KR20170111553A - Organic phosphor for optical film and Optical film containing the same - Google Patents

Abstract

The present invention relates to a novel organic fluorescent material and an optical film using the organic fluorescent substance. More specifically, the present invention relates to an organic fluorescent substance having excellent optical properties by introducing an organic fluorescent substance having excellent heat stability and light stability will be.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic fluorescent material for an optical film and an optical film containing the organic fluorescent material.

The present invention relates to an organic fluorescent substance for an optical film excellent in light stability and heat resistance and an optical film produced using the organic fluorescent substance.

Quantum dots are nanoscale semiconductor materials that exhibit a quantum confinement effect. The quantum dots generate stronger light in a narrow wavelength band than ordinary phosphors.

The luminescence of quantum dots is generated by the transfer of electrons excited from the conduction band to the valence band. In the case of the same material, the wavelength exhibits characteristics depending on the particle size. As the size of the quantum dots decreases, the light of a short wavelength is emitted, so that light of a desired wavelength range can be obtained by controlling the size.

The quantum dot emits when excitation wavelength is arbitrarily selected. Therefore, when there are various kinds of quantum dots, the quantum dot excites to one wavelength, and various colors of light can be observed at a time. Even if the quantum dots are made of the same material, the color of the emitted light may vary depending on the particle size. Due to such characteristics, quantum dots are attracting attention as next generation high brightness light emitting diodes (LEDs), bio sensors, lasers, and solar cell nano materials.

Currently, the production method that is commonly used to form quantum dots is nonhydrolytic synthesis. According to this method, a nucleus is formed (nuclraization) by thermal decomposition reaction by rapid injection of a metalorganic compound at room temperature as a precursor or precursor into a high-temperature solvent, and then nuclei are grown by applying a temperature to grow quantum dots Manufacturing. The quantum dots mainly synthesized by this method contain cadmium (Cd) such as cadmium selenium (CdSe) or cadmium tellurium (CdTe). However, considering the current trend of pursuing the green industry due to heightened environmental awareness, it is necessary to minimize the use of cadmium (Cd) which is one of the typical environmental pollutants that pollute water quality and soil.

Therefore, it is considered to manufacture quantum dots as a semiconductor material which does not contain cadmium as an alternative for replacing existing CdSe quantum dots or CdTe quantum dots. Indium phosphide (InP) quantum dots are one of them.

Particularly, the indium phosphide (InP) has a bulk band gap of 1.49 eV, and the InP quantum dot can emit light in a visible light region, and thus can be used for manufacturing a high-luminance light emitting diode device and the like. However, since Group 13 and Group 16 are generally difficult to synthesize, it is not only difficult to mass-produce indium phosphide quantum dots but also has a disadvantage in that the uniformity of the particle size is ensured and the quantum yield (QY) is lower than that of the conventional CdSe .

Therefore, there is a growing demand for the development of new fluorescent materials that do not use cadmium.

In addition, QDEF (3M ^@ beauty) adopts a method of coating inorganic quantum dots (QDs) by using a binder, and quantum dots are oxidized to deteriorate characteristics, so it is necessary to use an expensive gas barrier film . The quantum dot, which is the address material of the color reproduction compensation film, is generally an inorganic material, so a high-temperature extrusion process may be possible. However, it is very difficult to disperse the polymer because the specific gravity is 4 to 6 times higher than that of the binder polymer. There is a problem that the characteristic deterioration is large and the use thereof is practically impossible.

In addition, conventional organic phosphors have poor thermal stability, and thus there is a problem that optical stability and color reproducibility are greatly reduced when an optical film is produced through an extrusion process.

U.S. Published Patent Application No. 2012-0113672 (2012.05.10)

As a result of efforts to manufacture a new material capable of replacing quantum dots of existing inorganic materials, the present inventors have found that when a monomolecular type organic phosphor having a stable thermal property is introduced, it is possible to use a coating process or an extrusion process It has been found that not only an optical film can be produced, but also excellent optical stability can be obtained. Thus, the present invention has been completed. That is, the present invention provides a green organic phosphor having a specific chemical structure and an optical film using the green organic phosphor.

The present invention for solving the above problems is an organic phosphor having a PL wavelength of 500 to 550 nm in a monomolecular form, and includes a compound represented by the following formula (1).

[Chemical Formula 1]

또는

이며, R³은 C1 ~ C4의 직쇄형 알킬기 또는 C3 ~ C6의 분쇄형 알킬기이고, n은 0 ~ 3이다.In the formula 1, wherein R ¹ is a straight-chain alkyl group or branched alkyl group of C3 ~ C10 ~ C10 of the C3, A, B, C and D each independently represent a halogen atom or an -OR ^2, R ² is C3 ~ C10 straight-chain alkyl group, C3-C10 branched alkyl group, C5-C10 cycloalkyl group,

or

R ³ is a straight-chain alkyl group having 1 to 4 carbon atoms or a branched alkyl group having 3 to 6 carbon atoms, and n is 0 to 3.

In one preferred embodiment of the present invention, R ¹ in the formula (1) may be a straight-chain alkyl group of C 3 to C 5 or a branched alkyl group of C 3 to C 5.

또는

이고, R³은 -CH₃, -CH₂CH₃, -C(CH₃)₃ 또는 -CH(CH₃)₂이며, n은 0 ~ 3일 수 있다.In one preferred embodiment of the present invention, each of A, B, C and D in Formula 1 is independently a halogen atom or -OR ² , and R ² is

or

And R ³ is -CH ₃ , -CH ₂ CH ₃ , -C (CH ₃ ) ₃ or -CH (CH ₃ ) ₂ , and n may be 0 to 3.

이고, n은 0이며, B 및 C는 -F 또는 -Cl일 수 있다.In one preferred embodiment of the present invention, A and D in Formula 1 are -OR ² , and R ² is

, N is 0, and B and C may be -F or -Cl.

As a preferred embodiment of the present invention, the organic phosphor of the present invention may have a specific gravity of 1.0 to 2.0 g / cm 3 and a pyrolysis temperature of 270 ° C or higher.

Another object of the present invention is to provide an optical film comprising the organic fluorescent material, wherein the optical film is preferably a color compensation film.

In another preferred embodiment of the present invention, the optical film may be a cured product of the coating liquid containing the organic fluorescent substance and the transparent resin.

In another preferred embodiment of the present invention, the optical film may be an extruded film obtained by extruding a master batch containing the organic fluorescent substance and the transparent resin.

As a preferred embodiment of the present invention, the transparent resin of the extruded film may be a polycarbonate resin, a polyethylene terephthalate resin, polymethyl methacrylate (PMMA), co-polymethyl methacrylate (co- PMMA), ABS (acrylonitrile-butadiene-styrene) resin, and PS (polystyrene) resin.

In one preferred embodiment of the present invention, the polycarbonate resin may have a MI (melting index) of 1 to 40 and a glass transition temperature (Tg) of 130 ° C to 160 ° C.

