KR101797283B1 - Composition for electro-luminescent device, electro-luminescent device comprising the same and method for preparing the same - Google Patents

Composition for electro-luminescent device, electro-luminescent device comprising the same and method for preparing the same Download PDF

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KR101797283B1
KR101797283B1 KR1020150121669A KR20150121669A KR101797283B1 KR 101797283 B1 KR101797283 B1 KR 101797283B1 KR 1020150121669 A KR1020150121669 A KR 1020150121669A KR 20150121669 A KR20150121669 A KR 20150121669A KR 101797283 B1 KR101797283 B1 KR 101797283B1
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layer
light emitting
composition
substrate
electroluminescent device
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KR20170025335A (en
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최병대
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재단법인대구경북과학기술원
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • H01L41/187—
    • H01L51/0008—
    • H01L51/0097—
    • H01L51/5012—
    • H01L51/5024—

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  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

TECHNICAL FIELD The present invention relates to a composition for an electroluminescent device, an electroluminescent device including the same, and a method of manufacturing the same. More specifically, the present invention relates to a composition for an electroluminescent device, And piezoelectric material; And an electroluminescent device including the composition and a method of manufacturing the same. The composition for an electroluminescent device of the present invention can provide an electroluminescent device having improved luminous efficiency by using an inverse piezoelectric effect.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for an electroluminescent device, an electroluminescent device including the electroluminescent device,

The present invention relates to a composition for an electroluminescent device that provides an inverse piezoelectric effect, an electroluminescent device including the same, and a method for manufacturing the same.

With the development of the internet of things (IOT) industry and the increasing demand for electronic devices, there is a growing demand for light emitting devices using flexible substrates such as electroluminescent devices emitting light with an applied AC electric field. The electroluminescent device can be applied to various fields such as interior lighting for a car, an interior lighting, a billboard, a large display, and a wearable lighting. In an electroluminescent device, efficiency of light emission compared to input energy is important, and research for maximizing light emission efficiency is underway.

For example, an electroluminescent device using a structure in which a light emitting layer is formed between conductive electrodes has been proposed. Such an electroluminescent device can be easily formed at room temperature and can be formed on a substrate of a vinyl type having a low melting point. However, the electroluminescent device has a disadvantage in that the luminous efficiency is low due to the simple structure of a light emitting body and an organic binder. Such an organic binder has a disadvantage in that the light emitting efficiency is generally low because of low dielectric constant capable of storing an applied electric field.

In addition, efficiency improvement can be expected by introducing a dielectric thin film or the like on the upper and lower sides of the light emitting layer, but an additional process requiring a complicated manufacturing process such as sputtering is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a composition for an electroluminescent device which can improve the luminous efficiency by using the inverse piezoelectric effect and simplify the process to lower the manufacturing cost of the electroluminescent device .

The present invention provides an electroluminescent device comprising the composition for electroluminescent devices.

The present invention provides a method of manufacturing the electroluminescent element.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a light emitting device comprising: a light emitting material; And piezoelectric material; And a composition for an electroluminescent device.

According to one embodiment of the present invention, with respect to 100 parts by weight of the composition, the light emitting material may include 20 to 90 parts by weight; And the piezoelectric material comprises 0.01 to 70 parts by weight; ≪ / RTI >

According to one embodiment of the present invention, the luminescent material has a particle diameter of 5 nm to 1 mm, and the piezoelectric material may have a particle diameter of 5 nm to less than 50 μm.

According to one embodiment of the present invention, the light-emitting material, ZnS, ZnO, CaS, SrS , Y 2 O 2, Y 2 O 2 S, Zn 2 SiO 4, Y 3 Al 5 O 12, Y 3 (AlGa) 5 O 12 , Y 2 SiO 5 , LaOCl, InBO 3 , Gd 2 O 2 S, and ZnGa 2 O 4 And the host may include at least one of Mn, Cu, Ag, Eu, Cl, I, Tb, Al, Ce, Er and Pr.

