TWI786350B - Optical laminate and organic light emitting device - Google Patents

Abstract

The present application relates to an optical laminate and an organic light emitting device. The optical laminate of the present application has excellent performance of blocking ultraviolet rays, especially ultraviolet rays including a blue region of 380 nm or more. In particular, when the optical laminate of the present application has been applied to an organic light emitting device, it can minimize lifetime shortening of the blue light source in the organic light emitting device. The optical laminate of the present application can exhibit excellent durability simultaneously, without changing color values largely and impairing optical characteristics. The optical laminate is particularly suitable when used in organic light emitting devices.

Description

Optical stack and organic light emitting device

This application claims the benefit of the filing date of Korean Patent Application No. 10-2018-0152232 filed with the Korea Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

This application relates to an optical stack and its use.

In order to protect the polarizer, the polarizer can block ultraviolet rays by applying a protective film. On the other hand, as disclosed in Patent Document 1, the ultraviolet blocking function of the polarizing plate is mainly implemented in the protective film of the polarizing plate. In addition, the protective film of the polarizer is designed to block light with a wavelength of about 380 nm or less to protect the polarizer from ultraviolet rays.

On the other hand, in an organic light emitting diode (OLED), as a method of achieving RGB (red, green, blue) colors, applying a color filter to a white OLED light source (white OLED, white OLED, WOLED) or a method of constituting elements that emit RGB colors respectively (RGB method), etc. Among them, the RGB method is beneficial to achieve plastic organic light-emitting diodes (plastic organic light-emitting diodes) in which plastic substrates are used instead of glass substrates for organic light-emitting diodes. OLED, POLED), but there is a problem that it has a shorter lifetime than the WOLED method.

One of the causes of such a problem may include degradation of an organic material constituting especially a blue light source among RGB color light sources due to light having a wavelength of 380 nm or more. Therefore, the polarizing plate applied to POLED needs to have a blocking function for light in the blue region of 380 nm or greater to protect the blue light source of the OLED and prolong the lifetime of the OLED.

As one of the methods of exhibiting the above functions, a method of adding various ultraviolet absorbers to a pressure-sensitive adhesive layer applied to attach an organic light-emitting panel and a polarizing plate is used. However, since there is a problem that yellowing occurs in the pressure-sensitive adhesive layer depending on the type of the ultraviolet absorber and thus the visual appreciation property of the polarizing plate is deteriorated, there is a need for an ultraviolet absorber that can minimize the visual appreciation property of the polarizing plate. Composition for research.

{Prior Technical Literature} {Patent Document}

(Patent Document 1) Korean Registered Patent No. 10-1042477

This application relates to an optical stack and its use.

This application relates to an optical stack. The optical stack of the present application includes an optical film; and a pressure sensitive adhesive layer present on one or both sides of the optical film.

The pressure-sensitive adhesive layer is formed of, for example, a pressure-sensitive adhesive composition. in particular, The pressure sensitive adhesive composition is cured to produce a pressure sensitive adhesive layer. Here, the method of curing the pressure-sensitive adhesive composition is not particularly limited, wherein the pressure-sensitive adhesive composition can be cured by, for example, thermosetting; photocuring, such as ultraviolet radiation; dual curing of heat and light; or moisture curing, etc. Curing method to cure. Therefore, the pressure-sensitive adhesive layer contains at least one cured product of the pressure-sensitive adhesive composition.

In this application, the term "pressure-sensitive adhesive composition" refers to a composition capable of exhibiting properties of a pressure-sensitive adhesive before and/or after the composition is cured, and the meaning of the term "pressure-sensitive adhesive" is well known Known.

The pressure sensitive adhesive composition comprises at least one polymer capable of exhibiting at least pressure sensitive adhesive properties. Here, "pressure-sensitive adhesive polymer" refers to a polymer capable of achieving pressure-sensitive adhesive properties before and/or after its curing and/or crosslinking.

In addition, the pressure-sensitive adhesive composition may contain a pressure-sensitive adhesive polymer as a main component. That is, the pressure-sensitive adhesive composition may contain a ratio of about 50% by weight or more, 55% by weight or more than 55% by weight, 60% by weight or more than 60% by weight, 65% by weight or more than 65% by weight, 70% by weight or more, 75% by weight or more than 75% by weight, 80% by weight or more than 80% by weight, 85% by weight or more than 85% by weight, 90% by weight or more than 90% by weight, or 95% by weight or more 95% by weight pressure sensitive adhesive polymer. In another example, the ratio may be about 100% by weight or less, or about 99% by weight or less.

The type of pressure-sensitive adhesive polymer is not particularly limited, and it can be used without limitation in this application as long as it is capable of exhibiting known pressure-sensitive adhesive functions. A polymer (polymer or the like) will suffice. On the other hand, since this application is about optical stacks, it may be appropriate to choose a polymer as the pressure sensitive adhesive polymer that does not significantly affect the optical properties of the optical stack. For example, the pressure sensitive adhesive polymer can be an acrylic polymer.

In the present application, the term "acrylic acid polymer" may refer to a polymer constituting an esterification product of (meth)acrylic acid or a derivative thereof as a polymerized unit. Here, (meth)acrylic acid refers to acrylic acid or methacrylic acid.

In one example, the acrylic polymer can include polymerized units of an alkyl (meth)acrylate monomer. In addition, the alkyl (meth)acrylate monomer may be represented by Formula 5 below. That is, the acrylic polymer may include polymerized units of monomers of Formula 5 below.

In this application, when any monomer has formed a polymer, the term "polymerized unit" may refer to the backbone formed by the monomer in the polymer.

In Formula 5, Q is hydrogen or an alkyl group, and B is a linear or branched alkyl group. In consideration of cohesive force, glass transition temperature, adhesiveness, etc., B in the above formula 5 may be a linear, branched or cyclic alkyl group having 1 to 14 carbon atoms. In another example, the alkyl group present in B of Formula 5 can be a straight chain, branched chain or cyclic alkanes having 2 to 14, 3 to 14, 4 to 14, 4 to 12 or 4 to 8 carbon atoms base.

In one example, Q in Formula 5 may be an alkyl group. In this case, as the alkyl group present in Q of the above formula 5, an alkyl group having 1 to 20, 1 to 16, 1 to 12, 1 to 8, or 1 to 4 carbon atoms can be used. Alkyl groups can be linear, branched or cyclic. In addition, an alkyl group may be optionally substituted with one or more substituents.

In another example, Q in Formula 5 may be hydrogen.

Considering the cohesion and glass transition temperature of the pressure-sensitive adhesive polymer, an acrylic polymer may be suitable including polymerized units of monomers wherein Q is hydrogen and B is a linear or branched chain having 1 to 14 carbon atoms. alkyl. Examples of monomers of the above formula 5 may include monomer units such as methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, ( n-butyl methacrylate, tertiary butyl (meth)acrylate, second butyl (meth)acrylate, pentyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, (meth)acrylate base) 2-ethylbutyl acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, lauryl (meth)acrylate and/or (meth) ) myristyl acrylate. In this application, the term "(meth)acrylate" is used to refer to either acrylate or methacrylate. Generally, n-butyl acrylate is used as the monomer of formula 5.

In one example, the acrylic polymer may include polymerized units of the monomer of Formula 5 as a main component. That is, the acrylic polymer can be about 50% by weight or greater, 55% by weight or greater, 60% by weight or greater than 60% by weight, based on the sum of the polymerized units of the total monomers in the relevant polymer , 65% by weight or more, 70% by weight or more than 70% by weight, 75% by weight or more than 75% by weight, 80% by weight or more than 80% by weight, 85% by weight or more than 85% by weight, A ratio of 90% by weight or more or 95% by weight or more is included therein. In another example, the ratio may be about 100% by weight or less, or about 99% by weight or less.

The acrylic polymer may further include a polymerized unit of a copolymerizable monomer having a polar group as an additional polymerized unit to improve cohesion and the like.

Here, the copolymerizable monomer having a polar functional group may refer to a monomer that can be copolymerized with other compounds (such as (meth)acrylate compounds) forming an acrylic polymer such as the above formula 5, and may be a side chain or The terminal provides a polar functional group. The polar functional group may be, for example, a functional group capable of reacting with a polyfunctional crosslinking agent described below by applying heat to implement a crosslinked structure or for improving wettability of the pressure-sensitive adhesive layer. The polar functional group can be exemplified by, for example, a hydroxyl group, a carboxyl group or an acid anhydride group thereof, an acid group such as a sulfonic acid group or a phosphoric acid group, a glycidyl group, an amine group, or an isocyanate group, and the like.

The copolymerizable monomer having a polar group may be, for example, a copolymerizable monomer having a hydroxyl group, and specifically, a (meth)acrylate having a hydroxyalkyl group. The copolymerizable monomer having a hydroxyl group includes both a copolymerizable site with other monomers forming an acrylic polymer, and a hydroxyl group, so it may be a monomer capable of providing a hydroxyl group to an acrylic polymer after polymerization.

Copolymerizable monomers having hydroxyl groups can be exemplified by 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate or (meth)acrylic acid 6-hydroxyhexyl ester, etc., but not limited thereto. The use of 4-hydroxybutyl acrylate as a copolymerizable monomer with hydroxyl groups can be more beneficial to improve cohesion and the like.

The ratio between the polymerized units constituting the acrylic polymer is not particularly limited It can be properly adjusted within the range of ensuring proper cohesion and glass transition temperature of the pressure-sensitive adhesive polymer. For example, the acrylic polymer may include polymerized units of a copolymerizable monomer having a polar group in a ratio ranging from about 0.1 parts by weight to about 30 parts by weight based on 100 parts by weight of polymerized units of the monomer of Formula 5 above.