In a preferred embodiment of the present invention, the polyethylene terephthalate resin may be a polyethylene terephthalate resin having an intrinsic viscosity () of 0.5 to 1.0 dl / g.

In one preferred embodiment of the present invention, the extruded film may have a single-layer structure or a multilayer structure in which a plurality of the extruded films are laminated.

In one preferred embodiment of the present invention, the optical film of the present invention may further include a red organic phosphor having a PL wavelength of 600 nm to 680 nm in addition to the organic phosphor.

In one preferred embodiment of the present invention, the optical film of the present invention may further comprise a film for a skin layer on one or both sides.

As one preferred embodiment of the present invention, the optical film of the present invention may have a light diffusion surface structure formed on a surface of an optical film on one surface, or may further include a light diffusion film or a light condensation film on one surface.

As a preferred embodiment of the present invention, the optical film of the present invention may be applied as a single composite type optical film by integrating a light guide plate, a diffusion film, a light collecting film, and a reflective polarizer.

In one preferred embodiment of the present invention, the optical film of the present invention has a deviation range of the x-coordinate of 0.0001 to 0.0020 and a y-coordinate (y-coordinate) of the y-coordinate in the color deviation measurement based on NTSC (National Television System Committee) color coordinates under a blue light source The deviation range may be 0.0001 to 0.0020.

As a preferred embodiment of the present invention, the optical film of the present invention has a temperature (T _d ) at which a weight loss of 5% is lost is not less than 300 ° C .

In one preferred embodiment of the present invention, the optical film of the present invention may have an average thickness of 10 to 1,000 탆.

Another object of the present invention is to provide a backlight unit, a light emitting diode (LED) display, a light emitting diode (LED) illumination device or a liquid crystal display (LCD) including various types of optical films as described above.

The organic phosphor of the present invention does not have a problem of being durable as it is oxidized like a quantum dot and uses an organic phosphor having a low specific gravity. Therefore, the organic phosphor is excellent in dispersibility in a resin and is excellent in luminance stability and optical stability of an optical film, In addition, since an optical film can be manufactured through an extrusion method, an optical film having excellent commercial mass productivity can be produced. The optical film using the organic fluorescent material of the present invention can be applied to various fields such as an LED lighting device, an LED display device, and a liquid crystal display device by applying it as a color compensation film.

Fig. 1 is a graph of light stability measurement of the optical film of Example 1. Fig.
Fig. 2 is a graph showing a change in luminance change over time of the optical film of Example 1. Fig.
FIG. 3 is a graph showing a change in luminance with time of the optical films of Example 1, Comparative Example 1, and Comparative Example 2. FIG.

The term "film" used in the present invention has a broad meaning including not only a film form commonly used in the art but also a sheet form.

The term " C1 ", "C2 ", etc. used in the present invention means a carbon number. For example," C1 to C5 alkyl "means an alkyl group having 1 to 5 carbon atoms.

로 표현된 화학식에서, R¹은 독립적으로 수소원자, 메틸기 또는 에틸기이며, a는 1 ~ 3이다" 라고 치환기에 대해 표현되어 있을 때, a가 3인 경우, 복수의 R¹, 즉 R¹ 치환기가 3개가 있고, 이들 복수 개의 R¹들 각각은 서로 같거나 다른 것으로서, R¹들 각각은 모두 수소원자, 메틸기 또는 에틸기일 수 있으며, 또는 R¹들 각각은 다른 것으로서, R¹ 중 하나는 수소원자, 다른 하나는 메틸기 및 또 다른 하나는 에틸기일 수 있음을 의미하는 것이다. 그리고, 상기 내용은 본 발명에서 표현된 치환기를 해석하는 일례로서, 다른 형태의 유사 치환기도 동일한 방법으로 해석되어야 할 것이다.In the present invention,

Lt; RTI ID = 0.0 > R ¹ is independently a hydrogen atom, a methyl group or an ethyl group, a is 1 to 3, "when a is 3, there are a plurality of R ¹ , that is, R ¹ substituents, Each of R ¹ s may be the same or different and each of R ¹ s may all be a hydrogen atom, a methyl group or an ethyl group, or each of R ¹ s are different and one of R ¹ is Hydrogen atom, the other is a methyl group, and the other is an ethyl group. The above is an example of interpreting the substituent represented by the present invention, and other similar substituents should also be interpreted in the same way.

"로 표현된 화학식에서 "*"표시는 치환기가 연결되는 부위를 의미한다.Further, in the present invention,

Quot; in the chemical formula represented by "" means a site to which a substituent is connected.

Hereinafter, the present invention will be described in detail.

The conventional organic phosphors have poor heat resistance and thus can not be used for commercialization of extruded optical films through an extrusion process. However, the present invention is a monomolecular organic phosphor having excellent heat resistance, It is possible to manufacture an optical film. Further, the present invention relates to an organic phosphor having excellent light stability and luminance stability, and more particularly to a green organic phosphor having a mono-molecular type having a PL (photoluminescence) wavelength of 500 nm to 550 nm.

The organic phosphor of the present invention includes the compound represented by the general formula (1).

[Chemical Formula 1]

R ¹ in the above formula (1) is a straight-chain alkyl group of C 3 to C 10 or a branched alkyl group of C 3 to C 10, preferably R ¹ is a straight-chain alkyl group of C 3 to C 5 or a branched alkyl group of C 3 to C 5, Is a C3 to C5 branched alkyl group.

Each of A, B, C and D is independently a halogen atom or -OR ² , preferably A, B, C and D are all or -OR ² , or A and D are -OR ² , And B and C may be a halogen atom.

또는

이며, 바람직하게는 R²는

또는

이고, 더욱 바람직하게는 R²는

이다. And R ² is a straight-chain alkyl group of C 3 to C 10, a branched alkyl group of C 3 to C 10, a cycloalkyl group of C 5 to C 10,

or

, Preferably R < ^{2 >} is

or

, More preferably R < ^{2 >} is

to be.

And R ³ is a straight-chain alkyl group having 1 to 4 carbon atoms or a branched alkyl group having 3 to 6 carbon atoms, preferably -CH ₃ , -CH ₂ CH ₃ , -C (CH ₃ ) ₃ or -CH (CH ₃ ) ₂ . In formula (1), n is 0 to 3.

The organic phosphor of the present invention preferably has a specific gravity of 1.0 to 2.0 g / cm 3 and a thermal decomposition temperature (TD) of 270 ° C or higher, preferably 300 ° C or higher. At this time, When the specific gravity is less than 1.0 g / cm 3 or the specific gravity exceeds 2.0 g / cm 3, the dispersibility in the transparent resin is decreased and the workability is deteriorated. The organic phosphor in the extruded optical film is not uniformly dispersed, have.

If the pyrolysis temperature of the organic phosphor of the present invention is less than 270 캜, it is possible to produce a film by the coating process. However, due to the nature of the extrusion process performed at a high temperature, deformation and decomposition may occur during extrusion, And even if an optical film is produced through extrusion, the structure of the organic fluorescent material may be broken and the light stability may be greatly reduced.