According to an embodiment of the present invention, the piezoelectric material may include at least one of SiO 2 , ZnO, ZnS, LiNbO 3 , LiTaO 3 , Li 2 B 4 O 7 , KNaC 4 H 4 O 6 , BaTiO 3 , Bi 4 Ti 3 O 12 , [Bi 4 - X La X ] Ti 3 O 12 (0 <x <1), SrTiO 3, PbTiO 3, PbZrO 3 (PZT), PZT-Pb (Zr, Ti) O 3, AlPO 4, GaPO 4, La 3 Ga 5 SiO 14, SnO 2, KNbO 3, Na 2 O 3 , Ba 2 NaNb 5 O 5 , Pb 2 KNb 5 O 15 , KNaNb 5 O 5 , BiFeO 3 , AlN, tourmaline, PVDF-TrFE (polyvinylidene fluoride- PVDF. &Lt; / RTI &gt;

According to an embodiment of the present invention, the electroluminescent device composition further comprises an alkyl acrylate series polyfunctional diluent having at least two functional groups, wherein the diluent is at least one selected from the group consisting of 2-ethylhexyl acrylate, Hydroxyethyl acrylate, hydroxyethyl acrylate, 3,5,6-trimethylhexyl acrylate, and isooctyl acrylate.

According to one embodiment of the present invention, the alkyl-based acrylate-based multifunctional diluent having at least two functional groups, relative to 100 parts by weight of the composition, is 1 part by weight to 80 parts by weight; &Lt; / RTI &gt;

According to another aspect of the present invention,

Board; A first electrode layer; And a second electrode layer; And an electroluminescent device including a light emitting layer including the composition according to the present invention between the first electrode layer and the second electrode layer.

According to one embodiment of the present invention, the substrate can be flexible, stretchable, or both.

According to an embodiment of the present invention, the substrate may be formed of a material selected from the group consisting of polycarbonate (PC), polyethyleneterephthalate (PET), polyestersulfonate, polyethylene naphthalate (PEN) polyimide, polyarylate, and texile. &lt; RTI ID = 0.0 &gt;

According to an embodiment of the present invention, the light emitting layer may have a thickness of 10 nm to 10 mm, and the light emitting layer may have a pattern shape.

According to an embodiment of the present invention, the first electrode layer, the second electrode layer, or both may be transparent electrodes.

According to an embodiment of the present invention, the second substrate may further include a second substrate.

According to yet another aspect of the present invention,

Preparing a substrate having flexibility, stretchability, or both; Forming a first electrode layer on the substrate; Forming a light emitting layer comprising the composition according to the present invention on at least a portion of the first electrode layer; And forming a second electrode layer on the light emitting layer; And a method of manufacturing the electroluminescent device.

According to an embodiment of the present invention, the step of forming the light emitting layer may include: applying a composition to at least a part of the one electrode layer; And curing the applied composition; Wherein the applying step uses vacuum deposition, screen printing, die coating, roll coating or spin coating, and the curing step can photo-cure the composition.

According to an embodiment of the present invention, the method may further include depositing a second substrate on the second electrode layer.

The present invention can provide a composition for an electroluminescent device which can uniformly disperse a piezoelectric material between light emitting materials and improve the luminous efficiency by using an inverse piezoelectric effect. The composition for an electroluminescent device can produce an electroluminescent film using a simple process, thereby contributing to cost reduction in a high-efficiency film-type electroluminescent device.

Fig. 1 illustrates an electroluminescent device according to an embodiment of the present invention.
Fig. 2 is an exemplary illustration of an electroluminescent device according to another embodiment of the present invention.
Fig. 3 exemplarily shows a process flow chart of a method of manufacturing an electroluminescent device, according to an embodiment of the present invention.
Fig. 4 exemplifies a process sectional view of a method of manufacturing an electroluminescent device, according to an embodiment of the present invention.
Fig. 5 exemplarily shows a process flow chart of a method of manufacturing an electroluminescent device according to another embodiment of the present invention.
Fig. 6 exemplarily shows a process sectional view of a method of manufacturing an electroluminescent device according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Also, terminologies used herein are terms used to properly represent preferred embodiments of the present invention, which may vary depending on the user, intent of the operator, or custom in the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification. Like reference symbols in the drawings denote like elements.

The present invention provides a composition for an electroluminescent device. The composition can incorporate a piezoelectric material capable of causing a change in pressure while maintaining a dielectric property, and can simultaneously induce light emission by an electric field and light emission by a piezoelectric material, thereby improving luminous efficiency.

According to an embodiment of the present invention, the composition may include a light emitting material and a piezoelectric material.