In the present application, unless otherwise specified, the term parts by weight may refer to a weight ratio between components. In another example, the ratio may be about 0.5 parts by weight or greater, 0.7 parts by weight or greater, or 0.9 parts by weight or greater, or may be about 25 parts by weight or less parts, 20 parts by weight or less than 20 parts by weight, 15 parts by weight or less than 15 parts by weight, 10 parts by weight or less than 10 parts by weight, 5 parts by weight or less than 5 parts by weight, or 3 parts by weight or less than 3 parts by weight, but the ratio It can be appropriately changed in consideration of desired cohesive force, wettability, and the like.

In addition to the copolymerizable monomer having a hydroxyl group, the acrylic polymer may include other copolymerizable monomers as copolymerizable monomers having a polar group from the viewpoint of controlling the glass transition temperature of the polymer or imparting other functionality aggregation unit.

Examples of other copolymerizable monomers may include, for example, nitrogen-containing monomers such as (meth)acrylonitrile, (meth)acrylamide, N-methyl(meth)acrylamide, N-vinylpyrrole pyridone, N-vinylcaprolactam or N-butoxymethyl(meth)acrylamide; styrenic monomers such as styrene or methylstyrene; glycidyl (meth)acrylate ; or known comonomers, such as vinyl carboxylates, etc., such as vinyl acetate. Such a polymerized unit may be included in the acrylic polymer at a ratio of, for example, 20 parts by weight or less based on 100 parts by weight of polymerized units of the monomer of Formula 5.

Self-improvement such as pressure-sensitive adhesive polymer cohesion, pressure-sensitive adhesive The physical properties of the acrylic polymer can also be appropriately adjusted from the viewpoint of physical properties such as performance and wettability.

In one example, as the acrylic polymer, a polymer having a weight average molecular weight (Mw) of 800,000 or more may be used.

In the present application, the term "weight average molecular weight" is the conversion value of standard polystyrene measured by gel permeation chromatography (gel permeation chromatography, GPC), wherein in this specification, unless otherwise specified, Otherwise "molecular weight" may refer to "weight average molecular weight". When the molecular weight of the polymer is 800,000 or more, the durability of the pressure-sensitive adhesive can be maintained in an appropriate range. In another example, the molecular weight can be about 850,000 or more than 850,000, 900,000 or more than 900,000, 950,000 or more than 950,000 or 1,000,000 or more than 1,000,000,000, and it can be 2,500,000 or less than 2,500,000, 2,000,000, 1,800,000 or less than 1,800,000, or less than 1,800,000, or less than 1,800,000 or less than 1,800,000. Less than 1,600,000, 1,400,000 or less, 1,200,000 or less, or 1,000,000 or less.

From the viewpoint of ensuring the pressure-sensitive adhesive performance and fluidity of the pressure-sensitive adhesive polymer and improving the embedding properties of steps, when the pressure-sensitive adhesive member having the pressure-sensitive adhesive polymer has been applied to a stepped member, The glass transition temperature (Tg) of the acrylic polymer can also be appropriately adjusted.

In one example, the glass transition temperature of the acrylic polymer can be less than 0°C. In another example, the glass transition temperature may be -10°C or less, -20°C or less, -30°C or less, -40°C or less, -45°C or small At -45°C or -50°C or less than -50°C, and its lower limit is not particularly limited, but it may be -100°C or greater than -100°C, -90°C or greater than -90°C, -80°C or greater than -80°C °C, -70 °C or greater than -70 °C, -60 °C or greater than -60 °C, or -55 °C or greater than -55 °C.

Here, the glass transition temperature of any polymer may be, for example, a value calculated by substituting the glass transition temperature of a homopolymer of monomers constituting the polymer and its formulation weight ratio into the known Fox's equation.

Acrylic polymers can be prepared by known polymerization methods. For example, monomer mixtures obtained by appropriately formulating (meth)acrylate monomers and polar group-containing copolymerizable monomers and/or other comonomers etc. according to desired weight ratios can be applied, for example, to solution polymerization, Conventional polymerization methods such as photopolymerization, bulk polymerization, suspension polymerization or emulsion polymerization to prepare acrylic polymers. In the polymerization process, if necessary, a polymerization initiator, a chain transfer agent, and the like may also be used together.

In one example, from the viewpoint of absorbing ultraviolet rays (for example, ultraviolet rays having a wavelength of 380 nm or more) and imparting a function of blocking ultraviolet rays to the optical laminate, in addition to the pressure-sensitive adhesive polymer, the pressure-sensitive adhesive polymer The sensitive adhesive composition further includes an ultraviolet absorber. Various attempts have been made to ensure the absorption performance of blue light in particular by applying various ultraviolet absorbers to pressure-sensitive adhesive compositions without impairing the visual appreciation properties of the final product, but in improving the visual appreciation properties of the product. There are limitations.

The present inventors have confirmed that the cost can be achieved by applying a specific compound as an ultraviolet absorber applied to a pressure-sensitive adhesive composition, or by applying a combination of a specific compound and another compound to a pressure-sensitive adhesive composition. The purpose of the application , and have drawn the present invention.

In the present application, the term "ultraviolet absorbing power" may refer to the transmittance spectrum of wavelengths, such as at any wavelength in the wavelength range of 10 nm to 450 nm or within the above-mentioned range. Shows minimum transmittance over the entire region or in the absorbance spectrum of wavelengths, for example at any wavelength in the range of wavelengths between 10 nm to 450 nm or over the entire range of wavelengths in the above range The physical property of maximum absorption.

In this application, the term "maximum absorption wavelength" may refer to the wavelength representing the minimum transmittance or maximum absorption.

By including a specific compound, specifically, a malononitrile-based compound as an ultraviolet absorber, the pressure-sensitive adhesive composition can have excellent performance in blocking light having a blue region of 380 nm or more. Therefore, when an optical laminate (for example, a polarizing plate) having a pressure-sensitive adhesive layer formed of a pressure-sensitive adhesive composition is applied to an organic light emitting diode or the like susceptible to light exposure in a blue region, the The lifetime shortening of the blue light source of the OLED is minimized.

In addition, in this application, the pressure-sensitive adhesive composition can make the color of the final product (such as a polarizing plate formed of the pressure-sensitive adhesive composition) by including the following specific malononitrile-based compound as an ultraviolet absorber. The change in value is minimized.

That is, the optical laminate of the present application is designed such that the pressure-sensitive adhesive composition applied to form the pressure-sensitive adhesive layer constituting the optical laminate contains a specific compound as an ultraviolet absorber, so that even when the optical It also ensures excellent durability when the laminate has been exposed to ultraviolet rays, etc., without significantly degrading optical properties properties (eg, visual appreciation properties such as transmittance and chromatic aberration).

As described above, in the present application, a specific compound, specifically, a malononitrile-based compound is included as the ultraviolet absorber used in the pressure-sensitive adhesive composition. Here, the malononitrile-based compound refers to a compound including a derivative of malononitrile (NC≡CC≡N).

In one example, as the malononitrile compound used in the pressure-sensitive adhesive composition, a malononitrile compound having a maximum absorption wavelength within a specific range may also be used. That is, the maximum absorption wavelength of the malononitrile-based compound may be within a specific range. Specifically, the maximum absorption wavelength of the malononitrile compound may be in the ultraviolet range, for example, 10 nm to 450 nm. In another example, the maximum absorption wavelength of the malononitrile compound may be within a range of 340 nm or greater, 350 nm or greater, or 360 nm or greater, and between In the range of 448 nm or less or 446 nm or less.

In this application, a malononitrile compound having a specific structure is applied to a pressure-sensitive adhesive composition. Specifically, in the present application, the ultraviolet absorber used in the pressure-sensitive adhesive composition is a malononitrile compound, specifically, a compound of the following formula 1: [Formula 1]

In Formula 1, R ¹ to R ⁵ are each independently hydrogen, alkyl, -OX ¹ or -NX ¹ ₂ , wherein X ¹ is hydrogen or alkyl, but at least one of R ¹ to R ⁵ is - OX ¹ or -NX ¹ ₂ .

In one example, R ¹ to R ⁵ in Formula 1 may each independently be hydrogen or —OX ¹ , but two or more of R ¹ to R ⁵ are —OX ¹ . In particular, it may be suitable that ^{two of} R1 to R5 are ^-OX1 .

In another example, two of R ¹ to R ⁵ in Formula 1 above may be —OX ¹ or —NX ¹ ₂ . In this case, when any one of R ¹ to R ⁵ in Formula 1 is -OX ¹ or -NX ¹ ₂ , the substituent at the meta position having it may also be -OX ¹ or - NX ¹ ₂ .

In another example, two of R ¹ , R ³ and R ⁵ in Formula 1 above may be —OX ¹ or —NX ¹ ₂ . Specifically, when R ³ in the above formula 1 is -OH, R ¹ or R ⁵ (which is a functional group at the meta position with R ³ ) may be -OX ¹ (wherein X ¹ is an alkyl group), And more specifically, when R ³ in Formula 1 above is —OH, it may be appropriate for R ⁵ to be —OX ¹ (wherein X ¹ is alkyl).

In one example, the pressure-sensitive adhesive composition may also include a malononitrile compound alone, specifically, only the compound of the above formula 1 as an ultraviolet absorber.