The green-based organic phosphor having the PL wavelength of 500 nm to 550 nm according to the present invention can be applied to various optical films through a coating process or an extrusion process.

Specifically, an optical film which is a cured product of the coating liquid containing the organic fluorescent substance and the transparent resin may be produced, or an extruded film type optical film obtained by extruding the master batch containing the organic fluorescent substance and the transparent resin may be produced.

The transparent resin may be a transparent resin commonly used in the art. Examples of the transparent resin include polyester resins such as polyurethane resin, polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyethylene resins, polypropylene resins, Polyvinylidene chloride resin, polyvinyl alcohol resin, ethylene-vinyl acetate copolymer resin, polystyrene resin, polycarbonate resin, polymethylpentene resin, polymethylmethacrylate resin, A polyether ether ketone resin, a polyether sulfone resin, a polyether imide resin, a polyimide resin, a fluorine resin, a polyamide resin, an acrylic resin, a norbornene resin, a cycloolefin resin and the like can be used.

In addition, the transparent resin of the extruded film may be a polycarbonate resin, a polyethylene terephthalate resin, polymethylmethacrylate (PMMA), co-polymethylmethacrylate (co-PMMA), acrylonitrile-butadiene -styrene resin and PS (polystyrene) resin may be used.

The PC resin is an amorphous resin having a high glass transition temperature (Tg), so that a color-compensated extruded optical film having high reliability can be produced without stretching the extruded film, and a PC Preferably a PC resin having a MI (melting index) of 1 to 40 and a glass transition temperature (Tg) of 130 to 160 ° C, more preferably an MI of 4 to 35, and a glass transition PC resin with a temperature of 140 ° C to 160 ° C is recommended. At this time, if the MI of the PC resin exceeds 40, extrusion workability deteriorates, which is not only disadvantageous in terms of mass production, but also has a problem that the high temperature storage stability of the color compensated extruded optical film (WHTS) falls. When a PET resin is used, it is necessary to stretch the extruded film. PET resin generally used in the art can be used as the PET resin, but preferably has an intrinsic viscosity (IV) of 0.5 to 1.0 dl / g PET resin, more preferably a PET resin having an intrinsic viscosity (IV) of 0.65 to 0.80 dl / g is preferably used. If the intrinsic viscosity of the PET resin is less than 0.5 dl / g, the extrusion workability tends to deteriorate, which may be disadvantageous in terms of mass productivity. If the intrinsic viscosity exceeds 1.0 dl / g, The PET resin having an intrinsic viscosity within the above range may be used.

In the optical film of the present invention, a red color organic phosphor having a PL wavelength of 600 to 680 nm may be additionally used as a white color compensation film in addition to the green organic phosphor having a PL wavelength of 500 nm to 550 nm.

Here, the red organic phosphor may be a conventional red organic phosphor, but it is preferable to use a red organic phosphor having excellent heat resistance and optical stability capable of being extruded. As a preferable example of such a red organic phosphor, one or a mixture of two or more of the perylene-based organic phosphors represented by the following formula (2) may be used in combination.

(2)

또는 -CN이며, 바람직하게는 C1 ~ C5의 알킬기 또는

이며, 더욱 바람직하게는

이다. In Formula 2, each of R ¹ and R ⁴ is independently a hydrogen atom, a straight chain alkyl group having 1 to 5 carbon atoms, a branched alkyl group having 3 to 5 carbon atoms, a cycloalkyl group having 5 to 6 carbon atoms,

Or -CN, preferably a C1-C5 alkyl group or

, And more preferably

to be.

,

또는

이고, 바람직하게는

,

또는

이며, 더욱 바람직하게는 R², R³, R⁵ 및 R⁶ 각각은 독립적으로

,

또는

이다. 다만, 상기 화학식 3의 R³와 R⁶이 수소원자인 경우, R²와 R⁵는 수소원자가 아니다. 이때, 상기 R⁷ 및 R⁸은 독립적으로 수소원자, C1 ~ C5의 직쇄형 알킬기, C3 ~ C5의 분쇄형 알킬기, 또는 C1 ~ C3의 알콕시기이고, 바람직하게는 C2 ~ C4의 직쇄형 알킬기, C3 ~ C4의 분쇄형 알킬기 또는 C1 ~ C3의 알콕시기, 더욱 바람직하게는 C3 ~ C4의 직쇄형 알킬기 또는 C1 ~ C2의 알콕시기이다.Each of R ² , R ³ , R ⁵ and R ^{6 in the general} formula (2) independently represents a hydrogen atom, a C 1 to C 5 alkoxy group, a C 5 to C 10 cyclic alkoxy group,

,

or

, And preferably

,

or

, More preferably each of R ² , R ³ , R ⁵ and R ⁶ is independently

,

or

to be. However, when R < ³ > and R < ^{6 &} When it is a hydrogen atom, R ² and R ⁵ are not hydrogen atoms. R ⁷ and R ⁸ are each independently a hydrogen atom, a straight-chain alkyl group of C 1 to C 5, a branched alkyl group of C 3 to C 5, or an alkoxy group of C 1 to C 3, preferably a linear alkyl group of C 2 to C 4, A C3 to C4 branched alkyl group or a C1 to C3 alkoxy group, more preferably a C3 to C4 linear alkyl group or a C1 to C2 alkoxy group.

Each of R ⁹ and R ¹⁰ in the formula (2) is independently a hydrogen atom, -SO ₃ H, -COOH, -CH ₂ COOH, -CH ₂ CH ₂ COOH, -CH ₂ CH ₂ CH ₂ COOH, -NR ¹¹ R ¹² , -CH ₂ NR ¹¹ R ¹² , or -CH ₂ CH ₂ NR ¹¹ R ¹² , Preferably a hydrogen atom, -SO ₃ H, -COOH, -CH ₂ COOH or -CH ₂ NR ¹¹ R ¹² , more preferably a hydrogen atom or -SO ₃ H.

Each of R ¹¹ and R ¹² is independently a hydrogen atom or a straight-chain alkyl group having 1 to 3 carbon atoms. Preferably, R ¹¹ and R ¹² are each independently A hydrogen atom or a methyl group.

In addition to the green and / or red organic phosphors and transparent resins described above, the optical film of the present invention may further contain beads; And other phosphors including at least one selected from polymer dots and dyes; And additives; , And the like.

The beads are additionally used to uniformly distribute light to improve color, and the beads may include at least one selected from monodisperse beads and polydisperse beads. The beads may be formed of at least one selected from silica, zirconia, titanium dioxide, polystyrene, polypropylene, polyethylene, polyurethane and polymethyl (meth) acrylate, preferably in a monodispersed form of silica, polystyrene and titanium dioxide One or more selected ones may be used, and monodisperse type beads containing silica of a transparent material may be more preferably used.

Among the other phosphors, the polymer dot may include at least one selected from a random copolymer represented by the following formula (3) and a random copolymer represented by the following formula (4).