According to an embodiment of the present invention, the light emitting material is an inorganic and / or organic light emitting material that emits light by an applied electric field, and is preferably an inorganic light emitting material. Wherein the light emitting material is selected from the group consisting of ZnS, ZnO, CaS, SrS, Y 2 O 2 , Y 2 O 2 S, Zn 2 SiO 4 , Y 3 Al 5 O 12 , Y 3 (AlGa) 5 O 12 , Y 2 SiO 5 , LaOCl, InBO 3, Gd 2 O 2 S, and ZnGa 2 O 4 And ZnS and ZnO in order to increase the luminescence effect by electric field and pressure. For example, since ZnS and ZnO have their own piezoelectric characteristics and exhibit luminescence characteristics by modifying the bandgap by external pressure, they can be advantageous in obtaining a luminescence effect according to an inverse piezoelectric effect when mixed with a piezoelectric material. The host may include at least one active material selected from the group consisting of Mn, Cu, Ag, Eu, Cl, I, Tb, Al, Ce, Er and Pr. Cu; Ag; Eu; Pr; Pr, Al; Eu, Pr; Cu, Cl; Cu, Tb; Tb; Ag, Cl; Cl; Cu, Al; Ce; Er; And Er, Cl ;. More preferably, the light emitting material may be ZnS: Cu, ZnS: Mn, ZnS: Cl, ZnS: Al, ZnS: I, ZnO: Al, ZnO: Cu, ZnO: Mn and ZnO: Tb.

According to an embodiment of the present invention, the light emitting material may be included in an amount of 20 to 90 parts by weight, preferably 25 to 80 parts by weight, more preferably 30 to 30 parts by weight, Parts by weight to 50 parts by weight. When the light emitting material is contained in an amount of less than 20 parts by weight, it may be difficult to obtain a sufficient light emitting effect. If the light emitting material is more than 90 parts by weight, the light emitting materials may not be mixed well or the light emitting efficiency may be lowered.

According to one embodiment of the present invention, the particle diameter of the light emitting material may be 5 nm to 1 mm, preferably 5 nm to 200 m, and more preferably 5 nm to 100 m.

If the particle diameter of the light emitting material is less than 5 nm, the central wavelength of light emission may be changed. If the light emitting material has a particle diameter of more than 1 mm, the uniformity of inter-particle dispersion occurring during device fabrication may be deteriorated.

According to an embodiment of the present invention, when the piezoelectric material is homogeneously mixed with the composition, an inverse piezoelectric effect is induced in the light emission by the electric field, and the pressure generated by the inverse piezoelectric effect induces deformation of the light emitting material Additional light emission can be provided. The piezoelectric material is a material that provides a reverse piezoelectric phenomenon by causing a change in pressure while maintaining dielectric properties in the composition of the present invention, and may be an organic piezoelectric material and an inorganic piezoelectric material having dielectric properties, for example.

According to an embodiment of the present invention, the organic piezoelectric material is an organic material having a dielectric property, for example, vinylidene fluoride, TrFE, vinylidene cyanide vinylidene cyanide, vinyl chloride, chloroacrylonitrile, vinyl chloride, polymers thereof, or copolymers thereof, preferably at least one of polyvinylidene fluoride (PVDF), polyvinylidene fluoride TrFE (trifluoroethylene), or PVDF-TrFE (polyvinylidene fluoride-co-trifluoroethylene).

According to an embodiment of the present invention, the inorganic piezoelectric material includes at least one of a metal oxide, a metal nitride, a silica-based material having dielectric properties, or an alloy and a dielectric material thereof, and may be SiO 2 , ZnO, ZnS, LiNbO 3 , LiTaO 3 , Li 2 B 4 O 7 , KNaC 4 H 4 O 6 , BaTiO 3 , Bi 4 Ti 3 O 12 , [Bi 4 - X La X ] Ti 3 O 12 (0 <x <1), SrTiO 3, PbTiO 3, PbZrO 3 (PZT), PZT-Pb (Zr, Ti) O 3, AlPO 4, GaPO 4, La 3 Ga 5 SiO 14, SnO 2, KNbO 3, And may include at least one of Na 2 WO 3 , Ba 2 NaNb 5 O 5 , Pb 2 KNb 5 O 15 , KNaNb 5 O 5 , BiFeO 3 , AlN, and tourmaline (tourmaline) a ZnS, BaTiO 3, PbZrO 3 ( PZT), PZT-Pb (Zr, Ti) O 3.

According to one embodiment of the present invention, the piezoelectric material may be at least one of powder, gel, emulsion, liquid and fiber forms, and preferably it may be in powder form.

According to an embodiment of the present invention, the piezoelectric material may have a particle size of less than 5 nm to less than 50 탆. If the thickness is less than 5 nm, the effect of reverse piezoelectric effect is insignificant. If the thickness is more than 50 탆, Homogeneous mixing becomes difficult, and the effect of improving the luminous efficiency can not be obtained, which is not preferable.