In the present application, as the ultraviolet absorber applied to the pressure-sensitive adhesive composition, different types of compounds can also be further combined with the malononitrile of the above formula 1 compounds are included together.

In one example, the pressure-sensitive adhesive composition may further include a pyrazoline-based compound. When the pressure-sensitive adhesive composition further includes a pyrazoline-based compound, the final product designed with the pressure-sensitive adhesive composition can block light in the blue region with a wavelength of 380 nm or greater than 380 nm with better efficiency. light, thereby minimizing the lifetime reduction of the blue light source of the organic light-emitting diode, which is susceptible to blue light irradiation. In addition, when the ultraviolet absorber is mixed as described above, the change in the color value of the final product designed with the pressure-sensitive adhesive composition can be minimized, and its durability can be improved.

In the present application, the pyrazoline-based compound may refer to a compound including a structure derived from pyrazoline, that is, a pyrazoline derivative. Pyrazoline is an unsaturated heterocyclic compound having a molecular formula of C ₃ H ₆ N ₂ .

In the present application, among the pyrazoline-based compounds to be used together with the above-mentioned malononitrile-based compounds, in particular, compounds having a maximum absorption wavelength within a specific range can be used. Specifically, the maximum absorption wavelength of the pyrazoline compound may be in the range of 10 nm to 410 nm. In another example, it may be 100 nm or greater, 200 nm or greater, 300 nm or greater, 350 nm or greater, 360 nm or greater 360 nm, 370 nm or greater, 380 nm or greater, or 385 nm or greater, and may be 405 nm or less or 400 nm or less Meter.

In the present application, the pyrazoline-based compound (which can be formulated into the pressure-sensitive adhesive composition together with the malononitrile-based compound as an ultraviolet absorber) can be represented by the following formula 2:

R ⁶ to R ⁹ in formula 2 are each independently hydrogen, an alkyl group or a substituent of the following formula 3, but at least one of R ⁶ to R ⁹ is a substituent of formula 3:

In Formula 3 above, A may be a single bond, an alkylene group, an alkenylene group, an alkynylene group, -C(=O)O- or -OC(=O)-. In Formula 3 above, R ¹⁰ to R ¹⁴ may each independently be hydrogen, alkyl, alkenyl, alkynyl, aryl, alkoxy, nitro, amino, or hydroxyl. A in Formula 3 above may be bonded to the heterounsaturated ring of Formula 2.

Here, unless otherwise stated, the terms "alkyl", "alkoxy" or "alkylene" may each independently refer to a group having 1 to 20, 1 to 16, 1 to 12, 1 to 8 carbon atoms Or a linear, branched or cyclic alkyl, alkoxy or alkylene group of 1 to 4 carbon atoms. An alkyl, alkoxy or alkylene group may be optionally substituted with one or more substituents.

Here, unless otherwise stated, the terms "alkenyl", "alkenylene", "alkynyl" or "alkynyl" may each independently refer to Straight-chain, branched or cyclic alkenyl, alkenylene, alkynyl or alkynylene of 8 or 2 to 4 carbon atoms. An alkenyl, alkenylene, alkynyl or alkynyl group may be optionally substituted with one or more substituents.

Here, the term "single bond" is a state in which there is no single atom at the corresponding position, and for example, when A is a single bond, an aromatic ring is directly connected to the heterounsaturated ring of Formula 2.

In the above formula 3, A may be a single bond, an alkylene group, an alkenylene group, -C(=O)O- or -OC(=O)-, and specifically, may be a single bond, having 2 to Alkenylene of 6 carbon atoms or alkylene of 2 to 6 carbon atoms.

In the above formula 3, R ¹⁰ to R ¹⁴ may each independently be hydrogen, an alkyl group, an alkenyl group, an alkynyl group, an amino group, or a hydroxyl group. Suitably, R ¹⁰ to R ¹⁴ in Formula 3 above may each independently be hydrogen, alkyl, alkenyl, alkynyl or hydroxyl. Suitably, R ¹⁰ to R ¹⁴ in the above formula 3 may each independently be hydrogen or an alkyl group, wherein the alkyl group may more suitably be a linear or branched chain alkyl group having 1 to 12 carbon atoms.

In one example, at least one of R ⁶ , R ⁷ and R ⁹ in the above formula 2 may be a substituent of the above formula 3. At this time, R ⁸ in the above formula 2 may be hydrogen.

In one example, R ⁶ , R ⁷ and R ⁹ in Formula 2 above may also be substituents in Formula 3. Wherein, when ^R9 in the above formula 2 is a substituent of formula 3, A in formula 3 can be an alkenylene group. Therefore, at this time, in the substituents of formula 3 constituting R ⁶ and R ⁷ , it may be appropriate that A is a single bond.

Here, when R in Formula ² is a substituent of Formula 3 (A in Formula 3 is an alkenyl group), the carbon-carbon or carbon-nitrogen existing in the compound is taken into account. The conjugated site improves the ultraviolet absorbing ability, and A in the above formula 3 may also be a conjugated alkenyl group having 2 to 6 carbon atoms or 2 to 4 carbon atoms.

In another example, as the ultraviolet absorber applied to the pressure-sensitive adhesive composition, other compounds other than the pyrazoline-based compound may be further included together with the malononitrile-based compound of Formula 1 above. Specifically, the pressure-sensitive adhesive composition may further include a malonate-based compound and the above-mentioned malononitrile-based compound of Formula 1 as an ultraviolet absorber. Therefore, the degradation of the visual appreciation property of the final product designed with the pressure-sensitive adhesive composition can be minimized, and when this final product is applied to an organic light emitting diode, especially a plastic organic light emitting diode, its blue Life shortening of the color light source can be minimized.

In the present application, in addition to the malononitrile compound, when the malonate compound is further applied to the pressure-sensitive adhesive composition as an ultraviolet absorber, the maximum absorption wavelength can be used in the malonate compound at a specific Malonic acid compounds in the range. At this time, the maximum absorption wavelength of the malonate-based compound may be in the range of 350 nm to 410 nm. In another example, the wavelength of maximum absorption can be at or above 360 nm, at or above 370 nm, or at or above 380 nm, and can be at or below 405 nm, 400 nm or less, 390 nm or less, or 385 nm or less.

In the present application, the malonate-based compound may refer to a compound including a structure derived from malonate (malonate), that is, a derivative of malonate. Malonic acid is an unsaturated _heterochain compound having the molecular _{formula C3H4O4} .

In one example, the malonate-based compound can be represented by Formula 4 below:

In Formula 4, R ¹⁵ to R ¹⁹ are each independently hydrogen, alkyl, -OX ² or -NX ² ₂ , wherein X ² is hydrogen or alkyl, but at least one of R ¹⁵ to R ¹⁹ is - OX ² or —NX ² ₂ , and R ²⁰ or R ²¹ is hydrogen or alkyl.

In Formula 4, R ¹⁵ to R ¹⁹ may each independently be hydrogen or —NX ² ₂ . In addition, here, at least one of R ¹⁵ to R ¹⁹ may also be -NX ² ₂ . Specifically, R ¹⁷ in Formula 4 is preferably -NX ² ₂ .

In one example, R ¹⁷ in Formula 4 may be -NX ² ₂ , wherein R ¹⁵ to R ¹⁶ and R ¹⁸ to R ¹⁹ in Formula 4 may each independently be hydrogen, alkyl or -OX ² . At this time, in Formula 4 above, both R ²⁰ and R ²¹ may be an alkyl group, and specifically, may be a linear alkyl group having 1 to 4 carbon atoms.

As the alkyl group present in any one of R ¹⁵ to R ¹⁹ in the above formula 4, or any one of R ²⁰ to R ²¹ , there can be used those having 1 to 20, 1 to 16, 1 to 12, An alkyl group of 1 to 8 or 1 to 4 carbon atoms.

In the present application, the content of the ultraviolet absorber applied to the pressure-sensitive adhesive composition may be adjusted in consideration of the purpose of the present application. The pressure sensitive adhesive composition may include the ultraviolet absorber in a ratio of 0.01 to 10 parts by weight based on 100 parts by weight of the pressure sensitive adhesive polymer. In another example, the ratio may be 0.1 parts by weight or more, 0.5 parts by weight or more, 1 part by weight or more, or 1.5 parts by weight or more, and may be 9 parts by weight or less, 7 parts by weight or less than 7 parts by weight, or 5 parts by weight or less than 5 parts by weight. Here, when the malononitrile compound is used alone in the pressure-sensitive adhesive composition as an ultraviolet absorber, the ratio of the ultraviolet absorber may refer to the ratio of a single compound, and when the malononitrile compound and the malonate or pyrazole When the morphine compound is used together, it may also refer to the total content of the applied ultraviolet absorber.

In another example, the ratio of the malononitrile compound in the pressure sensitive adhesive composition can be adjusted independently. Specifically, based on 100 parts by weight of the pressure-sensitive adhesive polymer, the pressure-sensitive adhesive composition may include the malononitrile compound of the above formula 1 in a ratio ranging from 0.01 parts by weight to 10 parts by weight. In another example, the ratio may be 0.1 parts by weight or more, 0.5 parts by weight or more, 1 part by weight or more, or 2 parts by weight or more, and may be 9 parts by weight or less than 9 parts by weight, 8 parts by weight or less than 8 parts by weight, 7 parts by weight or less than 7 parts by weight, 6 parts by weight or less than 6 parts by weight, 5 parts by weight or less than 5 parts by weight, or 4.5 parts by weight or less 4.5 parts by weight.