(3)

을 포함하는 C2 ~ C4의 올레핀기이고, 여기서, R¹⁴는 메틸기 또는 에틸기이며, n은 0 ~ 3의 정수이며, R⁶ ~ R¹¹ 각각은 독립적으로 C1 ~ C12의 직쇄형알킬기, C4 ~ C12의 분쇄형알킬기 또는 C2 ~ C12의 올레핀기이며, R¹² ~ R¹³는 독립적으로 C1 ~ C5의 알킬기고, R¹⁵는 -OH, -OCH₃ 또는 -OCH₂CH₃이며, a, b, c, d는 중합체를 구성하는 단량체간의 몰비를 나타낸 것으로서, a, b, c, d의 몰비는 1 : 1 ~ 1.5 : 5 ~ 25 : 1 ~ 1.5이고, A 및 B는 독립적으로 페닐기, 페닐기, 바이페닐기, 안트라센기 및 나프탈렌기 중에서 선택된 1종 이상의 말단기이며, L은 공중합체의 중량평균분자량 1,000 ~ 50,000을 만족하는 유리수이다.Wherein R ¹ is a methyl group or an ethyl group, m is an integer of 0 to 3, R ² is a hydrogen atom, a methyl group or an ethyl group, R ³ is a C1 to C5 alkyl group, a C2 to C5 olefin group, A C5-C6 cycloalkyl group, a phenyl group or

Wherein R ¹⁴ is a methyl group or an ethyl group, n is an integer of 0 to 3, each of R ⁶ to R ¹¹ is independently a straight-chain alkyl group of C 1 to C 12, a straight chain alkyl group of C 4 to C 12 R ¹² to R ¹³ are each independently a C 1 to C 5 alkyl group, R ¹⁵ is -OH, -OCH ₃ or -OCH ₂ CH ₃ , and a, b, c and d is a molar ratio between the monomers constituting the polymer, wherein the molar ratio of a, b, c and d is 1: 1 to 1.5: 5 to 25: 1 to 1.5, A and B independently represent a phenyl group, An anthracene group and a naphthalene group, and L is a rational number satisfying a weight average molecular weight of the copolymer of 1,000 to 50,000.

을 포함하는 C2 ~ C4의 올레핀기이며, R¹⁴는 메틸기이고, n은 0 또는 1이고, R⁶ ~ R¹¹ 각각은 모두 동일하며, R⁶ ~ R¹¹은 C6 ~ C10의 직쇄형 알킬기 또는 C6 ~ C10의 분쇄형 알킬기이고, A 및 B는 페닐기인 것을 특징으로 할 수 있다.Preferably, R ¹ in the general formula (3) is a methyl group, m is an integer of 1 to 3, R ² is a hydrogen atom or a methyl group, R ³ is a C 1 to C 5 olefin or

, R ¹⁴ is a methyl group, n is 0 or 1, R ⁶ to R ¹¹ are all the same, R ⁶ to R ¹¹ are a straight-chain alkyl group of C6 to C10 or C6 To C10, and A and B are phenyl groups.

[Chemical Formula 4]

을 포함하는 C2 ~ C4의 올레핀기이고, 여기서, R⁸은 메틸기 또는 에틸기이며, n은 0 ~ 3의 정수이며, R⁶ 및 R⁷ 각각은 독립적으로 C1 ~ C12의 직쇄형 알킬기, C4 ~ C12의 분쇄형 알킬기 또는 C2 ~ C12의 올레핀기이고, a 및 b의 몰비는 1 : 5 ~ 15이고, A 및 B는 독립적으로 페닐기, 바이페닐기, 안트라센기 및 나프탈렌기 중에서 선택된 1종 이상의 말단기이며, L은 공중합체의 중량평균분자량 1,000 ~ 100,000을 만족하는 유리수이다.Wherein R ¹ is a hydrogen atom or an alkyl group having ¹ to 5 carbon atoms, R ² and R ³ are independently a hydrogen atom, a methyl group or an ethyl group, R ⁴ and R ⁵ are each independently a hydrogen atom, a C 1 to C 5 An alkyl group, a C2 to C5 olefin group, a C5 to C6 cycloalkyl group, a phenyl group or

Wherein R ⁸ is a methyl group or an ethyl group, n is an integer of 0 to 3, each of R ⁶ and R ⁷ is independently a straight-chain alkyl group of C 1 to C 12, a straight chain alkyl group of C 4 to C 12 And the molar ratio of a and b is 1: 5 to 15, and A and B are independently at least one end group selected from a phenyl group, a biphenyl group, an anthracene group and a naphthalene group , And L is a rational number satisfying the weight-average molecular weight of the copolymer of 1,000 to 100,000.

Preferably, R ¹ in Formula 4 is a methyl group, R ² and R ³ are independently a hydrogen atom or a C 1 to C 2 alkyl group, R ⁴ and R ⁵ are independently a hydrogen atom or a C 1 to C 5 alkyl group , R ⁶ and R ⁷ are independently a straight chain alkyl group of C 6 to C 10 or a branched alkyl group of C 6 to C 10, and A and B are phenyl groups.

In addition, among the above-mentioned other phosphors, the dyes for optical films used in the related art may be used, and preferably at least one selected from Coumain, Green and Rhodamine (Red) .

The additive may include one or more selected from a light stabilizer, an ultraviolet absorber, an antistatic agent, a lubricant, a leveling improver, a defoamer, a polymerization promoter, an antioxidant, a flame retardant, an infrared absorbent, a surfactant and a surface modifier .

In addition, the optical film of the present invention may be a film having a single-layer structure including the green-based organic fluorescent material, or may be a multi-layered film including a plurality of film layers including the green-based organic fluorescent material. In this case, when the optical film of the present invention is produced by an extrusion process, since the multilayered film can be multilayered by coextrusion, the laminated films can be directly bonded without any adhesive, Lt; / RTI >

The optical film of the present invention may have a deviation range of x-coordinate of 0.0001 to 0.0020 and a y-coordinate deviation range of 0.0001 to 0.0020 at the time of color deviation measurement based on National Television System Committee (NTSC) color coordinates under a blue light source , Preferably the deviation range of the x-coordinate is 0.0001 to 0.0015, and the y-coordinate deviation range is 0.0001 to 0.0012.

In addition, the thickness of the optical film of the present invention can be suitably adjusted according to the optical film to be applied or applied, and is not particularly limited, but preferably has an average thickness of about 10 to 1,000 μm.

The optical film of the present invention may further comprise a film for a skin layer on one side or both sides. The optical film of the present invention may have a light diffusion surface structure on the surface of the optical film on one side, And may further include a film.

In addition, the optical film of the present invention may be applied as a single composite type optical film by integrating a light guide plate, a diffusion film, a light collecting film, and a reflective polarizer.

[Manufacturing method]

Hereinafter, a preferred example of the method of manufacturing the optical film of the present invention by the extrusion method will be described as follows.

