KR102113537B1 - Ultraviolet absorbing encapsulant for light emitting device and light emitting device including the same - Google Patents

Abstract

The present invention relates to an ultraviolet absorbing encapsulant for a light emitting device, capable of improving the physical and lifespan properties of a light emitting device, and a light emitting device including the same. According to the present invention, the ultraviolet absorbing encapsulant for a light emitting device comprises an indole-based derivative compound represented by chemical formula 1. In the chemical formula 1, each of R_1 and R_4 to R_7 is any one independently selected from the group consisting of hydrogen, a hydroxy group, a halogen group, a C1-C5 alkyl group, and a C1-C5 alkoxy group.

Description

Ultraviolet absorbing encapsulant for light emitting device and light emitting device including the same}

The present invention relates to a sealing material used to prevent deterioration of a light emitting device, and more particularly, by applying an indole-based compound having a UV blocking function as a sealing material, it is possible to improve the physical properties and life characteristics of the light emitting device It relates to a UV absorbing encapsulant for a light emitting device and a light emitting device comprising the same.

A light emitting device, especially an organic light emitting device (OLED), is a self-emission type device having a wide viewing angle, excellent contrast, a fast response time, and excellent luminance, driving voltage, and response speed characteristics. It has the advantage that it can be multicolored, and is widely used in a wide variety of fields.

However, when such an organic light emitting device is exposed to oxygen, moisture, and ultraviolet rays, a problem that physical properties and lifespan are reduced due to deterioration occurs, and thus sealing means that can protect the organic light emitting element from oxygen, moisture, and ultraviolet rays. It must be introduced into the device. In particular, since the light emitting device has no choice but to be exposed to light in use, it must also have light resistance and heat resistance.

In this connection, in the art, benzophenone, benzotriazole, triazole, triazine, salicylate, and cyanoacrylate ), UV-absorbing agents such as oxanilide, hindered amine, and metal complexing agents (light stabilizers) have been studied to prevent device damage from UV. Not many documents have been published.

However, since these UV absorbers mainly absorb only the UV in the 260 to 380 nm region, there is a problem in that UV in the higher region (eg, 380 to 430 nm) cannot be blocked. Therefore, it is required to develop an encapsulant for a light emitting device capable of completely absorbing and blocking UV rays in the region of 260 to 380 nm or more and preventing damage from UV.

Accordingly, an object of the present invention, by applying an indole-based compound having an ultraviolet ray blocking function and excellent heat and light resistance as a sealing material, an ultraviolet absorbing sealing material for a light emitting device capable of improving physical properties and life characteristics of the light emitting device and the same It is to provide a light emitting device comprising.

In order to achieve the above object, the present invention comprises an indole-based derivative compound represented by the following formula (1), ultraviolet light for a light emitting device characterized in that it has an initial transmittance of the following formula 1 and a light / heat resistance transmittance of the following formula 2 Provide an absorbent encapsulant.

[Formula 1]

[Equation 1]

[Equation 2]

In Chemical Formula 1, R ₁ and R ₄ to R ₇ are each independently selected from the group consisting of hydrogen, a hydroxy group, a halogen group, an alkyl group having 1 to 5 carbon atoms, and an alkoxy group having 1 to 5 carbon atoms, and R ₂ And R ₃ are each independently a linear, branched or cyclic hydrocarbon group having 4 to 10 carbon atoms, which may or may not contain any one or more of nitrogen and oxygen atoms, and in Formulas 1 and 2, T ⁰ is It is the initial transmittance at the wavelength, and T ¹ is the transmittance after light exposure at the wavelength.

In addition, the present invention provides a light-emitting element comprising the ultraviolet absorbing encapsulant for the light-emitting element.

The ultraviolet absorbent encapsulant for a light emitting device according to the present invention and the light emitting device including the same, has an ultraviolet ray blocking function, and applies an indole compound having excellent heat resistance and light resistance as a sealing material, thereby improving physical properties and life characteristics of the light emitting device. It has the advantage of being able to.

Hereinafter, the present invention will be described in detail.

The ultraviolet absorbent encapsulant for a light emitting device according to the present invention includes an indole-based derivative compound represented by Formula 1 below, and is characterized by having an initial transmittance of Formula 1 and a light / heat resistance transmittance of Formula 2 below.

