embodiment of the present invention may be used as a light conversion film used for a display. As the light conversion extrusion molded product or injection molded product, since a three-dimensional shape such as a curved surface and a spherical shape can be implemented, the light conversion extrusion molded article or injection molded article may be directly applied to an article such as a lighting fixture.

For example, the lighting cover of the luminaire can be molded using the light conversion water chamber of the present invention. Here, illumination refers to the state which provides light indoors or outdoors. That is, it is also possible to shape | mold the light conversion article of this invention to bulb shape, and can also shape | mold in the shape of the surface cover type illumination cover.

2. Manufacturing method of light conversion article

In addition, each step of the process according to the present invention is not limited to the one in a complete time series, but the invention is easily described according to the order applied to a general manufacturing process, and the process order of the invention is changed as necessary. Of course, it can be modified.

Specifically, the method for manufacturing a light conversion article according to an embodiment of the present invention may include forming a light conversion layer after dispersing a quantum dot in a first thermoplastic polymer resin and melting and mixing the first thermoplastic polymer in which the quantum dots are dispersed. And forming a protective layer on one or both surfaces of the light conversion layer, wherein the protective layer includes at least one of a carbon-derived material and a metallic inorganic material.

In the step of forming the light conversion layer, it has high density and homogeneity of crystal structure, excellent heat stability and mechanical properties, and excellent optical properties such as high light transmittance (90% or more) and light resistance, and has low absorbency and molding shrinkage and processing Nano-size quantum dots are injected into the first thermoplastic polymer resin having high formability, mixed, melted and extruded, and continuously rolled using the same rolling molding machine, extrusion molding machine, injection molding machine, and vacuum / hollow molding machine. The photoconversion article can be made by extrusion molding, injection molding or vacuum / blow molding. In this case, since the desired form of the article can be obtained immediately without producing a composite such as pellets, the process time can be shortened and the manufacturing cost can be reduced efficiently.

According to another embodiment of the present invention, in the manufacturing step of the light conversion layer, after melting and mixing the first thermoplastic polymer resin in which the quantum dots are dispersed may be formed into pellets through a molding machine, the master batch ( It may be manufactured in the form of a master batch and formed into pellets. Thereafter, the pellets are directly rolled, extruded, injection molded or vacuum / hollowed using a rolling molding machine, an extrusion molding machine, an injection molding machine, or a vacuum / hollow molding machine. It may be to form a light conversion layer through the molding (vacuum / blow molding).

According to another embodiment of the present invention, by molding the first thermoplastic polymer resin in which the quantum dots are dispersed into pellets, and injecting the molded pellets into the second thermoplastic polymer resin heated above the melting temperature After melting and mixing, the mixture is rolled, extruded, injection molded or vacuumed / molded using a roll molding machine, an extrusion molding machine, an injection molding machine, or a vacuum / hollow molding machine. It may be to form a light conversion layer through (vacuum / blow molding).

In this case, the pellets are added to the molten resin at a temperature higher than the melting temperature of the second thermoplastic polymer resin or solidified without a material or a special additive for a separate curing reaction to prepare a planar film, or to convert a curved optical shape. Extruded or injection molded products can be produced.

When the quantum dots are added to the thermoplastic polymer resin and dispersed in the light conversion layer forming step, the quantum dots may use particles in the form of a solution or powder dispersed in water or an organic solvent.

The first thermoplastic polymer resin and the second thermoplastic polymer resin may be the same or different, and may use the same material as the thermoplastic resin in the light conversion article as described above.

Here, the second thermoplastic resin is important to control the viscosity at the time of melting in order to ensure the uniformity of the thickness of the light conversion layer, in one embodiment of the present invention, the second thermoplastic polymer resin has a viscosity of 100 to 3000 at the time of melting cps, more specifically, may be 200 to 2000cps. When the viscosity of the second thermoplastic polymer resin is less than 100 cps, there may be a problem in that a product having a desired thickness level may not be made due to a liquid flow phenomenon due to a low viscosity. It may be difficult and difficult to supply resin.

The forming of the protective layer may include coating, depositing, or laminating at least one of carbon-derived materials and metallic inorganic materials on one or both surfaces of the protective layer.

The carbon-derived material may include one or more selected from the group consisting of graphene, graphene oxide, and carbon nanotubes. In the case of forming a protective layer using such a carbon-derived material, as an example, graphene is directly grown on the protective layer by plasma chemical vapor deposition (PECVD) using a hydrocarbon gas as a carbon source on the photoconversion layer to obtain a protective layer. Can be.

The metallic inorganic material may be one or more selected from the group consisting of SiO ₂ , Al ₂ O ₃ , TiO ₂ , Ta ₂ O ₅ , ZrO ₂ , HfO ₂ , Nb ₂ O ₅ , Si ₃ N ₄ , and MgF ₂ . It may be to include. In the case of forming a protective layer as the metallic inorganic material, for example, as a thin film, it is coated by a method such as sputtering, E Beam Evaporation, PECVD, may be coated with a single layer, or may be coated with multiple layers by lamination. It may be.