According to an embodiment of the present invention, the piezoelectric material may be included in an amount of 0.01 to 70 parts by weight, preferably 10 to 70 parts by weight, more preferably 10 parts by weight, To 60 parts by weight. If the piezoelectric material is contained in an amount of less than 0.01 part by weight, the effect of reverse piezoelectric effect is insufficient, and if it exceeds 70 parts by weight, mixing with the light emitting material may not be performed well and the luminous efficiency may be lowered.

According to an embodiment of the present invention, the light emitting material and the piezoelectric material may be applied in a core-shell structure, and the core material may include a light emitting material, a piezoelectric material, or both, The shell layer may include a light emitting material, a piezoelectric material, or both. For example, the core-shell structure may be a form in which the piezoelectric material surrounds the luminescent material or a form in which the luminescent material surrounds the piezoelectric material.

According to one embodiment of the invention, the core has a particle size of less than 1 mm at 5 nm, and the thickness of the shell layer may be less than 1 mm at 5 nm.

According to one embodiment of the present invention, the composition according to the present invention may further include an alkyl acrylate-based multi-functional diluent having at least two functional groups, a photoinitiator and a crosslinking agent.

According to an embodiment of the present invention, the multifunctional diluent may be used for forming an insulating layer having the function of a binder of the composition. May be included in an amount of 1 part by weight to 80 parts by weight, more preferably 5 parts by weight to 80 parts by weight, based on 100 parts by weight of the composition. The polyfunctional diluent may include at least one of 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 3,5,5-trimethylhexyl acrylate, and isooctyl acrylate.

According to one embodiment of the present invention, the photoinitiator decomposes upon irradiation with light to generate an active radical, and the active radical can cause the composition to undergo a polymerization curing reaction. 1 to 50 parts by weight based on 100 parts by weight of the composition. The initiator may be a mixture of 50% by weight of 2-hydroxy-2-methyl-1-phenyl-propane-1one and 50% by weight of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2-dimethoxy 2-phenylacetophenone, and 4-dimethylaminopyridine.

According to one embodiment of the present invention, the crosslinking agent can crosslink the polymer chains of the polyfunctional diluent, and through such crosslinking can provide excellent mechanical strength and chemical stability of the composition. And 0.1 to 90 parts by weight based on 100 parts by weight of the composition. The crosslinking agent may include at least one of 1,6-hexanediol diacrylate, 1.6-hexanediol divinyl ether, and urethane acrylate.

According to one embodiment of the present invention, the composition according to the present invention may further comprise a residual solvent, and the solvent may be selected from the group consisting of methanol, ethanol, propanol, butanol, isopropanol, dimethylformamide, methyl ethyl ketone, And at least one of propylene glycol (mono) methyl ether (PGM), isopropyl cellulose (IPC), methylene chloride (MC), ethylene carbonate (EC), methyl cellosolve and ethyl cellosolve.

The present invention provides an electroluminescent device comprising the composition for an electroluminescent device according to the present invention. The electroluminescent device according to the present invention includes a substrate, a first electrode, a second electrode, and a light emitting layer, wherein the light emitting layer is formed between the first electrode and the second electrode, When it is applied, it emits light.

An electroluminescent device according to an embodiment of the present invention will be described with reference to FIG.

1A, an electroluminescent device 100 according to an embodiment of the present invention includes a substrate 110, a first electrode 110, a second electrode 110, An electrode 120, a light emitting layer 130, and a second electrode 140.

The substrate 110 is a transparent substrate applicable to an electroluminescent device, and may preferably be a transparent substrate having flexibility, stretchability, or both. The substrate 110 is a glass substrate, a plastic substrate, or a substrate to which both are bonded. For example, the plastic substrate may be a polycarbonate (PC), a polyethylene terephthalate (PET), a polyester sulfonate at least one film of polyestersulfonate, polyethylene naphthalate (PEN), polyimide (PI), polyarylate, and texile.

The substrate 110 has a thickness of 100 nm to 10 mm, preferably 20 [mu] m to 1 mm.

The first electrode 120 is a transparent electrode formed on the substrate 110 and may include a transparent conductive material. For example, the first electrode 120 may be formed of indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), indium cesium oxide (ICO), indium tungsten oxide And may include at least one transparent conductive material selected from the group consisting of zinc oxide (ZnO), polyethylenedioxythiophene (PEDOT), polystyrenesulfonate (PSS), polyaniline, and polythiophen.