[Formula 1]

[Equation 1]

[Equation 2]

In Chemical Formula 1, R ₁ and R ₄ to R ₇ are each independently selected from the group consisting of hydrogen, a hydroxy group, a halogen group, an alkyl group having 1 to 5 carbon atoms, and an alkoxy group having 1 to 5 carbon atoms, and R ₂ And R ₃ are each independently a linear, branched or cyclic hydrocarbon group having 4 to 10 carbon atoms, which may or may not contain any one or more of nitrogen and oxygen atoms, and in Formulas 1 and 2, T ⁰ is It is the initial transmittance at the wavelength, and T ¹ is the transmittance after light exposure at the wavelength.

As described above, benzophenone-based, benzotriazole-based, triazole-based, triazine-based, and salicylate are used so far to block UV absorption of light-emitting elements ), UV absorbers such as cyanoacrylate, oxanilide, hindered amine, and metal complex (light stabilizers) were used. However, since these UV absorbers mainly absorb only the UV in the 260 to 380 nm region, there is a problem in that UV in the higher region (eg, 400 to 430 nm) cannot be blocked. Accordingly, the present applicant has invented an encapsulation material for a light emitting device capable of completely absorbing and blocking UV rays in the region of 260 to 380 nm or more and preventing damage from UV.

The reason why 405 nm was selected as the measurement wavelength in Equations 1 and 2 is that it has a characteristic of reducing reliability (yellowing element damage, etc.) in the vicinity of 400 nm, and it is necessary to block the corresponding part. Blue for maintaining RGB white balance and increasing transmittance (Blue) The transmittance in the wavelength range of 430 nm or higher should be high. That is, since it is important to absorb light around 400 nm that affects reliability and ensure transmittance at 430 nm or more, 405 nm is selected as the measurement wavelength as described above.

In Chemical Formula 1, R ₁ and R ₄ to R ₇ are each independently selected from the group consisting of hydrogen, a hydroxy group, a halogen group, an alkyl group having 1 to 5 carbon atoms, and an alkoxy group having 1 to 5 carbon atoms, R ₁ is preferably an alkyl group having 1 to 5 carbon atoms, more preferably a methyl group, and R ₄ to R ₇ are preferably hydrogen.

In addition, in Chemical Formula 1, R ₂ and R ₃ are each independently a linear, branched or cyclic hydrocarbon group having 4 to 10 carbon atoms, which may or may not contain any one or more of nitrogen and oxygen atoms, Preferably, R ₂ and R ₃ are each independently a phenyl group, or a cyano group (-CN group), an alkyl group, an alkoxy group, a carbonyl group, a carboxyl group, a hydroxyl group, an amide group, an ester group, an ether group, an acrylate group or a halogen group It is a saturated or unsaturated (or polymerizable group) hydrocarbon group containing any one or more.

,

,

,

,

,

,

,

,

,

및

등이 있으며(상기 예시들에서 굴곡선(

)은 연결부를 나타낸다), 이들 외에도 상기의 조건을 만족하는 치환기라면 특별한 제한 없이 적용될 수 있다. 또한, R₂ 및 R₃은 동일하거나 상이할 수 있으나 서로 다르게 적용하는 것이 바람직하고, 예를 들어, R₂ 및 R₃ 중 어느 하나가 페닐기이면, 다른 하나는 나머지 예시된 치환기 중 어느 하나일 수 있다.In Chemical Formula 1, specific examples of R ₂ and R ₃ are,

,

,

,

,

,

,

,

,

,

And

Etc. (in the above examples, the curve

) Denotes a connecting part), and any substituents satisfying the above conditions may be applied without particular limitation. Further, R ₂ and R ₃ may be the same or different, but are preferably applied differently, for example, if any one of R ₂ and R ₃ is a phenyl group, the other may be any one of the other illustrated substituents. have.

Therefore, as the indole derivative compounds according to the present invention to which the above substituents are applied, the compounds represented by the following formulas 1a to 1j and isomers thereof can be exemplified.