At this time, when the pressure-sensitive adhesive composition further includes a pyrazoline compound and acrylic In the case of a dinitrile-based compound, the ratio of the pyrazoline-based compound to the ratio of the malononitrile-based compound can also be adjusted independently. Specifically, based on 100 parts by weight of the malononitrile compound, the ratio of the pyrazoline compound may range from 1 part by weight to 30 parts by weight. In another example, the ratio may be 2 parts by weight or more, 3 parts by weight or more, 4 parts by weight or more, 5 parts by weight or more, or 6 parts by weight Or greater than 6 parts by weight, and can be 29 parts by weight or less than 29 parts by weight, 28 parts by weight or less than 28 parts by weight, 27 parts by weight or less than 27 parts by weight, 26 parts by weight or less than 26 parts by weight, 25 parts by weight or less 25 parts by weight, 24 parts by weight or less than 24 parts by weight, 23 parts by weight or less than 23 parts by weight, 22 parts by weight or less than 22 parts by weight, 21 parts by weight or less than 21 parts by weight or 20 parts by weight or less than 20 parts by weight.

In another example, when the pressure-sensitive adhesive composition further includes a malonate-based compound and a malononitrile-based compound, the ratio of the malonate-based compound to the ratio of the malononitrile-based compound can also be adjusted independently. Specifically, based on 100 parts by weight of the malononitrile compound, the ratio of the malonate compound may range from 10 parts by weight to 90 parts by weight. In another example, the ratio may be 15 parts by weight or greater, 20 parts by weight or greater, 30 parts by weight or greater, 31 parts by weight or greater, 32 parts by weight Or more than 32 parts by weight or 33 parts by weight or more than 33 parts by weight, and can be 85 parts by weight or less than 85 parts by weight, 80 parts by weight or less than 80 parts by weight, 75 parts by weight or less than 75 parts by weight, 70 parts by weight or less 70 parts by weight, 69 parts by weight or less than 69 parts by weight, 68 parts by weight or less than 68 parts by weight, or 67 parts by weight or less than 67 parts by weight.

The pressure-sensitive adhesive composition may further include a crosslinking agent. The crosslinking agent can be a multifunctional crosslinking agent. For example, the cross-linking agent can react with the pressure-sensitive adhesive polymer by applying heat to form a cross-linking structure. In one example, in the pressure-sensitive adhesive layer including the cured product of the pressure-sensitive adhesive composition, the pressure-sensitive adhesive polymer may exist in a state of being cross-linked by a cross-linking agent.

As the crosslinking agent, for example, a crosslinking agent such as an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent, and a metal chelate crosslinking agent may be used, but is not limited thereto. As the isocyanate crosslinking agent, polyfunctional isocyanate compounds such as toluene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoboron diisocyanate, tetramethylxylene diisocyanate Or a compound obtained by reacting a polyfunctional isocyanate compound with a polyol compound such as trimethylolpropane; as an epoxy crosslinking agent, it may be selected from ethylene glycol diglycidyl ether, triglycidyl ether, trimethylolpropane, etc. One or more of the group consisting of hydroxymethylpropane triglycidyl triglycidyl ether, N,N,N',N'-tetraglycidyl ethylenediamine and glycerol diglycidyl ether; and as aziridine Pyridine cross-linking agent, can for example be selected from N,N'-toluene-2,4-bis(1-aziridine carboxamide), N,N'-diphenylmethane-4,4'-bis( 1-Aziridine Formamide), Triethylenemelamine, Bisisoprothaloyl-1-(2-methylaziridine) (bisisoprothaloyl-1-(2-methyl aziridine)) and Tris-1-Aziridine One or more of the group consisting of pyridyl phosphine oxides, but not limited thereto. In addition, the metal chelate crosslinking agent can be exemplified as one in which polyvalent metals such as aluminum, iron, zinc, tin, titanium, antimony, magnesium, and/or vanadium are coordinated with acetylacetone or ethyl acetylacetate, etc. compounds, but not limited to them.

Based on 100 parts by weight of the pressure-sensitive adhesive polymer, the composition of the pressure-sensitive adhesive The compound may include, for example, a crosslinking agent in a ratio of 0.01 to 10 parts by weight, but is not limited thereto. The ratio may be appropriately changed in consideration of cohesion or durability of the pressure-sensitive adhesive, or the like. For example, in another example, the ratio may be about 9 parts by weight or less, 8 parts by weight or less, 7 parts by weight or less, 6 parts by weight or less, 5 parts by weight or less than 5 parts by weight, 4 parts by weight or less than 4 parts by weight, 3 parts by weight or less than 3 parts by weight, 2 parts by weight or less than 2 parts by weight, 1 part by weight or less than 1 part by weight, 0.5 parts by weight or less 0.5 parts by weight or 0.1 parts by weight or less than 0.1 parts by weight, or 0.05 parts by weight or more than 0.05 parts by weight.

In order to prevent yellowing and the like, in addition to the components, a group selected from antioxidants, ultraviolet stabilizers, heat stabilizers, plasticizers, antistatic agents, fillers, defoamers, One or more additives in the group consisting of surfactant, nucleating agent, flame retardant, weather-resistant stabilizer, lubricant and release agent, so that the purpose of the present invention can be achieved.

The pressure-sensitive adhesive composition may further include a solvent. Solvents may include aromatic hydrocarbons such as toluene, benzene, and xylene; aliphatic hydrocarbons such as cyclohexane and decahydronaphthalene; esters such as ethyl acetate and butyl acetate; ketones such as acetone, methyl ethyl ketone, and methyl isobutyl Alcohols, such as methanol, ethanol, isopropanol, butanol, isobutanol, methyl cellosolve, ethyl cellosolve and butyl cellosolve; ethers, such as tetrahydrofuran and dioxane; halogenated hydrocarbons, For example, dichloromethane, chloroform, and carbon tetrachloride; dimethylformamide; dimethylsulfoxide, etc. These solvents may be used alone or in combination of two or more.

In this application, the pressure-sensitive adhesive composition can have more significant effect effect, especially when the optical stack is a polarizer. Specifically, when the optical film is a polarizer, the optical laminate may be a polarizing plate, and in particular, it may be important to apply a pressure-sensitive adhesive layer composed of a pressure-sensitive adhesive composition. Hereinafter, optical laminates and polarizing plates can also be used in the same sense.

In this application, the term "polarizer" means a film, sheet or element having a polarizing function. A polarizer is a functional element capable of extracting light vibrating in one direction from incident light vibrating in various directions.

The polarizer can be an absorbing polarizer. In this application, the term "absorbing polarizer" means an optical element that exhibits selective transmission and absorption properties for incident light. The absorbing polarizer can transmit light vibrating in one direction and absorb light vibrating in other directions among incident light vibrating in various directions.

The polarizer may be a linear polarizer. In this application, the term "linear polarizer" means a linearly polarized light in which the selectively transmitted light vibrates in either direction, and the selectively absorbed light is linearly polarized in the normal direction of vibration of the linearly polarized light. A polarizer that oscillates linearly polarized light in the cross direction.

As the polarizer, for example, a polarizer in which iodine is dyed on a polymer stretched film such as a polyvinyl alcohol (polyvinyl alcohol, PVA) stretched film or the like is used as a host, or in which a liquid crystal polymerized in an aligned state is used, And an anisotropic dye aligned according to the alignment of liquid crystals is used as a guest-host polarizer of the guest, but is not limited thereto. That is, the polarizer may contain a polyvinyl alcohol-based compound.

Considering the purpose of this application, the transmittance and polarization degree of the polarizer can be adjusted appropriately. For example, the transmittance of the polarizer can be 42.5% to 55%, and the degree of polarization can be 65% to 99.9997%.

In consideration of the purpose of the present application, the thickness of the pressure-sensitive adhesive layer can be appropriately adjusted. The pressure-sensitive adhesive layer may have a thickness of, for example, about 1 micron to 30 microns. The thickness of the pressure-sensitive adhesive layer may specifically be 1 micron or more, 3 microns or more, or 5 microns or more, and may be 25 microns or less, 20 microns or less, or 15 microns. microns or less than 15 microns. Within this thickness range, it may be advantageous to provide an optical laminate excellent in blocking efficacy of ultraviolet rays including a blue region, color characteristics of a polarizing plate, and durability in reliability evaluation.

The pressure-sensitive adhesive layer may have an excellent property of blocking ultraviolet rays including a blue region of 380 nm or more. The pressure sensitive adhesive layer may have a transmittance of less than 3% for light in a wavelength range of, for example, 380 nm or greater to 400 nm or less. For example, the pressure sensitive adhesive layer may have a transmittance of less than 20% for light in a wavelength range of, for example, greater than 400 nm to 410 nm or less than 410 nm. In this application, the term "transmittance within a specific wavelength range" may be the transmittance to any specific wavelength within the wavelength range, may be the transmittance to certain wavelength ranges within the range, or Transmittance for all wavelengths within the range may be meant.

The optical stack of the present application may have an excellent property of blocking ultraviolet rays including a blue region of 380 nm or more. Specifically, the optical stack can have a transmission of 1% or less over a wavelength range of, for example, 380 nm or greater to 400 nm or less.