The optical film of the present invention comprises a first step of preparing a master batch by mixing a green organic phosphor having a PL wavelength of 500 to 550 nm in a monomolecular form and a transparent resin; A second step of putting the master batch in an extruder and then melting it; 3) extruding the molten master batch into a continuous phase; And 4) a step of calendering and quenching the continuous extrudate to produce a film. The optical film may be produced by a process comprising the steps of:

And may further include a red organic phosphor having a PL wavelength of 600 to 680 nm in a monomolecular form in the production of the masterbatch in the first step.

The kind of the organic phosphor used in the master batch production in the first step, its content, the kind of the transparent resin, and the like are the same as those described above. In addition, in the production of the master batch in the first step, the beads described above in addition to the organic fluorescent substance and the transparent resin; Other dyes including at least one selected from polymer dots and dyes; And at least one selected from the above additives may be further mixed to prepare a highly concentrated masterbatch.

When the additive is added, the additive may be added in an amount of 1 to 60 parts by weight, preferably 1 to 20 parts by weight based on 100 parts by weight of the transparent resin. And when it exceeds 60 parts by weight, the dispersibility of the organic phosphor may be deteriorated.

Step 2 is a step of melting the master batch to extrude the master batch. In this case, a general extruder may be used depending on the structure of the optical film to be manufactured, or an optical film having a multilayer structure may be manufactured using a co-extruder. The melting is preferably performed at a temperature of 250 ° C to 320 ° C, preferably 260 ° C to 320 ° C, wherein the melting temperature is less than 250 ° C, The mechanical properties of the resulting film may be uneven. If the temperature exceeds 320 ° C, thermal deformation of the polymer may occur, resulting in deterioration or carbonization, and loss of functionality due to modification and decomposition of the additive It is preferable to melt the master batch in the above-mentioned temperature range.

Step 4 is a calendering process for filming a continuous extruded or coextruded extrudate in Step 3, and the calendering can be calendared by a general method used in the art, Calendering can be performed while quenching the continuous extrudate using a calender roll at a temperature of ~ 140 ° C.

If the transparent resin used in the master batch is a PET resin, the step 4 may further include a step of stretching the calendered and quenched film and then thermally fixing it to secure reliability. In this case, the stretching method may be a general method used in the art. For example, the stretched film may be stretched by 2 to 6 times, preferably 3 to 5 times, in the MD and / or TD directions It is advantageous in terms of securing the reliability of the color-compensated extrusion optical film.

The method may further include a fifth step of forming a surface structure on the surface of the film prepared in step 4; Process. ≪ / RTI > At this time, the surface structure may be formed by a general method used in the art. For example, a roll-to-roll printing method or an imprinting method may be used to form the surface structure. A surface structure can be formed on one surface or both surfaces. The shape of the surface structure is not particularly limited. For example, a surface structure such as a prism pattern, a semicircular pattern, a wave pattern, a polygonal pattern, a lenticular pattern, a microlens pattern, an embossing pattern, .

The organic fluorescent material of the present invention and the optical film produced using the organic fluorescent substance of the present invention may be prepared or combined with a prism film, a diffusion film, a light guide plate, a reflective polarizer, or the like to produce R, G, (LED) display device, a light emitting diode (LED) lighting device, and / or a liquid crystal display device (LCD).

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the following examples.

[ Example ]

Example  1: Green system  Preparation of Organic Phosphor

 (1) Preparation of the compound represented by the formula (a)

Perylene-3,4,9,10-tetracarboxylic dianhydride (25.49 mmol, 10 g) and iodine (iodine, 4.33 mmol, 1.1 g) were placed in a three-necked flask, Chlorosulfonic acid (40 ml) was added in the atmosphere.

Next, the reaction was carried out by raising the temperature to 70 ° C and heating and stirring for 20 hours. After completion of the reaction, the temperature was slowly cooled to 24 ° C to 25 ° C, and then cold water was slowly added to the cooled reaction solution A precipitate was formed.

Next, the precipitate was filtered, washed with water, and then dried to obtain an orange solid represented by the following formula (a).

^{1 H-NMR (d- DMSO,} ppm): 8.75 (s, 4H).

¹³ C-NMR (d- DMSO , ppm): 119.75, 125.29, 129.5, 134.88, 136.22, 158.16, 168.53

(A)

(2) Synthesis of Compound Represented by Formula b

(18.86 mmol, 10 g) was added to a three-necked flask and CH ₃ CN (0.06 M, 310 ml), 1-bromo-2-methylpropane 269.88 mmol, 30 ml), 2-methyl-1-propanol (324.39 mmol, 30 ml) and DBU (182.94 mmol, 27.3 ml) were added in this order and refluxed for 12 hours.

Next, after the completion of the reaction, the temperature was lowered to 24 to 25 DEG C, methanol was added thereto, stirred, and filtered to obtain a solid.

Next, after the solid was subjected to hot-air drying, the dried solid was subjected to silica column to obtain a yellow solid which was a compound represented by the following formula (b).

^{1 H-NMR spectrum (300 MHz} , CDCl 3): δ (ppm) = 8.09 (s, 4H), 4.15 (m, 8H), 2.14 (m, 4H), 1.05 (d, 24H)

^{_{13 C NMR (CDCl 3, ppm}} ): 166.2, 131.6, 128.6, 128.2, 127.9, 127.6, 124.4, 74.4, 27.7, 19.4

 [Formula b]

(3) Synthesis of Compound Represented by Formula 1-1

(12.65 mmol, 10 g) and K ₂ CO ₃ (126.5 mmol, 17.5 g) were placed in a three-necked flask, and NMP (0.06M, 210 ml) was added in a nitrogen atmosphere and stirred.

Next, phenol (126.5 mmol, 11 ml) was added and stirred and reacted at 140 캜 for about 30 hours. After the reaction was completed, the temperature was decreased from 24 ° C to 25 ° C, 1N HCl was added, and precipitates were formed.

The precipitate was filtered, washed with water, and then dried with hot air. The dried solid was subjected to silica column chromatography to obtain a yellowish orange solid (yield: 70%).

It was confirmed by ¹ H-NMR and ¹³ C NMR measurements that the compound was represented by the following formula 1-1.

^{1 H-NMR spectrum (300 MHz} , CDCl 3): δ (ppm) = 8.24 (s, 4H), 7.21 (m, 8H), 6.97 (m, 4H), 6.91 (m, 8H), 4.21 (d, 8H), 2.42 (m, 4H), 1.01 (d, 24H)

¹³ C NMR ( CDCl ₃ , ppm): 166.3, 157.4, 149.9, 131.7, 128.7, 126.9, 123.1, 122.7, 121.9, 117.7, 115.2, 75.4, 27.7, 19.4

 [Formula 1-1]

이고, n은 0이다.In Formula 1-1, R ¹ is an isobutyl group (isobutyl group), and an A, B, C and D is -OR ^2, R ² is

And n is zero.

Example  2: Green system  Preparation of Organic Phosphor

The compound represented by formula (b) was prepared in the same manner as in Preparation Example 1,

(12.65 mmol, 10 g) and K ₂ CO ₃ (126.5 mmol, 17.5 g) were placed in a three-necked flask, and NMP (0.06M, 210 ml) was added in a nitrogen atmosphere and stirred.