[Formula 1a]

[Formula 1b]

[Formula 1c]

[Formula 1d]

[Formula 1e]

[Formula 1f]

[Formula 1g]

[Formula 1h]

[Formula 1i]

[Formula 1j]

On the other hand, the ultraviolet absorber encapsulant for a light emitting device according to the present invention, in order to absorb UV of a wider range of wavelengths and to express a complementary effect with an indole-based compound, in addition to the indole-based compound, a benzophenone-based compound, tria Triazole-based compound, benzotriazole-based compound, triazine-based compound, salicylate-based compound, cyanoacrylate-based compound, oxanilide-based compound Compound, a hindered amine (hindered amine) compound and a metal complex salt-based compound (light stabilizer) may further include one or more UV absorbers. As described above, when a separate UV absorber is additionally included in addition to the indole-based compound, the content of the additional UV absorber may be 0.05 to 5 parts by weight based on 100 parts by weight of the indole-based compound. When the content of the additional UV absorber is less than 0.05 parts by weight based on 100 parts by weight of the indole-based compound, the blocking rate effect may be insignificant, and when it exceeds 5 parts by weight, viscosity of the crude liquid increases and precipitation occurs, and long-term crude liquid stability decreases. Can be.

Meanwhile, the ultraviolet absorbent encapsulant for a light emitting device according to the present invention may include a monofunctional acrylate monomer, a polyfunctional acrylate monomer, and a reaction initiator in addition to the UV absorbers (including indole compounds).

The monofunctional acrylate monomer includes one acrylate functional group, benzyl methacrylate, 2-hydroxyethyl methacrylate, 4-hydroxybutyl methacrylate, and 2-hydroxypropyl methacrylate , 2-hydroxybutyl methacrylate, 6-hydroxyhexyl methacrylate, 1,4-cyclohexanedimethanol monomethacrylate, 1-chloro-2-hydroxypropyl methacrylate, diethylene glycol monomethacrylate Acrylate, 1,6-hexanediol monomethacrylate, 2-hydroxy-3-phenoxypropyl methacrylate, 4-hydroxycyclohexyl methacrylate, 2-hydroxy-3-phenoxybutyl methacrylate Rate, 4-hydroxycyclohexyl methacrylate, and mixtures including two or more of them.

The polyfunctional acrylate monomer includes two or more acrylate functional groups, and at the same time, may include a polycyclic alicyclic skeleton or a polycyclic aromatic skeleton, diphencarritriol hexaacrylate, triethylene glycol di (meth) Acrylates, tricyclodecane dimethanol di (meth) acrylate, isobornyl dimethanol di (meth) acrylate, dicyclopentenyl dimethanol di (meth) acrylate, and mixtures including two or more of these may be exemplified, It is not limited to this.

In addition, the reaction initiator is diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (diphenyl (2,4,6, -trimethylbenzoyl) phosphine oxide), having the same or similar properties (i.e., 365 to Reaction initiators having a light absorption wavelength range at 400 nm) and mixtures including two or more of them, but are not limited thereto.

 On the other hand, with respect to the content of each component constituting the encapsulant, with respect to the total weight of the encapsulant, the content of the UV absorber (including the indole-based compound) is 0.5 to 9% by weight, preferably 1 to 7% by weight %, The content of the monofunctional acrylate monomer is 3 to 95% by weight, preferably 40 to 80% by weight, the content of the polyfunctional acrylate monomer is 3 to 95% by weight, preferably 15 to 60% by weight, The content of the initiator may be 0.1 to 5% by weight, preferably 1 to 3% by weight. However, each of these contents is only optimized for the present invention and is not limited to the above numerical range, and there is no particular limitation on the content of each component constituting the encapsulant as long as the object of the present invention can be achieved.

In addition, the ultraviolet absorbent encapsulant for a light emitting device according to the present invention may further include one or more additives selected from the group consisting of antioxidants, thermal stabilizers, surfactants, leveling agents and antifoaming agents. In this case, the additive can be used without limitation within a limit that does not inhibit the expression of the effect by the indole-based compound.

On the other hand, the ultraviolet absorbent encapsulant for a light emitting device according to the present invention is excellent in heat / light resistance under light or heat conditions as well as ultraviolet light (especially UV in the wavelength range of 405 to 430 nm), thereby preventing deterioration in physical properties of the light emitting device. It is possible to improve the life characteristics of the light emitting device. The ultraviolet absorbent encapsulant for a light-emitting device of the present invention has an initial transmittance of Equation 1 below and a light / heat resistance transmittance of Equation 2 below.

[Equation 1]

[Equation 2]

In Equations 1 and 2, T ⁰ is an initial transmittance at a corresponding wavelength, and T ¹ is a transmittance after light exposure at a corresponding wavelength.

The ultraviolet absorbent encapsulant for a light emitting device of the present invention should basically satisfy Equation 1 (if the transmittance is 20% or less at 405 nm, it is all included in the Equation 1), and after light / heat resistance (light resistance, heat resistance), Equation 2 must be satisfied at the same time (if there are many changes at 405 nm after reliability, the light / heat resistance transmittance exceeds 10%).