In addition, preferably, the coating solution obtained by dispersing at least one of the above-described carbon-derived material and metallic inorganic material in water with a surfactant or a UV-curing agent in an organic solvent is coated with the optical solution. The protective layer of the thin film may be formed by directly applying a thickness of 300 nm to 800 nm through spray coating, spin coating, or roll to roll slit die coating on the conversion layer. have.

In the light conversion article according to the embodiment of the present invention, since the protective layer is directly formed in a fused form on the light conversion layer, the number of the protective layers covering the light conversion layer is reduced to form the final conversion of the light conversion article. The thickness can be made slimmer, the manufacturing process is simplified and manufacturing costs are further reduced. Furthermore, the protective layer can be easily formed in the three-dimensional light conversion layer.

The embodiments disclosed herein are presented for the purpose of explanation and understanding of the disclosed, technical details, and do not limit the scope of the invention. Accordingly, the scope of this document should be construed as including all changes or various other embodiments based on the technical idea of the present invention.

Example

Example 1 (Formation of Flat Film Type Light Conversion Article)

Formation of Light Conversion Layer

0.6 parts by weight of surface-treated CdSe + ZnS Green quantum dots (QD), and 0.1 parts by weight of surface-treated CdSe + ZnS Red quantum dots (QD), were compared to 100 parts by weight of polycarbonate (PC) thermoplastic polymer, and the pellets were compounded. After making, it was rolled to form a light conversion layer in the form of a flat film having a thickness of 200 um.

Formation of a protective layer

After dispersing graphene in water containing a surfactant on the flat film-form light conversion layer formed above, it is applied to both sides of the flat film film-shaped light conversion layer with a thickness of 500 nm, and then thermally cured. Formed.

Example 2 (Formation of Light Conversion Article in the Form of Semicircular Tube)

Formation of Light Conversion Layer

0.6 parts by weight of surface-treated CdSe + ZnS Green quantum dots (QD), and 0.1 parts by weight of surface-treated CdSe + ZnS Red quantum dots (QD), were compared to 100 parts by weight of polycarbonate (PC) thermoplastic polymer, and the pellets were After the production, extrusion molding was performed to form a light conversion layer in the form of a semi-circular tube having a thickness of 350 um.

The semi-circular tube-shaped light conversion layer was molded through an extrusion die installed in an extrusion molding machine by setting the cylinder temperature to 260 ° C. to 280 ° C. using the following extrusion machine.

- Electric Extrusion Machine: TEK30-L / D40-2SF-1V-AC11

- Manufacturer: SM PLATEK CO., LTD

- Twin Screw Co-Rotating, Ø30 mm * L / D 40, 10 Barrels

- Gear Box Output Torque 233 Nm

Formation of a protective layer

After dispersing graphene in water containing a surfactant on a semi-circular tube-shaped light conversion layer formed above, spray coating was applied to both sides of the light conversion layer to a thickness of 500 nm to form a protective layer. .

Test Example

The light conversion articles formed in Examples 1 and 2 were tested through a quantum dot liquid crystal display (QD LCD) device and a thermo-hygrostat as described below to measure basic physical properties, chemical resistance and heat dissipation.

Basic property

The light conversion articles manufactured in Examples 1 and 2 were used to display luminance (Lv) and color coordinates (Cx, Cy) using a quantum dot liquid crystal display (QD LCD) device adopted in 28-inch flat panel monitor of S Electronics Co., Ltd. The experiment to measure was performed.

The quantum dot liquid crystal display (QD LCD) device used in the experiment is as follows.

Display Overview: 70.8 cm, Flat, 16: 9, Resolution 3840 * 2160

-Structure: Light source (Blue LED) + LGP + Optical sheet (diffusion + 2 prism)

-Panel Type: TN

-Monitor brightness and power consumption: 300 cd / m * M, 59W

(1) luminance (Lv)

The luminance values Lv of Examples 1 and 2 were measured using a CHROMA METER CS-200 (KONICA MINOLTA) using the quantum dot liquid crystal display (QD LCD) device. In Example 1, an A4 size film sample was placed at the center of the quantum dot liquid crystal display (QD LCD) device, and three averages of the centers were measured to obtain an average value. The measurement angle was measured at 90 ° perpendicular to the liquid crystal display plane. In Example 2, place the semi-circular tube perpendicular to the liquid crystal display plane in the center of the quantum dot liquid crystal display (QD LCD) device, and cover only the semi-circular tube portion to expose the BLU light, and then measure three locations about the center. The average value was calculated | required.