Then, 4-tetra-butylphenol (126.5 mmol, 19 g) was added thereto, and the mixture was stirred and reacted at 140 ° C for about 30 hours. After the reaction was completed, the temperature was decreased from 24 ° C to 25 ° C, 1N HCl was added, and precipitates were formed.

The precipitate was filtered, washed with water, and then dried with hot air. The dried solid was subjected to silica column chromatography to obtain an orange solid (yield: 68%) as a yellowish color.

It was confirmed by ¹ H-NMR and ¹³ C NMR measurements that the compound was represented by the following formula (1-2).

^{1 H-NMR spectrum (300 MHz} , CDCl 3): δ (ppm) = 8.25 (s, 4H), 7.25 (d, 8H), 6.84 (d, 8H), 4.21 (d, 8H), 2.43 (m, 4H), 1.34 (s, 36H), 1.O1 (d, 24H)

¹³ C NMR ( CDCl ₃ , ppm): 166.1, 153.9, 149.9, 143.1, 131.7, 126.9, 124.8, 123.2, 122.7, 117.1, 115.2, 74.4, 40.7, 31.4, 27.7, 19.4

 [Formula 1-2]

이다.Wherein R ¹ is an isobutyl group, A, B, C and D are -OR ² , and R ² is

to be.

Example  3: Green system  Preparation of Organic Phosphor

The compound represented by formula (b) was prepared in the same manner as in Preparation Example 1,

(12.65 mmol, 10 g) and K ₂ CO ₃ (126.5 mmol, 17.5 g) were placed in a three-necked flask, and NMP (0.06M, 210 ml) was added in a nitrogen atmosphere and stirred.

Next, 2,4,6-trimethylphenol (126.5 mmol, 17.2 g) was added thereto, and stirred and reacted at 140 ° C for about 30 hours. After the reaction was completed, the temperature was decreased from 24 ° C to 25 ° C, 1N HCl was added, and precipitates were formed.

The precipitate was filtered, washed with water, and then dried with hot air. The dried solid was subjected to silica column chromatography to obtain an orange solid (yield 69%) as a yellowish color.

It was confirmed by ¹ H-NMR and ¹³ C NMR measurements that the compound was represented by the following formula 1-3.

^{1 H-NMR spectrum (300 MHz} , CDCl 3): δ (ppm) = 8.27 (s, 4H), 6.64 (s, 8H), 4.20 (d, 8H), 2.45 (m, 4H), 2.37 (s, 36H), 1.03 (d, 24H)

¹³ C NMR ( CDCl ₃ , ppm): 165.9, 149.9, 147.1, 131.7, 131.3, 127.6, 127.5, 126.9, 123.2, 122.7, 115.2, 74.4, 27.7, 24.9,

 [Formula 1-3]

이다.In Formula 1-3, R ¹ is isobutyl group, A, B, C and D are -OR ² , R ² is

to be.

Example  4: Green system  Preparation of Organic Phosphor

The compound represented by formula (b) was prepared in the same manner as in Preparation Example 1,

(12.65 mmol, 10 g) and K ₂ CO ₃ (126.5 mmol, 17.5 g) were placed in a three-necked flask, and NMP (0.06M, 210 ml) was added in a nitrogen atmosphere and stirred.

Next, phenol (126.5 mmol, 11 ml) was added thereto, and the mixture was stirred and reacted at 90 캜 for about 30 hours. After the reaction was completed, the temperature was decreased from 24 ° C to 25 ° C, 1N HCl was added, and precipitates were formed.

The precipitate was filtered, washed with water, and then dried with hot air. The dried solid was subjected to silica column chromatography to obtain an orange solid (yield: 71%) as a yellowish color.

It was confirmed by ¹ H-NMR and ¹³ C NMR measurements that the compound was represented by the following formula (1-4).

^{1 H-NMR spectrum (300 MHz} , CDCl 3): δ (ppm) = 8.60 (s, 2H), 8.25 (s, 2H), 7.22 (m, 8H), 6.98 (t, 4H), 6.92 (d, 8H), 4.21 (d, 8H), 2.43 (m, 4H), 1.01 (d, 24H)

¹³ C NMR ( CDCl ₃ , ppm): 166.5, 157.0, 149.9, 131.7, 131.6, 128.6, 128.5, 127.9, 127.6, 125.7, 123.5, 121.9, 117.5, 115.2, 74.4, 27.7, 19.4

 [Formula 1-4]

이고, n은 0이며, B 및 C는 -Cl이다.In Formula 1-4, R ¹ is isobutyl group, A and D are -OR ² , and R ² is

, N is 0, and B and C are -Cl.

Comparative Example  One

(1) Preparation of the compound represented by the formula c

In a three-necked flask, perylene-3,9-dicarboxylic acid (9.2 g, 27.03 mol) and isobutyl alcohol (50 ml) were added and stirred at 65 ° C for 3 hours, . After completion of the reaction, the temperature was lowered to 24 ° C to 25 ° C, and MeOH (500 ml) was added thereto. The resulting precipitate was filtered, and the precipitate was washed with cold MeOH.

Next, the washed material was dried in a vacuum oven to obtain a yellow solid (9.6 g, 78%), which was confirmed to be a compound represented by the following formula (c).

¹ H-NMR ( 300 MHz , CDCl ₃ ) :? (Ppm) = 8.19 (d, 2H), 7.96-91 (m, 4H), 7.39 (m, 4H) , ≪ / RTI > 2H), 0.91 (d, 12H)

^{_{13 C NMR (CDCl 3, ppm}} ): 167.9, 139.1, 129.8, 128.8, 128.1, 127.1, 126.9, 125.3, 124.4, 122.8, 120.2, 70.8, 27.6, 19.4

(C)

(2) Preparation of the compound represented by the formula (d)

(9.6 g, 21.22 mol), N-bromosuccinimide (7.85 g, 44 mol) and CH ₂ Cl ₂ were added to a three-necked flask and stirred (TLC terminated) .

Next, after completion of the reaction, the solution was removed with an evaporator, and a column was obtained to obtain a solid, which was confirmed to be a compound represented by the following formula (d).

^{1 H-NMR spectrum (300 MHz} , CDCl 3): δ (ppm) = 8.21 (d, 2H), 7.99 (d, 2H), 7.82 ~ 77 (m, 4H), 4.01 (d, 4H), 1.95 ( m, 2H), 0.90 (d, 12H)

¹³ C NMR ( CDCl ₃ , ppm): 167.7, 133.0, 129.7, 128.9, 128.1, 128.0, 127.9, 126.8, 126.1, 124.2, 120.0, 70.9, 27.7, 19.6

[Chemical formula d]

(3) Preparation of the compound represented by the general formula (5)

(12 parts by weight), copper cyanide (9 parts by weight) and sulfolane (100 parts by weight) were placed in a three-necked flask and stirred at 130 ° C to 140 ° C for 25 hours, Lt; / RTI > Next, after the reaction was completed, distilled water (H ₂ O, 400 parts by weight) was slowly added thereto, and a precipitate was formed.