The light emitting layer 130 is formed between the first electrode 120 and the second electrode 140, and may be formed on the first electrode 120. The light emitting layer 130 includes the composition for an electroluminescent device according to the present invention. When a voltage V is applied, the light emitting material of the light emitting layer 130 emits light to emit light.

According to one embodiment of the present invention, the light emitting layer 130 may be formed in a patterned shape, and the patterned shape may be appropriately selected according to the application field of the electroluminescent device, , Polygons, circles, stripes, etc., and various shapes or shapes may be arranged randomly or regularly. Preferably square and stripe shapes as shown in Fig. 1B. The light emitting layer 130 may have a thickness of 10 nm to 10 mm, preferably 10 nm to 5 mm, and when the thickness of the light emitting layer 130 is within the above range, excellent light emitting efficiency can be obtained.

Referring to FIG. 1C, the light emitting layer 130 may include a light emitting material and a piezoelectric material aligned in a lower direction in the curing process of the composition; Or a first layer (131) and a first layer (131) comprising a light-emitting material and a polyfunctional diluent acting as a bonding agent for bonding the piezoelectric material and the first layer (131); Or polyfunctional diluents and piezoelectric materials; And a second layer (132) comprising the second layer (132). Since the first layer 131 is cured in a state where the light emitting material and the piezoelectric material are uniformly dispersed, the uniformity of light emission can be enhanced and the light emitting efficiency can be improved by the reverse piezoelectric effect. In addition, since the interface height with the second layer 132 is constant over the entire bonding surface, a decrease in luminance can be prevented. The second layer 132 functions as an insulating layer because the multifunctional diluent is a main component, and is separated from the first layer 131 during application and / or curing of the composition for an EL device, Since it is not formed on the first layer 131 through a separate process, it can have an improved adhesion. In addition, since it exhibits excellent moisture resistance, the lifetime of the electroluminescent element can be increased.

The second electrode 140 is an opaque electrode formed on the light emitting layer 130 and may be formed of a metal such as aluminum (Al), silver (Ag), molybdenum (Mo), chromium (Cr), nickel (Ni) , Titanium (Ti), and tantalum (Ta). Accordingly, the electroluminescent element 100 can emit light in the direction in which the first electrode 120 is disposed.

1D illustrates an electroluminescent device 100 'according to an exemplary embodiment of the present invention. Referring to FIG. 1D, an electroluminescent device 100' includes a substrate 110 ' , A first electrode 120 ', a light emitting layer 130', and a second electrode 140 '.

The substrate 110 'and the light emitting layer 130' are the same as the substrate 110 and the light emitting layer 130 described in FIG. 1A.

Since the first electrode 120 'is an opaque electrode formed on the substrate 110' and the second electrode 140 'is a transparent electrode formed on the light emitting layer 130', the electroluminescent device 100 ' Emits light in the direction of the second electrode 140 '. The transparent electrode and the opaque electrode may contain components as mentioned in Fig.

1E illustrates an electroluminescent device 100 '' in accordance with an embodiment of the present invention. Referring to FIG. 1E, an electroluminescent device 100 '' includes a substrate 110 ', A first electrode 120' ', a light emitting layer 130' ', and a second electrode 140' '.

The substrate 110 '', the first electrode 120 '', and the light emitting layer 130 '' are the same as the substrate 110, the first electrode 120, and the light emitting layer 130 described in FIG.

Since the second electrode 140 '' is a transparent electrode formed on the light emitting layer 130 '', the electroluminescent element 100 '' can emit bi-directional light. The transparent electrode may include a component as mentioned in Fig.

In accordance with another embodiment of the present invention, an electroluminescent device according to the present invention will be described with reference to FIG. 2, the electroluminescent device 200 includes a first substrate 210, a first electrode 220, a light emitting layer 230, a second electrode 220, (240) and a second substrate (250).

The first substrate 210, the first electrode 220, the light emitting layer 230, and the second electrode 240 may include components and configurations as described with reference to FIGS. 1A through 1E.

The second substrate 250 may be formed on the second electrode 240 to protect the second electrode 240. The second substrate 250 may be formed of a substrate having the same or different components as the first electrode 220.

The present invention provides a method for manufacturing an electroluminescent device including the composition for an electroluminescent device according to the present invention.

A method of manufacturing an electroluminescent device according to an embodiment of the present invention will be described with reference to FIG. FIG. 3 is a flowchart illustrating a method of manufacturing an electroluminescent device according to an embodiment of the present invention. The manufacturing method includes a step S1 of preparing a substrate, a step S2 of forming a first electrode layer, , Forming a light emitting layer (S3), and forming a second electrode layer (S4).