For example, the optical stack can have a transmission of 10% or less in the wavelength range of greater than 400 nm to 410 nm or less than 410 nm. For example, the optical stack can have a transmission of 1% or less, 0.5% or less, 0.1% or less, or 0.05% or less for light having a wavelength of 380 nm. For example, the optical stack may have 1% or less, 0.5% or less, 0.2% or less, 0.15% or less, 0.15% or less, 0.10% or less, or 0.06% or less than 0.06% transmittance. For example, the optical stack may have a transmission of 1% or less, or 0.95% or less, for light having a wavelength of 400 nanometers. For example, the optical stack can have a transmission of 10% or less, 8% or less, or 7% or less for light having a wavelength of 410 nanometers.

Optical stacks can have excellent color properties. For example, the b* value of the optical stack in the CIE Lab color coordinate system can be 7.5 or less, 7 or less, 6.5 or less 6.5, 6.0 or less 6.0, 5.9 or less , 5.8 or less than 5.8 or 5.7 or less than 5.7. Additionally, the optical stack can have an a* value of -3.9 or greater, -3.5 or greater, -3.0 or greater, or -2.8 or greater, eg, in the CIE laboratory color coordinate system.

The a*b* color coordinate system may mean a* color coordinates and b* color coordinates of a color coordinate system called L*a*b*. The laboratory coordinate system is a color coordinate system based on the chromaticity diagram of the International Commission on Illumination (Commission Internaltion de L'Eclairage, C.I.E.), which is based on the luminance element (L*) and two color axes (a* axis and b* axis) to display the coordinate system of the color. In the L*a*b* coordinate system, the a* axis is a two-color axis of green and red, and the b* axis is a two-color axis of blue and yellow. The higher the b* value, the color of the polarizer The color is closer to yellow. At this time, if the b* value is too high, the degree of yellowing of the polarizing plate becomes severe, and thus there may be a problem even in visual appreciation of the entire product. The lower limit of the b* value may be, for example, 1.0 or more, 1.5 or more, 2.0 or more, 2.5 or more, 3.0 or more, or 3.3 or more. The upper limit of the value of a* can be, for example, less than 0, -0.5 or less than -0.5, -1.0 or less than -1.0 or -1.4 or less than -1.4. Considering the type of products to which the polarizing plate is applied, the needs of customers, etc., the color value required by the polarizing plate can be adjusted appropriately, but in view of not causing problems in the visual appreciation of the product, for example, around 3.0 to 7.0 or 3.0 to A b* value around 5.3 may be suitable.

In the present application, by formulating the above-mentioned malononitrile compound of formula 1 as an ultraviolet absorber alone into the pressure-sensitive adhesive composition, or combining the above-mentioned malononitrile compound and formula 2 The pyrazoline compound or the malonate compound of the above formula 4 is mixed and the mixture is formulated into a pressure-sensitive adhesive composition, and the polarizing plate thus formed can effectively block light in the blue region, and at the same time exhibit excellent The optical properties are because the b* value of the polarizer will not deviate significantly from the above range.

Each value in the CIE L*a*b* color coordinate system can be measured by applying the general method of measuring each coordinate of the color coordinate system, for example, it is possible to place a detector in the form of an integrating sphere at the measurement position After measuring the instrument (for example, ultraviolet-visible spectrometer), measure according to the manufacturer's manual. In one example, each coordinate of the CIE L*a*b* color space can also be measured relative to the optical stack itself.

Optical stacks can have excellent durability. In one example, the optical laminate may not cause pressure-sensitive adhesive in a high-temperature reliability evaluation at a temperature of 80°C or when it is stored for 1000 hours at a temperature of 60°C and a relative humidity of 90%. Lifting at the layer interface.

In an optical stack, the pressure sensitive adhesive layer may directly contact the optical film, or there may be another layer between the pressure sensitive adhesive layer and the optical film.

In one example, when the optical film is a polarizer, the optical stack may further include a retardation layer. The retardation layer may have a function of converting circularly polarized light into linearly polarized light or converting linearly polarized light into circularly polarized light.

The retardation layer may have in-plane retardation for light of 550 nm having a wavelength in the range of 100 nm to 180 nm. Here, when the in-plane retardation of the retardation layer is within the above range, it can also be said that the retardation film has 1/4 wavelength phase retardation characteristics.

In the present application, the term "n-wavelength phase retardation characteristic" refers to a characteristic capable of retarding the phase of incident light by n times the wavelength of the incident light within at least a part of the wavelength range. That is, the 1/4 wavelength phase retardation characteristic can convert incident linearly polarized light into elliptically polarized light or circularly polarized light, and convert reversely incident elliptically polarized light or circularly polarized light into linearly polarized light characteristics. That is, the in-plane retardation of the retardation layer for light having a wavelength of 550 nm may be within the above range, which may be calculated according to Equation 1 to be described below. In another example, the in-plane retardation of the retardation film may be 105 nm or greater, 110 nm or greater, 115 nm or greater, 120 nm or greater, 125 nm or greater or 130 nm or greater and may be 290 nm or less, 280 nm or less, 270 nm or less, 260 nm m or less than 260 nm, 250 nm or less, 240 nm or less 240 nm, 230 nm or less, 220 nm or less, 210 nm or less, 200 nm or less, 190 nm or less, 180 nm 180 nm or less, 170 nm or less, 160 nm or less, 150 nm or less, or 145 nm or less.

In this application, the term "plane retardation (R _in )" is a value determined according to Equation 1 below. On the other hand, the slow axis of the retardation layer may be about 40 to 50 degrees, about 43 to 47 degrees, and preferably about 45 degrees to the absorption axis of the polarizer. For example, the retardation layer may be a polymer stretched film or a solidified layer of a liquid crystal compound.

[Equation 1] Rin=d×(nx-ny).

In Equation 1, d is the thickness of the retardation layer, and nx, ny, and nz represent the refractive index of the retardation layer in x-axis, y-axis, and z-axis directions, respectively. The x-axis means the direction parallel to the planar slow axis of the retardation layer, the y-axis means the direction parallel to the planar fast axis of the retardation layer, and the z-axis means the thickness direction of the retardation layer. The slow axis direction refers to the direction having the largest refractive index on the plane, the fast axis direction refers to the direction perpendicular to the slow axis on the plane of the retardation layer, and the thickness direction refers to the normal direction of the plane formed by the slow axis and the fast axis. In this application, unless otherwise stated, the term "refractive index" refers to the refractive index of light having a wavelength of about 550 nm.

The retardation layer may be a functional layer having so-called reverse wavelength dispersion characteristics. In the present application, the term "reverse wavelength dispersion characteristic" may refer to a characteristic satisfying Equation 2 below: [Equation 2] R(450)/R(550)<R(650)/R(550).

In Equation 2, R(450) is the in-plane retardation of the retardation layer for light with a wavelength of 450 nm, R(550) is the in-plane retardation of the retardation layer for light with a wavelength of 550 nm, and R(650) is the in-plane retardation of the retardation layer to light with a wavelength of 650 nm.

The in-plane retardations of the retardation layers can each be calculated according to Equation 1 above. However, in the in-plane retardation of light with a wavelength of 450 nm, the refractive indices of light with a wavelength of 450 nm are applied as nx and ny in Equation 1; in the in-plane retardation of light with a wavelength of 550 nm , the refractive index of light with a wavelength of 550 nm is applied as nx and ny in Equation 1; and in the in-plane retardation of light with a wavelength of 650 nm, the refractive index of light with a wavelength of 650 nm is given in Equation 1 Applied as nx and ny.

The retardation layer satisfying Equation 2 above can exhibit phase retardation characteristics engineered over a wide wavelength range. Better effects can be provided by adjusting R(450)/R(550) and/or R(650)/R(550) in the above formula 2 in the retardation layer.

In one example, R(450)/R(550) in Equation 4 above may be in the range of 0.6 to 0.99. In another example, R(450)/R(550) can be 0.61 or greater than 0.61, 0.62 or greater than 0.62, 0.63 or greater than 0.63, 0.64 or greater than 0.64, 0.65 or greater than 0.65, 0.66 or greater than 0.66, 0.67 or greater 0.67, 0.69 or more, 0.69, 0.70 or more, 0.71 or more 0.78, 0.79 or greater than 0.79, 0.80 or greater than 0.80, 0.81 or greater than 0.81, 0.82 or greater than 0.82, 0.83 or greater 0.83, 0.84 or greater than 0.84, 0.85 or greater than 0.85, 0.86 or greater than 0.86, 0.87 or greater than 0.87, 0.88 or greater than 0.88, 0.89 or greater than 0.89, or 0.90 or greater than 0.90. In another example, R(450)/R(550) may be 0.98 or less than 0.98, 0.97 or less than 0.97, 0.96 or less than 0.96, 0.95 or less than 0.95, 0.94 or less than 0.94, 0.93 or less than 0.93, 0.92 or less 0.92, 0.91 or less than 0.91, 0.90 or less than 0.90, 0.89 or less than 0.89, 0.88 or less than 0.88 or 0.87 or less than 0.87, 0.86 or less than 0.86 or 0.85 or less. R(650)/R(550) in Equation 4 may range from 1.00 to 1.19. R(650)/R(550) can be 1.18 or less than 1.18, 1.17 or less than 1.17, 1.16 or less than 1.16, 1.15 or less than 1.15, 1.14 or less than 1.14, 1.13 or less than 1.13, 1.12 or less than 1.12, 1.11 or less , 1.1 or less than 1.1 or 1.08 or less than 1.08. In another example, R(650)/R(550) may be 1.01 or greater than 1.01, 1.02 or greater than 1.02, 1.03 or greater than 1.03, 1.04 or greater than 1.04, 1.05 or greater than 1.05, 1.06 or greater than 1.06, 1.07 or greater 1.07, 1.08 or greater than 1.08 or 1.09 or greater than 1.09.