Next, the precipitate was obtained by filtering with diluted ammonia, which was then washed with distilled water and dried.

Next, Br containing 1.2% of the dried material was extracted with toluene (9 parts by weight) and then purified with a silica gel column (trichloroethane / ethanol) to obtain an orange solid (yield: 61%) represented by the formula 5 .

^{1 H-NMR (300 MHz,} CDCl 3): δ (ppm) = 8.20 (d, 2H), 8.03 ~ 7.96 (m, 4H), 7.87 (d, 2H), 4.04 (d, 4H), 1.98 (m , ≪ / RTI > 2H), 0.92 (d, 12H)

^{_{13 C NMR (CDCl 3, ppm}} ): 167.9, 137.5, 130.4, 129.8, 127.4, 126.9, 125.7, 125.4, 125.3, 124.4, 117.1, 71.1, 27.9, 19.7

[Chemical Formula 5]

Comparative Example  2

(Perylene-3,4,9,10-tetracarboxylic dianhydride, 25.49 mmol, 10 g) was added to a three-necked flask and CH ₃ CN (0.06M, 424 ml) 2-methylpropane (364.75 mmol, 40 ml), 2-methyl-1-propanol, 438.43 mmol, 40 ml), DBU (247.25 mmol, 37 ml) were added in this order and refluxed for 12 hours.

Next, after the completion of the reaction, the temperature was lowered to 24 to 25 DEG C, methanol was added thereto, stirred, and filtered to obtain a solid.

Next, the solid was subjected to hot-air drying, and the dried solid was subjected to silica column to obtain an orange solid (yield: 93%) represented by the following formula (6).

^{1 H-NMR (300 MHz,} CDCl 3): δ (ppm) = 8.25 (d, 4H), 8.03 (d, 4H), 4.11 (d, 8H), 2.12 (m, 4H), 1.03 (d, 24H )

^{_{13 C NMR (CDCl 3, ppm}} ): 168.5, 133.0, 130.5, 130.3, 129.0, 128.8, 121.4, 71.5, 27.9, 19.4

[Chemical Formula 6]

Experimental Example  1: UV absorption wavelength of the organic phosphor and PL  Wavelength measurement experiment

(1) UV absorption wavelength measurement

0.01 g of each of the organic phosphors of the Examples and Comparative Examples was dissolved in 3 ml of toluene and placed in a test tube to measure the emission spectra according to the UV absorbance. The results are shown in Table 1 below.

UV absorbance The UV absorbance was measured using a UV spectrometer (VARIAN, CARY 100 Conc.).

(2) PL (photoluminescence) measurement

PL spectra were measured using DarsaPro5200OEM PL (PSI Trading Co.) and 500W ARC Xenon Lamp, respectively, and the results are shown in Table 1 below.

division UV absorption wavelength
(nm) PL wavelength measurement
(nm) Example 1 506 539 Example 2 510 543 Example 3 507 540 Example 4 501 537 Comparative Example 1 475 527 Comparative Example 2 476 528

Manufacturing example  One: Extrusion process  through Color compensation film  Produce

A green batch organic phosphor represented by Formula 1-1 prepared in Example 1 was compounded in a high concentration in a polycarbonate (PC) resin having an MI of 10 to prepare a master batch. At this time, the masterbatch was prepared so that the green-based organic phosphor of Preparation Example 1 in the master batch had a concentration of 3,500 ppm.

Next, the master batch and the PC resin (base resin) were fed in a 1: 9 weight ratio using a feeding device to a 300 psi L / D 30 twin squirrel type extruder, and then 280 , Extruded into a continuous phase so that the resin can be dispersed in a molten state, and the extrudate is calendered and quenched in a 130 calender roll to obtain a color compensation film of a single layer structure having an average thickness of 300 占 퐉 A phosphor content of 350 ppm).

Manufacturing example  2

An optical film was produced in the same manner as in Production Example 1 except that the green-based organic phosphor represented by Formula 1-2 prepared in Example 2 was used instead of the green-based phosphor in Example 1, Was prepared.

Manufacturing example  3

An optical film was prepared in the same manner as in Production Example 1 except that the green-based organic phosphor represented by Formula 1-3 prepared in Example 3 was used instead of the green-based phosphor of Example 1 to obtain a single layer structure having an average thickness of 300 m A color compensation film was prepared.

Manufacturing example  4

An optical film was prepared in the same manner as in Preparation Example 1 except that the green-based organic phosphor represented by the general formula (1-4) prepared in Example 3 was used instead of the green-based phosphor of Example 1 to obtain a single layer structure A color compensation film was prepared.

Comparative Manufacturing Example  One

An optical film was produced in the same manner as in Production Example 1 except that the organic fluorescent substance represented by Chemical Formula 5 prepared in Comparative Example 1 was used instead of the green fluorescent substance of Example 1 and a color compensation film having a single- .

Comparative Manufacturing Example  2

An optical film was produced in the same manner as in Production Example 1 except that the organic fluorescent substance represented by Chemical Formula 6 prepared in Comparative Example 2 was used instead of the green fluorescent substance of Example 1 and a color compensation film having a single- .

Experimental Example  2 : Color compensation  Measurement of physical properties of optical film

The PL intensity change, the luminance change rate, the light stability, the thermal decomposition analysis, the dispersibility (luminance uniformity), the mass productivity and the high temperature and high humidity stability of the color compensation film prepared in the above Production Examples and Comparative Production Examples were measured by the following methods, The results are shown in Table 2 below.

(One) PL  Experiment to measure the rate of change

The optical films of Production Examples and Comparative Production Examples were fixed on Blue LED BLU having a center wavelength of 450 nm and then the maximum PL peak intensity change amount after 0 hours and 120 hours was measured using KONICA MINOLTA CL-500A. The results of PL intensity change measurement are shown in Fig.

(2) Experiment to measure luminance change rate

The optical films of Production Examples and Comparative Production Examples were constituted by fixing a diffusion film and a prism reflective polarizing film on a blue LED BLU having a center wavelength of 450 nm and then fixing the entire screen area to 12 points by using an SR3 luminometer of Japan TOPCON Co., And the change rate of luminance of each point with time was measured.

At this time, the rate of change in luminance is the rate of change measured based on the luminance value at the initial measurement of 100%.

FIG. 2 shows the results of the measurement of the rate of change in luminance over time in Production Example 1, and FIG. 3 shows the results of measurement of the rate of change in luminance over 12 hours in Production Example 1, Comparative Production Example 1 and Comparative Production Example 2.

(3) Light stability  Measurement experiment

By measuring the color range that can be expressed by the liquid crystal display device with the TFT panel mounted on the BLU module, it is possible to measure the color coordinates and luminance of the red, green, and blue states, have. The area of the triangle can be calculated by connecting the color coordinates of each of R, G, B of the light emitted through the BLU including the blue LED. The color recall ratio is calculated by comparing the above area with the area of the NTSC (International TV Standards Committee) Can be calculated.