Referring to FIG. 4A, FIG. 4A is a process sectional view of a method of manufacturing an electroluminescent device. Referring to FIG. 4A, step S1 of preparing a substrate is applied to an electroluminescent device The substrate 310 is prepared as described above with reference to FIG.

The step S2 of forming the first electrode layer is a step of forming the first electrode 320 on at least a part of the substrate 310. [ The first electrode 320 is a transparent electrode, as described in FIG. Step S2 may be vacuum deposition, screen printing, die coating, spin coating, or the like.

The step S3 of forming the light emitting layer is a step of forming the light emitting layer 330 on at least a part of the first electrode 320. [ Step S3 may include applying S3a, laminating the release film S3b, curing S3c, and removing the release film S3d.

The applying step S3a is a step of applying the composition 330 for an electroluminescent device according to the present invention to at least a part of the first electrode 320. [ The application may be performed by vacuum deposition, screen printing, die coating, spin coating, or the like.

The step of laminating the release film (S3b) is a step of laminating the release film (10) on at least a part of the applied composition (330) after the application step (S3a). The release film 10 may be made of a transparent material having a peeling force. In addition, the release film 10 may be a surface-treated surface bonded to the applied composition 330 for ease of peeling.

The curing step S3c is a step of curing UV light onto the composition 330 applied through the release film 10. The curing may be performed for 1 second to 1 hour.

The step S3c in which the luminous material and the piezoelectric material contained in the applied composition 330 are aligned down and / or cured down through the step S3a and the step S3b before the curing step S3c, . &Lt; / RTI &gt; In FIG. 4A, the first layer 331 and the second layer 332 are separately displayed in the curing step S3c. However, the present invention is not limited thereto. The light emitting material and the piezoelectric material may sink into a form having a uniform dispersion in the coated composition 330. [ Thus, the light emitting material and the piezoelectric material are positioned at a uniform thickness in the lower layer (first layer 331) of the applied composition 330, and the multi-functional diluent can be mainly located in the upper layer (second layer 332) . In addition, at least a portion of the multifunctional diluent may be present in the lower layer 331 as a coupling agent of the luminescent material and the piezoelectric material, and at least a portion of the luminescent material and / or the piezoelectric material may be present in the upper layer 332 together with the polyfunctional diluent .

Therefore, when the UV light applied composition 330 is irradiated in the curing step S3c, the applied composition 330 causes a polymerization curing reaction, and the first layer 331 as a lower layer and the second layer 332 &lt; / RTI &gt;

The step of removing the release film (S3d) is a step of removing the release film (10) after the curing step (S3c).

The step S4 of forming the second electrode layer is a step of forming the second electrode 340 on at least a part of the light emitting layer 320. [ The second electrode 340 is an opaque electrode, as described in Fig. Step S4 may be vacuum deposition, screen printing, die coating, spin coating, or the like.

Referring to FIG. 4B, FIG. 4B is a process sectional view of a method of manufacturing an electroluminescent device according to an embodiment of the present invention. In FIG. 4B, a step S1 of preparing a substrate and a step of forming a light- S3 are the same as those in Fig. 4A.

The step S2 of forming the first electrode layer is a step of forming the first electrode 320 on at least a part of the substrate 310. [ The first electrode 320 is an opaque electrode, as described in FIG. Step S2 may be vacuum deposition, screen printing, die coating, spin coating, or the like.

The step S4 of forming the second electrode layer is a step of forming the second electrode 340 on at least a part of the light emitting layer 330. [ The second electrode 340 is a transparent electrode, as described in FIG. Step S4 may be vacuum deposition, screen printing, die coating, spin coating, or the like.

Referring to FIG. 4C, FIG. 4C illustrates a process sectional view of a method of manufacturing an electroluminescent device. Referring to FIG. 4C, a step S1 of preparing a substrate, a step of forming a first electrode layer Step S2 and step S3 of forming a light emitting layer are the same as in Fig. 4A.

The step S4 of forming the second electrode layer is a step of forming the second electrode 340 on at least a part of the light emitting layer 330. [ The second electrode 340 is a transparent electrode, as described in FIG. Step S4 may be vacuum deposition, screen printing, die coating, spin coating, or the like.