Here, the initial UV transmittance of the UV absorbing encapsulant for a light emitting device according to the present invention may be, for example, 60 to 100%, preferably 80 to 95%, as shown in Equation 1 above at a wavelength of 405 to 430 nm. .

In addition, the light transmittance (light resistance), for example, through the UV treatment experiment according to KS C IEC 61646 standard (280 nm ~ 400 nm) to test the degree of deterioration depending on the case of exposure to sunlight, before and after exposure It can be confirmed by measuring the change in permeability. At this time, by applying a 2,500 W xenon arc lamp can be measured under the conditions of light exposure at 60 ℃, 15 kwh / m ² by the standard, the light resistance under the conditions must satisfy 10% or less as shown in Equation 2 above , Preferably 7% or less. At this time, the failure to satisfy 10% or less means that the blocking performance of 405 nm is reduced by light exposure, so that the life of the device may be shortened in this case.

In addition, the heat resistance transmittance (heat resistance), for example, can be measured under conditions of heating for 500 to 1,000 hours at a temperature of 120 ℃, the heat resistance under the conditions thereof is 10% or less, preferably as shown in the formula (2) It can be less than 7%. Meanwhile, in Formula 2, for convenience of description, the term light-resistant / heat-resistant transmittance is used, and it is specified that the light-resistant transmittance and the heat-resistant transmittance are applied to the same formula.

On the other hand, the present invention provides a light emitting device comprising the above-described ultraviolet absorbing encapsulant for the light emitting device. That is, the UV absorbing encapsulant according to the present invention is applicable to conventional light emitting devices such as a light emitting device (LED) and an organic light emitting device (OLED), and is damaged by light from outside in addition to being damaged by oxygen and moisture. It is preferable to apply to the organic light emitting device in consideration of the point that the life of the device decreases. In addition, the basic configuration of the light emitting element and the organic light emitting element excluding the encapsulant is generally applied.

In addition, briefly describing a method of manufacturing a light emitting device including the UV absorbing encapsulant, first, flash evaporation or inkjet printing (Ink-Jet printing), spin coating the UV absorbing encapsulant for the light emitting device After coating the LED or OLED through a coating method such as UV curing, and then molding it in the form of a sheet, etc., bonding with a substrate and heat curing, a light emitting device including an encapsulant can be manufactured.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely illustrative of the present invention, and it is apparent to those skilled in the art that various changes and modifications are possible within the scope and technical thought scope of the present invention. It is natural that such changes and modifications fall within the scope of the attached claims.

[Example 1] Preparation of UV absorbing encapsulant

To a three-necked flask with a stirrer, benzyl methacrylate monomer 56.87 wt%, polyfunctional acrylate monomer TRIMETHYLOLPROPANE TRIACRYLATE 37.92 wt%, initiator diphenyl (2,4,6, -trimethylbenzoyl) phosphine oxide 2.84 wt%, below After adding 2.37% by weight of the indole derivative compound represented by Chemical Formula 1a, the mixture was stirred for 5 hours at 550 rpm under a nitrogen atmosphere and a temperature of 50 ° C. The compound obtained through agitation was operated on a glass substrate using a spin coater (ACE-200, Donga Trading) for 23 seconds at a speed of 880 rpm, and then at a temperature of 25 ° C. with a 395 nm wavelength LED curing machine under a nitrogen atmosphere of 1,500 Cured to a light amount of mJ / cm ² , to prepare an ultraviolet absorbent encapsulant for a light emitting device having a thickness of 8 ㎛.

[Formula 1a]

[Example 2] Preparation of UV absorbing encapsulant

Except that the indole-based derivative compound of Formula 1a was changed to the indole-based derivative compound represented by Formula 1b below, it was performed in the same manner as in Example 1 to prepare an ultraviolet absorbent encapsulant for a light emitting device.

[Formula 1b]

[Example 3] Preparation of UV absorbing encapsulant

Except that the indole-based derivative compound of Formula 1a was changed to the indole-based derivative compound represented by Formula 1c below, the same procedure as in Example 1 was performed to prepare a UV absorbing encapsulant for a light emitting device.

[Formula 1c]

[Example 4] Preparation of UV absorbing encapsulant

Except for changing the indole derivative compound of Formula 1a to the indole derivative compound represented by Formula 1d below, it was performed in the same manner as in Example 1 to prepare a UV absorbing encapsulant for a light emitting device.