The way of adjusting the physical properties of the retardation layer within the above range is not particularly limited. For example, when a retardation film is produced using a polymerizable liquid crystal composition, it can also be controlled by adjusting the type and ratio of the polymerizable liquid crystal compound contained in the polymerizable liquid crystal composition, or by adjusting the retardation film to control the thickness.

In order to ensure the above-mentioned retardation characteristics, it may be advantageous to apply a liquid crystal polymer layer or a cured layer of a polymerizable liquid crystal composition as a retardation layer, and in particular, to apply a polymerizable liquid crystal composition comprising a polymerizable liquid crystal compound having a specific reverse wavelength characteristic material A cured layer may be advantageous. In addition, when such a polymerizable liquid crystal composition is used, the optical laminate of the present application can be made to ensure the desired ultraviolet blocking properties even if the ultraviolet absorber and light stabilizer are not included as required.

When the optical stack further includes a retardation layer, a pressure-sensitive adhesive layer may exist between the polarizer and the retardation layer or on the outside of the retardation layer. However, in consideration of defects in the manufacturing process of organic light-emitting devices to be described below, it is appropriate that an adhesive layer to be described below exists between the polarizer and the retardation layer, and a pressure-sensitive adhesive layer exist on the outer side of the retardation layer. .

In the present application, the term "outside of the retardation layer" may refer to a position on the opposite side based on the polarizer side of the retardation layer, which may include a position directly contacting the retardation layer or a position not directly contacting the retardation layer. In the present application, the term "outer side of the polarizer" may refer to a position on the opposite side based on the retardation layer side of the polarizer, which may include a position directly contacting the polarizer or a position not directly contacting the polarizer. That is, in chemical lamination, it may be desirable for the retardation layer to be present on the opposite side of the pressure-sensitive adhesive layer based on an optical film (eg, polarizer).

In the present application, the term "adhesive layer" may refer to a layer that cannot be reattached once it is attached to an adherend and removed once because it maintains a solid state after being fully cured. Here, the adhesive layer can be formed by, for example, applying the adhesive composition to one side of the polarizer, and curing it by drying, heating, or irradiating with electromagnetic waves, or the like. Here, the term "curing of the adhesive composition" may refer to a process of making the adhesive composition express adhesive properties through physical action or chemical reaction.

The adhesive layer may refer to a layer formed of an adhesive composition. In addition, the binder group The finished product may contain a binder as a main component, and components for the main component are as described above. The specific kind of material that can be used as the adhesive is not particularly limited as long as it is cured to express the desired adhesive properties. As the adhesive, for example, one or two or more of the following can be used: polyvinyl alcohol-based adhesives; acrylic adhesives; vinyl acetate-based adhesives; urethane-based adhesives; Adhesives; polyolefin adhesives; polyvinyl alkyl ether adhesives; rubber adhesives; vinyl chloride-vinyl acetate adhesives; styrene-butadiene-styrene (styrene-butadiene-styrene, SBS) adhesives; hydrogenated styrene-butadiene-styrene products (hydrogenated styrene-butadiene-styrene product, SEBS) adhesives; vinyl adhesives; and acrylate adhesives, etc. Such adhesive layers can be prepared by curing, for example, water-based, solvent-based or solvent-free adhesive compositions. In addition, the adhesive layer may comprise a thermosetting, room temperature curing, moisture curing or light curable adhesive composition in a cured state. In addition, preferable examples of the adhesive layer may include an adhesive layer comprising a water-based polyvinyl alcohol-based adhesive composition; a solvent-free acrylic adhesive composition; or a solvent-free vinyl acetate-based adhesive composition in a cured state, or the like.

When the optical film is a polarizer, the optical stack of the present application can be a polarizer. In the polarizing plate, as shown in FIG. 1, an adhesive layer (30) may exist between the polarizer (10) and the retardation layer (20), and a pressure-sensitive adhesive layer (40) may exist between the retardation layer (20). on the outside. In the polarizing plate according to the structure of FIG. 1 , an intermediate layer to be described below, such as a polarizer protective film, a retardation film other than the retardation layer, or a base of the retardation film may or may not be included between the adhesive layer and the polarizer. film etc. According to this structure, It can protect the liquid crystal alignment film included in the polarizing plate from additional ultraviolet rays, and thus is advantageous. When a liquid crystal film (cured layer of a liquid crystal compound) is used as a retardation layer, a liquid crystal alignment film can be used.

In addition to the retardation layer, the polarizing plate may further include additional layers.

In one example, the polarizing plate may further include one or more upper layers outside the polarizer, a lower layer outside the retardation layer, and an intermediate layer between the polarizer and the retardation layer. The pressure-sensitive adhesive layer may be present at one or more of positions between the polarizer and the upper layer, between the polarizer and the middle layer, between the retardation layer and the middle layer, between the retardation layer and the lower layer, and at positions outside the retardation layer . However, considering the defects in the manufacturing process of the organic light-emitting device described below, the adhesive layer exists between the polarizer and the upper layer, between the polarizer and the intermediate layer, between the retardation layer and the intermediate layer, and between the retardation layer and the lower layer. Between is suitable, and the pressure-sensitive adhesive layer is present on the outside of the retardation layer.

As shown in FIG. 2, the upper layer (103) may be laminated on the opposite side of the polarizer (101) facing the retardation layer (102). In this case, the pressure-sensitive adhesive layer may exist at one or more of positions between the upper layer and the polarizer, between the polarizer and the retardation layer, and positions outside the retardation layer. However, in consideration of defects in the manufacturing process of organic light-emitting devices to be described below, it is appropriate for the adhesive layer to exist at one or more of the positions between the upper layer and the polarizer and between the polarizer and the retardation layer. , and the pressure-sensitive adhesive layer exists outside the retardation layer.

As the type of the upper layer, a protective film of a polarizer, a hard coat layer, a retardation film other than a retardation layer, an antireflection layer, or a liquid crystal coating, etc. are exemplified, but not limited thereto. The specific type of each structure used as the upper layer is not particularly limited, for example, unlimited Various films used in industry to constitute optical films such as polarizing plates are systematically used. The upper layer may be a single layer of the illustrated layers, or may have a multi-layered structure including a laminated structure of two or more of the illustrated layers.

As shown in FIG. 3, the lower layer (203) may be laminated on the opposite side of the surface of the retardation layer (202) facing the polarizer (201). In this case, the pressure-sensitive adhesive layer may exist at one or more of positions between the lower layer and the retardation layer, between the polarizer and the retardation layer, and positions outside the retardation layer. However, in consideration of defects in the manufacturing process of organic light-emitting devices to be described below, it is appropriate for the adhesive layer to exist at one or more of the positions between the lower layer and the retardation layer and between the polarizer and the retardation layer. , and the pressure-sensitive adhesive layer exists outside the retardation layer. In the case of Figure 3, an upper layer can be added as shown in Figure 2. For example, as shown in FIG. 3, in the state where the lower layer exists, an upper layer such as a hard coat layer or a low reflection layer may exist on the outer side of the polarizer, and a protective film may also exist on one or both sides of the polarizer. .

As the type of the lower layer, a pressure-sensitive adhesive layer or an adhesive layer for attaching a retardation film or a polarizing plate other than a retardation film to another element, an adhesive layer, or a pressure-sensitive adhesive layer or an adhesive layer for protecting protective film or release film. In this case, the pressure-sensitive adhesive layer as the lower layer may also be the above-mentioned pressure-sensitive adhesive layer of the present application. The lower layer may be a single layer of the illustrated layers, or may have a multi-layered structure including a laminated structure of two or more of the illustrated layers.

As shown in FIG. 4, an intermediate layer (303) may exist between the polarizer (301) and the retardation layer (302). In this case, the pressure-sensitive adhesive layer may exist in positions between the intermediate layer and the polarizer, between the intermediate layer and the retardation layer, and outside the retardation layer. at one or more locations. However, in consideration of defects in the manufacturing process of organic light-emitting devices to be described below, it is appropriate for the adhesive layer to exist at one or more of the positions between the intermediate layer and the polarizer and between the intermediate layer and the retardation layer. , and the pressure-sensitive adhesive layer exists outside the retardation layer. Although not shown in the structure of FIG. 4, the upper layer in the structure of FIG. 2 and/or the lower layer in the structure of FIG. 3 may also be present.

As the intermediate layer, the above-mentioned polarizer protective film, a retardation film other than the retardation layer, or a base film of the retardation layer may be exemplified. The intermediate layer may be a single layer of the illustrated layers, or may have a multilayer structure including a stacked structure of two or more of the illustrated layers.

As a protective film of a polarizer or a base film of a retardation layer, for example, a cellulose film such as a triacetyl cellulose (TAC) film; a polyester film such as poly(ethylene terephthalate); Poly(ethylene terephthalate), PET) film; polycarbonate film; polyether film; acrylic film and/or polyolefin film, such as polyethylene film, polypropylene film, containing ring or norbornene structure Polyolefin film or ethylene-propylene copolymer film, etc., but not limited thereto.