(2) Color coordinate value (Cx, Cy)

 Color coordinate values (Cx, Cy) were measured together with the luminance (Lv) measurement of Examples 1 and 2 using a CHROMA METER CS-200 (KONICA MINOLTA) using the quantum dot liquid crystal display (QD LCD) device. The experimental results are shown below.

division Example 1 Example 2 Luminance (Lv) 4,276 3,986 Color coordinates (C, Cy) Cx: 0.2881
Cy: 0.2662 Cx: 0.2765
Cy: 0.2512

Chemical resistance

After the light conversion articles prepared in Examples 1 and 2 were left for 500 hours at 85 ° C. and 85% relative humidity, the degree of degradation of the edges was tested. The experimental results are shown below.

division Edge deterioration degree (mm) Example 1 0 Example 2 0

Heat dissipation

The photoconversion articles prepared in Examples 1 and 2 were allowed to stand for 500 hours at a temperature of 85 ° C. and a relative humidity of 85%, a constant temperature and a humidity chamber. After that, the luminance was measured with a CHROMA METER CS-200 (KONICA MINOLTA) using the quantum dot liquid crystal display (QD LCD) device and compared with the initial decrease in luminance. The experimental results are shown below.

division % Decrease in brightness relative to initial stage Example 1 -2% to + 2% Example 2 -2% to + 2%

Claims (12)

A light conversion layer including a quantum dot in the thermoplastic polymer resin, and
A protective layer formed on one or both surfaces of the light conversion layer;
Wherein the protective layer comprises at least one of a carbon derived material or a metallic inorganic material.
The method according to claim 1,
The thermoplastic polymer resin is polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile butadiene styrene (ABS), styrene acrylonitrile copolymer (SAN), polymethyl methacrylate (PMMA), and COC / COP (COP). Cyclic olefin copolymer / Polymer, PMP (Polymethylpentene), PET (Polyethylene terephthalate), PC (Polycarbonate), PBT (Polybuthylene terephthalate), PA (Polyamide: Nylon 6,66), POM (Polyoxymethylene), PPO (Polyphenyleneoxide), PPS ( Polyphenylenesulfide), PES (Polyphethersulfone), PAI (Polyamideimide), Teflon Fluororesin (PTFE: Polytetrafluoroethylene, PCTFE: Polychlorotrifluoroethylene, PVDF: Polyvinylidenedifluoride), PEEK (Polyetheretherketone) and TPE (Thermo Plastic Elastomer), TPU (Thermo PlasticThermo Plastic) Light conversion article comprising at least one selected from the group.
The method according to claim 2,
The thermoplastic polymer resin further comprises a glass fiber (Glass Fiber), carbon fiber (Carbon Fiber), an inorganic filler.
The method according to claim 1,
The thermoplastic polymer resin has a light transmittance of 90% or more after forming the light conversion layer.
The method according to claim 1,
The quantum dots include at least one selected from the group consisting of Si nanocrystals, group II-VI, group III-V, group IV-VI, group IV, graphene quantum dots, and mixture particles thereof, An optical conversion article having an average particle diameter (d50) of 20 nm to 200 nm.
The method according to claim 1,
The carbon-derived material is a light conversion article comprising one or more selected from the group consisting of graphene, graphene oxide, carbon nanotubes.
The method according to claim 1,
The metallic inorganic material may be one or more selected from the group consisting of SiO ₂ , Al ₂ O ₃ , TiO ₂ , Ta ₂ O ₅ , ZrO ₂ , HfO ₂ , Nb ₂ O ₅ , Si ₃ N ₄ , and MgF ₂ . Light conversion article which includes.
Dispersing the quantum dots in the first thermoplastic polymer resin, melting and mixing the resin with the first thermoplastic polymer in which the quantum dots are dispersed, and forming a light conversion layer, and
Forming a protective layer on one or both surfaces of the light conversion layer;
Wherein the protective layer comprises at least one of a carbon-derived material and a metallic inorganic material.
The method according to claim 8,
Forming the light conversion layer,
After molding the first thermoplastic polymer in which the quantum dots are dispersed into pellets using a molding machine,
Method for producing a light conversion article to form a flat or curved light conversion layer using the same or different molding machine than the molding machine.
The method according to claim 8,
Forming the light conversion layer,
After the first thermoplastic polymer in which the quantum dots are dispersed is molded into pellets using a molding machine, the molded pellets are introduced into a second thermoplastic polymer resin heated above a melting temperature, and then melted and mixed.
And using the same or different molding machine as the mixture to form a flat or curved light conversion layer.
The method according to claim 10,
Wherein the first thermoplastic polymer resin and the second thermoplastic polymer resin are the same or different.
The method according to claim 8,
The forming of the protective layer may include coating, depositing, or laminating at least one of a carbon-derived material and a metallic inorganic material on one or both surfaces of the protective layer.

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