[Formula 1d]

[Example 5] Preparation of UV absorbing encapsulant

Except for changing the indole derivative compound represented by Formula 1a to the indole derivative compound represented by Formula 1e, the same procedure as in Example 1 was performed to prepare an ultraviolet absorbent encapsulant for a light emitting device.

[Formula 1e]

[Example 6] Preparation of UV absorbing encapsulant

Except that the indole-based derivative compound of Formula 1a was changed to the indole-based derivative compound represented by Formula 1f below, the same procedure as in Example 1 was performed to prepare an ultraviolet absorbent encapsulant for a light emitting device.

[Formula 1f]

[Example 7] Preparation of UV absorbing encapsulant

Except that the indole-based derivative compound of Formula 1a was changed to the indole-based derivative compound represented by Formula 1g below, it was performed in the same manner as in Example 1 to prepare an ultraviolet absorbent encapsulant for a light emitting device.

[Formula 1g]

[Example 8] Preparation of UV absorbing encapsulant

Except that the indole-based derivative compound of Formula 1a was changed to the indole-based derivative compound represented by Formula 1h below, it was performed in the same manner as in Example 1 to prepare an ultraviolet absorbent encapsulant for a light emitting device.

[Formula 1h]

[Example 9] Preparation of UV absorbing encapsulant

Except for changing the indole derivative compound of Formula 1a to the indole derivative compound represented by Formula 1i below, it was performed in the same manner as in Example 1 to prepare a UV absorbing encapsulant for a light emitting device.

[Formula 1i]

[Example 10] Preparation of UV absorbing encapsulant

Except that the indole-based derivative compound of Formula 1a was changed to the indole-based derivative compound represented by Formula 1j below, it was performed in the same manner as in Example 1 to prepare an ultraviolet absorbent encapsulant for a light emitting device.

[Formula 1j]

[Comparative Example 1] Preparation of encapsulant

Except that the indole derivative of Formula 1a was changed to a triazine-based UV absorber (BASF Tinuvin-460), the same procedure as in Example 1 was performed to prepare a sealing material for a light emitting device.

[Comparative Example 2] Preparation of encapsulant

Except that the indole-based derivative compound of Formula 1a was changed to a benzotriazole-based UV absorber (BASF Tinuvin-P), the same procedure as in Example 1 was performed to prepare a sealing material for a light emitting device.

[Comparative Example 3] Preparation of encapsulant

Except that the indole-based derivative compound of Formula 1a was changed to a benzophenone-based UV absorber (BASF Chimassorb-81), the same procedure as in Example 1 was performed to prepare a sealing material for a light emitting device.

[Test Example 1] Evaluation of the initial transmittance of the encapsulant for organic light emitting devices

Using the UV-Visible Spectrometer (UV-Visible Spectrometer, Evolution 600), the transmittance of the encapsulant specimens prepared in Examples 1 to 10 and Comparative Examples 1 to 3 was measured in a transmission mode of 300 to 800 nm. The results are shown in Table 1 below.

Initial transmittance (%) Example 1 89.3 Example 2 83.0 Example 3 76.2 Example 4 89.2 Example 5 92.4 Example 6 65.4 Example 7 91.3 Example 8 88.2 Example 9 89.3 Example 10 90.2 Comparative Example 1 2.9 Comparative Example 2 0.9 Comparative Example 3 1.3

As a result of evaluating the initial transmittance of the encapsulants prepared from Examples 1 to 10 and Comparative Examples 1 to 3, the encapsulants of Examples 1 to 10 to which the indole derivative compound of the present invention was applied, the encapsulants of Comparative Examples 1 to 3 Compared to this, it was confirmed that the initial transmittance was excellent, and through this, it was found that when the indole derivative compound of the present invention was applied to the encapsulant, light near 400 nm was well blocked.

[Test Example 2] Evaluation of light transmittance of the encapsulant for organic light emitting devices

Through the UV treatment experiment according to KS C IEC 61646 standard using a light-resistant tester (Daesong Labtech, Korea) (280 ~ 400 nm), the encapsulant prepared from Examples 1 to 10 and Comparative Examples 1 to 3 The change in transmittance before and after was measured by testing the degree of deterioration depending on the exposure to light. At this time, the light transmittance of each encapsulant was evaluated by light exposure at a temperature of 60 ° C. and a light amount of 15 kwh / m ² according to the specification using a 2,500 W xenon arc lamp, and the results are shown in Table 2 below.