As the retardation film other than the retardation layer, a retardation film having a positive thickness direction retardation value can be exemplified. In the present application, the term "thickness direction retardation (Rth)" may be a value determined according to Equation 3 below. When the polarizing plate further includes a retardation film having a positive retardation value in the thickness direction, it may have excellent anti-reflection characteristics and color characteristics at viewing angles. As the retardation film, a retardation film satisfying Equation 4 or Equation 5 below may be used. A retardation film satisfying Equation 4 below may be referred to as a +C plate, and a retardation film satisfying Equation 5 below may be referred to as a +B plate. Such a retardation film can be, for example, a polymer stretched film, a vertically aligned liquid crystal layer, an obliquely aligned liquid crystal layer, or an obliquely aligned liquid crystal layer, etc., but is not limited to this. In one example, the projection of the optical axis (slow axis) of the retardation film on a plane may be parallel or orthogonal to the absorption axis of the polarizer.

[Equation 3] Rth=d×(nz-ny)

[Equation 4] nx=ny<nz

[Equation 5] nx>ny and nz>ny

In Equation 3, d is the thickness of the retardation layer, and in Equations 3 to 5, nx, ny, and nz are each as defined above.

5 and 6 each illustratively show the structure of a polarizing plate according to one example of the present application. The polarizing plate according to FIG. 5 may sequentially include a hard coat layer (403), a polarizer (401), a polarizer protective film (404), an adhesive layer (405), a retardation layer base film (406), and a retardation layer (402). , +C plate (407) and pressure sensitive adhesive layer (408). The polarizing plate according to FIG. 6 may sequentially include a hard coat layer (403), a polarizer (401), an adhesive layer (405), a retardation layer base film (406), a retardation layer (402), a +C plate (407) and A pressure sensitive adhesive layer (408).

The present application is also related to organic light emitting devices. An organic light emitting device may include an optical stack and an organic light emitting panel. When the optical stack is a polarizing plate and the polarizing plate includes a retardation layer, the retardation layer may be disposed adjacent to the organic light emitting panel.

In organic light emitting devices, the optical stack can be attached to the organic light emitting panel via a pressure sensitive adhesive layer. That is, in organic light-emitting devices, the optical film can be The composite layer is attached to the organic light emitting panel.

In addition, since the optical stack is attached to the organic light-emitting panel through the pressure-sensitive adhesive layer, when a defect occurs during the manufacturing process of the organic light-emitting device, a relatively low-cost optical stack is removed and another optical stack is re- It can also solve the problem of discarding expensive organic light-emitting panels when defects occur during the manufacturing process.

In one example, the organic light-emitting panel may include a substrate; and a first electrode layer sequentially disposed on a first surface of the substrate; an organic light-emitting layer; and a second electrode layer, wherein the optical stack can be located from the The organic light-emitting panel emits light on one side.

For example, as described below, when an organic light emitting device has a bottom emission structure in which light is emitted toward a substrate, an optical stack (eg, a polarizing plate) may be disposed outside the substrate. Also, when the organic light emitting device has a top emission structure in which light is emitted toward an encapsulation substrate to be explained below, the optical stack may be disposed outside the encapsulation substrate. The polarizing plate can improve visibility of the organic light emitting device by preventing external light from being reflected by a reflective layer made of metal, such as electrodes and wiring of the organic light emitting device, and emitted from the organic light emitting device.

FIG. 7 illustratively shows the structure of the organic light emitting device of the present application. When the optical stack is a polarizing plate, as shown in FIG. 7, the organic light-emitting device may include a substrate (701), a first electrode layer (702), an organic light-emitting layer (703) sequentially arranged on the first surface of the substrate ) and the second electrode layer (704), and the polarizer (100) may be included on the second surface of the substrate.

The optical stack of the present application is particularly suitable for plastic organic light-emitting devices. because Therefore, the substrate of the organic light emitting device may be a plastic substrate. Organic light emitting devices comprising plastic substrates may be advantageous in the implementation of rollable, flexible or bendable organic light emitting devices.

The plastic substrate may contain polymers. The polymer may be exemplified by polyimide, polyamic acid, polyethylene naphthalate, polyether ether ketone, polycarbonate, polyethylene terephthalate, polyether sulfide , Polymer or acrylic polymer etc. In one example, the plastic substrate may include polyimide which has excellent high temperature durability in terms of process temperature.

As the substrate, a translucent substrate can be used. The translucent substrate may have a transmittance of, for example, 50% or more, 60% or more, 70% or more, or 80% for light in the visible region.

One of the first electrode layer and the second electrode layer may be an anode, and the other may be a cathode. The anode is a hole-injecting electrode, which may be made of a conductive material with a high work function, and the cathode is an electron-injecting electrode, which may be made of a conductive material with a low work function. In one example, the first electrode layer can be an anode, and the second electrode layer can be a cathode.

The anode can be a transparent electrode, and the cathode can be a reflective electrode. The anode may comprise a transparent metal oxide, for example, ITO, IZO, AZO, GZO, ATO, or _SnO2 , among others. The cathode may comprise metals such as Ag, Au, Al, and the like.

The organic light emitting layer may include an organic material capable of emitting light when power has been applied to the first electrode layer and the second electrode layer. In a structure called a so-called bottom emission device, the first electrode layer may be formed of a transparent electrode layer, and the second electrode layer may be formed of a reverse electrode layer. The emitter layer is formed. Furthermore, in a structure called a so-called top emission device, the first electrode layer is formed of a reflective electrode layer, and the second electrode layer is formed of a transparent electrode layer. Electrons and holes injected from the electrode layer can be recombined in the organic light-emitting layer to generate light. Light may be emitted toward the substrate in bottom emission devices, and toward the second electrode layer in top emission devices.

The organic emission layer may include a red emission layer, a green emission layer, and a blue emission layer. The emissive layer may include known organic materials that emit red, green, and blue colors, respectively. In one example, the organic light emitting device may be driven by a method (RGB method) in which three primary color light emitting layers respectively emit different colors while forming one pixel (a dot, a picture element), or may be driven by the following method ( WOLED method) to drive: one pixel is formed by laminating the three primary color light-emitting layers to emit white, and then various colors are implemented by providing a color filter layer on top of the white light-emitting layer.

The organic light emitting panel may further include sublayers located between the first electrode layer and the organic light emitting layer and between the second electrode layer and the organic light emitting layer. The sublayer may include a hole transport layer, a hole injection layer, an electron injection layer, and an electron transport layer for balancing electrons and holes, but is not limited thereto.

The organic light emitting display panel may further include an encapsulation substrate. An encapsulation substrate may exist on the second electrode layer. The encapsulation substrate can be made of glass, metal and/or polymer, and can encapsulate the first electrode layer, the organic light emitting layer and the second electrode layer to prevent moisture and/or oxygen from being introduced from the outside.

The optical stack of the present application has excellent UV blocking properties, especially the package The efficacy of UV rays in the blue region including 380 nm or greater.

In particular, when the optical stack of the present application has been applied to an organic light emitting device, it can minimize the lifetime shortening of a blue light source in the organic light emitting device.

The optical stacks of the present application can simultaneously exhibit excellent durability without substantially changing color values and compromising optical properties.

10, 101, 201, 301, 401: Polarizer

20, 102, 202, 302, 402: delay layer

30, 405: adhesive layer

40, 408: pressure sensitive adhesive layer

100: polarizer

103: upper layer

203: lower layer

303: middle layer

403: hard coating

404: Polarizer protective film

406: Retardation layer base film

407:+C board

701: Substrate

702: the first electrode layer

703: Organic light-emitting layer

704: second electrode layer

1 to 6 are diagrams illustratively showing the structure of the optical stack of the present application.

FIG. 7 is a diagram illustratively showing the structure of the organic light-emitting device of the present application.

Fig. 8 is the H-nuclear magnetic resonance (H-NMR) results of the preparation example.

In the following, the present application is explained with reference to examples. However, the scope of rights of the present application is not limited by the following examples.

1. Evaluation of optical properties of polarizing plates

The polarizing plates prepared in Examples and Comparative Examples were cut into a size of 25 mm×25 mm (width×length) to produce samples.

By measuring the transmittance of the polarizing plate using an ultraviolet-visible spectrometer (V-7100, JASCO), the blocking performance against ultraviolet rays including a blue region was evaluated. Here, when the total light incident amount is set to 100, the transmittance means the amount of light transmitted through the polarizing plate in ratio %.

2. Durability evaluation under reliability conditions

Samples prepared by cutting the polarizing plates prepared in Examples and Comparative Examples into a size of 90 mm×170 mm (width×length) were prepared from two sheets of each of Examples and Comparative Examples.

Subsequently, two sheets of the prepared samples were attached to both sides of a glass substrate (110 mm×190 mm×0.7 mm=width×length×thickness) such that the optical absorption axes of the respective polarizing plates cross to prepare samples for evaluation.

The pressure applied at the time of attachment was about 5 kg/cm 2 , and the work was performed in a clean room so that no air bubbles or foreign matter would occur at the interface.

The prepared samples were placed in a reliability chamber, and then it was observed whether bubbles or bumps appeared at the interface of the pressure-sensitive adhesive layer after being left at a temperature of 80° C. for 500 hours (evaluation of heat resistance). The heat resistance evaluation criteria are as follows.

<Heat Resistance Evaluation Criteria>

O: No bumps or air bubbles occurred

△: There are 5 or less bubbles per unit area of 1 cm × 1 cm (width × length), or bulges appear

×: There are more than 5 bubbles per unit area of 1 cm × 1 cm (width × length), or a large number of bulges appear

In addition, the prepared sample was placed in a reliability chamber and left for 1,000 hours at a temperature of 60°C and a relative humidity of 90%, and then it was observed whether swelling appeared at the interface of the pressure-sensitive adhesive layer (moisture and heat resistance evaluation) . The criteria for evaluating the heat and humidity resistance are as follows.