A method of manufacturing an electroluminescent device according to another embodiment of the present invention will be described with reference to FIG. 5 is a flowchart illustrating a method of manufacturing an electroluminescent device. In FIG. 5, a method of manufacturing an electroluminescent device includes a step S1 of preparing a first substrate, a step of forming a first electrode layer S2, forming a light emitting layer S3, forming a second electrode layer S4, and stacking a second substrate S5.

6, there is shown a process sectional view of a method for manufacturing an electroluminescent device according to another embodiment of the present invention. In FIG. 6, a first substrate is prepared (S1), a first electrode layer Forming a light emitting layer (S3), and forming a second electrode layer (S4) are as described in FIG.

The step S5 of laminating the second substrate is a step of laminating the second substrate 350 on the second electrode layer and the second substrate 350 is an opaque or transparent substrate and is the same as the first substrate layer May be composed of different components. The substrate is as mentioned in Fig.

The present invention is not limited thereto but may be embodied in other specific forms without departing from the spirit or scope of the present invention as set forth in the following claims, The present invention can be variously modified and changed.

Example  1 to 7

The components were compounded and kneaded according to the composition shown in Table 1 to prepare a composition.

Particle size Example Comparative Example One 2 3 4 5 6 7 One 2 3 ZnS (Mn, Cu) 5 nm ~ 80 um 40 40 40 40 50 50 27 17 40 40 PZT 5 nm to 100 nm 10 100 nm ~ 1um 10 1 μm to less than 50 μm 10 50 μM to 100 μM 10 BaTiO3 5 nm to 100 nm 10 100 nm ~ 1um 10 70 80 1 μm to less than 50 μm 10 Multifunctional diluent 18 18 18 18 18 18 One One 18 28 Photoinitiator 2 2 2 2 2 2 One One 2 2 Cross-linking agent 30 30 30 30 20 20 One One 30 30

Explanation of the ingredients used in Table 1

(1) ZnS (Mn, Cu): GGS62, Osram Sylvania

(2) lead zirconate titanate (PZT): Sigma-Aldrich

(3) BaTiO 3 : Sigma Aldrich

(4) Multifunctional diluent: HEA (2-Hydroxyethyl acrylate), CYTEC

(5) Photoinitiator: DMAP (4-Dimethylaminopyridine), CYTEC

(6) Crosslinking agent: urethane acrylate, CYTEC

Comparative Example  1 to 3

The components were compounded and kneaded according to the composition shown in Table 1 to prepare a composition.

Experimental Example

(1 mm in thickness) by irradiating the substrate with a UV lamp (365 nm, 10 mw / cm 2 ) for 10 minutes after spin-coating the composition prepared in Example and Comparative Example on a substrate (Corning Eagle Glass 0.7 mm) Respectively.

Table 2 shows the electroluminescent characteristics (180 VAC, 10 kHz) of the prepared light emitting layer.

Example Comparative Example One 2 3 4 5 6 7 One 2 3 Luminescence intensity
(cd / m 2 ) 100 80 90 120 90
90
40
20
30
25

As can be seen from Table 2, the emission wavelength of 502 nm by ZnS (Mn, Cu) can be confirmed, and it can be seen that the embodiment including the piezoelectric material has increased luminescence intensity as compared with Comparative Example 3 which does not include the piezoelectric material have. Further, it can be confirmed that the luminescence intensity decreases when the content of the piezoelectric substance exceeds 70 wt%.

The present invention can provide an electroluminescent device with improved luminous efficiency by applying a composition comprising a piezoelectric material and a light emitting material to induce an inverse piezoelectric effect in an applied electric field.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI &gt; or equivalents, even if it is replaced or replaced. Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100, 100 ', 100 &quot;, 200: electroluminescent element
110, 110 ', 110'', 210, 310:
120, 120 ', 120 &quot;, 220, 320:
130, 130 ', 130'', 230, 330:
140, 140 ', 140'', 240, 340:
250, 350: second substrate

Claims (16)