[Test Example 3] Evaluation of heat transmittance of the encapsulant for organic light emitting devices

The encapsulants prepared from Examples 1 to 10 and Comparative Examples 1 to 3 were heated in an air state at a temperature of 120 ° C. for 500 hours using a high-temperature oven (Jeotech) to evaluate the heat-resistant transmittance of each encapsulant. The results are shown in Table 2 below.

Light transmittance (%) Heat transmittance (%) Example 1 4 3 Example 2 9 4 Example 3 9 2 Example 4 7 3 Example 5 2 One Example 6 10 4 Example 7 2 One Example 8 4 2 Example 9 4 2 Example 10 4 3 Comparative Example 1 -One One Comparative Example 2 -2 2 Comparative Example 3 -One -One

Through the results of evaluating the light resistance and heat resistance of the encapsulant prepared from Examples 1 to 10 and Comparative Examples 1 to 3 in Test Examples 2 and 3, Examples 1 to 10 of applying the indole derivative compound of the present invention The encapsulant was confirmed to have excellent short-wavelength, that is, a light blocking effect of 405 to 430 nm even after heat-resistant light.

Claims (10)

Contains an indole derivative compound represented by Formula 1 below,
A UV absorbing encapsulant for a light-emitting device having an initial transmittance of Equation 1 below and light / heat resistance of Equation 2 below.
[Formula 1]

[Equation 1]

[Equation 2]

In Chemical Formula 1, R ₁ and R ₄ to R ₇ are each independently selected from the group consisting of hydrogen, a hydroxy group, a halogen group, an alkyl group having 1 to 5 carbon atoms, and an alkoxy group having 1 to 5 carbon atoms, and R ₂ Is a linear, branched or cyclic hydrocarbon group having 4 to 10 carbon atoms, which may or may not contain any one or more of nitrogen and oxygen atoms, and R ₃ is

,

,

,

,

,

,

,

And

It is selected from the group consisting of, in the formulas 1 and 2, T ⁰ is the initial transmittance at the wavelength, T ¹ is the transmittance after light exposure at the wavelength. The method according to claim 1, wherein R ₁ of Formula 1 is an alkyl group having 1 to 5 carbon atoms, R ₂ is a phenyl group, cyano group, alkyl group, alkoxy group, carbonyl group, carboxyl group, hydroxy group, amide group, ester group, ether group, acrylate A saturated or unsaturated hydrocarbon group comprising at least one selected from the group consisting of a group and a halogen group, R ₄ to R ₇ is hydrogen, characterized in that the hydrogen absorbing material for ultraviolet light-emitting device. The method according to claim 1, R ₂ of Formula 1 is

,

,

,

,

,

,

,

,

,

And

Characterized in that it is selected from the group consisting of, UV absorbing encapsulant for a light emitting device. The method according to claim 1, wherein the indole derivative compound represented by the formula (1) is selected from the group consisting of compounds represented by the following formulas (1a to 1j) and isomers thereof, UV absorbing encapsulant for a light emitting device.
[Formula 1a]

[Formula 1b]

[Formula 1c]

[Formula 1d]

[Formula 1e]

[Formula 1f]

[Formula 1g]

[Formula 1h]

[Formula 1i]

[Formula 1j]

The method according to claim 1, The initial UV transmittance of the encapsulant is characterized in that 80 to 95% at a wavelength of 405 to 430 nm, UV absorbing encapsulant for a light emitting device. The method according to claim 1, Light-resistant transmittance and heat-resistant transmittance of the encapsulant is characterized in that less than 7%, UV-absorbing encapsulant for light-emitting elements. The method according to claim 1, wherein the encapsulant is a benzophenone-based compound, triazole-based compound, benzotriazole-based compound, triazine-based compound, salicylate-based compound, cyanoacrylate-based compound, oxanilide-based compound, hindered amine-based compound And a UV absorber selected from the group consisting of metal complex salt-based compounds. The method according to claim 1, The encapsulant is characterized in that it further comprises at least one additive selected from the group consisting of antioxidants, thermal stabilizers, surfactants, leveling agents and antifoaming agents, UV absorbing encapsulant for light-emitting elements. The method according to claim 1, The light emitting element is characterized in that the LED or OLED, UV absorbing encapsulant for a light emitting element. A light-emitting element comprising the ultraviolet absorbing encapsulant for a light-emitting element of claim 1.