<Evaluation Criteria for Moisture and Heat Resistance>

◎: No swelling occurs

O: Less swelling occurs

△: Swelling occurs

×: A large amount of swelling occurs

3. Evaluation of color characteristics of polarizing plates

The polarizing plates of Examples and Comparative Examples were cut into a size of 25 mm×25 mm (width×length) to prepare samples. The visual appreciation characteristics of the polarizing plate were evaluated by measuring the color coordinates of the polarizing plate using an ultraviolet-visible spectrometer (V-7100, manufactured by JASCO Corporation).

Preparation example-preparation of ultraviolet absorber (A)

A malononitrile compound (2-(4-hydroxy-2-methoxybenzylidene)malononitrile) of the following formula A was prepared according to the following procedure.

1) Put the compound of the following formula A1 and the compound of the following formula A2 in a molar ratio of 1:1 in a reactor containing ethanol and stir.

2) 1,8-diazabicyclo (5.4.0) undec-7-ene (1,8-diazabicyclo (5.4.0) undec-7-ene, DBU) with the input amount of the compound of formula A1 The equivalent of 0.1 times of the is slowly introduced into the reactor.

3) Stir it at a temperature of about 25°C for about 12 hours.

4) Add hydrochloric acid (Hydrochloric acid, HCl) at the same molarity as the ethanol introduced in step 2).

5) After the reaction is completed, the resultant of step 4) is filtered to obtain the final product in a solid state.

The NMR analysis results of the obtained compound of formula A are shown in FIG. 8 .

H-NMR analysis was performed using an Agilent NMR spectrometer (A500a, 500 megahertz). Specifically, the analyte is diluted to a concentration of about 10 mg/ml in dimethyl sulfoxide (DMSO) as a solvent for NMR measurement, wherein the chemical shift is expressed in ppm.

Pressure sensitivity was measured using gel permeation chromatography (GPC) under the following conditions The weight average molecular weight of the binder polymer. To create a calibration curve, the measurements were converted using polystyrene standards from the Agilent system.

Measuring instrument: Agilent GPC (Agilent 1200 series, USA)

Column: two PL mixed B connected

Column temperature: 40°C

Eluent: tetrahydrofuran (tetrahydrofuran, THF)

Flow rate: 1.0ml/min

Concentration: ~2 mg/ml (100 μl injection)

Production of pressure sensitive adhesive layers

The pressure-sensitive adhesive composition was coated on a release-treated poly(ethylene terephthalate) (PET) film (thickness: 38 μm, MRF-38, Mitsubishi chemical). on the release-treated surface to have a thickness of about 10 micrometers after drying, and thermally cured in an oven (Mathis oven) at 80° C. for 3 minutes to produce a pressure-sensitive adhesive layer.

Production of polarizing plates (optical laminates)

A polarizing plate was prepared by laminating (stacking) the prepared pressure-sensitive adhesive layer on one side of a known polarizing plate protected with triacetyl cellulose (TAC) having a thickness of about 60 μm. A film protects both sides of the poly(vinyl alcohol) (PVA) series polarizer.

The compositions of the pressure-sensitive adhesive compositions prepared in the above Examples and Comparative Examples and the evaluation results of physical properties of the optical laminates are set forth in Table 1 below.

[Table 1]

According to Table 1, since the optical stack of the present application has a transmittance of less than 1% for light with a wavelength of 380 nm or greater than 380 nm, especially light with a wavelength in the range of 380 nm to 400 nm, So that it has a high blocking property for light having a wavelength within the above-mentioned range, it can thus be seen that it is suitable for protecting blue light sources of organic light-emitting devices. Furthermore, it can be seen that the optical laminates of the comparative examples derived from pressure-sensitive adhesive compositions not using the compounds defined in this application have extremely high a* values and relatively high b* values, resulting in poor Visually appreciative properties, and especially yellow due to high b* values. However, it can be seen that optical stacks satisfying the conditions defined in this application have appropriate a* and b* values, thereby not only having excellent visual appreciation properties, but also Has excellent durability.

10: Polarizer

20: Delay layer

30: Adhesive layer

40: Pressure sensitive adhesive layer

Claims (24)

An optical laminate comprising an optical film; and a pressure-sensitive adhesive layer present on one or both sides of the optical film, wherein the pressure-sensitive adhesive layer comprises a cured product of a pressure-sensitive adhesive composition, the pressure-sensitive adhesive layer The sensitive adhesive composition comprises a pressure sensitive adhesive polymer, a compound of the following formula 1 and a compound of the following formula 2:

Wherein, R ¹ to R ⁵ are each independently hydrogen or -OX ¹ , wherein X ¹ is hydrogen or an alkyl group, but two or more of R ¹ to R ⁵ are -OX ¹ ,

Wherein, R ⁶ to R ⁹ in formula 2 are each independently hydrogen, an alkyl group or a substituent of the following formula 3, but at least one of R ⁶ to R ⁹ is a substituent of the formula 3: [Formula 3 ]

Wherein, A is a single bond, alkylene, alkenylene, alkynylene, -C(=O)O- or -OC(=O)-, and R ¹⁰ to R ¹⁴ are each independently hydrogen, alkyl , alkenyl, alkynyl, aryl, alkoxy, nitro, amino or hydroxyl, wherein based on 100 parts by weight of the pressure-sensitive adhesive polymer, the pressure-sensitive adhesive composition contains a ratio of 0.01 The compound of formula 1 in the range of from 10 parts by weight to 10 parts by weight. The optical stack according to claim 1, wherein R ³ in Formula 1 is -OH, and any one of R ¹ and R ⁵ is -OX ¹ , wherein X ¹ is an alkyl group. The optical stack according to claim 1, wherein at least one of R ⁶ , R ⁷ and R ⁹ in formula 2 is a substituent of formula 3. The optical stack as claimed in item 3, wherein R ⁶ , R ⁷ and R ⁹ in formula 2 are substituents of formula 3, and in R ⁹ , A of formula 3 has 2 to 4 carbons Atoms of alkenylene. The optical laminate according to claim 4, wherein in R ⁶ and R ⁷ , A in Formula 3 is a single bond. The optical laminate as claimed in item 1, wherein the pressure-sensitive adhesive composition further comprises a compound of the following formula 4:

Wherein, R ¹⁵ to R ¹⁹ are each independently hydrogen, alkyl, -OX ² or -NX ² ₂ , wherein X ² is hydrogen or alkyl, but at least one of R ¹⁵ to R ¹⁹ is -OX ² or -NX ² ₂ , and R ²⁰ or R ²¹ is hydrogen or alkyl. The optical stack according to claim 6, wherein R ¹⁵ to R ¹⁹ in Formula 4 are each independently hydrogen or -NX ² ₂ , but at least one of R ¹⁵ to R ¹⁹ is -NX ² ₂ . The optical stack according to claim 6, wherein in Formula 4, R ¹⁷ is -NX ² ₂ , and R ¹⁵ to R ¹⁶ and R ¹⁸ to R ¹⁹ are each independently hydrogen, alkyl or -OX ² . The optical stack according to claim 8, wherein in Formula 4, R ²⁰ and R ²¹ are alkyl groups having 1 to 4 carbon atoms. The optical laminate of claim 1, wherein the pressure sensitive adhesive polymer is an acrylic polymer. The optical laminate of claim 10, wherein the acrylic polymer comprises polymerized units of monomers of the following formula 5:

Wherein, Q is hydrogen or alkyl, and B is straight-chain or branched-chain alkyl. The optical laminate of claim 11, wherein the acrylic polymer further comprises polymerized units of a copolymerizable monomer having a polar group. The optical laminate according to claim 1, wherein the pressure-sensitive adhesive composition includes the pressure-sensitive adhesive polymer in a ratio of 50% by weight or more. The optical laminate according to claim 1, wherein based on 100 parts by weight of the compound of formula 1, the pressure-sensitive adhesive composition contains the formula 2 in a ratio of 1 to 30 parts by weight. compound of. The optical laminate according to claim 6, wherein based on 100 parts by weight of the compound of formula 1, the pressure-sensitive adhesive composition contains the formula 4 in a ratio ranging from 10 parts by weight to 90 parts by weight. compound of. The optical laminate according to claim 11, wherein the pressure-sensitive adhesive polymer includes the polymerized units of the monomer of the formula 5 in a ratio of 50% by weight or more. The optical stack as claimed in claim 12, wherein by 100 weight The pressure-sensitive adhesive polymer includes the copolymerizable monomer having the polar group in a ratio ranging from 0.1 parts by weight to 30 parts by weight based on the polymerized units of the monomer of the formula 5. of the polymerization unit. The optical stack of claim 1, wherein the optical film is a polarizer. The optical laminate according to claim 18, wherein the polarizer comprises a polyvinyl alcohol-based compound. The optical stack as claimed in claim 18, further comprising a retardation layer. The optical stack of claim 20, wherein the retardation layer is present between the optical film and the pressure sensitive adhesive layer. An organic light-emitting device, comprising the optical laminate and an organic light-emitting panel according to claim 1, wherein the optical film is attached to the organic light-emitting panel through the pressure-sensitive adhesive layer. The organic light-emitting device according to claim 22, wherein the organic light-emitting panel includes: a substrate; and a first electrode layer, an organic light-emitting layer, and a second electrode layer sequentially arranged on the first surface of the substrate, wherein The optical stack is on a side where light is emitted from the organic light emitting panel. The organic light emitting device as claimed in claim 23, wherein the substrate of the organic light emitting panel is a plastic substrate.

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