Luminescent material; And
Piezoelectric material;
/ RTI &gt;
With respect to 100 parts by weight of the composition,
The light emitting material may include 20 to 90 parts by weight; And
Wherein the piezoelectric material comprises 0.01 to 70 parts by weight; Respectively,
Further comprising an alkyl-based acrylate-based multi-functional diluent having at least two functional groups,
Wherein the diluent comprises at least one of 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 3,5,5-trimethylhexyl acrylate and isooctyl acrylate,
Based on 100 parts by weight of the composition, the alkyl-based acrylate-based multi-functional diluent having at least two functional groups is 1 part by weight to 80 parts by weight; &Lt; / RTI &gt;
A composition for a light emitting layer of an electroluminescent device.
delete The method according to claim 1,
The light emitting material has a particle diameter of 5 nm to 1 mm,
Wherein the piezoelectric material has a particle diameter of 5 nm to less than 100 nm.
The method according to claim 1,
Wherein the light emitting material is selected from the group consisting of ZnS, ZnO, CaS, SrS, Y 2 O 2 , Y 2 O 2 S, Zn 2 SiO 4 , Y 3 Al 5 O 12 , Y 3 (AlGa) 5 O 12 , Y 2 SiO 5 , LaOCl, InBO 3, Gd 2 O 2 S, and ZnGa 2 O 4 containing at least one of the host, and the host, Mn, Cu, Ag, Eu, Cl, I, Tb, Al, Ce, Er, and Pr Wherein at least one of the active substances is contained in the composition.
The method according to claim 1,
The piezoelectric material, SiO 2, ZnO, ZnS, LiNbO 3, LiTaO 3, Li 2 B 4 O 7, KNaC 4 H 4 O 6, BaTiO 3, Bi 4 Ti 3 O 12, [Bi 4 - X La X] Ti 3 O 12 (0 <x <1), SrTiO 3, PbTiO 3, PbZrO 3 (PZT), PZT-Pb (Zr, Ti) O 3, AlPO 4, GaPO 4, La 3 Ga 5 SiO 14, SnO 2 , KNbO 3, Na 2 WO 3 , Ba 2 NaNb 5 O 5, Pb 2 KNb 5 O 15, KNaNb 5 O 5, BiFeO 3, AlN, tourmaline (tourmaline, tourmaline), PVDF-TrFE (poly ( vinylidene fluoride-co -trifluoroethylene), and PVDF. The composition for a light-emitting layer of an electroluminescent device is not particularly limited.
delete delete Board; A first electrode layer; And a second electrode layer; / RTI &gt;
A light emitting layer comprising the composition of any one of claims 1 to 5 between the first electrode layer and the second electrode layer,
The light emitting layer may include a first layer including a light emitting material, a piezoelectric material, and a polyfunctional diluent; And a second layer comprising a multi-functional diluent on the first layer; / RTI &gt;
Wherein the second layer further comprises a piezoelectric material,
Wherein the second layer is separated from the first layer during application or curing of the composition.
An electroluminescent device.
9. The method of claim 8,
Wherein the substrate is flexible, stretchable, or both.
9. The method of claim 8,
The substrate may be formed of a material selected from the group consisting of polycarbonate (PC), polyethyleneterephthalate (PET), polyestersulfonate, polyethylene naphthalate (PEN), polyimide, polyarylate ), And a fabric (texile).
9. The method of claim 8,
The light emitting layer is 10 nm to 10 mm thick,
Wherein the light emitting layer has a pattern shape.
9. The method of claim 8,
Wherein the first electrode layer, the second electrode layer, or both are transparent electrodes.
9. The method of claim 8,
And a second substrate on the second electrode layer.
Preparing a substrate having flexibility, stretchability, or both;
Forming a first electrode layer on the substrate;
Forming a light emitting layer comprising at least a part of the composition on the first electrode layer according to any one of claims 1 to 5; And
Forming a second electrode layer on the light emitting layer;
Lt; / RTI &gt;
The light emitting layer may include a first layer including a light emitting material, a piezoelectric material, and a polyfunctional diluent; And a second layer comprising a multi-functional diluent on the first layer; / RTI &gt;
Wherein the second layer further comprises a piezoelectric material,
Wherein the second layer is separated from the first layer during application or curing of the composition.
A method of manufacturing an electroluminescent device.
15. The method of claim 14,
The forming of the light emitting layer may include:
Applying a composition to at least a portion of the first electrode layer; And
And curing the applied composition,
The step of applying may be performed by vacuum deposition, screen printing, die coating or spin coating,
Wherein the curing step comprises photo-curing the composition.
15. The method of claim 14,
And laminating a second substrate on the second electrode layer.
KR1020150121669A 2015-08-28 2015-08-28 Composition for electro-luminescent device, electro-luminescent device comprising the same and method for preparing the same KR101797283B1 (en)

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CN108444965A (en) * 2018-03-20 2018-08-24 哈尔滨工业大学 The method of fluorescence spectrum method for measuring piezoelectric material structural phase transition
KR102147235B1 (en) 2018-05-18 2020-08-24 연세대학교 산학협력단 Heteroaryl compound exhibiting luminescent, ferroelectric and piezoelectric properties, and electronic device containing the same
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