The color compensation films of the production examples and the comparative production examples were mounted on a BLU module on which a TFT was mounted, and the color deviation (x, y) after driving at room temperature for 120 hours was measured to evaluate the degree of change of the color coordinates x and y , And CA-310 of KONICA MINOLTA, Japan were used.

 (4) Thermal decomposition measurement experiment

The color compensating optical film was evaluated by measuring the temperature (T _d ) at which the weight loss was 5% while heating by using a thermogravimetric analysis (TGA).

(5) Measurement experiment of dispersibility (luminance uniformity)

The SR3 camera of TOPCON Co., Ltd. was used to measure the brightness of 9 points over the entire area of the backlight, and the difference between the maximum value and the minimum value was compared and evaluated.

(6) Mass production (workability) measurement experiment

The productivity was measured by integrating the handling from the preparation of the raw material to the final product and the complexity in the process yield process. The evaluation criteria were as follows: ⊚: very excellent, ◯: excellent, △: normal,

(7) High Temperature and Humidity Stability (WHTS, Wet High Temperature Storage)

After assembling the BLU module in the same way as the optical stability measurement, the blue screen was driven for 500 hours in a chamber of relative humidity 60% and 75, and the uniformity of the whole screen and the stain phenomenon due to film deformation were qualitatively evaluated , Evaluation criteria were as follows:?: Very good,?: Good,?: Poor, and X: not used.

division Production Example 1 Production Example 2 Production Example 3 Production Example 4 Comparative Preparation Example 1 Comparative Production Example 2 Organic phosphor (1-1) The
1-2 1-3 The
1-4 Formula 5 6 PL maximum peak value 539 543 540 537 527 528 After 120 hours
PL maximum peak
Rate of change (%) 0.01% 0.3% 0.4% 0.04% 10% 8% Initial brightness (Nit) 225 226 228 227 226 228 After 12 hours, the luminance change rate 0.03% 0.2% 0.3% 0.05% 4% 3% Gwangan
Qualitative ΔX 0.0007 0.0008 0.0010 0.0004 0.0010 0.0019 Y 0.0003 0.0004 0.0007 0.0003 0.0052 0.0041 T _d 5 wt% 314 ° C 316 ° C 321 DEG C 311 ℃ 330 ℃ 312 ° C Dispersibility 92.5% 91.7% 92.4% 91.5% 89.8% 91.0% Mass production property ◎ ◎ ◎ ◎ ◎ ◎ WHTS ◎ ◎ ◎ ◎ △ △

As a result of the test results of Table 2, it can be seen that, in the case of Production Examples 1 to 4, it has a low PL peak intensity change rate (see FIG. 1) and a rate of luminance change (see FIG. 2). However, in Comparative Production Example 1 and Comparative Production Example 2, the peak intensity change rate was large. Referring to FIG. 3, in Comparative Production Example 1 and Comparative Production Example 2, the luminance was lowered after 12 hours, The rate of change was large.

Further, in the case of Production Examples 1 to 3, it was confirmed that the color deviation (x, y) range was 0.0020 or less in both the x-coordinate and the y-coordinate, and the light stability was excellent. On the other hand, in Comparative Production Example 1 and Comparative Production Example 2, there was a problem that the y-coordinate is 0.0040 or more and the color deviation is very large.

In addition, in Production Examples 1 to 4, the dispersibility, the mass productivity, and the high temperature and humidity stability were all excellent.

It can be seen from the above Examples and Experiments that the present invention can produce a color compensation optical film with excellent mass productivity through an extrusion process in spite of using an organic fluorescent material, It was confirmed that one optical film had excellent optical properties and thermal properties. By using the color-compensated extruded optical film of the present invention, it is possible to provide an LED light, an LED display, an LCD, etc. having excellent color reproducibility .

Claims (15)

1. An organic fluorescent substance for an optical film, which is an organic fluorescent substance having a PL wavelength in a monomolecular form of 500 to 550 nm, the compound being represented by the following formula (1);
[Chemical Formula 1]

In the formula 1, wherein R ¹ is a straight-chain alkyl group or branched alkyl group of C3 ~ C10 ~ C10 of the C3, A, B, C and D each independently represent a halogen atom or an -OR ^2, R ² is C3 ~ C10 straight-chain alkyl group, C3-C10 branched alkyl group, C5-C10 cycloalkyl group,

or

R ³ is a straight-chain alkyl group having 1 to 4 carbon atoms or a branched alkyl group having 3 to 6 carbon atoms, and n is 0 to 3.
The organic fluorescent substance for an optical film according to claim 1, wherein R ¹ in the formula (1) is a straight-chain alkyl group having from 3 to 5 carbon atoms or a branched alkyl group having from 3 to 5 carbon atoms.
2. The compound according to claim 1, wherein each of A, B, C and D in Formula 1 is independently a halogen atom or -OR ² , and R ² is

or

, R ³ is -CH ₃ , -CH ₂ CH ₃ , -C (CH ₃ ) ₃ or -CH (CH ₃ ) ₂ , and n is 0 to 3.
4. The compound according to claim 3, wherein A and D in Formula 1 are -OR ² , and R ² is

, N is 0, and B and C are -F or -Cl.
The organic phosphor for an optical film according to claim 1, wherein the compound has a specific gravity of 1.0 to 2.0 g / cm 3 and a thermal decomposition temperature of 270 ° C or more.
An optical film comprising the organic phosphor according to any one of claims 1 to 5.
The optical film according to claim 6, wherein the optical film is a color compensation film.
7. The organic electroluminescent device according to claim 6, wherein the organic phosphor; And a transparent resin, wherein the master batch is an extruded film,
The transparent resin may be a resin such as polycarbonate resin, polyethylene terephthalate resin, polymethyl methacrylate (PMMA), co-polymethyl methacrylate (co-PMMA), acrylonitrile-butadiene-styrene And a transparent resin comprising at least one selected from the group consisting of polystyrene (PS) resins.
The optical film according to claim 8, wherein the extruded film is a single layer structure or a multilayer structure in which a plurality of the extruded films are laminated.
The optical film according to claim 6, further comprising an organic phosphor having a PL wavelength of 600 to 680 nm.
The color difference measuring method according to claim 6, characterized in that a deviation range of the x-coordinate is 0.0001 to 0.0020 and a y-coordinate deviation range is 0.0001 to 0.0020 in measuring the color deviation based on the National Television System Committee (NTSC) color coordinates under a blue light source .
The optical film according to claim 6, wherein a temperature (T _d ) at which a weight loss of 5% is lost is at least 300 ° C when measuring a temperature at which a weight loss of 5% is measured using a thermogravimetric analyzer (TGA).
A light emitting diode (LED) display comprising the optical film of claim 6.
A light emitting diode (LED) illumination device comprising the optical film of claim 6.
A liquid crystal display (LCD) comprising the optical film of claim 5.

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